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[[wikipedia:Docker_(software)|Docker]] is a software utility to pack, ship and run any [[container]]s application available since March [[2013]].
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[[wikipedia:Docker_(software)|Docker]] is a software available since 2013 that among other features performs operating-system-level virtualization also known as [[containers|containerization]]
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* [[Google trends]]: https://trends.google.com/trends/explore?date=all&q=Docker
 
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* <code>[[docker --help]]</code>
 
  
 
== Features ==
 
== Features ==
 
Docker offer the following features:
 
Docker offer the following features:
 
* Package an application and its dependencies in a virtual container that can run on any Linux server ([[docker images]])
 
* Package an application and its dependencies in a virtual container that can run on any Linux server ([[docker images]])
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* Pull or push [[docker images]] to a [[container repository]]/[[container registry]] (<code>[[docker pull]]</code><ref>https://docs.docker.com/engine/reference/commandline/pull/</ref>, <code>[[docker push]]</code>). By default docker hub but you can specify any other registry.
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* Pull or push [[docker images]] to a [[container repository]]/container registry (<code>[[docker pull]]</code><ref>https://docs.docker.com/engine/reference/commandline/pull/</ref>, <code>[[docker push]]</code>). By default docker hub but you can specify any other registry.
  
 
== Installing Docker ==
 
== Installing Docker ==
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On macOS you can follow official documentation https://docs.docker.com/docker-for-mac/install/ which requires to create and account to download installer. You can also try:
 
On macOS you can follow official documentation https://docs.docker.com/docker-for-mac/install/ which requires to create and account to download installer. You can also try:
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<code>[[brew cask install docker]]</code> or try to follow https://pilsniak.com/how-to-install-docker-on-mac-os-using-brew/ instructions:
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<code>brew cask install docker</code> or try to follow https://pilsniak.com/how-to-install-docker-on-mac-os-using-brew/ instructions:
 
: <code>brew install docker [[docker-compose]] docker-machine</code>(to install docker and docker-compose)
 
: <code>brew install docker [[docker-compose]] docker-machine</code>(to install docker and docker-compose)
 
: <code>brew cask install virtualbox</code>
 
: <code>brew cask install virtualbox</code>
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: <code>[[docker run]] hello-world</code> (will pull hello-world image and run it on docker)
 
: <code>[[docker run]] hello-world</code> (will pull hello-world image and run it on docker)
  
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=== Ubuntu ===
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On Ubuntu: <code>[[snap]] install docker</code> (officially provided by [[Canonical]])
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* <code>[[apt install docker.io]]</code>
 
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*  <code>[[snap]] install docker</code> (officially provided by [[Canonical]])
 
  
 
=== Binaries ===
 
=== Binaries ===
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Following binaries will be installed: <code>[[docker-init]]</code>, <code>[[docker-proxy]]</code>, <code>docker</code> and <code>[[dockerd]]</code>
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Following binaries will be installed: <code>docker-init</code>, <code>[[docker-proxy]]</code>, <code>docker</code> and <code>[[dockerd]]</code>
  
 
=== Verifying Docker installation ===
 
=== Verifying Docker installation ===
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=== Configuration files ===
 
=== Configuration files ===
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Ubuntu:
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* Ubuntu: <code>/etc/docker/daemon.json</code>
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* <code>[[/etc/docker/daemon.json]]</code> (Ref: https://docs.docker.com/engine/reference/commandline/dockerd/)
 
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* <code>/etc/docker/[[key.json]]</code>
 
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=== Directories ===
 
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[[/var/lib/docker/]] (The Docker daemon was explicitly designed to have exclusive access to)<ref>https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/</ref>
 
  
 
== Docker Releases  ([[Docker Engine release notes]]) ==
 
== Docker Releases  ([[Docker Engine release notes]]) ==
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You can download Docker CE source code from GitHub<ref>https://github.com/docker/docker-ce/releases</ref>.
 
You can download Docker CE source code from GitHub<ref>https://github.com/docker/docker-ce/releases</ref>.
  
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== Docker Command Line ==
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= Docker Command Line =
 
You can read official docker command line documentation in https://docs.docker.com/engine/reference/commandline/docker/. Before being able to run docker commands you will have to install Docker on your machine.
 
You can read official docker command line documentation in https://docs.docker.com/engine/reference/commandline/docker/. Before being able to run docker commands you will have to install Docker on your machine.
  
