--- /dev/null
+# Docker
+
+[Docker](https://docs.docker.com/get-started/overview/) is an open platform for developing, shipping, and running applications
+
+## Install Docker
+
+Install [Docker](https://www.docker.com/), by following the instructions relevant to your OS / distribution, and start the service. For example on [Debian](https://docs.docker.com/engine/install/debian/):
+
+```bash
+# update your package lists
+$ sudo apt update
+# remove old versions
+$ sudo apt-get remove docker docker-engine docker.io containerd runc
+# install requirements
+$ sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
+# add docker's GPG signing key
+curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
+# add the repository
+$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
+# install docker engine
+$ sudo apt-get update
+$ sudo apt-get install docker-ce docker-ce-cli containerd.io
+# verify that Docker is properly configured
+root@stretch-shaarli-02:~$ docker run hello-world
+```
+
+
+## Get and run a Shaarli image
+
+Shaarli images are available on [DockerHub](https://hub.docker.com/r/shaarli/shaarli/):
+
+- `latest`: latest branch
+- `master`: master branch
+
+These images are built automatically on DockerHub and rely on:
+
+- [Alpine Linux](https://www.alpinelinux.org/)
+- [PHP7-FPM](http://php-fpm.org/)
+- [Nginx](http://nginx.org/)
+
+Additional Dockerfiles are provided for the `arm32v7` platform, relying on [Linuxserver.io Alpine armhf images](https://hub.docker.com/r/lsiobase/alpine.armhf/). These images must be built using [`docker build`](https://docs.docker.com/engine/reference/commandline/build/) on an `arm32v7` machine or using an emulator such as [qemu](https://resin.io/blog/building-arm-containers-on-any-x86-machine-even-dockerhub/).
+
+```bash
+# download the 'latest' image from dockerhub
+docker pull shaarli/shaarli
+
+# create persistent data volumes/directories on the host
+docker volume create shaarli-data
+docker volume create shaarli-cache
+
+# create a new container using the Shaarli image
+# --detach: run the container in background
+# --name: name of the created container/instance
+# --publish: map the host's :8000 port to the container's :80 port
+# --rm: automatically remove the container when it exits
+# --volume: mount persistent volumes in the container ($volume_name:$volume_mountpoint)
+docker run --detach \
+ --name myshaarli \
+ --publish 8000:80 \
+ --rm \
+ --volume shaarli-data:/var/www/shaarli/data \
+ --volume shaarli-cache:/var/www/shaarli/cache \
+ shaarli/shaarli
+
+# verify that the container is running
+docker ps | grep myshaarli
+
+# to completely remove the container
+docker stop myshaarli # stop the running container
+docker ps | grep myshaarli # verify the container is no longer running
+docker ps -a | grep myshaarli # verify the container is stopped
+docker rm myshaarli # destroy the container
+docker ps -a | grep myshaarli # verify th container has been destroyed
+
+```
+
+## Docker Compose
+
+A [Compose file](https://docs.docker.com/compose/compose-file/) is a common format for defining and running multi-container Docker applications.
+
+A `docker-compose.yml` file can be used to run a persistent/autostarted shaarli service using [Docker Compose](https://docs.docker.com/compose/) or in a [Docker stack](https://docs.docker.com/engine/reference/commandline/stack_deploy/).
+
+Shaarli provides configuration file for Docker Compose, that will setup a Shaarli instance, a [Træfik](https://hub.docker.com/_/traefik/) instance with [Let's Encrypt](https://letsencrypt.org/) certificates, a Docker network, and volumes for Shaarli data and Træfik TLS configuration and certificates.
+
+```bash
+Download docker-compose from the [release page](https://docs.docker.com/compose/install/):
+
+```shell
+$ sudo curl -L "https://github.com/docker/compose/releases/download/1.25.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
+$ sudo chmod +x /usr/local/bin/docker-compose
+# create a new directory to store the configuration:
+$ mkdir shaarli && cd shaarli
+# Download the current version of Shaarli's docker-compose.yml
+$ curl -L https://raw.githubusercontent.com/shaarli/Shaarli/master/docker-compose.yml -o docker-compose.yml
+# Create the .env file and fill in your VPS and domain information
+# (replace <MY_SHAARLI_DOMAIN> and <MY_CONTACT_EMAIL> with your actual information)
+$ echo 'SHAARLI_VIRTUAL_HOST=shaarli.mydomain.org' > .env
+$ echo 'SHAARLI_LETSENCRYPT_EMAIL=admin@mydomain.org' >> .env
+# Pull the Docker images
+$ docker-compose pull
+# Run!
