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Remove MySQL Community edition quickly: Let us imagine you have following rpm installed on server mysql-community-client.x86_64 mysql-community-common.x86_64 mysql-community-devel.x86_64 mysql-community-embedded-compat.x86_64 mysql-community-libs.x86_64 mysql-community-libs-compat.x86_64 mysql-community-server.x86_64 and you would like to remove everything you can use following command #yum remove mysql-community-common.x86_64 while removing you will see the message it is removing dependencies and all other rpm package will be removed Removing for dependencies: mysql-community-client  mysql-community-devel              mysql-community-embedded-compat mysql-community-libs mysql-community-libs-compat mysql-community-server   While removing it will save my.cnf as my.cnf.rpmsave

Configure MySQL 8.0.17 Community Edition for Red Hat Linux and Cent OS: 01. Create following directory structure on each server for MySQL datadir, binlog, iblogs and temp: /mysql/<project_name>/ /mysql/<project_name>/binlog /mysql/<project_name>/iblogs /mysql/<project_name>/temp 02. Edit file /etc/my.cnf as and include following minimum parameters to initialize mysqld. Make sure to change port and server-id unique for each server. Refer excel sheet. Minimum content of /etc/my.cnf file to initialize mysqld: datadir=/mysql/<project_name> socket=/mysql/<project_name>/<project_name>.sock port=<port_no> server-id=<port_no> log-error=/mysql/<project_name>_error.log 03. Configure systemd to manage mysqld using systemctl: a. Edit file /usr/lib/systemd/system/mysqld.service b. Under section [Service] include following line PIDFile=/mysql/<project_name>/<project_name>.pid c. Under section [Service], at Start main service,

MySQL 8.0.17 Community Edition installation for Red Hat Linux and Cent OS: 01. Disable Firewall: # systemctl stop firewalld # systemctl disable firewalld 02. Set Selinux to permissive: #vi /etc/sysconfig/selinux, and replace word enforcing to permissive Content of file /etc/sysconfig/selinux: # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: #     enforcing - SELinux security policy is enforced. #     permissive - SELinux prints warnings instead of enforcing. #     disabled - No SELinux policy is loaded. SELINUX=permissive # SELINUXTYPE= can take one of three values: #     targeted - Targeted processes are protected, #     minimum - Modification of targeted policy. Only selected processes are protected. #     mls - Multi Level Security protection. SELINUXTYPE=targeted 03. Remove Maria DB: #yum remove mariadb-libs.x86_64 04. Download MySQL software for Red Hat Linux: Visit Link - https://dev.mysql.com/downloads/mysql/, select Red Hat