CentOS安装MySQL5.7

前言

因为安装seafile需要mysql，所以需要在centos上安装mysql，遇到了一点点坑

参考

CentOS7 64位安装mysql教程，亲测完美 设置mysql5.7远程连接

安装

1. 先检查系统是否装有mysql

rpm -qa | grep mysql

这里返回空值，说明没有安装 （这里执行yum install mysql安装命令是无效的，因为centos-7默认是Mariadb，所以执行以下命令只是更新Mariadb数据库）

2. 下载并安装mysql的repo源

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm

安装这个包后，会获得两个mysql的yum repo源：/etc/yum.repos.d/mysql-community.repo，/etc/yum.repos.d/mysql-community-source.repo。 3. 安装mysql

# sudo yum install mysql-server

如果报错，内容含有

Error: Package: mysql-community-libs-5.6.35-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
Error: Package: mysql-community-server-5.6.35-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
Error: Package: mysql-community-server-5.6.35-2.el7.x86_64 (mysql56-community)
           Requires: systemd
Error: Package: mysql-community-server-5.6.35-2.el7.x86_64 (mysql56-community)
           Requires: libstdc++.so.6(GLIBCXX_3.4.15)(64bit)
Error: Package: mysql-community-client-5.6.35-2.el7.x86_64 (mysql56-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

解决方法：

yum install glibc.i686
yum list libstdc++*

4. 重置密码 重置密码前，首先要登录

mysql -u root

登录时有可能报这样的错：ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ ，原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户：

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

然后，重启服务：

service mysqld restart

接下来登录重置密码：

mysql -u root
mysql > use mysql;
mysql > update user set password=password('123456') where user='root';
mysql > exit;

重启mysql服务后才生效

service mysqld restart

5. 允许远程登录

mysql -u root -p
# 输入密码
use mysql;
Grant all on *.* to 'root'@'%' identified by 'root用户的密码' with grant option;
flush privileges;