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Docker Commands, Help & Tips

Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

$ docker version

Show info like number of containers, etc

$ docker info

WORKING WITH CONTAINERS

Create an run a container in foreground

$ docker container run -it -p 80:80 nginx

Create an run a container in background

$ docker container run -d -p 80:80 nginx

Shorthand

$ docker container run -d -p 80:80 nginx

Naming Containers

$ docker container run -d -p 80:80 --name nginx-server nginx

TIP: WHAT RUN DID

  • Looked for image called nginx in image cache
  • If not found in cache, it looks to the default image repo on Dockerhub
  • Pulled it down (latest version), stored in the image cache
  • Started it in a new container
  • We specified to take port 80- on the host and forward to port 80 on the container
  • We could do "$ docker container run --publish 8000:80 --detach nginx" to use port 8000
  • We can specify versions like "nginx:1.09"

List running containers

$ docker container ls

OR

$ docker ps

List all containers (Even if not running)

$ docker container ls -a

Stop container

$ docker container stop [ID]

Stop all running containers

$ docker stop $(docker ps -aq)

Remove container (Can not remove running containers, must stop first)

$ docker container rm [ID]

To remove a running container use force(-f)

$ docker container rm -f [ID]

Remove multiple containers

$ docker container rm [ID] [ID] [ID]

Remove all containers

$ docker rm $(docker ps -aq)

Get logs (Use name or ID)

$ docker container logs [NAME]

List processes running in container

$ docker container top [NAME]

TIP: ABOUT CONTAINERS

Docker containers are often compared to virtual machines but they are actually just processes running on your host os. In Windows/Mac, Docker runs in a mini-VM so to see the processes youll need to connect directly to that. On Linux however you can run "ps aux" and see the processes directly

IMAGE COMMANDS

List the images we have pulled

$ docker image ls

We can also just pull down images

$ docker pull [IMAGE]

Remove image

$ docker image rm [IMAGE]

Remove all images

$ docker rmi $(docker images -a -q)

TIP: ABOUT IMAGES

  • Images are app bianaries and dependencies with meta data about the image data and how to run the image
  • Images are no a complete OS. No kernel, kernel modules (drivers)
  • Host provides the kernel, big difference between VM

Some sample container creation

NGINX:

$ docker container run -d -p 80:80 --name nginx nginx (-p 80:80 is optional as it runs on 80 by default)

APACHE:

$ docker container run -d -p 8080:80 --name apache httpd

MONGODB:

$ docker container run -d -p 27017:27017 --name mongo mongo

MYSQL:

$ docker container run -d -p 3306:3306 --name mysql --env MYSQL_ROOT_PASSWORD=123456 mysql

CONTAINER INFO

View info on container

$ docker container inspect [NAME]

Specific property (--format)

$ docker container inspect --format '{{ .NetworkSettings.IPAddress }}' [NAME]

Performance stats (cpu, mem, network, disk, etc)

$ docker container stats [NAME]

ACCESSING CONTAINERS

Create new nginx container and bash into

$ docker container run -it --name [NAME] nginx bash
  • i = interactive Keep STDIN open if not attached
  • t = tty - Open prompt

For Git Bash, use "winpty"

$ winpty docker container run -it --name [NAME] nginx bash

Run/Create Ubuntu container

$ docker container run -it --name ubuntu ubuntu

(no bash because ubuntu uses bash by default)

You can also make it so when you exit the container does not stay by using the -rm flag

$ docker container run --rm -it --name [NAME] ubuntu

Access an already created container, start with -ai

$ docker container start -ai ubuntu

Use exec to edit config, etc

$ docker container exec -it mysql bash

Alpine is a very small Linux distro good for docker

$ docker container run -it alpine sh

(use sh because it does not include bash) (alpine uses apk for its package manager - can install bash if you want)

NETWORKING

"bridge" or "docker0" is the default network

Get port

$ docker container port [NAME]

List networks

$ docker network ls

Inspect network

$ docker network inspect [NETWORK_NAME]
("bridge" is default)

Create network

$ docker network create [NETWORK_NAME]

Create container on network

$ docker container run -d --name [NAME] --network [NETWORK_NAME] nginx

Connect existing container to network

$ docker network connect [NETWORK_NAME] [CONTAINER_NAME]

Disconnect container from network

$ docker network disconnect [NETWORK_NAME] [CONTAINER_NAME]

