Docker Basic Setup: Difference between revisions

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docker exec -it container(id|name) /bin/bash
docker exec -it container(id|name) /bin/bash
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=== Volumes management ===
* Docker:  [https://docs.docker.com/storage/volumes/ '''Manuals''' > Docker Engine > Storage > '''Volumes''']
* Docker:  [https://docs.docker.com/compose/compose-file/07-volumes/ Reference > '''Compose file reference''' > Compose specification > Volumes top-level element]
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docker volume
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Usage:  docker volume COMMAND
Manage volumes
Commands:
  create      Create a volume
  inspect    Display detailed information on one or more volumes
  ls          List volumes
  prune      Remove all unused local volumes
  rm          Remove one or more volumes
Run 'docker volume COMMAND --help' for more information on a command.
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docker volume create volume_name
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docker volume ls
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docker volume inspect volume_name
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sudo ls -la /var/lib/docker/volumes/
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docker volume (rm|prune) volume_name
</syntaxhighlight>Note when you are using <code>docker compose</code>, unless specify path in the left side on the ''<code>services:</code>  <code>container-name:</code> <code>volumes:</code>'' section docker will automatically create a volume /var/lib/docker/volumes/ named after the '''container-name''' underscore '''_''' and the name of the '''volume'''.<syntaxhighlight lang="antlr-python" class="code-continue mlw-shell-gray">
example 1
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docker-compose.yml
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<syntaxhighlight lang="yaml" line="1" class="code-continue mlw-shell-gray">
version: "3"
services:
  container-name:
    image: image_name
    volumes:
    - ./base:/data
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The directory used as a volume is "./base" within the current directory where the "docker-compose.yml" is located.
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example 2
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docker-compose.yml
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<syntaxhighlight lang="yaml" line="1" class="code-continue mlw-shell-gray">
version: "3"
services:
  container-name:
    image: image_name
    volumes:
    - base:/data
volumes:
  base:
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<syntaxhighlight lang="bash" class="mlw-pre-wrap">
The directory used as a volume is "/var/lib/docker/volumes/container-name_base/_data" and it will be automatically created unles some additional options are specified within the "volumes:" section.
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Revision as of 10:43, 24 May 2023

Lin­ux Serv­er
Con­tain­ers
De­vOps and SRE

Dock­er In­stal­la­tion Steps

This sec­tion we gives fresh (Feb. 2023) ref­er­ences how to in­stall Dock­er and Dock­er Com­pose plu­g­in v.2.x on Ubun­tu.

Dep­re­cat­ed Dock­er In­stal­la­tion Steps

#Dep­re­cat­ed In­stal­la­tion Steps

In­stall Dock­er

In­stall Dock­er on Ubun­tu and oth­er De­bian based dis­tros.
sudo apt install docker.io curl

sudo usermod -aG docker "$USER"
Ref­er­ences:

In­stall Dock­er Com­pose

More in­for­ma­tion at Get start­ed with Dock­er Com­pose.
# docker-compose from github.com/docker/compose#where-to-get-docker-compose

sudo curl -L --fail \
https://github.com/docker/compose/releases/download/v2.5.0/docker-compose-linux-x86_64 \
-o /usr/local/bin/docker-compose

sudo chmod +x /usr/local/bin/docker-compose

Al­ter­na­tive­ly, for ex­am­ple, one can use Dock­er-com­pose pro­vid­ed by Linuxserver​.io.

#CLI
# docker-compose from linuxserver.io

sudo curl -L --fail \
https://raw.githubusercontent.com/linuxserver/docker-docker-compose/master/run.sh \
-o /usr/local/bin/docker-compose && \
sudo chmod +x /usr/local/bin/docker-compose

Ba­sics Ex­am­ple

Here is a GitHub repos­i­to­ry that il­lus­trates at very ba­sic lev­el how to use Dock­er­file and docler-compose.yaml to de­ploy a Node.js ap­pli­ca­tion.

Mis­cel­la­neous

Prune All

Sim­ple script that will prune all Dock­er con­tain­ers and im­ages that are not in use. If you want to use it, add the script some­where in your $PATH to be ac­ces­si­ble as shell com­mand and make it ex­e­cutable. 

sudo nano /usr/local/bin/docker-prune.sh && sudo chmod +x /usr/local/bin/docker-prune.sh

#!/bin/bash
docker image prune -a
docker container prune
docker images prune
docker system prune

docker volume rm $(docker volume ls -qf dangling=true)

Force up­date ex­ist­ing im­ages with dock­er-com­pose

docker-compose up --force-recreate --build -d
docker image prune -f

Log-in to a Dock­er Con­tain­er

docker exec -it container(id|name) /bin/bash

Gen­er­ate Hashed Pass­word for Code-serv­er

printf 'your-password' | npx argon2-cli -e | sed 's/\$/$$/g'

De­mo App from Nana's Dock­er Tu­to­r­i­al for Be­gin­ners

See al­so


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