![]() Typically, docker rm is used to remove an already stopped container, but the use of the -f flag will cause it to first issue a SIGKILL. The final option for stopping a running container is to use the -force or -f flag in conjunction with the docker rm command. On the other hand, using docker kill is more like doing a Linux kill -9 or kill -SIGKILL. If no other arguments are specified, the Linux kill command will send a SIGTERM (much like docker stop). Note that the default behavior of the docker kill command is different than the standard Linux kill command it is modeled after. It issues just a single signal (either the default SIGKILL or whatever you specify with the -signal flag). Unlike the docker stop command, kill doesn't have any sort of timeout period. However, it does accept a -signal flag which will let you send something other than a SIGKILL to the container process.įor example, if you wanted to send a SIGINT (the equivalent of a Ctrl-C on the terminal) to the container "foo" you could use the following: docker kill -signal=SIGINT foo When using docker stop the only thing you can control is the number of seconds that the Docker daemon will wait before sending the SIGKILL: docker stop -time=30 fooīy default, the docker kill command doesn't give the container process an opportunity to exit gracefully - it simply issues a SIGKILL to terminate the container. The process never even gets to see the signal. Whereas a process can choose to ignore a SIGTERM, a SIGKILL goes straight to the kernel which will terminate the process. ![]() If the process hasn't exited within the timeout period a SIGKILL signal will be sent. The docker stop command attempts to stop a running container first by sending a SIGTERM signal to the root process (PID 1) in the container. ![]() If you've ever issued a docker stop and had to wait 10 seconds for the command to return you've seen this in action When you issue a docker stop command Docker will first ask nicely for the process to stop and if it doesn't comply within 10 seconds it will forcibly kill it. There are a number of different Docker commands you can use to stop a running container. So, let's look at some of the things you can do to gracefully stop your Docker containers. For those times when you need to stop a running container, it would be preferable if the process could shutdown smoothly instead of abruptly disconnecting users and corrupting files. Things would be easy if you simply started a container and it ran forever, but there's a good chance that your application will need to be stopped and restarted at some point to facilitate an upgrade or a migration to another host.
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