![]() ![]() Unlike VMs or physical servers that require special attention, containers can be spun up, replicated, destroyed and managed with much greater flexibility. Unlike a pet that requires love, attention and more money than you ever wanted to spend, your infrastructure should be made up of components you can treat like cattle – self-sufficient, easily replaced and manageable by the hundreds or thousands. One by one, all the container IDs will appear as Docker restarts them: rootxps: docker start (docker ps -a -q -f statusexited) 014a746dbb9d 080cf6412ac4. Now all we have left to do is pass the above command to the docker start, like shown below. Simply put, the “cattle not pets” mantra suggests that work shouldn’t grind to a halt when a piece of infrastructure breaks, nor should it take a full team of people (or one specialized owner) to nurse it back to health. Restart all the Stopped Containers in Docker. Treat your containers like cattle not pets: Think of it like it's a single application - if it breaks, restart the whole dang thing. You're treating the container like a server where you go in and fix things that break. occasionally I need to restart Apache on the container (WordPress).ĭon't do that. ![]() I've managed to install the services by adding them to my Dockerfile but can't figure out how to get these services to run when the container is restart.īelow are the contents for relevant files:ĭockerfile: FROM wordpress:5.1-php7.3-apache I found that after rebooting the box, I would have 15 or so slightly-differing versions of the app running simultaneously, which is not the intention. Secondly, I would like to configure my Dockerfile or docker-compose.yml (not sure where I'm supposed to be adding this) so that this behaviour is baked in to the container/image when it is built. This means that Docker is being notified of a restart policy for each container. I would like to know how to always run these commands when apache2 is restart. The two commands I need to run are: service memcached start My first problem is that there are two other services that I need to run for my project to work correctly and these don't automatically restart when I run the above service apache2 restart command. Docker provides restart policies to control whether your containers start automatically when they exit, or when Docker restarts. I've been provided with a Dockerfile and docker-compose.yml and have successfully got the images built and container up and running (by running docker-compose up -d), but I would like to update things to make my process a bit easier as occasionally I need to restart Apache on the container (WordPress) by accessing it using: docker exec -it 89a145b5ea3e /bin/bash The status of the stopped container would display as Exited. However, How to monitor, if/when there is a failed. Container Stop/Restart procedure To verify if the container has stopped run docker ps -a command. I'm new to using Docker and docker-compose so apologies if I have some of the terminology wrong. TABLE 7.3 Docker Restart Policy Policy no onfailure:maxretries always unlessstopped Result This setting will not automatically restart the container. How to detect Docker containers that are NOT restarting i.e. ![]()
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