centos7安装mysql及配置

官网下载最新版本的mysql （community版本)

1. 官网地址：https://dev.mysql.com/downloads

2. 下载&安装

wget https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm
rpm -ivh mysql57-community-release-el7-11.noarch.rpm
yum update
yum install mysql-server 

3. 权限设置

chown mysql:mysql -R /var/lib/mysql

4. 初始化 MySQL

mysqld --initialize

5. 启动 MySQL：

systemctl start mysqld

发现启动失败

查看错误日志 /var/log/mysqld.log

2019-02-28T11:57:34.064645Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-02-28T11:57:34.066491Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.25) starting as process 3021 ...
2019-02-28T11:57:34.069638Z 0 [Note] InnoDB: PUNCH HOLE support available
2019-02-28T11:57:34.069668Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2019-02-28T11:57:34.069673Z 0 [Note] InnoDB: Uses event mutexes
2019-02-28T11:57:34.069676Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2019-02-28T11:57:34.069680Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2019-02-28T11:57:34.069683Z 0 [Note] InnoDB: Using Linux native AIO
2019-02-28T11:57:34.069954Z 0 [Note] InnoDB: Number of pools: 1
2019-02-28T11:57:34.070075Z 0 [Note] InnoDB: Using CPU crc32 instructions
2019-02-28T11:57:34.071616Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2019-02-28T11:57:34.079929Z 0 [Note] InnoDB: Completed initialization of buffer pool
2019-02-28T11:57:34.082097Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2019-02-28T11:57:34.092128Z 0 [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable
2019-02-28T11:57:34.092142Z 0 [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable
2019-02-28T11:57:34.092149Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2019-02-28T11:57:34.692583Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2019-02-28T11:57:34.692619Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2019-02-28T11:57:34.692625Z 0 [ERROR] Failed to initialize builtin plugins.
2019-02-28T11:57:34.692629Z 0 [ERROR] Aborting

解决：

chmod -R 777 /var/lib/mysql

6. 查看 MySQL 运行状态

systemctl status mysqld

7. 验证 MySQL 安装

 mysqladmin --version

7. 使用 MySQL Client

mysql #发现登陆需要密码

grep 'temporary password' /var/log/mysqld.log #找不到
#删除原来安装过的mysql残留的数据
rm -rf /var/lib/mysql

mysql -p 

set password=password("123456"); #密码要复杂些，否则不通过

至此mysql已经安装完毕!