昨天老师让帮忙给服务器装个mysql，本以为几行命令的事情，没想到配的汗流浃背，记一下遇到的问题

mysql安装

🫡指令介绍

sudo apt-get update && sudo apt-get install mysql-server

sudo apt-get update 从服务器获取软件列表，并在本地保存为文件

在linux中，安装软件最常用到的是 sudo apt-get ，这个命令会从软件仓库中检索并拉取我们想要的软件。每个linux的发行版，都会维护自己的软件仓库。常用的软件都在仓库中，有固定的维护，保证软件的发行源绝对的安全。

sudo apt-get update会读取软件仓库的所有源列表，然后保存在本机。方便本机用户检索、对比。相当于刷新本地的软件列表，用户安装软件时，会直接从本地的源列表中，检索出 URL，进行安装。

sudo apt-get install mysql-server 从刚刚更新的列表中找到mysql并安装

apt与apt-get的区别

😥执行 sudo apt-get update

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忽略:209 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse Translation-en
忽略:210 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse amd64 DEP-11 Metadata
忽略:211 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse DEP-11 64x64 Icons
忽略:138 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main amd64 Packages
忽略:139 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main i386 Packages
忽略:12 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main all Packages
忽略:140 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-zh_CN
忽略:14 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-zh
忽略:141 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-en
忽略:142 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main amd64 DEP-11 Metadata
忽略:143 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main DEP-11 64x64 Icons
忽略:144 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted amd64 Packages
忽略:145 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted i386 Packages
忽略:20 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted all Packages
忽略:146 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted Translation-zh_CN
忽略:22 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted Translation-zh
忽略:147 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted Translation-en
忽略:148 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted amd64 DEP-11 Metadata
忽略:25 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted DEP-11 64x64 Icons
忽略:149 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe amd64 Packages
忽略:150 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe i386 Packages
忽略:28 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe all Packages
忽略:151 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe Translation-zh_CN
忽略:30 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe Translation-zh
忽略:152 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe Translation-en
忽略:153 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe amd64 DEP-11 Metadata
忽略:154 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/universe DEP-11 64x64 Icons
忽略:155 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse amd64 Packages
忽略:156 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse i386 Packages
忽略:36 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse all Packages
忽略:157 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse Translation-zh_CN
忽略:38 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse Translation-zh
忽略:158 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse Translation-en
忽略:159 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse amd64 DEP-11 Metadata
忽略:160 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/multiverse DEP-11 64x64 Icons
忽略:161 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main amd64 Packages
忽略:162 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main i386 Packages
忽略:44 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main all Packages
忽略:45 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main Translation-zh_CN
忽略:46 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main Translation-zh
忽略:163 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main Translation-en
忽略:164 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main amd64 DEP-11 Metadata
忽略:165 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main DEP-11 64x64 Icons
忽略:166 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted amd64 Packages
忽略:167 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted i386 Packages
忽略:52 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted all Packages
忽略:53 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted Translation-zh_CN
忽略:54 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted Translation-zh
忽略:168 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted Translation-en
忽略:169 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted amd64 DEP-11 Metadata
忽略:57 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted DEP-11 64x64 Icons
忽略:170 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe amd64 Packages
忽略:171 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe i386 Packages
忽略:60 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe all Packages
忽略:61 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe Translation-zh_CN
忽略:62 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe Translation-zh
忽略:172 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe Translation-en
忽略:173 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe amd64 DEP-11 Metadata
忽略:174 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe DEP-11 64x64 Icons
忽略:175 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse amd64 Packages
忽略:176 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse i386 Packages
忽略:68 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse all Packages
忽略:69 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse Translation-zh_CN
忽略:70 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse Translation-zh
忽略:177 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse Translation-en
忽略:178 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata
忽略:179 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/multiverse DEP-11 64x64 Icons
忽略:180 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main amd64 Packages
忽略:181 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main i386 Packages
忽略:76 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main all Packages
忽略:77 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main Translation-zh_CN
忽略:78 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main Translation-zh
忽略:182 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main Translation-en
忽略:183 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main amd64 DEP-11 Metadata
忽略:184 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/main DEP-11 64x64 Icons
错误:82 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted amd64 Packages
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
忽略:83 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted i386 Packages
忽略:84 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted all Packages
