[求助] docker 容器无法连接外网，折腾了好久没搞定。

[quadrapop]

尝试了网上各种方法还是不行，请大家帮忙看看是哪里的原因

宿主机配置

主机防火墙未开启

brctl show

docker0         8000.8aa94e25aa49       no              vethdd1f0f9

ip addr

docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 8a:a9:4e:25:aa:49 brd ff:ff:ff:ff:ff:ff
    inet 172.17.10.1/24 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::18c9:95ff:fe72:fa1e/64 scope link 
       valid_lft forever preferred_lft forever

docker daemon.json

{
  "registry-mirrors": ["https://3laho3y3.mirror.aliyuncs.com"],
  "graph": "/home/docker/lib",
  "bip":"172.17.10.1/24",
  "dns":["114.114.114.114"]
}

主机 ipv4 转发开启

sysctl -p
vm.nr_hugepages = 1208
vm.nr_hugepages = 1208
vm.nr_hugepages = 1208
net.ipv4.ip_forward = 1

docker 容器

ip route

bash-5.1# ip route
default via 172.17.10.1 dev eth0 
172.17.10.0/24 dev eth0 scope link  src 172.17.10.2 

dns 配置

bash-5.1# cat /etc/resolv.conf 
nameserver 114.114.114.114

ping 外网、域名不通

bash-5.1# ping 114.114.114.114
PING 114.114.114.114 (114.114.114.114): 56 data bytes
^C
--- 114.114.114.114 ping statistics ---
26 packets transmitted, 0 packets received, 100% packet loss
bash-5.1# curl baidu.com
curl: (6) Could not resolve host: baidu.com

重启网络、docker 服务、重建 docker 网络都不行，实在不知道是哪里问题-_-

[quadrapop]

主机 docker 网络:
docker network ls
NETWORK ID NAME DRIVER SCOPE
3154d2c4d83a bridge bridge local
f97d9dbaf6d4 host host local
ba95ad441d74 none null local

[leonshaw]

iptables?

[quadrapop]

@leonshaw 防火墙没开，也没有 ipatables 服务

[leonshaw]

@quadrapop docker 默认会配 iptables ，想出去至少要有 NAT

[quadrapop]

@leonshaw 按照网上的办法在 docker 内禁用了 iptables 也不行，来来回回重载网络，重启 docker ，删除容器，重新启动容器，不知道怎么回事，配置还是和原来一样，自己好了，里面可以上外网了-_-

[RatioPattern]

以前 centos8 还得配个
```
firewall-cmd --zone=public --add-masquerade --permanent
firewall-cmd reload
service docker restart
```