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== Docker image and container creation ==
 
== Docker image and container creation ==
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* Create a new [[docker image]] base on ''alpine'' linux distribution and login into the new container: <code>[[docker run]] -it alpine sh</code>
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* Create a new docker image base on ''alpine'' linux distribution and login into the new container: <code>[[docker run]] -it alpine sh</code>
 
* Create a new docker image: <code>[[docker build]]</code>
 
* Create a new docker image: <code>[[docker build]]</code>
 
** Create a new docker image by creating a new text file with instructions, usually called <code>[[Dockerfile]]</code><ref>https://docs.docker.com/engine/reference/builder/</ref>: <code>docker build -f /path/to/a/Dockerfile .</code>
 
** Create a new docker image by creating a new text file with instructions, usually called <code>[[Dockerfile]]</code><ref>https://docs.docker.com/engine/reference/builder/</ref>: <code>docker build -f /path/to/a/Dockerfile .</code>
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== Docker Container Operation ==
 
== Docker Container Operation ==
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* '''Start''' an existing container: <code>[[docker start]] CONTAINER_ID OR CONTAINER_NAME</code>. See also <code>[[docker run]]</code> and differences<ref>https://stackoverflow.com/questions/34782678/difference-between-running-and-starting-a-docker-container</ref> and <code>[[docker container start]]</code>
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* '''Start''' an existing container: <code>[[docker start]] CONTAINER_ID OR CONTAINER_NAME</code>. See also <code>[[docker run]]</code> and differences<ref>https://stackoverflow.com/questions/34782678/difference-between-running-and-starting-a-docker-container</ref>.
 
* '''Stop''' an running container: <code>docker stop container_id</code>
 
* '''Stop''' an running container: <code>docker stop container_id</code>
  
 
* '''Show''' only running containers:
 
* '''Show''' only running containers:
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** <code>[[docker container ls]]</code> <ref>https://docs.docker.com/engine/reference/commandline/container_ls/</ref> or <code>[[docker ps]]</code> <ref>https://docs.docker.com/engine/reference/commandline/ps/</ref>. (<code>[[docker container]] ls</code>) introduced in 2017 in [[Docker 1.13]]<ref>https://www.docker.com/blog/whats-new-in-docker-1-13/</ref> (There is no difference between both commands)<ref>https://stackoverflow.com/a/45254760</ref>  
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** <code>[[docker container]] ls</code> <ref>https://docs.docker.com/engine/reference/commandline/container_ls/</ref> or <code>[[docker ps]]</code> <ref>https://docs.docker.com/engine/reference/commandline/ps/</ref>. (<code>[[docker container]] ls</code>) introduced in 2017 in [[Docker 1.13]]<ref>https://www.docker.com/blog/whats-new-in-docker-1-13/</ref> (There is no difference between both commands)<ref>https://stackoverflow.com/a/45254760</ref>  
  
 
* '''Show''' containers (running or not):  
 
* '''Show''' containers (running or not):  
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** <code>[[docker ps]] -a </code>: https://docs.docker.com/engine/reference/commandline/ps/
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** <code>docker ps -a </code>: https://docs.docker.com/engine/reference/commandline/ps/
 
** <code>docker container ls -a </code>. See also <code>[[docker-compose]] ps</code>
 
** <code>docker container ls -a </code>. See also <code>[[docker-compose]] ps</code>
  
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* '''Login'''/[[Connect into a running container]]:
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* '''Login/Connect''' into a running container:
 
** <code>[[docker exec]]<ref>https://docs.docker.com/engine/reference/commandline/exec/</ref> -it <my_container_name> bash</code>
 
** <code>[[docker exec]]<ref>https://docs.docker.com/engine/reference/commandline/exec/</ref> -it <my_container_name> bash</code>
 
** <code>docker exec -it <my_container_name> sh</code>
 
** <code>docker exec -it <my_container_name> sh</code>
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** <code>[[docker run]] -it --user USER_NAME CONTAINER_NAME</code>
 
  
 
*  '''Start''' stopped containers: <code>docker start $(docker ps -a -q -f status=exited)</code>
 
*  '''Start''' stopped containers: <code>docker start $(docker ps -a -q -f status=exited)</code>
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* '''Restart''' all containers: <code>[[docker restart]] $(docker ps -aq)</code> previously <code>docker restart $(docker ps -q)</code><code>-a all -q quiet</code><ref>https://stackoverflow.com/questions/38221463/command-for-restarting-all-running-docker-containers</ref>
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* '''Restart''' all containers: <code>docker restart $(docker ps -aq)</code> previously <code>docker restart $(docker ps -q)</code><code>-a all -q quiet</code><ref>https://stackoverflow.com/questions/38221463/command-for-restarting-all-running-docker-containers</ref>
  
 
* [[Start configuration behavior and restart policy]]<ref>https://docs.docker.com/config/containers/start-containers-automatically/#use-a-restart-policy</ref>  
 
* [[Start configuration behavior and restart policy]]<ref>https://docs.docker.com/config/containers/start-containers-automatically/#use-a-restart-policy</ref>  
  
 
* <code>[[docker container update]]</code>
 
* <code>[[docker container update]]</code>
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* <code>[[docker kill]]</code>
 
  
 