忽略:85 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted Translation-zh_CN
忽略:86 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted Translation-zh
忽略:87 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted Translation-en
忽略:185 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted amd64 DEP-11 Metadata
忽略:89 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/restricted DEP-11 64x64 Icons
忽略:186 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/universe amd64 Packages
忽略:187 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/universe i386 Packages
忽略:92 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports/universe all Packages
忽略:193 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main amd64 Packages
忽略:194 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main i386 Packages
忽略:108 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main all Packages
忽略:109 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main Translation-zh_CN
忽略:110 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main Translation-zh
忽略:195 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main Translation-en
忽略:196 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main amd64 DEP-11 Metadata
忽略:197 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main DEP-11 64x64 Icons
忽略:198 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted amd64 Packages
忽略:199 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted i386 Packages
忽略:116 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted all Packages
忽略:117 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted Translation-zh_CN
忽略:118 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted Translation-zh
忽略:200 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted Translation-en
忽略:201 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted amd64 DEP-11 Metadata
忽略:121 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted DEP-11 64x64 Icons
忽略:202 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe amd64 Packages
忽略:203 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe i386 Packages
忽略:124 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe all Packages
忽略:125 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe Translation-zh_CN
忽略:126 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe Translation-zh
忽略:204 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe Translation-en
忽略:205 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe amd64 DEP-11 Metadata
忽略:206 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe DEP-11 64x64 Icons
忽略:207 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse amd64 Packages
忽略:208 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse i386 Packages
忽略:132 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse all Packages
忽略:133 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse Translation-zh_CN
忽略:134 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse Translation-zh
忽略:209 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse Translation-en
忽略:210 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse amd64 DEP-11 Metadata
忽略:211 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse DEP-11 64x64 Icons
错误:138 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main amd64 Packages
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
忽略:139 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main i386 Packages
忽略:140 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-zh_CN
忽略:141 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-en
忽略:142 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main amd64 DEP-11 Metadata
忽略:143 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main DEP-11 64x64 Icons
忽略:144 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted amd64 Packages
忽略:145 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted i386 Packages
忽略:146 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted Translation-zh_CN
忽略:147 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted Translation-en
忽略:148 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/restricted amd64 DEP-11 Metadata
错误:161 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main amd64 Packages
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
忽略:162 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main i386 Packages
忽略:163 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main Translation-en
忽略:164 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main amd64 DEP-11 Metadata
忽略:165 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/main DEP-11 64x64 Icons
忽略:166 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted amd64 Packages
忽略:167 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted i386 Packages
忽略:168 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted Translation-en
忽略:169 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/restricted amd64 DEP-11 Metadata
忽略:170 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe amd64 Packages
忽略:171 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates/universe i386 Packages
错误:193 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main amd64 Packages
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
忽略:194 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main i386 Packages
忽略:195 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main Translation-en
忽略:196 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main amd64 DEP-11 Metadata
忽略:197 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/main DEP-11 64x64 Icons
忽略:198 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted amd64 Packages
忽略:199 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted i386 Packages
忽略:200 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted Translation-en
忽略:201 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/restricted amd64 DEP-11 Metadata
忽略:202 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe amd64 Packages
忽略:203 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/universe i386 Packages
已下载 66.2 kB，耗时 2分 31秒 (437 B/s)
正在读取软件包列表... 完成
W: 仓库 “https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
W: 仓库 “https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security Release” 没有 Release 文件。
N: 无法认证来自该源的数据，所以使用它会带来潜在风险。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。
E: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-backports/restricted/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial/main/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-updates/main/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-security/main/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。

