ROCKPro64 - Docker Image



  • Morgens beim Kaffee mal schnell was ausprobieren 🙂

    Das Docker Image vom Kamil auf eine SD-Karte gebügelt. Ab in den ROCKPro64 und starten.

    Docker ?

    rock64@rockpro64:~$ docker
    
    Usage:	docker [OPTIONS] COMMAND
    
    A self-sufficient runtime for containers
    
    Options:
          --config string      Location of client config files (default
                               "/home/rock64/.docker")
      -D, --debug              Enable debug mode
      -H, --host list          Daemon socket(s) to connect to
      -l, --log-level string   Set the logging level
                               ("debug"|"info"|"warn"|"error"|"fatal")
                               (default "info")
          --tls                Use TLS; implied by --tlsverify
          --tlscacert string   Trust certs signed only by this CA (default
                               "/home/rock64/.docker/ca.pem")
          --tlscert string     Path to TLS certificate file (default
                               "/home/rock64/.docker/cert.pem")
          --tlskey string      Path to TLS key file (default
                               "/home/rock64/.docker/key.pem")
          --tlsverify          Use TLS and verify the remote
      -v, --version            Print version information and quit
    
    Management Commands:
      config      Manage Docker configs
      container   Manage containers
      image       Manage images
      network     Manage networks
      node        Manage Swarm nodes
      plugin      Manage plugins
      secret      Manage Docker secrets
      service     Manage services
      stack       Manage Docker stacks
      swarm       Manage Swarm
      system      Manage Docker
      trust       Manage trust on Docker images
      volume      Manage volumes
    
    Commands:
      attach      Attach local standard input, output, and error streams to a running container
      build       Build an image from a Dockerfile
      commit      Create a new image from a container's changes
      cp          Copy files/folders between a container and the local filesystem
      create      Create a new container
      deploy      Deploy a new stack or update an existing stack
      diff        Inspect changes to files or directories on a container's filesystem
      events      Get real time events from the server
      exec        Run a command in a running container
      export      Export a container's filesystem as a tar archive
      history     Show the history of an image
      images      List images
      import      Import the contents from a tarball to create a filesystem image
      info        Display system-wide information
      inspect     Return low-level information on Docker objects
      kill        Kill one or more running containers
      load        Load an image from a tar archive or STDIN
      login       Log in to a Docker registry
      logout      Log out from a Docker registry
      logs        Fetch the logs of a container
      pause       Pause all processes within one or more containers
      port        List port mappings or a specific mapping for the container
      ps          List containers
      pull        Pull an image or a repository from a registry
      push        Push an image or a repository to a registry
      rename      Rename a container
      restart     Restart one or more containers
      rm          Remove one or more containers
      rmi         Remove one or more images
      run         Run a command in a new container
      save        Save one or more images to a tar archive (streamed to STDOUT by default)
      search      Search the Docker Hub for images
      start       Start one or more stopped containers
      stats       Display a live stream of container(s) resource usage statistics
      stop        Stop one or more running containers
      tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
      top         Display the running processes of a container
      unpause     Unpause all processes within one or more containers
      update      Update configuration of one or more containers
      version     Show the Docker version information
      wait        Block until one or more containers stop, then print their exit codes
    
    Run 'docker COMMAND --help' for more information on a command.
    

    Ok, Docker ist installiert und läuft.

    Hello World

    rock64@rockpro64:~$ sudo docker run -t ubuntu:18.04 /bin/echo "Hello World"
    [sudo] password for rock64: 
    Unable to find image 'ubuntu:18.04' locally
    18.04: Pulling from library/ubuntu
    7dc40899884d: Pull complete 
    3c3b1bd6c6b3: Pull complete 
    f2b826692f9c: Pull complete 
    836583884d3e: Pull complete 
    27ede898dd26: Pull complete 
    Digest: sha256:de774a3145f7ca4f0bd144c7d4ffb2931e06634f11529653b23eba85aef8e378
    Status: Downloaded newer image for ubuntu:18.04
    Hello World
    

