Assignment for Docker – Day 1
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What is the diff between docker stop and docker kill?
docker stop: Stop a running container (send SIGTERM, and then SIGKILL after grace period) […] The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL. [emphasis mine]
docker kill: Kill a running container (send SIGKILL, or specified signal) […] The main process inside the container will be sent SIGKILL, or any signal specified with option –signal. [emphasis mine]
What is the diff between docker pause and docker unpause?
The docker unpause command un-suspends all processes in the specified containers. On Linux, it does this using the freezer cgroup.
The docker pause command suspends all processes in the specified containers. On Linux, this uses the freezer cgroup. Traditionally, when suspending a process the SIGSTOP signal is used, which is observable by the process being suspended. With the freezer cgroup the process is unaware, and unable to capture, that it is being suspended, and subsequently resumed. On Windows, only Hyper-V containers can be paused.