原因分析

lsb_release -a 查看服务器版本

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.6 LTS
Release:	16.04
Codename:	xenial

从用户文件分析该服务器使用了桌面系统

apt功能无法使用，输入sudo apt-get update指令总是显示忽略所有文件

问题本质-源的问题

最开始我以为是此ubuntu系统的原因，于是我在另一台电脑上重装了一个新的ubuntu系统，使用系统默认源进行apt,此时功能是正常的。然后我换成清华的源就又出现上述问题了，然后我又把源改成系统的源就又功能正常了。而且我将系统最初始的source.list文件(里面包含系统最初的使用源)拷贝出来，将之前的ubuntu中的source.list中的信息更改为我拷贝出来源信息，然后之前的ubuntu中的apt功能就正常运行了。所以得出结论，由于源的问题导致apt功能无法使用，我之前使用的是清华镜像源，但我之前用的好好的，现在不知道为什么用不了了。

问题解决

1.清空/var/lib/apt/lists下所有文件

sudo rm -rf /var/lib/apt/lists/*

2.备份source.list

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

3.写入新源

#vim /etc/apt/sources.list
#以下源任选
 
#sohu shangdong
deb http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse
 
#163 guangdong
deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
 
#aliyun
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
 
 
#tsinghua.edu 肯定不可以使用这个源了
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse
 
#neu.edu
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial main restricted #Added by software-properties
deb http://mirror.neu.edu.cn/ubuntu/ xenial main restricted
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial restricted multiverse universe #Added by software-properties
deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates main restricted
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-updates main restricted multiverse universe
deb http://mirror.neu.edu.cn/ubuntu/ xenial universe
deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates universe
deb http://mirror.neu.edu.cn/ubuntu/ xenial multiverse
deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates multiverse
deb http://mirror.neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted
deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted multiverse universe
deb http://mirror.neu.edu.cn/ubuntu/ xenial-security universe
deb http://mirror.neu.edu.cn/ubuntu/ xenial-security multiverse

