在 CentOS 7

暂时开放 ftp 服务
# firewall-cmd --add-service=ftp

永久开放 ftp 服务
# firewall-cmd --add-service=ftp --permanent
永久关闭
# firewall-cmd --remove-service=ftp --permanent
success

让设定生效
# systemctl restart firewalld

检查设定是否生效
# iptables -L -n | grep 21
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:21 ctstate NEW

检查防火墙状态
# firewall-cmd --state
running

# systemctl stop firewalld
# firewall-cmd --state
not running

# firewall-cmd --list-all
public (default)
  interfaces:
  sources:
  services: dhcpv6-client ftp ssh
  ports:
  masquerade: no
  forward-ports:
  icmp-blocks:
  rich rules:

在 FirewallD 的服务名称
# firewall-cmd --get-service
amanda-client bacula bacula-client dhcp dhcpv6 dhcpv6-client dns ftp high-availability http https imaps ipp ipp-client ipsec kerberos kpasswd ldap ldaps libvirt libvirt-tls mdns mountd ms-wbt mysql nfs ntp openvpn pmcd pmproxy pmwebapi pmwebapis pop3s postgresql proxy-dhcp radius rpc-bind samba samba-client smtp ssh telnet tftp tftp-client transmission-client vnc-server wbem-https

查询服务的启用状态
# firewall-cmd --query-service ftp
yes
# firewall-cmd --query-service ssh
yes
# firewall-cmd --query-service samba
no
# firewall-cmd --query-service http
no

自行加入要开放的 Port
# firewall-cmd --add-port=3128/tcp
# firewall-cmd --list-all
public (default)
  interfaces:
  sources:
  services: dhcpv6-client ftp ssh
  ports: 3128/tcp
  masquerade: no
  forward-ports:
  icmp-blocks:
  rich rules: