In order to copy a file from a container to the host, you can use the command docker cp <containerId>:/file/path/within/container /host/path/target Here’s an example: $ sudo docker cp goofy_roentgen:/out_read.jpg . Here goofy_roentgen is the container name I got from the following command: $ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 1b4ad9311e93 … Read more
The docker pause command suspends all processes in the specified containers. On Linux, this uses the cgroups freezer. Traditionally, when suspending a process the SIGSTOP signal is used, which is observable by the process being suspended https://docs.docker.com/engine/reference/commandline/pause/ The docker stop command. The main process inside the container will receive SIGTERM, and after a grace period, … Read more
For me removing the unknown from AppArmor works: sudo aa-remove-unknown
A very common problem can be this: Bind your app inside Docker to 0.0.0.0, not to 127.0.0.1 address to let Docker reach the app inside container. UPD: Don’t try to solve it with docker. There is no docker command to fix that. It strictly depends on the using app, web-framework, etc. Read the manual of … Read more
You cannot remove images having multiple repositories without the force modifier, see Docker docs for more info. docker images REPOSITORY TAG IMAGE ID CREATED SIZE repository/image-name tag a8e6fa672e89 10 days ago 344MB repository2/image-name tag a8e6fa672e89 10 days ago 344MB If you want to do it manually, instead of using the image id to remove the … Read more
Updated answer (Oct 2017) As others mentioned, the Docker API has changed. I’m updating my answer since it’s the one most people will probably look at. docker-compose up -d –scale app=5 Unfortunately, we cannot specify this in a docker-compose.yml file currently (as of version 3.5). Details: They did introduce the scale option for version 2.2 … Read more
docker ps can filter by volume to show all of the containers that mount a given volume: docker ps -a –filter volume=VOLUME_NAME_OR_MOUNT_POINT Reference: https://docs.docker.com/engine/reference/commandline/ps/#filtering
By default, docker container will exit immediately if you do not have any task running on the container. To keep the container running in the background, try to run it with –detach (or -d) argument. For examples: docker pull debian docker run -t -d –name my_debian debian e7672d54b0c2 docker ps -a CONTAINER ID IMAGE COMMAND … Read more
Containers are merely an instance of the image you use to run them. The state of mind when creating a containerized app is not by taking a fresh, clean ubuntu container for instance, and downloading the apps and configurations you wish to have in it, and then let it run. You should treat the container … Read more
You can also use –force , -f Force removal of the image If you use the -f flag and specify the image’s short or long ID, then this command untags and removes all images that match the specified ID. docker rmi -f <image_id> Note: this command removes images being used by containers.