4.重新执行sudo apt-get update ，大功告成！😁

获取:1 http://mirrors.aliyun.com/ubuntu xenial InRelease [247 kB]
获取:2 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease [99.8 kB]
获取:3 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease [97.4 kB]      
获取:4 http://mirrors.aliyun.com/ubuntu xenial-security InRelease [99.8 kB]       
获取:5 http://mirrors.aliyun.com/ubuntu xenial/main Sources [868 kB]               
获取:6 https://download.docker.com/linux/ubuntu xenial InRelease [66.2 kB]      
获取:7 http://mirrors.aliyun.com/ubuntu xenial/restricted Sources [4,808 B]                                
获取:8 http://archive.ubuntu.com/ubuntu xenial InRelease [247 kB]                                          
获取:9 http://mirrors.aliyun.com/ubuntu xenial/multiverse Sources [179 kB]                                 
获取:10 http://mirrors.aliyun.com/ubuntu xenial/universe Sources [7,728 kB]                                
获取:11 https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages [21.0 kB]                    
获取:12 http://mirrors.aliyun.com/ubuntu xenial/main amd64 Packages [1,201 kB]                             
获取:13 http://mirrors.aliyun.com/ubuntu xenial/main i386 Packages [1,196 kB]                              
获取:14 http://archive.canonical.com/ubuntu xenial InRelease [11.5 kB]                                     
获取:15 http://mirrors.aliyun.com/ubuntu xenial/main Translation-zh_CN [74.8 kB]                           
获取:16 http://mirrors.aliyun.com/ubuntu xenial/main Translation-en [568 kB]                               
获取:17 http://mirrors.aliyun.com/ubuntu xenial/main amd64 DEP-11 Metadata [733 kB]                        
获取:18 http://mirrors.aliyun.com/ubuntu xenial/main DEP-11 64x64 Icons [409 kB]                           
获取:19 http://archive.canonical.com/ubuntu xenial/partner Sources [2,300 B]                           
获取:20 http://mirrors.aliyun.com/ubuntu xenial/restricted amd64 Packages [8,344 B]                       
获取:21 http://mirrors.aliyun.com/ubuntu xenial/restricted i386 Packages [8,684 B]                        
获取:22 http://mirrors.aliyun.com/ubuntu xenial/restricted Translation-zh_CN [1,652 B]           
获取:23 http://archive.canonical.com/ubuntu xenial/partner amd64 Packages [2,696 B]                        
获取:24 http://archive.canonical.com/ubuntu xenial/partner i386 Packages [2,696 B]                    
获取:25 http://archive.canonical.com/ubuntu xenial/partner Translation-en [1,556 B]                   
获取:26 http://mirrors.aliyun.com/ubuntu xenial/restricted Translation-en [2,908 B]                        
获取:27 http://mirrors.aliyun.com/ubuntu xenial/restricted amd64 DEP-11 Metadata [186 B]
获取:28 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 Packages [7,532 kB]    
获取:29 http://archive.ubuntu.com/ubuntu xenial/main Sources [868 kB]            
获取:30 http://mirrors.aliyun.com/ubuntu xenial/universe i386 Packages [7,512 kB]             
获取:31 http://mirrors.aliyun.com/ubuntu xenial/universe Translation-zh_CN [172 kB]                    
获取:32 http://mirrors.aliyun.com/ubuntu xenial/universe Translation-en [4,354 kB]                        
获取:33 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 DEP-11 Metadata [3,410 kB]                
获取:34 http://mirrors.aliyun.com/ubuntu xenial/universe DEP-11 64x64 Icons [7,448 kB]              
获取:35 http://mirrors.aliyun.com/ubuntu xenial/multiverse amd64 Packages [144 kB]             
获取:36 http://mirrors.aliyun.com/ubuntu xenial/multiverse i386 Packages [140 kB]         
获取:37 http://mirrors.aliyun.com/ubuntu xenial/multiverse Translation-zh_CN [4,984 B]    
获取:38 http://mirrors.aliyun.com/ubuntu xenial/multiverse Translation-en [106 kB]          
获取:39 http://mirrors.aliyun.com/ubuntu xenial/multiverse amd64 DEP-11 Metadata [63.8 kB]
获取:40 http://mirrors.aliyun.com/ubuntu xenial/multiverse DEP-11 64x64 Icons [230 kB]    
获取:41 http://archive.ubuntu.com/ubuntu xenial/restricted Sources [4,808 B]       
获取:42 http://mirrors.aliyun.com/ubuntu xenial-updates/main Sources [537 kB]     
获取:43 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted Sources [3,608 B]
获取:44 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse Sources [12.3 kB]
获取:45 http://mirrors.aliyun.com/ubuntu xenial-updates/universe Sources [445 kB]
获取:46 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 Packages [1,267 kB]
获取:47 http://mirrors.aliyun.com/ubuntu xenial-updates/main i386 Packages [1,018 kB]
获取:48 http://mirrors.aliyun.com/ubuntu xenial-updates/main Translation-en [303 kB]
获取:49 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [326 kB]
获取:50 http://mirrors.aliyun.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [258 kB]
获取:51 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted amd64 Packages [10.2 kB]                
获取:52 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted i386 Packages [10.2 kB]                 
获取:53 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted Translation-en [2,272 B]                
获取:54 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted amd64 DEP-11 Metadata [157 B]           
