CI series two: MySQL installation and configuration

1. Completely uninstall the installed MySQL service

1. Stop the installed MySQL service

# service mysqld stop

2. View installed MySQL services

# rpm -qa | grep mysql
mysql-community-common-5.7.22-1.el6.x86_64
mysql57-community-release-el6-11.noarch
mysql-community-client-5.7.22-1.el6.x86_64
mysql-community-server-5.7.22-1.el6.x86_64
mysql-community-devel-5.7.22-1.el6.x86_64
mysql-community-libs-5.7.22-1.el6.x86_64

3. Uninstall the installed MySQL services one by one

# rpm -e --nodeps mysql-community-common-5.7.22-1.el6.x86_64
# rpm -e --nodeps mysql57-community-release-el6-11.noarch
# rpm -e --nodeps mysql-community-client-5.7.22-1.el6.x86_64
# rpm -e --nodeps mysql-community-server-5.7.22-1.el6.x86_64
# rpm -e --nodeps mysql-community-devel-5.7.22-1.el6.x86_64
# rpm -e --nodeps mysql-community-libs-5.7.22-1.el6.x86_64

4. Find and delete the installation directory and files of the installed MySQL service

4.1. Find

# find / -name mysql
/usr/share/mysql
/var/lib/mysql
/var/lib/mysql/mysql

4.2. Delete one by one

# rm -rf /usr/share/mysql/
# rm -rf /var/lib/mysql/

Second, sftp upload file: mysql57-community-release-el6-11.noarch.rpm, the specific upload process can refer to the blog (CI series one: JDK installation and configuration)

3. Install MySQL

1. Move mysql57-community-release-el6-11.noarch.rpm to the installation directory

# mv mysql57-community-release-el6-11.noarch.rpm /usr/local

2. Switch to the installation directory

# cd /usr/local 

3. Install rpm

# yum -y install mysql57-community-release-el6-11.noarch.rpm

4. Install MySQL

# yum -y install mysql-server mysql mysql-devel

Fourth, set the login password of the MySQL user root

1. Start MySQL in normal mode and initialize the database

# service mysqld start

2. Stop the mysql service and start MySQL in safe mode

# service mysqld stop
# mysqld_safe --skip-grant-tables&

3. Password-free login in safe mode to set root login password

3.1. Password-free login in safe mode

#输入命令之后，连续点击enter键，无需输入登录密码
# mysql -uroot -p

3.2. Set the login password

 > update mysql.user set authentication_string=password('******') where User = 'root' and Host='localhost';

3.3. Refresh permissions to make the password take effect

> flush privileges

3.4. Exit the MySQL client

> quit

4. Restart the MySQL service, reset the password after the normal mode is started, so that MySQL can be operated normally

4.1. Restart the MySQL service

# service mysqld restart

4.2. Log in with the password you just set

# mysql -uroot -p

4.3. Reset password

> set password for 'root'@'localhost' = password('******');

4.4. Refresh permissions to make the password take effect

> flush privileges

4.5. Exit the MySQL client

> quit

Five, set MySQL to start automatically

1. Set MySQL to start automatically at boot

# chkconfig mysqld on

2. Check whether the setting is successful, the success information is as follows

# chkconfig --list mysqld
mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off

Six, set up MySQL remote login

1. Edit the firewall configuration file, add the following line, open port 3306

# vi /etc/sysconfig/iptables
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

2. Restart the firewall to make the open ports take effect

# service iptables restart

3. Check whether the port is successfully opened

# service iptables status

4. Use the password to log in to MySQL and set up MySQL remote login

# mysql -uroot -p
> update mysql.user set Host = '%' where User = 'root';

5. Refresh permissions to make remote login take effect

> flush privileges

6. Exit the MySQL client

> quit