docker reminder

docker_reminder.txt

Ideally, go through https://docs.docker.com/engine/userguide/intro/
Its pretty good and steps through many various features.

Ubuntu repositories usually have an old version.
Install latest from https://docs.docker.com/engine/installation/linux/ubuntulinux/

To make it easy to run docker without sudo. Add current user to sudo.
https://docs.docker.com/engine/installation/linux/ubuntulinux/#create-a-docker-group

Run hello-world container.
docker run hello-world

Run Ubuntu container and bash
docker run -it ubuntu bash

Exit ubuntu by typing exit.
This stops the container.

Run
docker ps

No container running.

Running 'docker run -it ubuntu bash' will start a 'new' container.

If you want to run the same previous container
Run

docker ps -a

zubairlk@zubairlk-linux:~$ docker ps -a
CONTAINER ID        IMAGE                               COMMAND                  CREATED             STATUS                      PORTS               NAMES
48b5c757d8e7        ubuntu                              "bash"                   10 seconds ago      Exited (0) 3 seconds ago                        

Using the container id.

docker start 48b5c757d8e7

Then attach to the container

docker attach 48b5c757d8e7
Press enter. You'll be inside bash in the container.

To exit container without killing it,
Press 'CTRL-p CTRL-q'

Docker networking overview is here
https://docs.docker.com/engine/userguide/networking/dockernetworks/

docker run -it ubuntu bash
'CTRL-p CTRL-q'
docker run -it ubuntu bash
'CTRL-p CTRL-q'
docker run -it ubuntu bash
'CTRL-p CTRL-q'
docker run -it ubuntu bash
'CTRL-p CTRL-q'

zubairlk@zubairlk-linux:~$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
dfc1a1e03913        ubuntu              "bash"              4 seconds ago       Up 3 seconds                            big_davinci
8e417d3b2da1        ubuntu              "bash"              11 minutes ago      Up 11 minutes                           naughty_leavitt
f8ecdc6e3089        ubuntu              "bash"              11 minutes ago      Up 11 minutes                           amazing_mestorf
48b5c757d8e7        ubuntu              "bash"              19 minutes ago      Up 13 minutes                           stoic_euclid

zubairlk@zubairlk-linux:~$ docker network inspect bridge 
[
    {
        "Name": "bridge",
        "Id": "31915cf374318877680adae2fe92abbd4928dc026035ea02671cffaf5c85698e",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16"
                }
            ]
        },
        "Internal": false,
        "Containers": {
            "48b5c757d8e7885ca846b518fc8f1b29c74d8fd8ffb6ba05339cef11e15ce34f": {
                "Name": "stoic_euclid",
                "EndpointID": "d360c633be394ab5d219ea86d51c9d5aec1f4150510b75d95e82705488bf929b",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            },
            "8e417d3b2da1af32e5dc833ff4a3ff6e24f85dc3155cc36731286964579fcc04": {
                "Name": "naughty_leavitt",
                "EndpointID": "4b5b84c26c160a7085cbc29033fbaab98d4e4bdec45034a42519074341c6ae9e",
                "MacAddress": "02:42:ac:11:00:04",
                "IPv4Address": "172.17.0.4/16",
                "IPv6Address": ""
            },
            "dfc1a1e03913a164e12b3131b4dfaf61ce6ad523b3a3454f89480dd01f11f93d": {
                "Name": "big_davinci",
                "EndpointID": "8de2bedba4eb604a2e1197b78cf7a74fcf5f074dff84c712c8e65f4d947f7a94",
                "MacAddress": "02:42:ac:11:00:05",
                "IPv4Address": "172.17.0.5/16",
                "IPv6Address": ""
            },
            "f8ecdc6e30897f64e4489c90b40c12495ce21b39dc25085ea6bd2512a88f0f05": {
                "Name": "amazing_mestorf",
                "EndpointID": "2bc9c2a643fb59100288de85e36571065988dfb962724202b05973f44b2c6c34",
                "MacAddress": "02:42:ac:11:00:03",
                "IPv4Address": "172.17.0.3/16",
                "IPv6Address": ""
            }
        },
        "Options": {
            "com.docker.network.bridge.default_bridge": "true",
            "com.docker.network.bridge.enable_icc": "true",
            "com.docker.network.bridge.enable_ip_masquerade": "true",
            "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
            "com.docker.network.bridge.name": "docker0",
            "com.docker.network.driver.mtu": "1500"
        },
        "Labels": {}
    }
]
zubairlk@zubairlk-linux:~$ 


They are all connected to bridge.

You can ping the live containers and their ip addresses.

These containers are very minimal ubuntu and run only bash process.
docker attach a container.
run apt-get update
run apt-get install iputils-ping
Then ping a container from within another container.

Next step Docker volumes. how to manage data sharing etc.
Full doc https://docs.docker.com/engine/userguide/containers/dockervolumes/

Useful part on how to share a folder
https://docs.docker.com/engine/userguide/containers/dockervolumes/#mount-a-host-directory-as-a-data-volume

Basically

docker run -v /Users/<path>:/<container path> 

zubairlk@zubairlk-linux:~$ ls sabaq/
command.txt      punjab_bio_9th                    punjab-math-10th_titles.txt     video-page.php?sid=punjab-biology-9th-1.1
command.txt~     punjab-biology-10th_titles.txt    punjab-math-9th_titles.txt      video-page.php?sid=punjab-biology-9th-1.1
dailymotion      punjab-biology-9th_titles.txt     punjab-physics-10th_titles.txt  videos2.txt
dl               punjab-chemistry-10th_titles.txt  punjab-physics-9th_titles.txt   videos.txt
punjab_bio_10th  punjab-chemistry-9th_titles.txt   sabaq.xml                       videos.txt~

zubairlk@zubairlk-linux:~$ docker run -v /home/zubairlk/sabaq/:/root/sabaq -it ubuntu bash
root@c224a8059ff3:/# ls /root/
.bashrc   .profile  sabaq/    
root@c224a8059ff3:/# ls /root/sabaq/
command.txt                       punjab-chemistry-9th_titles.txt  sabaq.xml
command.txt~                      punjab-math-10th_titles.txt      video-page.php?sid=punjab-biology-9th-1.1
dailymotion                       punjab-math-9th_titles.txt       video-page.php?sid=punjab-biology-9th-1.1&v=b-intro-1
dl                                punjab-physics-10th_titles.txt   videos.txt
punjab-biology-10th_titles.txt    punjab-physics-9th_titles.txt    videos.txt~
punjab-biology-9th_titles.txt     punjab_bio_10th                  videos2.txt
punjab-chemistry-10th_titles.txt  punjab_bio_9th
root@c224a8059ff3:/#

/home/zubairlk/sabaq in my host pc is a shared folder now and mapped to /root/sabaq inside container.