获取:55 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 Packages [1,171 kB]                 
获取:56 http://mirrors.aliyun.com/ubuntu xenial-updates/universe i386 Packages [1,084 kB]                  
获取:57 http://mirrors.aliyun.com/ubuntu xenial-updates/universe Translation-en [334 kB]                   
获取:58 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [280 kB]            
获取:59 http://mirrors.aliyun.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [442 kB]               
获取:60 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse amd64 Packages [21.6 kB]                
获取:61 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse i386 Packages [20.4 kB]                 
获取:62 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse Translation-en [8,440 B]                
获取:63 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [5,980 B]         
获取:64 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse DEP-11 64x64 Icons [18.3 kB]            
获取:65 http://mirrors.aliyun.com/ubuntu xenial-backports/main Sources [6,732 B]                           
获取:66 http://mirrors.aliyun.com/ubuntu xenial-backports/universe Sources [11.0 kB]                       
获取:67 http://mirrors.aliyun.com/ubuntu xenial-backports/main amd64 Packages [10.2 kB]                    
获取:68 http://mirrors.aliyun.com/ubuntu xenial-backports/main i386 Packages [10.1 kB]                     
获取:69 http://mirrors.aliyun.com/ubuntu xenial-backports/main Translation-en [4,456 B]                    
获取:70 http://mirrors.aliyun.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,328 B]             
获取:71 http://mirrors.aliyun.com/ubuntu xenial-backports/main DEP-11 64x64 Icons [29 B]                   
获取:72 http://mirrors.aliyun.com/ubuntu xenial-backports/restricted amd64 DEP-11 Metadata [194 B]         
获取:73 http://mirrors.aliyun.com/ubuntu xenial-backports/universe amd64 Packages [11.5 kB]                
获取:74 http://mirrors.aliyun.com/ubuntu xenial-backports/universe i386 Packages [11.1 kB]                 
获取:75 http://mirrors.aliyun.com/ubuntu xenial-backports/universe Translation-en [4,476 B]                
获取:76 http://mirrors.aliyun.com/ubuntu xenial-backports/universe amd64 DEP-11 Metadata [6,604 B]         
获取:77 http://mirrors.aliyun.com/ubuntu xenial-backports/universe DEP-11 64x64 Icons [5,608 B]            
获取:78 http://mirrors.aliyun.com/ubuntu xenial-backports/multiverse amd64 DEP-11 Metadata [216 B]         
获取:79 http://mirrors.aliyun.com/ubuntu xenial-backports/multiverse DEP-11 64x64 Icons [29 B]             
获取:80 http://mirrors.aliyun.com/ubuntu xenial-security/main Sources [252 kB]                             
获取:81 http://mirrors.aliyun.com/ubuntu xenial-security/restricted Sources [2,976 B]                      
获取:82 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse Sources [4,636 B]                      
获取:83 http://mirrors.aliyun.com/ubuntu xenial-security/universe Sources [211 kB]                         
获取:84 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages [913 kB]                      
获取:85 http://mirrors.aliyun.com/ubuntu xenial-security/main i386 Packages [682 kB]                       
获取:86 http://mirrors.aliyun.com/ubuntu xenial-security/main Translation-en [211 kB]                      
获取:87 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [93.7 kB]              
获取:88 http://mirrors.aliyun.com/ubuntu xenial-security/main DEP-11 64x64 Icons [116 kB]                  
获取:89 http://mirrors.aliyun.com/ubuntu xenial-security/restricted amd64 Packages [9,824 B]               
获取:90 http://mirrors.aliyun.com/ubuntu xenial-security/restricted i386 Packages [9,800 B]                
获取:91 http://mirrors.aliyun.com/ubuntu xenial-security/restricted Translation-en [2,152 B]               
获取:92 http://mirrors.aliyun.com/ubuntu xenial-security/restricted amd64 DEP-11 Metadata [200 B]          
获取:93 http://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 Packages [741 kB]                  
获取:94 http://mirrors.aliyun.com/ubuntu xenial-security/universe i386 Packages [660 kB]                   
获取:95 http://mirrors.aliyun.com/ubuntu xenial-security/universe Translation-en [203 kB]                  
获取:96 http://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [130 kB]           
获取:97 http://mirrors.aliyun.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [206 kB]              
获取:98 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse amd64 Packages [7,864 B]               
获取:99 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse i386 Packages [8,084 B]                
获取:100 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse Translation-en [2,672 B]              
获取:101 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse amd64 DEP-11 Metadata [2,460 B]       
获取:102 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse DEP-11 64x64 Icons [2,638 B]          
已下载 58.0 MB，耗时 11秒 (5,076 kB/s)                                                                     
AppStream cache update completed, but some metadata was ignored due to errors.
正在读取软件包列表... 完成

