Docker restart container


  • Docker Compose Restart Policies to Manage Docker Containers
  • How to restart single docker container within multiple docker container?
  • How to Use Docker Restart Policies to Keep Containers Running
  • Docker restart container on reboot – Here is how we do it
  • Start, Pause, Restart, Stop, and Delete a Docker Container
  • Docker Compose Restart Policies to Manage Docker Containers

    This is quite simple with the Docker restart policies or a Process Manager. But the better choice is to use the restart policy. Because it specifies how a container restart on exit. At Bobcares, we often get requests to restart Docker on reboot, as a part of our Docker Hosting Support. Today, we will see how our Support Engineers enable restart policy for Docker.

    Snapshot on Docker restart policy The restart policy is part of the container metadata. When we create the container, the metadata gets created. By using the --restart flag we can specify the restart policy for a Docker. The default restart policies are no — This default policy means no automatic restart of the container. Now let us see how to restart the container on reboot. How we configure docker containers to restart on reboot? Our Experts often configure Docker containers to restart on reboot.

    And we always recommend using a restart policy. Alternatively, we can also use a Process Manager for the same purpose. Restart policy to restart Docker on reboot By default, the restart policy in Docker is no. For already created containers, our Support Engineers use docker update to start restart policy. The command appears as, Here dfc0b is the container ID.

    Similarly, for the newly created container, we use the command, This will make Docker restart on reboot. Using Process manager to restart Docker on reboot In some cases, we use a Process Manager in Linux to automatically restart services that fail. Common Process Managers are systemd, supervisor, etc. We can use this in the case of Docker also. We recommend this option only if any outside process depends on the docker container.

    For this, we configure the Process Manager to start the container using the default manual commands. But we do not recommend to use both the restart policy along with the Process Manager. Similarly, it is not advisable to use the Process Manager inside a container. The recommended method is to use Docker restart policy.

    But we may also use the Process Manager in some cases. Today, we also saw how our Support Engineers do this for our customers. Related posts:.

    If you are not aware of how Docker Compose works, you can check out a detailed post about the same. Understand how Docker Compose Works In this post, we will take a look at how to use Docker Compose to restart containers automatically. Basically, each restart policy can help us take care of a particular situation with our Docker containers. Below is a table summarizing the restart policies.

    This is because in a YAML file, a plain no is interpreted as false. Adding the Docker Compose Restart Policy To see one of the policies in action, we will simulate a situation where our Docker container should be restarted.

    In order to do so, we will make a slight change in the NodeJS Application from the previous post. In this context, 0 is the status code and typically means that the application stopped without any issues. Anything greater than 0 as a status code denotes an error status code.

    The first is a Redis container. The second is the NodeJS application. We just want our NodeJS application to use restart: always property. Hence, we add this property under the node-app section.

    This will cause a Docker Compose force rebuild of our application. At this point, if we hit the docker ps command we should see two containers running. As per our application login, the container will exit with status code 0 and the restart policy should kick in. See below screenshot showing the NodeJS application starting up again.

    Also, if we check the running container using docker ps, we can see that the NodeJS Docker Container started recently. Basically, our restart policy is working as expected. Conclusion With this, we have understood the various restart policies successfully. We have also experimented with Docker Compose restart always policy and how it can be leveraged in a real requirement. Typically, web-servers do well to use the restart:always policy. Usually, these applications are public serving and we want them to be always up as much as possible.

    However, worker processes can use restart:on-failure policy. If you have any queries or comments, please sound off in the comments section below. Happy Learning!

    Basically, each restart policy can help us take care of a particular situation with our Docker containers. Below is a table summarizing the restart policies. This is because in a YAML file, a plain no is interpreted as false.

    How to restart single docker container within multiple docker container?

    Adding the Docker Compose Restart Policy To see one of the policies in action, we will simulate a situation where our Docker container should be restarted. In order to do so, we will make a slight change in the NodeJS Application from the previous post. In this context, 0 is the status code and typically means that the application stopped without any issues. Anything greater than 0 as a status code denotes an error status code.

    The first is a Redis container.

    How to Use Docker Restart Policies to Keep Containers Running

    Common Process Managers are systemd, supervisor, etc. We can use this in the case of Docker also. We recommend this option only if any outside process depends on the docker container. For this, we configure the Process Manager to start the container using the default manual commands. But we do not recommend to use both the restart policy along with the Process Manager.

    Similarly, it is not advisable to use the Process Manager inside a container.

    Docker restart container on reboot – Here is how we do it

    The recommended method is to use Docker restart policy. But we may also use the Process Manager in some cases. Today, we also saw how our Support Engineers do this for our customers.

    If the container stops, it will be immediately restarted. You can still manually stop the container with docker stop but Docker will bring it back up next time the daemon restarts.

    As Docker containers are often used for long-running background services, you usually want them to restart whenever anything goes wrong.

    Start, Pause, Restart, Stop, and Delete a Docker Container

    The no policy is best suited to local development use. It can be difficult to decide which restart policy to use.

    An exit code of 1 or higher is interpreted as an error. This matches the Unix handling of exit codes, where only 0 represents a successful execution. Bootstrap systems should always be resilient to multiple invocations. Pass the name of the container to the command.

    You can find container names by running docker ps -a. Restart Loops Docker includes a couple of safeguards against perpetual restart loops. The first is a mandatory time delay before restart policies activate.


    Docker restart container