mariaDB安装后没法使用

起因是为了安装Cacti 监控软件！！
MariaDB 安装
#yum -y install httpd php php-mysql php-ldap php-xml mysql mysql-server net-snmp net-snmp-utils lm_sensors
设置数据库登录密码 #mysqladmin -hlocalhost -uroot password “123456” 失败
出现：mysqladmin: connect to server at ‘localhost’ failed
error: ‘Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)’
Check that mysqld is running and that the socket: ‘/var/lib/mysql/mysql.sock’ exists!
分析原因：
1、可能是因为之前安装了MySQL ，产生冲突
*# systemctl status mariadb active(running)没问题
#rpm -qa |grep -i mysql 查看一下！！
删除MySQL #rm /var/lib/mysql
# rm -rf /var/share.mysql
#systemctl list-unit-files |grep mysql
#systemctl disable mysql.service
2、可能是由于mariadb没有安装完整
*# systemctl status mariadb 失败 failed
删除MariaDB #rpm -e mariadb mariadb-server
#systemctl list-unit-files |grep mariadb
重新安装 #yum search mariadb
#yum -y install mariadb mariadb-server mariadb-bench mariadb-libs
#systemctl restart mariadb
#systemctl enable mariadb
设置数据库管理员登陆密码：
# mysqladmin -hlocalhost -uroot password “123456” 成功！！
#mysql -uroot -p123456
MariaDB>