Using yum Centos7 mounted mysql-server 5.x

To install MySQL 5.x version, for example, the operating system version is CentOS Linux release 7.7.1908 (Core).

First, if there is already mysql-server checks yum source,

# Command line execution
yum update
rpm -qa | grep mysql

# Command line display
mysql-community-client-5.6.36-2.el5.x86_64
mysql-community-common-5.6.36-2.el5.x86_64
mysql-community-server-5.6.36-2.el5.x86_64
mysql-community-release-el5-7.noarch
mysql-community-libs-5.6.36-2.el5.x86_64
mysql-5.6.36-2.el5.x86_64
mysql-community-libs-compat-5.6.36-2.el5.x86_64

# If you do not see mysql-server to add the source into the second step, I installed here, so already we have.
# If your system also has a display, you can skip the second step.

Second, add source mysql-server

# 1. First download rpm, mysql source directory is: http: //repo.mysql.com/, you can copy the appropriate rpm according to the version needs its own address
wget http://repo.mysql.com/mysql-community-release-el5-7.noarch.rpm

# 2. Installation Source
rpm -ivh mysql-community-release-el5-7.noarch.rpm

Third, install and start mysql-server

# Command line execution
yum install mysql-server

# View service startup state
service mysqld status

# Default profile here
vim /etc/my.cnf

# Start command
service mysqld start

# Reboot command
service mysqld restart

# Stop command
service mysqld stop

Fourth, the profile settings

# Open the configuration file
vim my.cnf

# Key configuration items
[mysqld]
port = 3306 # the default port, without this line, you can add or modify another port manually
... ignore other configuration items display

# If you remember to adjust the configuration file restart the service
service mysqld restart

Fifth, set the root password

# 1. Turn on password-free support
# No password to access different versions of mysql console methods may differ, provides two ways here:
# the first method:
Add a skip-grant-tables in the configuration file, the configuration file something like this:
[mysqld]
port=3306
skip-grant-tables
... other configuration items
# Restart Service
service mysqld restart

# The second method:
mysqld_safe --skip-grant-table &

# 2. Enter the mysql command mysql to go directly to the console
mysql

# 3. Go to mysql database
mysql> use mysql;
Database changed

4. Modify the root password # 123456, pay attention to the old version may be password field instead of authentication_string, means the same as changing field can be updated
mysql> update user set authentication_string = password('123456') where user = 'root';
Query OK, 4 rows affected (0.00 sec) 
Rows matched: 4  Changed: 4  Warnings: 0

# 5. Update Authorization
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

# 6. recovery password restrictions
# If the first method is used to enter the console, just you need to skip-grant-tables added to the configuration file removed
vim /etc/my.cnf
Delete skip-grant-tables

# If you are using the second method to enter the console, kill mysqld_safe and mysqld process

# 7. Restart Service
service mysqld restart

Sixth, re-login Test

mysql -u root -p

Using yum Centos7 mounted mysql-server 5.x

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