关闭不必要的服务
[root@node1 run]# chkconfig NetworkManager off
Note: Forwarding request to 'systemctl disable NetworkManager.service'.
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
[root@node1 run]# systemctl stop firewalld.service
[root@node1 run]# systemctl disable firewalld.service
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
[root@node1 run]# setenforce 0
[root@node1 run]# vi /etc/selinux/config
SELINUX=disabled