![]() ![]() Either way, you now can keep those containers running at all times. Other than that, the choice between policies can be a bit of a gray area. If you use the unless-stopped option, those containers you manually stop will remain stopped until you manually restart them. If you set the policy to always and you stop ContainerX, should the Docker daemon restart for any reason, ContainX will start back up, even when ContainerY is running. Say you have ContainerX for morning, ContainerY for afternoon, and ContainerZ for evening. For example, you might use particular containers during particular times of the day. If you tend to manually stop containers, this is the Restart Policy you should choose. Why would you choose one over another? The most obvious is the unless-stopped option. Of course, you’d change docker-nginx to the name of the container you’re looking to change. The command for that would be:ĭocker update -restart unless-stopped docker-nginx Say you want to change from always to unless-stopped. If you change your mind about a Restart Policy, you can always use the update command. If you use Docker Compose, you would add a Restart Policy into your YAML file like so: Note: You don’t have to set the – -restart no policy, as that is the default. You can apply whatever Restart Policy you prefer after the –restart option, so: However, if we deploy that container like so, it will always restart:ĭocker run -name docker-nginx -p 8080:80 -d nginx -restart always Should the server go down, or the Docker daemon stop, that container would go down and not automatically restart. The above command would deploy the NGINX container, named docker-nginx, in detached mode with external port 8080 pointing to internal port 80. Without the Restart Policy, our NGINX container deployment would look like this:ĭocker run -name docker-nginx -p 8080:80 -d nginx For this, you’d want to apply the always policy. Let’s say you want to deploy an NGINX container and you want to ensure it always restarts. Restart Policies only apply to containers and no other service or application.Also, if you manually stop a container, the Restart Policy is ignored until the daemon itself is restarted.If a container fails to deploy, the Restart Policy does not come into play. Once a container is successfully running, after 10 seconds the Docker will start monitoring it and will apply the associated Restart Policy. Restart Policies only take effect if a container successfully starts.It is important to understand the following about restart policies: unless-stopped: Always restart the container, unless the daemon is stopped, at which point, the container must be restarted manually.always: Always restart the container if it stops, or is manually stopped due to the daemon stopping.on-failure: Restart the container, only if it exits due to an error. ![]() no: Do not automatically restart the container.These policies are passed through the docker command and dictate how the deployed container will handle a restart. To handle this, Docker has what is called Restart Policies, of which there are four. SEE: Kubernetes: A cheat sheet (free PDF) (TechRepublic) That’s the big question: how do you deploy a Docker container so that it’ll automatically restart after your server is up and running again? It’s much easier than you might think. Whatever the reason, once that server comes back up, unless you’ve deployed the container properly, you’ll have to re-deploy. Or maybe you had a power failure or are migrating hardware. Maybe you’ve upgraded the kernel and need to reboot. ![]() And, if created properly, that container will run without fail. In seconds, you can deploy a container for just about anything. The next SQL Server: Interview with Asad Khan of Microsoftĭocker containers make for a lightning-fast means of rolling out an app or service to your data center. How to set, change, and recover your MySQL root password How to create a virtual machine in Google Cloud Platform For more info, visit our Terms of Use page.ĭata warehouse services: What to consider before choosing a vendor This may influence how and where their products appear on our site, but vendors cannot pay to influence the content of our reviews. We may be compensated by vendors who appear on this page through methods such as affiliate links or sponsored partnerships. ![]() If you need to make sure your Docker containers restart upon failure or system reboot, Jack Wallen has just the option you need to keep those containers running at all times. How to ensure your Docker containers automatically start upon a server reboot ![]()
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