+$ docker-compose up -d
+```
+
+
+
+### Running dockerized Shaarli as a systemd service
+
+It is possible to start a dockerized Shaarli instance as a systemd service (systemd is the service management tool on several distributions). After installing Docker, use the following steps to run your shaarli container Shaarli to run on system start.
+
+As root, create `/etc/systemd/system/docker.shaarli.service`:
+
+```ini
+[Unit]
+Description=Shaarli Bookmark Manager Container
+After=docker.service
+Requires=docker.service
+
+
+[Service]
+Restart=always
+
+# Put any environment you want in an included file, like $host- or $domainname in this example
+EnvironmentFile=/etc/sysconfig/box-environment
+
+# It's just an example..
+ExecStart=/usr/bin/docker run \
+ -p 28010:80 \
+ --name ${hostname}-shaarli \
+ --hostname shaarli.${domainname} \
+ -v /srv/docker-volumes-local/shaarli-data:/var/www/shaarli/data:rw \
+ -v /etc/localtime:/etc/localtime:ro \
+ shaarli/shaarli:latest
+
+ExecStop=/usr/bin/docker rm -f ${hostname}-shaarli
+
+[Install]
+WantedBy=multi-user.target
+```
+
+```bash
+# reload systemd services definitions
+systemctl daemon-reload
+# start the servie and enable it a boot time
+systemctl enable docker.shaarli.service --now
+# verify that the service is running
+systemctl status docker.*
+# inspect system log if needed
+journalctl -f
+```
+
+
+
+## Docker cheatsheet
+
+```bash
+# pull/update an image
+$ docker pull shaarli:release
+# run a container from an image
+$ docker run shaarli:latest
+# list available images
+$ docker images ls
+# list running containers
+$ docker ps
+# list running AND stopped containers
+$ docker ps -a
+# run a command in a running container
+$ docker exec -ti <container-name-or-first-letters-of-id> bash
+# follow logs of a running container
+$ docker logs -f <container-name-or-first-letters-of-id>
+# delete unused images to free up disk space
+$ docker system prune --images
+# delete unused volumes to free up disk space (CAUTION all data in unused volumes will be lost)
+$ docker system prunt --volumes
+# delete unused containers
+$ docker system prune
+```
+
+
+## References
+
+- [Docker: using volumes](https://docs.docker.com/storage/volumes/)
+- [Dockerfile best practices](https://docs.docker.com/articles/dockerfile_best-practices/)
+- [Dockerfile reference](https://docs.docker.com/reference/builder/)
+- [DockerHub: GitHub automated build](https://docs.docker.com/docker-hub/github/)
+- [DockerHub: Repositories](https://docs.docker.com/userguide/dockerrepos/)
+- [DockerHub: Teams and organizations](https://docs.docker.com/docker-hub/orgs/)
+- [Get Docker CE for Debian](https://docs.docker.com/install/linux/docker-ce/debian/)
+- [Install Docker Compose](https://docs.docker.com/compose/install/)
+- [Interactive Docker training portal](https://www.katacoda.com/courses/docker/) on [Katakoda](https://www.katacoda.com/)
+- [Service management: Nginx in the foreground](http://nginx.org/en/docs/ngx_core_module.html#daemon)
+- [Service management: Using supervisord](https://docs.docker.com/articles/using_supervisord/)
+- [Volumes](https://docs.docker.com/storage/volumes/)
+- [Volumes](https://docs.docker.com/userguide/dockervolumes/)
+- [Where are Docker images stored?](http://blog.thoward37.me/articles/where-are-docker-images-stored/)
+- [docker create](https://docs.docker.com/engine/reference/commandline/create/)
+- [Docker Documentation](https://docs.docker.com/)
+- [docker exec](https://docs.docker.com/engine/reference/commandline/exec/)
+- [docker images](https://docs.docker.com/engine/reference/commandline/images/)
+- [docker logs](https://docs.docker.com/engine/reference/commandline/logs/)
+- [docker logs](https://docs.docker.com/engine/reference/commandline/logs/)
+- [Docker Overview](https://docs.docker.com/engine/docker-overview/)
+- [docker ps](https://docs.docker.com/engine/reference/commandline/ps/)
+- [docker pull](https://docs.docker.com/engine/reference/commandline/pull/)
+- [docker run](https://docs.docker.com/engine/reference/commandline/run/)
+- [docker-compose logs](https://docs.docker.com/compose/reference/logs/)
+- Træfik: [Getting Started](https://docs.traefik.io/), [Docker backend](https://docs.traefik.io/configuration/backends/docker/), [Let's Encrypt](https://docs.traefik.io/user-guide/docker-and-lets-encrypt/), [Docker image](https://hub.docker.com/_/traefik/)
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