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In the process of using Docker containers, some users will encounter some problems. One of the more common problems is that Docker containers cannot access the external network. This problem mainly involves network settings and Docker configuration. Let’s analyze them one by one below.
1. Network settings
First, we need to ensure that the network settings on the host are normal. In a Linux system, you can use the following command to check whether the network settings of the host are normal:
ping www.baidu.com
If no error message appears, the network settings are normal. If there is an error message, you can troubleshoot through the following steps:
cat /etc/resolv.conf
If the DNS configuration is correct, you should be able to see the correct DNS server address.
iptables -L
If the firewall settings are incorrect, you can solve it by modifying the iptables rules question.
2. Docker configuration
When the network settings are normal, we need to check whether the Docker configuration is correct. The following are some common Docker configuration issues:
If the network mode of the Docker container is "bridge", the container cannot be accessed directly The external network needs to be accessed through the host's network connection. If the container's network mode is "host", the container can directly access the external network.
Each Docker container has an IP address. If the IP address is incorrectly configured, the container will not be able to access the external network. You can use the following command to check the IP address of the container:
docker inspect <container_name>
If the IP address configuration is incorrect, you can use the following command to modify the IP address of the container:
docker network disconnect bridge <container_name> docker network connect bridge --ip <new_ip_address> <container_name>
If the network connection of the Docker container is unstable, you can restart the Docker service through the following command to solve the problem:
systemctl restart docker
Summary
In summary, in When encountering the problem that the Docker container cannot access the external network, we need to check the network settings of the host and the configuration of Docker, including network mode, IP address configuration, and network connection stability. Through the above methods, we can solve the problem of most Docker containers accessing the external network.
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