安装MySQL 5.6
记录安装mysql 5.6的全过程
下载安装包（尝试过使用mysql的yum源去安装--如果你的网络够好的话。。。）
注：我的系统是Centos 7.2的 如下，根据自己的需求去下载
CentOS Linux release 7.2.1511 (Core) 3.10.0-327.el7.x86_64
下载下面的rpm 捆绑包，下载这一个
Centos服务器上安装MySQL依赖包
yum -y install perl perl-devel net-tools
将下载好的捆绑包上传到服务器
解压
[root@WCY mysql56]# ls MySQL-5.6.41-1.el7.x86_64.rpm-bundle.tar [root@WCY mysql56]# tar xf MySQL-5.6.41-1.el7.x86_64.rpm-bundle.tar [root@WCY mysql56]# ls MySQL-5.6.41-1.el7.x86_64.rpm-bundle.tar MySQL-embedded-5.6.41-1.el7.x86_64.rpm MySQL-shared-compat-5.6.41-1.el7.x86_64.rpm MySQL-client-5.6.41-1.el7.x86_64.rpm MySQL-server-5.6.41-1.el7.x86_64.rpm MySQL-test-5.6.41-1.el7.x86_64.rpm MySQL-devel-5.6.41-1.el7.x86_64.rpm MySQL-shared-5.6.41-1.el7.x86_64.rpm
创建MySQL用户与组
useradd -M -s /sbin/nologin mysql
安装
rpm -ivh MySQL-client-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-shared-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-devel-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-shared-compat-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-embedded-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-test-5.6.41-1.el7.x86_64.rpm rpm -ivh MySQL-server-5.6.41-1.el7.x86_64.rpm
创建mysql配置文件my.cnf
[root@WCY ~]# cp /usr/share/mysql/my-default.cnf /etc/my.cnf
初始化MySQL
[root@WCY ~]# /usr/bin/mysql_install_db FATAL ERROR: please install the following Perl modules before executing /usr/bin/mysql_install_db: Data::Dumper
报错解决：
[root@WCY ~]# yum install -y perl-Module-Install.noarch
解决完报错别忘了 再执行初始化
启动MySQL
[root@WCY ~]# systemctl start mysql Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
启动报错，查看下
[root@WCY ~]# journalctl -xe 9月 20 21:25:03 WCY.local yum[18450]: Installed: perl-HTTP-Daemon-6.01-7.el7.noarch 9月 20 21:25:03 WCY.local yum[18450]: Installed: perl-HTTP-Negotiate-6.01-5.el7.noarch ································· 9月 20 21:31:18 WCY.local mysql[18635]: Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/WCY.local.pid). 9月 20 21:31:18 WCY.local systemd[1]: mysql.service: control process exited, code=exited status=1 9月 20 21:31:18 WCY.local systemd[1]: Failed to start LSB: start and stop MySQL.
可以看到
ERROR! The server quit without updating PID file (/var/lib/mysql/WCY.local.pid).
先设置下目录权限
[root@WCY ~]# chown -R mysql:mysql /var/lib/mysql/
再启动
[root@WCY ~]# systemctl start mysql.service [root@WCY ~]# netstat -anpt | grep mysql tcp6 0 0 :::3306 :::* LISTEN 18891/mysqld
已启动
设置MySQL密码
[root@WCY ~]# /usr/bin/mysqladmin -u root password 'mima'
‘mima’替换为你要设置的密码
如果你的系统版本是CentOS6.x的
安装完MySQL5.6.x后密码为自动生成的保存在本用户目录下隐藏文件.mysql_secret
[root@Check1 ~]# cat .mysql_secret # The random password set for the root user at Sat Oct 20 11:37:06 2018 (local time): c5SoTcrXmMYFBMsU
更改root密码
[root@Check1 ~]# mysql -uroot -pc5SoTcrXmMYFBMsU 使用生成的密码登录数据库测试一下 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 5.6.41 Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. 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 statement. mysql> quit Bye [root@Check1 ~]# mysqladmin -uroot -p password '123123' 设置新的密码为123123 回车后输入上面生成的密码 Enter password: Warning: Using a password on the command line interface can be insecure. [root@Check1 ~]# mysql -uroot -p123123 用新密码登录 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 10 Server version: 5.6.41 MySQL Community Server (GPL) Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. 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 statement. mysql>
安装结束，优化后续再说。。。
