Docker run alpine linux

Docker

The Docker package is in the ‘Community’ repository. See Repositories how to add a repository.

Connecting to the Docker daemon through its socket requires you to add yourself to the `docker` group.

To start the Docker daemon at boot, see Alpine_Linux_Init_System.

rc-update add docker default service docker start

Docker rootless

Docker rootless allows unprivileged users to run the docker daemon and docker containers in user namespaces.

This requires the docker-rootless-extras package (available in community ) and enabling the cgroups service:

Additionally, the /etc/subuid and /etc/subgid files need to be set up as explained in the official documentation.

Docker Compose

‘docker-compose’ is in the ‘Community’ repository starting with Alpine Linux 3.10.

Isolate containers with a user namespace

adduser -SDHs /sbin/nologin dockremap addgroup -S dockremap echo dockremap:$(cat /etc/passwd|grep dockremap|cut -d: -f3):65536 >> /etc/subuid echo dockremap:$(cat /etc/passwd|grep dockremap|cut -d: -f4):65536 >> /etc/subgid

add to /etc/docker/daemon.json

You may also consider these options : ‘

"experimental": false, "live-restore": true, "ipv6": false, "icc": false, "no-new-privileges": false

You’ll find all possible configurations here[1].

Example: How to install docker from Arch

«WARNING: No limit support»

You might encounter this message when executing docker info . To correct this situation, we have to enable the cgroup_enable=memory swapaccount=1

Alpine 3.8

It may not have been the case before, but with Alpine 3.8, you must config cgroups properly

Warning: This seems not to work with Alpine 3.9 and Docker 18.06. Follow the instructions for grub or extlinux below instead.

echo "cgroup /sys/fs/cgroup cgroup defaults 0 0" >> /etc/fstab

Grub

If you use Grub, add the cgroup condition into /etc/default/grub , then upgrade your grub

GRUB_CMDLINE_LINUX_DEFAULT=". cgroup_enable=memory swapaccount=1"

Extlinux

With Extlinux, you add the cgroup condition, but inside of /etc/update-extlinux.conf

default_kernel_opts=". cgroup_enable=memory swapaccount=1"

then update the config and reboot

How to use docker

The best documentation on using Docker and creating containers is at the official docker site. Adding anything to it here would be redundant.

If you create an account at docker.com, you can browse through user images and learn from the syntax in contributed dockerfiles.

Official Docker image files are denoted on the website by a blue ribbon.

See also

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How to create Alpine Container in Docker

Alpine Linux is popular because of its small size and fast speed. On Docker, its image is of few Mbs, hence consuming less space and resources. Users can opt for it to install a web server, database server such as MySQL, and more… It uses its own package manager called apk to install the packages available through its repository. Being lightweight is the reason why many platforms used it to set up container services.

Here in this article, we will see the steps to install Alpine Image on Docker to create a container. However, those who are interested in running the docker service on Alpine Linux can see our article: How to install Docker Engine on Alpine Linux.

Steps to install Alpine on the Docker container

To follow this tutorial, we are assuming you already have Docker service installed on your existing system and now you want to use the same to create a container with Alpine Image.

1. Pull Docker Alpine Image

By default, the minimal Docker image based on Alpine Linux is available in the Docker Hub repository. Hence, we just need to pull and install it to create a container. Here is the command to follow:

2. Check the available images

Let’s check whether the downloaded image is available to create a container or not. For that just run the given command:

3. Create Alpine Linux Container

In the result, you will see the Alpine image you have just pulled from the Docker library. Now, we can create as many containers running with Alpine Linux. Here is the command to create one.

docker run -it --name myalpine -d alpine

In the above command:

—name myalpine is the name of the container we want to create.

alpine is the name of the image we have downloaded

-d is the option to run the container in the background.

To check what are the containers already running on your system, we can use:

4. Connect to Alpine container command line

Now, we have the Alpine Linux container running in the background, let’s connect to its command for issuing commands.

sudo docker exec -it --user root myalpine /bin/sh

Although we have mentioned the particular user in the above command, however, even if you haven’t, by default it will connect using the root user only.

To exit the command line of Alpine, type:

5. Set root password

If you want to set a root password for the Alpine Linux container then after switching to its command line using the previous step, just type:

Enter the new password two times and you are done.

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