systemctl status firewalld firewall-cmd --help # 关于防火墙设置关于docker swarm 防火墙设置 How to Configure the Linux Firewall for Docker Swarm on CentOS 7 | DigitalOceanhttps://www.digitalocean.com/community/tutorials/how-to-configure-the-linux-firewall-for-docker-swarm-on-centos-7
