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  CentOS7 install MySQL 5.5
  Add Date : 2018-11-21      
  First CentOS 7 no longer supports MySQL, because you know the charges, so mariadb internal integration, and installation files, then will the conflict MySQL and mariadb, so you need to uninstall mariadb, the following for uninstallation mariadb, step MySQL installation.

# List all rpm package is installed
rpm -qa | grep mariadb

# Uninstall

rpm -e mariadb-libs-5.5.37-1.el7_0.x86_64

Error: dependency test failed:
        libmysqlclient.so.18 () (64bit) is (already installed) postfix-2: 2.10.1-6.el7.x86_64 need
        libmysqlclient.so.18 (libmysqlclient_18) (64bit) is (already installed) postfix-2: 2.10.1-6.el7.x86_64 need

# Force Uninstall, because there is no --nodeps

rpm -e --nodeps mariadb-libs-5.5.37-1.el7_0.x86_64

# Rpm packages installed mysql5.5.39

rpm -ivh /home/liwei/MySQL-server-5.5.39-2.el6.x86_64.rpm

rpm -ivh /home/liwei/MySQL-client-5.5.39-2.el6.x86_64.rpm

# Copy profile

cp /usr/share/mysql/my-medium.cnf /etc/my.cnf, as renamed my.cnf mysql configuration file.

# Modify the response profile

vim /etc/my.cnf

# Mysql's data copied to the formulated directory

mv / var / lib / mysql / home / mysql / data /

Also note that the directory owner and permissions.

After the start MYSQL message:! ERROR The server quit without updating PID file to solve the wrong problem

1, enough authority: chown -R mysql: mysql / home / mysql / data "" chmod -R 755 / home / mysql / data

2, CentOS selinux Question 7: Open the / etc / selinux / config, the SELINUX = enforcing SELINUX save and exit to restart the machine after = disabled.
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