[root@cent ~]# systemctl is-enabled firewalld ←OS起動時の状態確認（Firewall有効）
enabled
[root@cent ~]#
[root@cent ~]#
[root@cent ~]# systemctl disable firewalld ←Firewall起動ショートカット削除
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@cent ~]#
[root@cent ~]#
[root@cent ~]# systemctl is-enabled firewalld ←OS起動時の状態確認（Firewall無効）
disabled
[root@cent ~]#
[root@cent ~]#
[root@cent ~]# systemctl enable firewalld ←Firewall起動ショートカット作成
Created symlink from /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service to /usr/lib/systemd/system/firewalld.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/firewalld.service to /usr/lib/systemd/system/firewalld.service.
[root@cent ~]#
[root@cent ~]#
[root@cent ~]# systemctl is-enabled firewalld ←OS起動時の状態確認（Firewall有効）
enabled
[root@cent ~]#