See also: <code>[[docker compose]]</code> and <code>[[docker stack]]</code>
 
See also: <code>[[docker compose]]</code> and <code>[[docker stack]]</code>
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=== Docker Network command line commands ===
 
=== Docker Network command line commands ===
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{{docker network TOC}}
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* <code>[[docker network ls]]</code>
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* <code>docker network -rm</code>
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* <code>docker network inspect</code>
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* Deprecated: <code>[[docker --link]]</code><ref>https://docs.docker.com/network/links/</ref>
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* <code>docker network create NETWORK_NAME</code>
  
 
=== Docker resource limitation ===
 
=== Docker resource limitation ===
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=== Docker: Working with remote repositories/registries ===
 
=== Docker: Working with remote repositories/registries ===
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You will be using mainly the following commands <code>[[docker login]]</code>, <code>[[docker logout]]</code>, <code>[[docker pull]]</code> and <code>docker push</code>. Docker registry allow to configure notifications. <ref>https://docs.docker.com/registry/notifications/</ref>. Docker has a public repository called Docker Hub and cloud providers offer repositories services such as AWS Elastic Container Registry (ECR).
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You will be using mainly the following commands <code>[[docker login]]</code>, <code>docker logout</code>, <code>[[docker pull]]</code> and <code>docker push</code>. Docker registry allow to configure notifications. <ref>https://docs.docker.com/registry/notifications/</ref>. Docker has a public repository called Docker Hub and cloud providers offer repositories services such as AWS Elastic Container Registry (ECR).
  
 
=== Docker Information ===
 
=== Docker Information ===
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* <code>docker system events</code> https://docs.docker.com/v17.12/edge/engine/reference/commandline/system_events/
 
* <code>docker system events</code> https://docs.docker.com/v17.12/edge/engine/reference/commandline/system_events/
 
* <code>[[docker system df]]</code>
 
* <code>[[docker system df]]</code>
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* <code>[[docker top]][CONTAINER_NAME or CONTAINER_ID]</code> https://docs.docker.com/engine/reference/commandline/top/
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* <code>docker top [CONTAINER_NAME or CONTAINER_ID]</code> https://docs.docker.com/engine/reference/commandline/top/
 
* <code>[[docker inspect]] CONTAINER_ID|IMAGE_ID</code><ref>http://manpages.ubuntu.com/manpages/disco/man1/docker-inspect.1.html</ref> https://docs.docker.com/engine/reference/commandline/inspect/ also available for: container, image, volume, network, node, service, or task
 
* <code>[[docker inspect]] CONTAINER_ID|IMAGE_ID</code><ref>http://manpages.ubuntu.com/manpages/disco/man1/docker-inspect.1.html</ref> https://docs.docker.com/engine/reference/commandline/inspect/ also available for: container, image, volume, network, node, service, or task
 
* <code>[[docker images]]</code>,  <code>[[docker images]] -q</code>
 
* <code>[[docker images]]</code>,  <code>[[docker images]] -q</code>
 
* <code>[[docker image inspect]]</code><ref>https://docs.docker.com/engine/reference/commandline/image_inspect/</ref>
 
* <code>[[docker image inspect]]</code><ref>https://docs.docker.com/engine/reference/commandline/image_inspect/</ref>
 
* <code>[[docker image ls]]</code> or <code>[[docker image ls]] --no-trunc </code>
 
* <code>[[docker image ls]]</code> or <code>[[docker image ls]] --no-trunc </code>
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* <code>[[docker volume ls]]</code>
 
 
* <code>[[docker history]] IMAGE</code>
 
* <code>[[docker history]] IMAGE</code>
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* <code>[[docker ps]]</code>
 
  
 
=== Docker Operation ===
 
=== Docker Operation ===
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* <code>[[systemd-cgtop]]</code>
 
* <code>[[systemd-cgtop]]</code>
  
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=== [[Docker Swarm]] ===
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=== Docker Swarm ===
 
{{docker swarm TOC}}
 
{{docker swarm TOC}}
 
* <code>[[docker service create]]</code>
 
* <code>[[docker service create]]</code>
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=== [[Docker Volumes]] ===
 
=== [[Docker Volumes]] ===
 
{{docker volumes}}
 
{{docker volumes}}
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Related terms: [[Bind Mounts]]
 
  
 
=== Secrets ===
 
=== Secrets ===
 
* <code>[[docker secrets]]</code> (Feb 2017)<ref>https://www.docker.com/blog/docker-secrets-management/</ref> ([[swarm]] mode only)
 
* <code>[[docker secrets]]</code> (Feb 2017)<ref>https://www.docker.com/blog/docker-secrets-management/</ref> ([[swarm]] mode only)
  