Detach network from container

$ docker network disconnect

IMAGE TAGGING & PUSHING TO DOCKERHUB

tags are labels that point ot an image ID

$ docker image ls

Youll see that each image has a tag

Retag existing image

$ docker image tag nginx btraversy/nginx

Upload to dockerhub

$ docker image push bradtraversy/nginx

If denied, do

$ docker login

Add tag to new image

$ docker image tag bradtraversy/nginx bradtraversy/nginx:testing

DOCKERFILE PARTS

  • FROM - The os used. Common is alpine, debian, ubuntu
  • ENV - Environment variables
  • RUN - Run commands/shell scripts, etc
  • EXPOSE - Ports to expose
  • CMD - Final command run when you launch a new container from image
  • WORKDIR - Sets working directory (also could use 'RUN cd /some/path')
  • COPY # Copies files from host to container

Build image from dockerfile (reponame can be whatever)

From the same directory as Dockerfile

$ docker image build -t [REPONAME] .

TIP: CACHE & ORDER

  • If you re-run the build, it will be quick because everythging is cached.
  • If you change one line and re-run, that line and everything after will not be cached
  • Keep things that change the most toward the bottom of the Dockerfile

EXTENDING DOCKERFILE

Custom Dockerfile for html paqge with nginx

FROM nginx:latest # Extends nginx so everything included in that image is included here
WORKDIR /usr/share/nginx/html
COPY index.html index.html

Build image from Dockerfile

$ docker image build -t nginx-website

Running it

$ docker container run -p 80:80 --rm nginx-website

Tag and push to Dockerhub

$ docker image tag nginx-website:latest btraversy/nginx-website:latest
$ docker image push bradtraversy/nginx-website

VOLUMES

Volume - Makes special location outside of container UFS. Used for databases

Bind Mount -Link container path to host path

Check volumes

$ docker volume ls

Cleanup unused volumes

$ docker volume prune

Pull down mysql image to test

$ docker pull mysql

Inspect and see volume

$ docker image inspect mysql

Run container

$ docker container run -d --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD=True mysql

Inspect and see volume in container

$ docker container inspect mysql

TIP: Mounts

  • You will also see the volume under mounts
  • Container gets its own uniqe location on the host to store that data
  • Source: xxx is where it lives on the host

Check volumes

$ docker volume ls

There is no way to tell volumes apart for instance with 2 mysql containers, so we used named volumes

Named volumes (Add -v command)(the name here is mysql-db which could be anything)

$ docker container run -d --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD=True -v mysql-db:/var/lib/mysql mysql

Inspect new named volume

docker volume inspect mysql-db

BIND MOUNTS

  • Can not use in Dockerfile, specified at run time (uses -v as well)
  • ... run -v /Users/brad/stuff:/path/container (mac/linux)
  • ... run -v //c/Users/brad/stuff:/path/container (windows)

TIP: Instead of typing out local path, for working directory use $(pwd):/path/container - On windows may not work unless you are in your users folder

Run and be able to edit index.html file (local dir should have the Dockerfile and the index.html)

$ docker container run  -p 80:80 -v $(pwd):/usr/share/nginx/html nginx

Go into the container and check

$ docker container exec -it nginx bash
$ cd /usr/share/nginx/html
$ ls -al

You could create a file in the container and it will exiost on the host as well

$ touch test.txt

DOCKER COMPOSE

  • Configure relationships between containers
  • Save our docker container run settings in easy to read file
  • 2 Parts: YAML File (docker.compose.yml) + CLI tool (docker-compose)

1. docker.compose.yml - Describes solutions for

  • containers
  • networks
  • volumes

2. docker-compose CLI - used for local dev/test automation with YAML files

Sample compose file (From Bret Fishers course)

version: '2'

# same as
# docker run -p 80:4000 -v $(pwd):/site bretfisher/jekyll-serve

services:
  jekyll:
    image: bretfisher/jekyll-serve
    volumes:
      - .:/site
    ports:
      - '80:4000'

To run

docker-compose up

You can run in background with

docker-compose up -d

To cleanup

docker-compose down
@Sphinxs

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@Sphinxs Sphinxs commented Aug 15, 2018

Awesome, thanks ( :

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@panyaxbo panyaxbo commented Aug 17, 2018

really helpful

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@porte22 porte22 commented Aug 19, 2018

thank you!!

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@rbsrafa rbsrafa commented Aug 24, 2018

Great job!

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@ashifiqbal2911 ashifiqbal2911 commented Aug 26, 2018

Awesome

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@VisionsOfDrifting VisionsOfDrifting commented Sep 2, 2018

Thank you for the tutorials!

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@sumitmanchanda01 sumitmanchanda01 commented Sep 8, 2018

Thanks Brad !!

