Question - How do I backup a docker container?

Answered by: Gregory Adams  |  Category: General  |  Last Updated: 27-06-2022  |  Views: 595  |  Total Questions: 13

To backup a data volume you can run a new container using the volume you want to backup and executing the tar command to produce an archive of the volume content as described in the docker user guide. In your particular case, the data volume is used to store the data for a MySQL server. How to Create a Docker Image From a Container Step 1: Create a Base Container. Let's get started by creating a running container. Step 2: Inspect Images. Step 3: Inspect Containers. Step 4: Start the Container. Step 5: Modify the Running Container. Step 6: Create an Image From a Container. Step 7: Tag the Image. Step 8: Create Images With Tags. Backup, restore, or migrate data volumes Launch a new container and mount the volume from the dbstore container. Mount a local host directory as /backup. Pass a command that tars the contents of the dbdata volume to a backup. tar file inside our /backup directory. List Docker Containers As you can see, the image above indicates there are no running containers. To list containers by their ID use –aq (quiet): docker ps –aq. To list the total file size of each container, use –s (size): docker ps –s. To export a container, we use the docker export command. The documentation describes export as follows: docker export – Export a container's filesystem as a tar archive. As we can see, this is just a regular old Linux file system — the BusyBox file system created when running our image, to be precise.

https://stackoverflow.com/questions/19234831/where-are-docker-images-stored-on-the-host-machine

Images are stored inside /var/lib/docker and then under applicable storage driver directory. Storage driver, being used, can be determined by executing docker info command. According to the Docker Getting Started guide "your built image" is "in your machine's local Docker image registry. "

http://mgreau.com/posts/2015/08/26/copy-docker-images-from-one-docker-machine-to-another.html

Export an image from a machine and load it to another machine thought your host export directly the TAR file to your host with the docker client connected to the source machine. and then load this file to the target machine with the docker client connected to the target machine.

https://searchitoperations.techtarget.com/definition/Docker-image

A Docker image is a file, comprised of multiple layers, that is used to execute code in a Docker container. An image is essentially built from the instructions for a complete and executable version of an application, which relies on the host OS kernel.

https://docs.docker.com/compose/gettingstarted/

Get started with Docker Compose Step 1: Setup. Step 2: Create a Dockerfile. Step 3: Define services in a Compose file. Step 4: Build and run your app with Compose. Step 5: Edit the Compose file to add a bind mount. Step 6: Re-build and run the app with Compose. Step 7: Update the application. Step 8: Experiment with some other commands.

https://docs.docker.com/engine/reference/builder/

A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command-line instructions in succession. This page describes the commands you can use in a Dockerfile.

https://linuxhint.com/create_docker_image_from_scratch/

Let's start by creating a folder called MyDockerImage and creating a file hello. cc inside it. $ mkdir MyDockerImage. $ cd MyDockerImage. #include<iostream> using namespace std; $ g++ -o hello -static hello. cc. $. / hello. $touch Dockerfile. FROM scratch. ADD hello / $ docker build --tag hello. $ docker images.

https://docs.docker.com/engine/reference/commandline/push/

Use docker push to share your images to the Docker Hub registry or to a self-hosted one. Refer to the docker tag reference for more information about valid image and tag names. Killing the docker push process, for example by pressing CTRL-c while it is running in a terminal, terminates the push operation.

https://docs.docker.com/config/daemon/

The operating-system independent way to check whether Docker is running is to ask Docker, using the docker info command. You can also use operating system utilities, such as sudo systemctl is-active docker or sudo status docker or sudo service docker status, or checking the service status using Windows utilities.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.0_release_notes/chap

Docker is an open source project that automates the deployment of applications inside Linux Containers, and provides the capability to package an application with its runtime dependencies into a container. It provides a Docker CLI command line tool for the lifecycle management of image-based containers.

https://www.quora.com/We-know-that-docker-use-sub-command-ps-to-list-containers-but-what-does-ps-mea

docker ps is the essential command to list existing docker containers in running state. ps stands for “Process Status”. ps command is used to describe process status is Unix variants of operating systems and docker borrowed the naming convention from there.

https://towardsdatascience.com/15-docker-commands-you-should-know-970ea5203421

docker container kill $(docker ps -q) — Kill all running containers. Then you delete the container with: docker container rm my_container — Delete one or more containers. docker container rm $(docker ps -a -q) — Delete all containers that are not running.

https://docs.docker.com/v17.09/engine/userguide/storagedriver/imagesandcontainers/

To view the approximate size of a running container, you can use the docker ps -s command. Two different columns relate to size. virtual size : the amount of data used for the read-only image data used by the container plus the container's writable layer size.

https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks/

To stop all running containers use the docker container stop command followed by a list of all containers IDs. Once all containers are stopped, you can remove them using the docker container rm command followed by the containers ID list.