What should I do if the network fails after installing docker?

Docker is currently one of the most popular containerization technologies. It can help us quickly build an environment and improve application deployment efficiency. However, in the process of using Docker, some network problems often occur, such as Docker network failure. So, how to solve these problems?

1. Check the Docker network

First, we need to check whether the Docker network is normal. Run the following command:

docker network ls

If normal, a list of the current Docker network will be printed; if an error occurs, it may be due to incorrect Docker network configuration. You can re-create the Docker default network with the following command:

docker network create --subnet=172.18.0.0/16 --gateway=172.18.0.1 bridge

Then run the docker network ls command again to check whether it is normal.

2. Check the container network

If the Docker network is normal, then you need to check whether the network of the specific container is normal. Run the following command to view the currently running container:

docker ps

Use the container ID or name to enter the container by running the following command:

docker exec -it  /bin/bash

After entering the container, use the following command to check the container's network:

ping <ip></ip>

If it can be pinged successfully, it means that the container network is normal. Otherwise, it may be caused by network configuration errors, network port restrictions, etc., and further investigation is required.

3. Check the network firewall

In addition to the above network configuration issues, it may also be due to the network firewall blocking the connection request of the Docker container. You need to check the network firewall settings of the local computer and open the ports required by Docker. Taking CentOS as an example, you can use the following command to view the current firewall rules:

firewall-cmd --list-all

If you find that the port required by Docker is prohibited by the firewall, you can use the following command to add a rule:

firewall-cmd --zone=public --add-port=8080/tcp --permanent

Reload the firewall rules :

firewall-cmd --reload

Then check again whether the container network is normal.

4. Check the Docker installation

If the above method still cannot solve the problem of Docker network failure, then you need to troubleshoot the problem of the Docker installation itself. You can use the following command to check the Docker version:

docker version

If you find that the Docker version is not the latest version or other abnormalities occur, you can consider reinstalling Docker or upgrading the Docker version.

To sum up, Docker network failure is not a difficult problem to solve. As long as you follow the above steps to check one by one, you can solve the problem of Docker network failure, ensure that the containers can communicate normally, and ensure the normal operation of the application.

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