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@ohtkenneth ohtkenneth commented Sep 19, 2018

Fantastic tutorial and documentation. Thank you!

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@TechRancher TechRancher commented Oct 3, 2018

Thanks Brad very helpful!

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@zzCOMzz zzCOMzz commented Oct 11, 2018

Thanks Brad, ^^

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@wildcod wildcod commented Oct 18, 2018

thanks

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@AnthD AnthD commented Nov 21, 2018

cheers

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@iskandarsaleh iskandarsaleh commented Dec 14, 2018

nice bro...thanks a lot..!

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@tripu tripu commented Dec 14, 2018

Thanks for this, and for the video tutorials!

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@sami93 sami93 commented Dec 20, 2018

Thanks

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@pratapbunga pratapbunga commented Jan 18, 2019

Ah, life-saver!! Thank you Brad 💯

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@petercr petercr commented Jan 21, 2019

Awesome thanks so much Brad 😎 👍

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@devtechgen devtechgen commented Jan 22, 2019

Thanks a million

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@RyzorBent RyzorBent commented Jan 30, 2019

Great stuff! :)

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@clissmancamacho clissmancamacho commented Feb 17, 2019

Thanks Brad! You Are Amazing!

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@Alhamou Alhamou commented Mar 5, 2019

thank you Brad !! شكراً استاذ براد

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@indefinitus indefinitus commented Mar 11, 2019

Thanks!! 🎉 🎉 🎉

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@rmfranciacastillo rmfranciacastillo commented Mar 15, 2019

This is awesome! Thanks Brad! Really appreciate your work

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@sinovic sinovic commented Mar 15, 2019

Thank you for the tutorials!

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@mlounnaci mlounnaci commented Apr 17, 2019

Great job! Thanks

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@devatsrs devatsrs commented Apr 30, 2019

Great job thanks

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@Nejini Nejini commented May 20, 2019

Saw your video on youtube and started working on docker! Thanks for the video and this help sheet! :)

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@BrianLe1507 BrianLe1507 commented Jul 3, 2019

You save my time. And your video about docker is easy to understand too . Thank so much, Brad.

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@DX9807 DX9807 commented Jul 6, 2019

Thanks Brad, this is awesome ...........

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@sae13 sae13 commented Jul 31, 2019

❤️ ❤️ ❤️ ❤️ ❤️ ❤️ ❤️ ❤️

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@imran-ib imran-ib commented Aug 4, 2019

Thank You....

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@seksitha seksitha commented Aug 8, 2019

Thank you!!!

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@ahmedsadman ahmedsadman commented Aug 9, 2019

In windows, the bind mount can be done like:
docker container run -d -p 8080:80 -v f:/test:/usr/share/nginx/html --name nginx-website nginx

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@Awais-cb Awais-cb commented Aug 19, 2019

Awwwwsome :D

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@efefregene efefregene commented Aug 23, 2019

Salute

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@thearabbit thearabbit commented Sep 19, 2019

I have problem with Volume mongod.conf

docker run --name mongodb -v /data/db:/data/db -v /etc/mongo:/etc/mongo   -p 27017:27017 --restart=always -d mongo:4.0.6 --config /etc/mongo/mongod.conf
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@naveenrawat51 naveenrawat51 commented Oct 27, 2019

Thank you Brad

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@manucho007 manucho007 commented Nov 15, 2019

To mount bind using Docker Toolbox on Windows 10 HomeEdition:

docker run -d --name nginx-website -v //d/dockercode://usr/share/nginx/html -p 8080:80 nginx

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@moeinrahimi moeinrahimi commented Feb 19, 2020

thanks brad

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@nikidev nikidev commented Feb 20, 2020

Thank you Brad !

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@bruno-silva5 bruno-silva5 commented Feb 26, 2020

Thank you a lot, Brad!

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@ZZhilong ZZhilong commented Mar 2, 2020

Thank you Brad till now--2020

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@edvdbl edvdbl commented Apr 27, 2020

Thank you!

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@ablascoa ablascoa commented Apr 28, 2020

thank you!

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@dracorlll dracorlll commented Jul 11, 2020

thank you!!

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@Saspian Saspian commented Jul 25, 2020

Thank you brad!