    Nicht wirklich spannend 😉

    nginx

    rock64@rockpro64:~$ sudo docker run -d --name demo_nginx -p 80:80 nginx
    Unable to find image 'nginx:latest' locally
    latest: Pulling from library/nginx
    8d586fc79193: Pull complete 
    542be7cb76c8: Pull complete 
    4c1ed6d3c37c: Pull complete 
    Digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
    Status: Downloaded newer image for nginx:latest
    0b603cb5fa5b4ebf9113eb916b4dbc3d2cf48db8edf5b744d8b40eb6792b22dc
    

    Jetzt haben wir einen Docker Container mit nginx am Laufen. Mit dem Befehl docker ps kann man sich die laufenden Container anzeigen lassen.

    rock64@rockpro64:~$ sudo docker ps
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
    0b603cb5fa5b        nginx               "nginx -g 'daemon of…"   8 seconds ago       Up 7 seconds        0.0.0.0:80->80/tcp   demo_nginx
    

    Adminstrieren des Docker Containers

    sudo docker exec -it 0b603cb5fa5b bash
    

    und schwupps, sind wir auf der Konsole.

    Mal eben nano nachinstallieren.

     root@0b603cb5fa5b:/# apt-get update
     Get:1 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB]
     Ign:2 http://cdn-fastly.deb.debian.org/debian stretch InRelease               
     Get:3 http://cdn-fastly.deb.debian.org/debian stretch-updates InRelease [91.0 kB]
     Get:4 http://cdn-fastly.deb.debian.org/debian stretch Release [118 kB]               
     Get:5 http://cdn-fastly.deb.debian.org/debian stretch Release.gpg [2434 B]
     Get:6 http://security.debian.org/debian-security stretch/updates/main arm64 Packages [421 kB]
     Get:7 http://cdn-fastly.deb.debian.org/debian stretch-updates/main arm64 Packages [5096 B]
     Get:8 http://cdn-fastly.deb.debian.org/debian stretch/main arm64 Packages [6940 kB]
     Fetched 7672 kB in 3s (1962 kB/s)   
     Reading package lists... Done
     root@0b603cb5fa5b:/# apt-get install nano
     Reading package lists... Done
     Building dependency tree       
     Reading state information... Done
     Suggested packages:
       spell
     The following NEW packages will be installed:
       nano
     0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
     Need to get 474 kB of archives.
     After this operation, 2088 kB of additional disk space will be used.
     Get:1 http://cdn-fastly.deb.debian.org/debian stretch/main arm64 nano arm64 2.7.4-1 [474 kB]
     Fetched 474 kB in 0s (764 kB/s)
     debconf: delaying package configuration, since apt-utils is not installed
     Selecting previously unselected package nano.
     (Reading database ... 7135 files and directories currently installed.)
     Preparing to unpack .../nano_2.7.4-1_arm64.deb ...
     Unpacking nano (2.7.4-1) ...
     Setting up nano (2.7.4-1) ...
     update-alternatives: using /bin/nano to provide /usr/bin/editor (editor) in auto mode
     update-alternatives: warning: skip creation of /usr/share/man/man1/editor.1.gz because associated file /usr/share/man/man1/nano.1.gz (of link group editor) doesn't exist
     update-alternatives: using /bin/nano to provide /usr/bin/pico (pico) in auto mode
     update-alternatives: warning: skip creation of /usr/share/man/man1/pico.1.gz because associated file /usr/share/man/man1/nano.1.gz (of link group pico) doesn't exist
    

    Was müssen wir noch testen? Ob nginx läuft. Dazu im Webbrowser folgendes eingeben

     http://192.168.3.19/
    

    Das ist jetzt die IP-Adresse, mit der mein ROCKPro64 läuft.

    0_1537611422093_nginx.png

    Soweit, sieht das ja brauchbar aus. Mal ein wenig mit rumspielen 🙂

    Docker Befehle

    Stoppen

    rock64@rockpro64:~$ sudo docker stop 0b603cb5fa5b
    0b603cb5fa5b
    

    Starten

    rock64@rockpro64:~$ sudo docker start 0b603cb5fa5b
    0b603cb5fa5b
    

    Und es gibt noch viel mehr da zu entdecken. Wird fortgesetzt......



