Remove completely
1. Review the MySQL installation which things
rpm -qa |grep -i mysql
2. Uninstall
yum remove mysql-community-common-5.7.20-1.el7.x86_64 yum remove mysql-community-client-5.7.20-1.el7.x86_64 yum remove mysql57-community-release-el7-11.noarch yum remove mysql-community-libs-5.7.20-1.el7.x86_64 yum removemysql-community-server-5.7.20-1.el7.x86_64
mariadb 也要删除-qa RPM | grep MariaDB RPM -e - nodeps package name (for example: - nodeps MariaDB RPM -e-libs- 5.5 . 44 - 2 .el7.centos.x86_64)
3. Check whether the uninstall is complete
4. Find the MySQL-related directory
find / -name mysql
5. Delete Related Category
rm -rf
6. Delete /etc/my.cnf
rm -rf /etc/my.cnf
7. Delete /var/log/mysqld.log (if you do not delete this file, it will lead to a new installation of MySQL can not generate a new password, making it impossible landing)
rm -rf /var/log/mysqld.log
installation
1. Increase official yum source (to 5.6, for example)
Create and edit mysql- community.repo file
we / etc / yum .repos.d / MySQL community.repo
The paste the following into it and save
[mysql56-community] name=MySQL 5.6 Community Server baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/ enabled=1 gpgcheck=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Note: gpgcheck is GPG encryption check, official documents is 1, but the check will report an error, so here changed to 0 to skip the check, had no effect on the installation.
2. Install MySQL
sudo yum -y install mysql-community-server
Results are as follows:
Installed: mysql-community-server.x86_64 0:5.6.41-2.el7 Dependency Installed: mysql-community-client.x86_64 0:5.6.41-2.el7 mysql-community-common.x86_64 0:5.6.41-2.el7 mysql-community-libs.x86_64 0:5.6.41-2.el7 net-tools.x86_64 0:2.0-0.22.20131004git.el7 perl-DBI.x86_64 0:1.627-4.el7 perl-Net-Daemon.noarch 0:0.48-5.el7 perl-PlRPC.noarch 0:0.2020-14.el7 Complete!
3. Start MySQL and MySQL to allow self-priming
sudo systemctl start mysqld sudo systemctl enable mysqld
Configuration coding
1. Go to View MySQL coding
show variables like '%character%';
The results are as follows:
mysql> show variables like '%character%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | latin1 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+
2. Modify coding
the sudo VI / etc / the my.cnf # character is then added under [mysqld] -set-Server = UTF8 the sudo VI /etc/my.cnf.d/ client.cnf # default then added in [client] under -character-set = utf8
3. Again View Code:
mysql> show variables like '%character%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+