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@lifeeric lifeeric commented Aug 12, 2020

Updated Version

Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

$ docker version

Show info like number of containers, etc

$ docker info

WORKING WITH CONTAINERS

Create an run a container in foreground

$ docker container run -it -p 80:80 nginx

Create an run a container in background

$ docker container run -d -p 80:80 nginx

Shorthand

$ docker container run -d -p 80:80 nginx

Naming Containers

$ docker container run -d -p 80:80 --name nginx-server nginx

TIP: WHAT RUN DID

  • Looked for image called nginx in image cache
  • If not found in cache, it looks to the default image repo on Dockerhub
  • Pulled it down (latest version), stored in the image cache
  • Started it in a new container
  • We specified to take port 80- on the host and forward to port 80 on the container
  • We could do "$ docker container run --publish 8000:80 --detach nginx" to use port 8000
  • We can specify versions like "nginx:1.09"

List running containers

$ docker container ls

OR

$ docker ps

List all containers (Even if not running)

$ docker container ls -a

Stop container

$ docker container stop [ID]

Stop all running containers

$ docker stop $(docker ps -aq)

Remove container (Can not remove running containers, must stop first)

$ docker container rm [ID]

To remove a running container use force(-f)

$ docker container rm -f [ID]

Remove multiple containers

$ docker container rm [ID] [ID] [ID]

Remove all containers

$ docker rm $(docker ps -aq)

Get logs (Use name or ID)

$ docker container logs [NAME]

List processes running in container

$ docker container top [NAME]

TIP: ABOUT CONTAINERS

Docker containers are often compared to virtual machines but they are actually just processes running on your host os. In Windows/Mac, Docker runs in a mini-VM so to see the processes youll need to connect directly to that. On Linux however you can run "ps aux" and see the processes directly

IMAGE COMMANDS

List the images we have pulled

$ docker image ls

We can also just pull down images

$ docker pull [IMAGE]

Remove image

$ docker image rm [IMAGE]

Remove all images

$ docker rmi $(docker images -a -q)

TIP: ABOUT IMAGES

  • Images are app bianaries and dependencies with meta data about the image data and how to run the image
  • Images are no a complete OS. No kernel, kernel modules (drivers)
  • Host provides the kernel, big difference between VM

Some sample container creation

NGINX:

$ docker container run -d -p 80:80 --name nginx nginx (-p 80:80 is optional as it runs on 80 by default)

APACHE:

$ docker container run -d -p 8080:80 --name apache httpd

MONGODB:

$ docker container run -d -p 27017:27017 --name mongo mongo

MYSQL:

$ docker container run -d -p 3306:3306 --name mysql --env MYSQL_ROOT_PASSWORD=123456 mysql

CONTAINER INFO

View info on container

$ docker container inspect [NAME]

Specific property (--format)

$ docker container inspect --format '{{ .NetworkSettings.IPAddress }}' [NAME]

Performance stats (cpu, mem, network, disk, etc)

$ docker container stats [NAME]

ACCESSING CONTAINERS

Create new nginx container and bash into

$ docker container run -it --name [NAME] nginx bash
  • i = interactive Keep STDIN open if not attached
  • t = tty - Open prompt

For Git Bash, use "winpty"

$ winpty docker container run -it --name [NAME] nginx bash

Run/Create Ubuntu container

$ docker container run -it --name ubuntu ubuntu

(no bash because ubuntu uses bash by default)

You can also make it so when you exit the container does not stay by using the -rm flag

$ docker container run --rm -it --name [NAME] ubuntu

Access an already created container, start with -ai

$ docker container start -ai ubuntu

Use exec to edit config, etc

$ docker container exec -it mysql bash

Alpine is a very small Linux distro good for docker

$ docker container run -it alpine sh

(use sh because it does not include bash)
(alpine uses apk for its package manager - can install bash if you want)

NETWORKING

"bridge" or "docker0" is the default network

Get port

$ docker container port [NAME]

List networks

$ docker network ls

Inspect network

$ docker network inspect [NETWORK_NAME]
("bridge" is default)

Create network

$ docker network create [NETWORK_NAME]

or

$ docker network create --driver bridge [NETWORK_NAME]

Link to container, add to network

$ docker run -d --net=[NETWORK_NAME] --name mongodb mongo

Create container on network

$ docker container run -d --name [NAME] --network [NETWORK_NAME] nginx

Connect existing container to network

$ docker network connect [NETWORK_NAME] [CONTAINER_NAME]

Disconnect container from network

$ docker network disconnect [NETWORK_NAME] [CONTAINER_NAME]

Detach network from container

$ docker network disconnect

Delete/Remove network

To remove the network by name or id, multiple can be deleted:

$ docker network rm [NETWORK_NAME] [NETWORK_NAME]