🎉执行 sudo apt-get install mysql-server

正在读取软件包列表... 完成
正在分析软件包的依赖关系树       
正在读取状态信息... 完成       
下列软件包是自动安装的并且现在不需要了：
  snapd-login-service
使用'sudo apt autoremove'来卸载它(它们)。
将会同时安装下列软件：
  libaio1 libhtml-template-perl mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server-5.7
  mysql-server-core-5.7
建议安装：
  libipc-sharedcache-perl mailx tinyca
下列【新】软件包将被安装：
  libaio1 libhtml-template-perl mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server
  mysql-server-5.7 mysql-server-core-5.7
升级了 0 个软件包，新安装了 8 个软件包，要卸载 0 个软件包，有 365 个软件包未被升级。
需要下载 17.4 MB 的归档。
解压缩后会消耗 156 MB 的额外空间。
您希望继续执行吗？ [Y/n] Y

👆突然出现的色彩吓我一跳，设定root账户密码

获取:1 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-common all 5.7.33-0ubuntu0.16.04.1 [14.8 kB]
获取:2 http://mirrors.aliyun.com/ubuntu xenial/main amd64 libaio1 amd64 0.3.110-2 [6,356 B]
获取:3 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-client-core-5.7 amd64 5.7.33-0ubuntu0.16.04.1 [6,254 kB]
获取:4 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-client-5.7 amd64 5.7.33-0ubuntu0.16.04.1 [1,430 kB]
获取:5 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-server-core-5.7 amd64 5.7.33-0ubuntu0.16.04.1 [7,215 kB]
获取:6 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-server-5.7 amd64 5.7.33-0ubuntu0.16.04.1 [2,423 kB]
获取:7 http://mirrors.aliyun.com/ubuntu xenial/main amd64 libhtml-template-perl all 2.95-2 [60.4 kB]
获取:8 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 mysql-server all 5.7.33-0ubuntu0.16.04.1 [10.8 kB]
已下载 17.4 MB，耗时 2秒 (6,532 kB/s)    
正在预设定软件包 ...
正在选中未选择的软件包 mysql-common。
(正在读取数据库 ... 系统当前共安装有 223914 个文件和目录。)
正准备解包 .../mysql-common_5.7.33-0ubuntu0.16.04.1_all.deb  ...
正在解包 mysql-common (5.7.33-0ubuntu0.16.04.1) ...
正在选中未选择的软件包 libaio1:amd64。
正准备解包 .../libaio1_0.3.110-2_amd64.deb  ...
正在解包 libaio1:amd64 (0.3.110-2) ...
正在选中未选择的软件包 mysql-client-core-5.7。
正准备解包 .../mysql-client-core-5.7_5.7.33-0ubuntu0.16.04.1_amd64.deb  ...
正在解包 mysql-client-core-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在选中未选择的软件包 mysql-client-5.7。
正准备解包 .../mysql-client-5.7_5.7.33-0ubuntu0.16.04.1_amd64.deb  ...
正在解包 mysql-client-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在选中未选择的软件包 mysql-server-core-5.7。
正准备解包 .../mysql-server-core-5.7_5.7.33-0ubuntu0.16.04.1_amd64.deb  ...
正在解包 mysql-server-core-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在处理用于 libc-bin (2.23-0ubuntu11) 的触发器 ...
正在处理用于 man-db (2.7.5-1) 的触发器 ...
正在设置 mysql-common (5.7.33-0ubuntu0.16.04.1) ...
update-alternatives: 使用 /etc/mysql/my.cnf.fallback 来在自动模式中提供 /etc/mysql/my.cnf (my.cnf)
正在选中未选择的软件包 mysql-server-5.7。
(正在读取数据库 ... 系统当前共安装有 224077 个文件和目录。)
正准备解包 .../mysql-server-5.7_5.7.33-0ubuntu0.16.04.1_amd64.deb  ...
正在解包 mysql-server-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在选中未选择的软件包 libhtml-template-perl。
正准备解包 .../libhtml-template-perl_2.95-2_all.deb  ...
正在解包 libhtml-template-perl (2.95-2) ...
正在选中未选择的软件包 mysql-server。
正准备解包 .../mysql-server_5.7.33-0ubuntu0.16.04.1_all.deb  ...
正在解包 mysql-server (5.7.33-0ubuntu0.16.04.1) ...
正在处理用于 man-db (2.7.5-1) 的触发器 ...
正在处理用于 ureadahead (0.100.0-19.1) 的触发器 ...
ureadahead will be reprofiled on next reboot
正在处理用于 systemd (229-4ubuntu21.21) 的触发器 ...
正在设置 libaio1:amd64 (0.3.110-2) ...
正在设置 mysql-client-core-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在设置 mysql-client-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在设置 mysql-server-core-5.7 (5.7.33-0ubuntu0.16.04.1) ...
正在设置 mysql-server-5.7 (5.7.33-0ubuntu0.16.04.1) ...
update-alternatives: 使用 /etc/mysql/mysql.cnf 来在自动模式中提供 /etc/mysql/my.cnf (my.cnf)
Renaming removed key_buffer and myisam-recover options (if present)
正在设置 libhtml-template-perl (2.95-2) ...
正在设置 mysql-server (5.7.33-0ubuntu0.16.04.1) ...
正在处理用于 libc-bin (2.23-0ubuntu11) 的触发器 ...
正在处理用于 ureadahead (0.100.0-19.1) 的触发器 ...
正在处理用于 systemd (229-4ubuntu21.21) 的触发器 ...

