Linux系统下mysql安装,设置开机启动

版权声明：本文为博主原创文章版权归作者和CSDN共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。 https://blog.csdn.net/javaee_gao/article/details/89552953

• 安装依赖
  yum -y install autoconf libaio bison ncurses-devel
• 创建用户
  groupadd mysql
  useradd -g mysql -s /sbin/nologin mysql
• 下载安装包
  wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz
• 解压安装包
  mkdir -p /soft/server/mysql
  tar -zxvf mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz -C /soft/server/
  mv mysql-5.7.21-linux-glibc2.12-x86_64 mysql
  mkdir /soft/log/mysql
  mkdir /soft/server/mysql/data
• 授权
  chown -R mysql:mysql /soft/server/mysql
  chown -R mysql:mysql /soft/log/mysql
• 修改默认的my.conf

[client]
port = 3306
socket = /soft/server/mysql/mysql.sock
 
[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
basedir=/soft/server/mysql
datadir=/soft/server/mysql/data
socket=/soft/server/mysql/mysql.sock
log-error=/soft/log/mysql/mysqld.log
pid-file=/soft/server/mysql/mysqld.pid

• 初始化
  cd /soft/server/mysql/bin
  /soft/server/mysql/bin/mysqld --initialize --user=mysql --basedir=/soft/server/mysql --datadir=/soft/server/mysql/data --lc_messages_dir=/soft/server/mysql/share --lc_messages=en_US
• 加入systemctl 完成开机自动启动
  vim /lib/systemd/system/mysql.service

[Unit]
Description=mysql
After=network.target remote-fs.target nss-lookup.target
 
[Service]
Type=forking
ExecStart=/soft/server/mysql/support-files/mysql.server start
ExecReload=/soft/server/mysql/support-files/mysql.server restart
ExecStop=/soft/server/mysql/support-files/mysql.server stop
PrivateTmp=true
 
[Install]
WantedBy=multi-user.target

Description:描述服务
After:描述服务类别
[Service]服务运行参数的设置
Type=forking是后台运行的形式
ExecStart为服务的具体运行命令
ExecReload为重启命令
ExecStop为停止命令
PrivateTmp=True表示给服务分配独立的临时空间
注意：[Service]的启动、重启、停止命令全部要求使用绝对路径
[Install]运行级别下服务安装的相关设置，可设置为多用户，即系统运行级别为3

• 设置环境变量

echo ‘PATH=$PATH’:/ops/server/mysql/bin >> /etc/profile
source /etc/profile

• 启动
  systemctl daemon-reload
  systemctl start mysql
  systemctl enable mysql
• 查看密码
  cat -n /ops/log/mysql/mysqld.log | grep ‘root@localhost’ ,出现后面就是mysql的初始密码。
  mysql -u root -p 初始密码登陆进去后，需要修改初始密码，mysql才可以正常连接。
  修改mysql密码为为123456 ：ALTER USER USER() IDENTIFIED BY '123456';
• 修改mysql只能本地连接
  SELECT DISTINCT CONCAT(‘User: ‘’’,user,’’’@’’’,host,’’’;’) AS query FROM mysql.user;
  
  CREATE USER ‘root’@’%’ IDENTIFIED BY ‘123456’;
  GRANT ALL ON . TO ‘root’@’%’;
  flush privileges;
  
  此时内网就可以连接上mysql啦！