IMAGE TAGGING & PUSHING TO DOCKERHUB

tags are labels that point ot an image ID

$ docker image ls

Youll see that each image has a tag

Retag existing image

$ docker image tag nginx btraversy/nginx

Upload to dockerhub

$ docker image push bradtraversy/nginx

If denied, do

$ docker login

Add tag to new image

$ docker image tag bradtraversy/nginx bradtraversy/nginx:testing

DOCKERFILE PARTS

  • FROM - The os used. Common is alpine, debian, ubuntu
  • ENV - Environment variables
  • RUN - Run commands/shell scripts, etc
  • EXPOSE - Ports to expose
  • CMD - Final command run when you launch a new container from image
  • WORKDIR - Sets working directory (also could use 'RUN cd /some/path')
  • COPY # Copies files from host to container

Build image from dockerfile (reponame can be whatever)

From the same directory as Dockerfile

$ docker image build -t [REPONAME] .

Benchmarking builds

$ DOCKER_BUILDKIT=1 docker image build -t [REPONAME] .

TIP: CACHE & ORDER

  • If you re-run the build, it will be quick because everythging is cached.
  • If you change one line and re-run, that line and everything after will not be cached
  • Keep things that change the most toward the bottom of the Dockerfile

EXTENDING DOCKERFILE

Custom Dockerfile for html paqge with nginx

FROM nginx:latest # Extends nginx so everything included in that image is included here
WORKDIR /usr/share/nginx/html
COPY index.html index.html

Build image from Dockerfile

$ docker image build -t nginx-website

Running it

$ docker container run -p 80:80 --rm nginx-website

Tag and push to Dockerhub

$ docker image tag nginx-website:latest btraversy/nginx-website:latest
$ docker image push bradtraversy/nginx-website

VOLUMES

Volume - Makes special location outside of container UFS. Used for databases

Bind Mount -Link container path to host path

Check volumes

$ docker volume ls

Cleanup unused volumes

$ docker volume prune

Pull down mysql image to test

$ docker pull mysql

Inspect and see volume

$ docker image inspect mysql

Run container

$ docker container run -d --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD=True mysql

Inspect and see volume in container

$ docker container inspect mysql

TIP: Mounts

  • You will also see the volume under mounts
  • Container gets its own uniqe location on the host to store that data
  • Source: xxx is where it lives on the host

Check volumes

$ docker volume ls

There is no way to tell volumes apart for instance with 2 mysql containers, so we used named volumes

Named volumes (Add -v command)(the name here is mysql-db which could be anything)

$ docker container run -d --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD=True -v mysql-db:/var/lib/mysql mysql

Inspect new named volume

docker volume inspect mysql-db

BIND MOUNTS

  • Can not use in Dockerfile, specified at run time (uses -v as well)
  • ... run -v /Users/brad/stuff:/path/container (mac/linux)
  • ... run -v //c/Users/brad/stuff:/path/container (windows)

TIP: Instead of typing out local path, for working directory use $(pwd):/path/container - On windows may not work unless you are in your users folder

Run and be able to edit index.html file (local dir should have the Dockerfile and the index.html)

$ docker container run  -p 80:80 -v $(pwd):/usr/share/nginx/html nginx

Go into the container and check

$ docker container exec -it nginx bash
$ cd /usr/share/nginx/html
$ ls -al

You could create a file in the container and it will exiost on the host as well

$ touch test.txt

Link

$ docker run -d --name my-postgres postgres

now Link it with dot net

$ docker run -d -p 5000:5000 --link my-postgres:postgres btree/dotnet

DOCKER COMPOSE

  • Configure relationships between containers
  • Save our docker container run settings in easy to read file
  • 2 Parts: YAML File (docker.compose.yml) + CLI tool (docker-compose)

1. docker.compose.yml - Describes solutions for

  • containers
  • networks
  • volumes

2. docker-compose CLI - used for local dev/test automation with YAML files

Sample compose file (From Bret Fishers course)

version: '2'

# same as
# docker run -p 80:4000 -v $(pwd):/site bretfisher/jekyll-serve

services:
  jekyll:
    image: bretfisher/jekyll-serve
    volumes:
      - .:/site
    ports:
      - '80:4000'

Example 2

version: '3'
services:
  app:
    container_name: docker-node-mongo
    restart: always
    build: .
    ports:
      - '80:3000'
    links:
      - mongo
  mongo:
    container_name: mongo
    image: mongo
    ports:
      - '27017:27017'

To run

docker-compose up

You can run in background with

docker-compose up -d

To cleanup

docker-compose down
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