Monday, 11 February 2019

Aide Memoire - Docker Tinkerings

Writing it down here so that I don't forget .....

A quick run-down of some of my most useful Docker commands: -

See what's running

docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

See what images I have

docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

Run, and pull - if needed, a Docker container

docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:2557e3c07ed1e38f26e389462d03ed943586f744621577a99efb77324b0fe535
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

See what images I have

docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

hello-world         latest              fce289e99eb9        5 weeks ago         1.84kB

See what images I have - without truncation

docker images --no-trunc

REPOSITORY          TAG                 IMAGE ID                                                                  CREATED             SIZE

hello-world         latest              sha256:fce289e99eb9bca977dae136fbe2a82b6b7d4c372474c9235adc1741675f587e   5 weeks ago         1.84kB

See what's running

docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES

3d0a99dfd9a4        hello-world         "/hello"            16 seconds ago      Exited (0) 15 seconds ago                       frosty_hypatia

See what's running - without truncation

docker ps -a --no-trunc

CONTAINER ID                                                       IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
3d0a99dfd9a47cd9e336d56ab2fc83bd78ca80978d971dc276946041fdb40995   hello-world         "/hello"            21 seconds ago      Exited (0) 19 seconds ago                       frosty_hypatia

See what's under the hood - in terms of layers

docker history fce289e99eb9

IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
fce289e99eb9        5 weeks ago         /bin/sh -c #(nop)  CMD ["/hello"]               0B                  
          5 weeks ago         /bin/sh -c #(nop) COPY file:f77490f70ce51da2…   1.84kB              

And with a slightly (!) more advanced Docker image: -

docker run docker/whalesay cowsay boo

Unable to find image 'docker/whalesay:latest' locally
latest: Pulling from docker/whalesay
e190868d63f8: Pull complete 
909cd34c6fd7: Pull complete 
0b9bfabab7c1: Pull complete 
a3ed95caeb02: Pull complete 
00bf65475aba: Pull complete 
c57b6bcc83e3: Pull complete 
8978f6879e2f: Pull complete 
8eed3712d2cf: Pull complete 
Digest: sha256:178598e51a26abbc958b8a2e48825c90bc22e641de3d31e18aaf55f3258ba93b
Status: Downloaded newer image for docker/whalesay:latest

 _____ 
< boo >
 ----- 
    \
     \
      \     
                    ##        .            
              ## ## ##       ==            
           ## ## ## ##      ===            
       /""""""""""""""""___/ ===        
  ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~   
       \______ o          __/            
        \    \        __/             
          \____\______/   


docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              fce289e99eb9        5 weeks ago         1.84kB
docker/whalesay     latest              6b362a9f73eb        3 years ago         247MB

docker history 6b362a9f73eb

IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
6b362a9f73eb        3 years ago         /bin/sh -c #(nop) ENV PATH=/usr/local/bin:/u…   0B                  
          3 years ago         /bin/sh -c sh install.sh                        30.4kB              
          3 years ago         /bin/sh -c git reset --hard origin/master       43.3kB              
          3 years ago         /bin/sh -c #(nop) WORKDIR /cowsay               0B                  
          3 years ago         /bin/sh -c git clone https://github.com/moxi…   89.9kB              
          3 years ago         /bin/sh -c apt-get -y update && apt-get inst…   58.6MB              
          3 years ago         /bin/sh -c #(nop) CMD ["/bin/bash"]             0B                  
          3 years ago         /bin/sh -c sed -i 's/^#\s*\(deb.*universe\)$…   1.9kB               
          3 years ago         /bin/sh -c echo '#!/bin/sh' > /usr/sbin/poli…   195kB               
          3 years ago         /bin/sh -c #(nop) ADD file:f4d7b4b3402b5c53f…   188MB         

docker inspect 6b362a9f73eb

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        "RepoTags": [
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        "RepoDigests": [
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        "Parent": "",
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        "ContainerConfig": {
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            "AttachStdin": false,
            "AttachStdout": false,
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            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
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            ],
            "Cmd": [
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            ],
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            "Labels": {}
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        "DockerVersion": "1.6.0",
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            "Cmd": [
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            "Volumes": null,
            "WorkingDir": "/cowsay",
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            "OnBuild": [],
            "Labels": {}
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        "Architecture": "amd64",
        "Os": "linux",
        "Size": 247049019,
        "VirtualSize": 247049019,
        "GraphDriver": {
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]

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