--注意集群环境操作要重启docker
vim /etc/sysconfig/iptables-config

IPTABLES_SAVE_ON_STOP="yes"
IPTABLES_SAVE_ON_RESTART="yes"

--目前配置（docker会改他）保留到文件
 iptables-save > /etc/sysconfig/iptables
（iptables -A INPUT -p tcp --dport 2375 -j ACCEPT）
--确认更正ip
vim /etc/sysconfig/iptables

--关闭和注销firewall
systemctl stop firewalld
systemctl disable firewalld
systemctl  mask  firewalld

--查看安装了iptables没有
yum list installed | grep iptables-services

--安装
yum install iptables-services -y

--重启iptables
systemctl restart iptables

--设置iptables开机自启
 systemctl enable iptables

--注意集群环境操作要重启docker
vim /etc/sysconfig/iptables-config

IPTABLES_SAVE_ON_STOP="yes"
IPTABLES_SAVE_ON_RESTART="yes"

1.已开启docker容器：

--目前配置（docker会改他）保留到文件
iptables-save > /etc/sysconfig/iptables

--确认更正ip
vim /etc/sysconfig/iptables

--关闭和注销firewall
systemctl stop firewalld
systemctl disable firewalld
systemctl mask firewalld

--查看安装了iptables没有
yum list installed | grep iptables-services

--安装
yum install iptables-services -y

--重启iptables
systemctl restart iptables

--设置iptables开机自启
systemctl enable iptables

防火墙好重启docker