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docker_notes:docker [2024-01-14 Sun wk02 12:04] – [DNS and nftable / iptables / netfilter within containers] baumkpdocker_notes:docker [2024-11-10 Sun wk45 12:17] (current) – [Installation] baumkp
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 {{tag>linux docker cli installation network volume iptables nftables portainer}} {{tag>linux docker cli installation network volume iptables nftables portainer}}
-Much of this material was originally sourced from: [[https://github.com/xcad2k/cheat-sheets/blob/main/docker/docker.md|xcad2k cheat-sheets/docker/docker.md]] 
- 
  
 ======Docker====== ======Docker======
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 =====Installation===== =====Installation=====
 +  *[[https://docs.docker.com/engine/install/debian/|Install Docker Engine on Debian]]
 One click installation script: One click installation script:
   *''%%curl -fsSL https://get.docker.com -o get-docker.sh%%''   *''%%curl -fsSL https://get.docker.com -o get-docker.sh%%''
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 Install Docker Engine : [Docker Engine](https://docs.docker.com/engine/install/) Install Docker Engine : [Docker Engine](https://docs.docker.com/engine/install/)
 +
 +====Docker Desktop for Linux====
 +I have preferred to run Docker command as a native Linux applications.  Docker Desktop originally was created to allow operating systems other than Linux to run Docker by creating a virtual Linux machine to operate them within.  Linux does not need this as the various docker programs run natively. A version of Docker Desktop was created for Linux that looks like it has some additional user interface features, but to date I have not wanted to setup an additional VM for this purpose and am happy to continues to use the Linux KVM VM solution.
  
 =====Uninstall===== =====Uninstall=====
 Both the install methods actually use the standard package manager to install docker. Both the install methods actually use the standard package manager to install docker.
-  -''dpkg -l|grep docker'' to check the docker packages actually installed+  -''dpkg -l|grep docker'' to check the docker packages actually installed and **which docker packages and versions are installed**
   -''sudo apt remove docker-ce''   -''sudo apt remove docker-ce''
   -Check the the ''var/lib/docker'' directory, ''sudo du -d 1 -h var/lib/docker''   -Check the the ''var/lib/docker'' directory, ''sudo du -d 1 -h var/lib/docker''
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   * Then remove the agent container: ''%%docker rm portainer_agent%%''   * Then remove the agent container: ''%%docker rm portainer_agent%%''
   * Then pull the latest portainer/agent: ''%%docker pull portainer/agent%%'', default is latest if version is not specified.   * Then pull the latest portainer/agent: ''%%docker pull portainer/agent%%'', default is latest if version is not specified.
-<code yaml>docker run -d   -p 9001:9001   --name portainer_agent   --restart=always \ +<code yaml>docker run -d   -p 9001:9001   --name portainer_agent   --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/docker/volumes:/var/lib/docker/volumes portainer/agent</code> 
--v /var/run/docker.sock:/var/run/docker.sock \ +
--v /var/lib/docker/volumes:/var/lib/docker/volumes \ +
-portainer/agent</code>+
  
-=====Build Images===== 
  
 =====Docker CLI===== =====Docker CLI=====
 +Much of this material was originally sourced from: [[https://github.com/ChristianLempa/cheat-sheets/blob/main/docker/docker.md|cheat-sheets/docker/docker.md]]
  
 **Run Containers** **Run Containers**
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 |''docker volume prune'' | Delete all volumes (not referenced by any container)| |''docker volume prune'' | Delete all volumes (not referenced by any container)|
  
 +====docker ps command====
 +The ''docker ps'' command output is long and often difficult to read on the terminal for this reason.
 +  *''%%docker ps --format 'table {{ .ID }}\t{{.Image}}\t{{ .Names }}'%%''
 +<code>CONTAINER ID   IMAGE                    NAMES</code>
 +  *''%%docker ps -s --format 'table {{ .ID }}\t{{.Status}}\t{{.Image}}\t{{ .Names }}'%%''
 +<code>CONTAINER ID   STATUS                  IMAGE                 NAMES</code>
 +  *''%%docker ps -s --format 'table {{ .ID }}\t{{.Status}}\t{{.Image}}\t{{ .Names }}\t{{.Size}}'%%''
 +<code>CONTAINER ID   STATUS                  IMAGE                 NAMES               SIZE</code>
 +
 +===reference===
 +  *[[https://devdojo.com/bobbyiliev/how-to-change-the-docker-ps-output-format|How to change the docker ps output format]]
 +  *Docker Docs
 +    *[[https://docs.docker.com/reference/cli/docker/container/ls/|docker container ls]]
 +    *[[https://docs.docker.com/storage/storagedriver/#container-size-on-disk|Container size on disk]]
 ====Backup a container==== ====Backup a container====
 Backup docker data from inside container volumes and package it in a tarball archive.\\ Backup docker data from inside container volumes and package it in a tarball archive.\\
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   - Overlay network, an even more obscure network arrangement I know nothing about.   - Overlay network, an even more obscure network arrangement I know nothing about.
   - None network - no assigned network, container has no external network connectivity   - None network - no assigned network, container has no external network connectivity
 +
 +====network troubleshooting====
 +A lot of containers are setup to be small and hence do not include many, if any of the tools required to diagnose problems.  A small docker image ''netshoot'' includes the most common networking tools and when attached to the same docker network can be used to diagnose the network and containers networks thereon.
 +  *''%%docker run --rm --name netshoot --network proxy -it nicolaka/netshoot /bin/bash%%''
 +
 ====Troubleshooting==== ====Troubleshooting====
   *[[https://github.com/nicolaka/netshoot|netshoot: a Docker + Kubernetes network trouble-shooting swiss-army container]] ''%%docker run --name netshoot --rm -it nicolaka/netshoot /bin/bash%%''   *[[https://github.com/nicolaka/netshoot|netshoot: a Docker + Kubernetes network trouble-shooting swiss-army container]] ''%%docker run --name netshoot --rm -it nicolaka/netshoot /bin/bash%%''