环境检查 [root@db01 bin]# cat /etc/redhat-release CentOS Linux release 7.5.1804 (Core) [root@db01 bin]# uname -r 3.10.0-862.el7.x86_64 [root@db01 bin]# hostname -I 10.0.0.51 172.16.1.51 mha环境准备 （准备三个节点，三台主机，分别修改如下的ip） 系统配置 hostnamectl set-hostname db01 nmcli connection modify eth0 ipv4.addresses 10.0.0.51/24 nmcli connection modify eth1 ipv4.addresses 172.16.1.53/24 nmcli connection down eth1 && nmcli connection up eth1 nmcli connection down eth0 && nmcli connection up eth0 cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.0.0.51 db01 10.0.0.52 db02 10.0.0.53 db03