🎉Mysql安装成功！

输入mysql -V 验证（注意是大写V）

mysql  Ver 14.14 Distrib 5.7.33, for Linux (x86_64) using  EditLine wrapper

配置远程web访问

🤷‍♀️创建远程用户并授权

如何在MySQL中创建用户并授予权限 | myfreax

这里不直接设置root账户远程访问允许也是出于安全考虑

🛹配置mysql远程连接

配置MySQL 远程连接 | myfreax

🎉本地服务器连接测试

💔使用外部服务器进行连接测试

环境描述

配置了远程mysql访问的服务器为ubuntu系统，mysql版本5.7

进行远程连接的外部服务器也为ubuntu系统，mysql版本5.7

问题产生

root@iZ2ze9hop1mk4g5wr67avnZ:~# mysql -u user1 -h 10.92.35.13 -p
Enter password: 
ERROR 2003 (HY000): Can't connect to MySQL server on '10.92.35.13' (110)

可以看到连接超时

原因分析

这里是博主的碎碎念，不一定能直切问题，想看解决办法的直接跳到问题解决部分

1.user1、mysql没配置好，这个最简单，再检查一遍就行了

检查user1允许远程访问ip
adminadmin@adminadmin-I620-G20:~$ mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.7.33-0ubuntu0.16.04.1 (Ubuntu)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input stateent.

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> SELECT User, Password, Host FROM user;
ERROR 1054 (42S22): Unknown column 'Password' in 'field list'
mysql> SELECT User, Host FROM user;
+------------------+-----------+
| User             | Host      |
+------------------+-----------+
| user1            | %         |
| debian-sys-maint | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+
5 rows in set (0.00 sec)

mysql> 

检查mysql远程监听端口
adminadmin@adminadmin-I620-G20:~$ sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
[sudo] adminadmin 的密码： 
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address            = 0.0.0.0 ///为0.0.0.0即允许所有ipv4
#
# * Fine Tuning
#
key_buffer_size         = 16M
max_allowed_packet      = 16M
thread_stack            = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched

