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Troubleshoot Docker Container Issue.md

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Problem Statement

An issue has arisen with a static website running in a container named nautilus on App Server 1. To resolve the issue, you need to:

  1. Check if the container's volume /usr/local/apache2/htdocs is correctly mapped with the host's volume /var/www/html.
  2. Verify that the website is accessible on host port 8080 on App Server 1. Confirm that the command curl http://localhost:8080/ works on App Server 1.

Solution

1. Check the Running State of the Container

First, verify whether the container named nautilus is running.

  • List the running containers to check if nautilus is among them.

    docker container ls

    This command will display the list of running containers. Look for nautilus in the list.

  • If the container is not running, check all containers, including those that are stopped, to find the nautilus container.

    docker container ls -a

    This command will list all containers, regardless of their state.

  • Start the container if it is not running. Use the container ID or name obtained from the previous command.

    docker container start nautilus

    This command will start the container named nautilus. Replace nautilus with the actual container name or ID if different.

2. Verify the Volume Mapping

Ensure that the container's volume /usr/local/apache2/htdocs is correctly mapped to the host's volume /var/www/html.

  • Inspect the container's details to check volume mappings.

    docker container inspect nautilus

    Look for the Mounts section in the output. You should see something similar to:

    "Mounts": [
    {
        "Type": "bind",
        "Source": "/var/www/html",
        "Destination": "/usr/local/apache2/htdocs",
        "Mode": "",
        "RW": true,
        "Propagation": "rprivate"
    }
]

    Ensure that Source is /var/www/html on the host and Destination is /usr/local/apache2/htdocs in the container.

3. Verify Website Accessibility

Ensure that the website is accessible via the host port 8080.

  • Check the website accessibility by running a curl command on App Server 1.

    curl http://localhost:8080/

    This command should return the content of the static website. If the website is correctly set up, you should see the HTML content or homepage of the website.