[root@localhost bin]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
active: active (running) since wed 2020-10-14 20:47:45 edt; 50min ago
docs: man:firewalld(1)
main pid: 6267 (firewalld)
cgroup: /system.slice/firewalld.service
└─6267 /usr/bin/python -es /usr/sbin/firewalld --nofork --nopid
oct 14 20:47:44 localhost.localdomain systemd[1]: starting firewalld - dynamic firewall daemon...
oct 14 20:47:45 localhost.localdomain systemd[1]: started firewalld - dynamic firewall daemon.
[root@localhost bin]#
[root@localhost bin]# systemctl stop firewalld
[root@localhost bin]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
active: inactive (dead) since wed 2020-10-14 21:41:01 edt; 2s ago
docs: man:firewalld(1)
process: 6267 execstart=/usr/sbin/firewalld --nofork --nopid $firewalld_args (code=exited, status=0/success)
main pid: 6267 (code=exited, status=0/success)
oct 14 20:47:44 localhost.localdomain systemd[1]: starting firewalld - dynamic firewall daemon...
oct 14 20:47:45 localhost.localdomain systemd[1]: started firewalld - dynamic firewall daemon.
oct 14 21:41:00 localhost.localdomain systemd[1]: stopping firewalld - dynamic firewall daemon...
oct 14 21:41:01 localhost.localdomain systemd[1]: stopped firewalld - dynamic firewall daemon.
[root@localhost bin]# systemctl start firewalld
[root@localhost bin]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
active: active (running) since wed 2020-10-14 21:41:17 edt; 3s ago
docs: man:firewalld(1)
main pid: 8128 (firewalld)
cgroup: /system.slice/firewalld.service
└─8128 /usr/bin/python -es /usr/sbin/firewalld --nofork --nopid
oct 14 21:41:17 localhost.localdomain systemd[1]: starting firewalld - dynamic firewall daemon...
oct 14 21:41:17 localhost.localdomain systemd[1]: started firewalld - dynamic firewall daemon.
[root@localhost bin]#
上面開啟和關閉防火牆都是臨時的，重啟電腦後又會恢復到預設的狀態。假如先關閉了防火牆，然後輸入reboot重啟centos7，重啟後再執行檢視防火牆的命令會發現防火牆還是開啟的狀態。
如果想重啟後防火牆還是處於關閉的狀態，得使用命令：
sudo systemctl disable firewalld。
檢視防火牆的狀態的命令為：sudo systemctl status firewalld。
開啟防火牆的方式有兩種，一種是開啟後重啟會恢復回原來的狀態，命令為：sudo systemctl start firewalld；另一種是開啟後重啟不會恢復到原來的狀態，命令為：sudo systemctl enable firewalld，這種方式輸入命令後要重啟系統才會生效。
關閉防火牆的方式也有兩種，和開啟相對應，命令分別為
sudo systemctl stop firewalld
sudo systemctl disable firewalld。
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