  • docker info

    root@rockpro64:/usr/local/sbin# docker info
    Containers: 4
     Running: 0
     Paused: 0
     Stopped: 4
    Images: 4
    Server Version: 18.09.3
    Storage Driver: overlay2
     Backing Filesystem: extfs
     Supports d_type: true
     Native Overlay Diff: true
    Logging Driver: json-file
    Cgroup Driver: cgroupfs
    ....
    

    docker image ls

    Vorhandene Images auflisten.

    root@rockpro64:/usr/local/sbin# docker image ls
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    my/nginx            latest              d6d53e05e4c8        45 hours ago        103MB
    nginx               latest              c190496bcbad        3 days ago          103MB
    debian              latest              1c2fcfa9d61f        3 days ago          95.8MB
    ubuntu              18.04               0926e73e5245        2 weeks ago         80.4MB
    

    docker Image temporär starten

    root@rockpro64:~/docker_test# docker run -p 4000:80 friendlyhello
     * Serving Flask app "app" (lazy loading)
     * Environment: production
       WARNING: Do not use the development server in a production environment.
       Use a production WSGI server instead.
     * Debug mode: off
     * Running on http://0.0.0.0:80/ (Press CTRL+C to quit)
    192.168.3.213 - - [30/Mar/2019 17:23:38] "GET / HTTP/1.1" 200 -
    192.168.3.213 - - [30/Mar/2019 17:23:38] "GET /favicon.ico HTTP/1.1" 404 -
    

    docker Image als Daemon starten

     root@rockpro64:~/docker_test# docker run -d -p 4000:80 friendlyhello
     0b9d4c5878b50dca6d820b2597a1c5128c176d7d4f7563d4ecbc8203fd28f8b3


  • Wir verfeinern das Ganze mal. Den Anfang macht der nginx Docker Container 🙂

    Als Basis dient das Docker-Image vom Kamil.

    Software

    Hier die rc5 Version

    root@rockpro64:~# uname -a
    Linux rockpro64 4.4.167-1161-rockchip-ayufan-g6f1664023387 #1 SMP Fri Mar 22 23:03:38 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
    

    nginx

    Container holen

    docker pull nginx
    

    Container starten

    docker run -d -p 80:80 nginx
    

    Docker Status

    root@rockpro64:~# docker ps
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
    ef0c26f78268        nginx               "nginx -g 'daemon of…"   4 minutes ago       Up 4 minutes        0.0.0.0:80->80/tcp   heuristic_mirzakhani
    

    Docker Container betreten

    docker exec -it ef0c26f78268 bash
    

    Danach befindet man sich auf der Konsole, innerhalb des Containers. Dort kann man dann Änderungen vornehmen, nur blöd, das die nicht permanent sind. Dafür muss man noch was machen.

    Den Container, den man sich holt, dient nur als Grundlage. Also die konsole betreten, die Änderungen eintragen. Beispiel:

    apt update
    apt upgrade
    apt install nano
    nano /usr/share/nginx/html/index.html
    

    In der Datei ändern wir folgendes

    <h1>Welcome to nginx! ***TEST***</h1>
    

    Jetzt kann man die Konsole wieder verlassen.

    exit
    

    Wenn man nun den Container stoppen würde und erneut starten würde, wären alle Änderungen weg. Man bekommt immer den Stand, den man sich mittels pull gezogen hat. OK, das kann man aber auch permanent machen.

    docker commit

    root@rockpro64:~# docker commit ef0c26f78268 nginx_test
    

    Mit diesem Befehl erzeuge ich aus dem Container nginx den neuen Container nginx_test mit allen meinen Änderungen. Das sieht man hier

    root@rockpro64:~# docker image ls
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    nginx_test          latest              05b57c23e8c5        32 seconds ago      124MB
    nginx               latest              2ba173e8977e        2 days ago          103MB
    

    Nun stoppt man den ersten Container nginx und startet seinen neuen Container nginx_test, mit allen Änderungen.

    nginx default.conf

    Die findet man unter

    nano /etc/nginx/conf.d/default.conf


  • Das ganze hat einen furchtbar schönen Vorteil. Mal angenommen, ich habe ein NodeBB-Forum in einem Container laufen. Will das Ding updaten und das crasht einfach mal so. Egal, Container stoppen, Container starten und alles läuft wieder.

    Mit dem Commit sichere ich mir dann den Zustand nachdem ich weiß, das alles klappt 🙂


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