What should I do if docker cannot access the external network?

There are two solutions for docker unable to access the external network: 1. Use "service docker stop", "pkill docker" and other operations to rebuild the network docker0; 2. Use "echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf" modify the configuration and enable the host's ipv4 forwarding function.

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

What should I do if docker cannot access the external network?

1. Problem

The host machine can access the external network normally, but it cannot be accessed from the container created by docker External network

2. Solution

Method 1: Rebuild the networkdocker0

sudo service docker stop
sudo pkill docker
sudo iptables -t nat -F
sudo ifconfig docker0 down
sudo brctl delbr docker0
sudo service docker start

Method 2: Enable the host’s ipv4 forwarding function

# 修改配置
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf

# 重启network
systemctl restart network

# 查看 (0->标识未开启 1->标识开启)
sysctl net.ipv4.ip_forward
# net.ipv4.ip_forward = 1

# 重启docker
systemctl restart docker

Recommended study: "docker video tutorial》

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