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。。。