centeros7安装mysql

mkdir ~/mysql
cd ~/mysql

wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar

tar -xvf mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar

rpm -ivh mysql-community-common-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.26-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-compat-5.7.26-1.el7.x86_64.rpm
# 输出
# warning: mysql-community-libs-compat-5.7.26-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
# error: Failed dependencies:
#        mysql-community-libs(x86-64) >= 5.7.9 is needed by mysql-community-libs-compat-5.7.26-1.el7.x86_64

yum remove mysql-libs 

sudo systemctl start mysqld.service

sudo systemctl status mysqld.service
# 输出
* mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2020-07-28 10:16:22 CST; 26s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 32418 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 32392 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 32421 (mysqld)
    Tasks: 27
   Memory: 297.0M
   CGroup: /system.slice/mysqld.service
           `-32421 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Jul 28 10:16:16 VM_55_42_centos systemd[1]: Starting MySQL Server...
Jul 28 10:16:22 VM_55_42_centos systemd[1]: Started MySQL Server.

sudo systemctl stop mysqld.service

sudo systemctl restart mysqld.service

# 查看临时密码
sudo grep 'temporary password' /var/log/mysqld.log
# 链接mysql
mysql -uroot -p

mysql>alter user 'root'@'localhost' identified by 'youpassword'; 

 set global validate_password_policy=LOW;

 set global validate_password_length=6;