docker遇到防火墙报错问题解决方法

-- 报错信息
[root@localhost docker]# docker run -d -p 5000:5000 training/webapp python app.py
cc61442060cb810633a06bd6ea692a3df6b0bfcadc6a7dadfe53bf875f1ac3b9
docker: Error response from daemon: driver failed programming external connectivity on endpoint pensive_hodgkin (ae7e41e1b2b98b6b482316085c22303d8a61c02d09eb21c241132da1ea34d58a): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 5000 -j DNAT --to-destination 172.17.0.3:5000 ! -i docker0: iptables: No chain/target/match by that name.
(exit status 1)).

解决方法：
1.kill掉docker所有进程

pkill docker

2.清空nat表的所有链

iptables -t nat -F

3.停止docker默认网桥docker0

ifconfig docker0 down

4.删除docker0网桥

brctl delbr docker0

5.重启docker服务

systemctl restart docker

重新启动docker容器

docker run -d -p : training/webapp python app.py