2.虽然在服务器防火墙上开了3306端口，允许所有外部ip访问，但是可能服务器控制台的安全策略中3306端口还没有打开，导致无法连接

adminadmin@adminadmin-I620-G20:~$ sudo ufw status
状态：不活动
adminadmin@adminadmin-I620-G20:~$ sudo ufw allow 3306
防火墙规则已更新
规则已更新(v6)
adminadmin@adminadmin-I620-G20:~$ sudo ufw status verbose
状态：不活动
adminadmin@adminadmin-I620-G20:~$ iptables
iptables v1.6.0: no command specified
Try `iptables -h' or 'iptables --help' for more information.
adminadmin@adminadmin-I620-G20:~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy DROP)
target     prot opt source               destination         
DOCKER-USER  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-1  all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain DOCKER (12 references)
target     prot opt source               destination         

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target     prot opt source               destination         
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere            
RETURN     all  --  anywhere             anywhere            

Chain DOCKER-ISOLATION-STAGE-2 (12 references)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
RETURN     all  --  anywhere             anywhere            

Chain DOCKER-USER (1 references)
target     prot opt source               destination         
RETURN     all  --  anywhere             anywhere            
adminadmin@adminadmin-I620-G20:~$ 

这里可以发现，在配置mysql远程连接的时候犯了一个错误，一般ubuntu默认防火墙为UFW，所以我就检查了一下看到服务器上有UFW，然后就对此进行配置，结果现在一检查才发现还安装了iptables作为防火墙，没用UFW，所以同样的道理，我们把iptables上的3306端口打开

3.该服务器连接时需要校内环境才可访问，可能远程连接其的数据库也需要

4.主机的mysql没启动，需要把mysql设置成系统自启动

adminadmin@adminadmin-I620-G20:~$ systemctl status mysql
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: active (running) since 一 2024-02-05 13:13:15 CST; 10h ago
  Process: 2109 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, st
  Process: 1975 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, stat
 Main PID: 2108 (mysqld)
    Tasks: 34
   Memory: 193.2M
      CPU: 8.857s
   CGroup: /system.slice/mysql.service
           └─2108 /usr/sbin/mysqld

2月 05 13:13:08 adminadmin-I620-G20 systemd[1]: Starting MySQL Community Server...
2月 05 13:13:15 adminadmin-I620-G20 systemd[1]: Started MySQL Community Server.

尝试重启后再次使用systemctl status mysql ，发现mysql开启中，说明服务默认开机自启动

问题解决

太小丑了，一天了还没解决，fw竟是我自己😭

OK了，现在确定前面干的事情都没有问题，因为这个服务器是学校的，所以需要配置校园网环境，然后就可以通过workbench连接了，前面直接在我的阿里云服务器上尝试远程连接，上面没有校园网环境，肯定会连接失败，其实说白了，还是最外层学校那层防火墙的问题

如果是自己的服务器，我觉的就不会到这一步了，应该走完前面的配置过程，再记得在安全组里把3306端口打开，就没啥问题了

🎉校园网环境下workbench连接成功

不过虽然解决了无法成功连接的问题，但是又出现了新的问题，这样的连接很不稳定，基本上五次能成功连接一次，还在找原因中...

找到了，太抓马了，原来就是单纯的网络问题，我来总结一下为什么会出现连接不稳定的问题：

1. 切记把梯子关掉，校内vpn连接mysql时会与梯子冲突导致连接失败

2. 就是单纯的网络问题，现在是半夜两点，博主多次尝试登录，都稳定连接，白天情况就会差很多，可能是网络拥堵+多人都在用一个服务器导致的

3. 连接成功或失败关掉窗口以后不要立即再次连接，差不多要等一分钟再进行尝试

4. 确保没有另一个人也在尝试登这个远程账户，如果两个人一起登，导致超时连接失败的可能性会大大增大

这里不要有误解，同一个远程用户是可以同时在两台电脑上登录的，至于为什么这样不会出现数据冲突，是因为用户信息只是登录凭证，每个连接都是独立的，也就是我们常说的“多实例”