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== [[Docker logging]] ==
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== Docker logging ==
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Docker support logging to format or different platforms, such as, json-file, syslog, journald, gelf, fluentd, awslogs, splunk, etwlogs, gcplogs and logentries.<ref>https://docs.docker.com/config/containers/logging/configure/</ref>
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* Configuration is done at docker container start time with command <code>docker run -it --log-drive LOG_METHOD CONTAINER_ID</code>
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* Check method configured in a running container:
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** <code>docker inspect -f '{{.HostConfig.LogConfig.Type}}' CONTAINER_ID</code>
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** <code>docker inspect -f '{{.HostConfig.LogConfig}}' CONTAINER_ID</code>
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* View [[logs]]
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:<code>[[docker logs]] CONTAINER_NAME_OR_ID</code> (Docker Community Engine only support: local, json-file and [[journald]])
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:<code>[[docker logs]] CONTAINER_NAME_OR_ID</code> 2>&1 | grep "STRING_TO_SEARCH"</code> (You will need to redirect outputs to be able to grep output)<ref>https://stackoverflow.com/questions/34724980/finding-a-string-in-docker-logs-of-container</ref>
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:See https://docs.docker.com/config/containers/logging/ for more information
  
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== Related terms==
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== Misc ==
 
* <code>[[DevOps/Docker/docker tag|docker tag]]</code><ref>https://docs.docker.com/engine/reference/commandline/tag/</ref>
 
* <code>[[DevOps/Docker/docker tag|docker tag]]</code><ref>https://docs.docker.com/engine/reference/commandline/tag/</ref>
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* <code>[[docker registry]]</code>
 
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* [[OverlayFS]]
 
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* [[Docker Enterprise]] (2017)
 
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* [[Docker Desktop on Windows]] ~ 500 MB
 
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* [[Benjamin Golub]]
 
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* [[Docker download rate limit]] <ref>https://docs.docker.com/docker-hub/download-rate-limit/</ref>
 
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* [[Docker Swarm]], [[Docker Scout]]
 
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* <code>[[crane]]</code> tool for interacting with [[remote images]] and [[registries]].
 
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* [[systemctl restart]]
 
  
 
== Activities ==
 
== Activities ==
 
# Read docker blog: https://blog.docker.com/
 
# Read docker blog: https://blog.docker.com/
 
# Read [[Docker Engine release notes]] (2017) and [[Docker CE]] or [[Docker EE]] releases.
 
# Read [[Docker Engine release notes]] (2017) and [[Docker CE]] or [[Docker EE]] releases.
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# Understand the difference between an [[docker image|image]] and a container, Docker Images vs. Containers: https://stackoverflow.com/a/26960888
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# Understand the difference between an image and a container, Docker Images vs. Containers: https://stackoverflow.com/a/26960888
 
# Understand the difference between <code>[[docker start]]</code> and <code>[[docker run]]</code>: https://stackoverflow.com/questions/34782678/difference-between-running-and-starting-a-docker-container. See also [[runC]]
 
# Understand the difference between <code>[[docker start]]</code> and <code>[[docker run]]</code>: https://stackoverflow.com/questions/34782678/difference-between-running-and-starting-a-docker-container. See also [[runC]]
 
# Read Stackoverflow questions related to docker: https://stackoverflow.com/questions/tagged/docker?tab=Votes
 
# Read Stackoverflow questions related to docker: https://stackoverflow.com/questions/tagged/docker?tab=Votes
 
# Read about Docker Image Manifest Version 2, Schema 2: https://github.com/docker/distribution/blob/fda42e5ef908bdba722d435ff1f330d40dfcd56c/docs/spec/manifest-v2-2.md
 
# Read about Docker Image Manifest Version 2, Schema 2: https://github.com/docker/distribution/blob/fda42e5ef908bdba722d435ff1f330d40dfcd56c/docs/spec/manifest-v2-2.md
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# Duplicate and image using <code>[[docker commit]]</code> command
 
  
 
== See also ==
 
== See also ==
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* {{docker cmd}}
 
 
* {{Docker}}
 
* {{Docker}}
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* {{Dockerd}}
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* [[wikipedia:Docker (software)| Docker Hub]] official Docker container image [[registry]]
 
* {{docker-compose}}
 
* {{docker-compose}}
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* {{dev}}
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* [[Elastic Container Service]] ([[ECS]])
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* AWS Elastic Container Registry ([[ECR]])
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* {{K8s}}
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* {{container orchestration}}
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* {{Virtualization}}
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{{CC license}}
 
{{CC license}}
 
Source: https://en.wikiversity.org/wiki/DevOps/Docker
 
Source: https://en.wikiversity.org/wiki/DevOps/Docker
  
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[[Category:Cloud computing]]
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[[Category:Software development]]
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[[Category:Server administration]]
 
[[Category:Docker]]
 
[[Category:Docker]]
 
[[Category:Linux containers]]
 
[[Category:Linux containers]]

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