Let’s talk about docker+run+error log

Docker run error log

When using Docker for container deployment, we often need to start the container through the docker run command. However, in actual application scenarios, due to various reasons, we may also encounter errors when running the docker run command and cause the container to fail to start. This article will introduce some common docker run errors and explain how to troubleshoot and solve them based on the error logs.

1. Port conflict

The docker run command needs to specify the port number inside the container and the port number mapped to the host. If the port is already used by other services on the host, or the specified port number is already in use, the container cannot be started. At this time, you can use the command docker ps to check whether there is a conflict between the running container and its mapped port, or check whether other programs on the host are using the port.

2. The image does not exist or is inaccessible

When the specified image does not exist or is inaccessible, the docker run command will cause the container to fail to start. At this point, you can use the docker images command to view existing local images, or use the docker pull command to pull the required image from Docker Hub. If there is a problem with the network connection, you can try to check the network connection or change the network environment.

3. File system permission issues

When the container starts, Docker will create a new file system on the host for storage inside the container. If there are permission issues with that file system, the container will fail to start. At this time, you can use the docker logs command to view the Docker logs to check whether there are related permission issues, and use the chown command to change the permissions of the file system.

4. The container already exists

When trying to run the docker run command to start the container, if the container already exists and is running, an error message that the container already exists will be prompted. At this point, you can use the docker stop command to stop the container and the docker rm command to delete the container. You can also use the docker restart command to restart the container.

5. Command syntax error

When running the docker run command, if there is an error in the command syntax, the container will not start. At this time, you can use the --help parameter to view the syntax rules of the command and make corrections according to the error prompts.

Summary

When using Docker for container deployment, starting the container through the docker run command is a very common operation. However, in actual applications, due to various reasons, we may also encounter errors when running the docker run command and cause the container to fail to start. This article introduces some common docker run errors and explains how to troubleshoot and solve them based on the error logs. I hope it will be helpful to everyone.

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