15 Docker Tips in 5 Minutes

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$ alias dl='docker ps -l -q' $ docker run ubuntu echo hello world hello world $ dl 1904cf045887 $ docker commit `dl` helloworld fd08a884dc79

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$ docker run -i -t ubuntu bash root@db0c3978abf8:/# apt-get install postgresql Reading package lists... Done Building dependency tree... Done etc., etc., etc. root@db0c3978abf8:/# exit $ docker commit \ -run='{"Cmd":["postgres", "-too -many -opts"]}' \ `dl` postgres 5061b88e4cf0

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# Add the docker group. $ sudo groupadd docker # Add self to the docker group. $ sudo gpasswd -a myusername   docker # Restart the docker daemon $ sudo service docker restart # logout and in again. $ exit

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$ docker rm $(docker ps -a -q)

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$ docker inspect `dl` | \ grep IPAddress | cut -d '"' -f 4 172.17.0.52 $ docker inspect `dl` | \ jq -r '.[0].NetworkSettings.IPAddress' 172.17.0.52

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$ docker run ubuntu env HOME=/ PATH=/usr/local/sbin:/usr/local/bin:/ usr/sbin:/usr/bin:/sbin:/bin container=lxc HOSTNAME=5e1560b7f757

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FROM thelanddownunder MAINTAINER crocdundee # docker build will execute these: RUN apt-get update RUN apt-get install softwares # docker run runs this cmd by default: CMD ["softwares"] •

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$ cat Dockerfile FROM ubuntu CMD ["echo"]

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$ docker run \ imagename \ echo hello hello

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$ ip -4 -o addr show eth0 2: eth0 inet 162.243.139.222/24 $ docker run ubuntu \ ip -4 -o addr show eth0 149: eth0 inet 172.17.0.43/16

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# Connect to the UNIX socket and make # like an HTTP client. $ nc -U //var/run/docker.sock GET /images/json HTTP/1.1 HTTP/1.1 200 OK Content-Type: application/json Date: Tue, 05 Nov 2013 23:18:09 GMT Transfer-Encoding: chunked 16aa [{"Repository":"postgres","Tag":”.........

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# Generate an image dependency diagram  $ docker images -viz | \ dot -Tpng -o docker.png # To see it, run this on the host: $ python -m SimpleHTTPServer # then browse to: # http://machinename:8000/docker.png

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$ sudo su # cd /var/lib/docker # ls -F containers/ graph/ repositories volumes/

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$ cat Dockerfile FROM ubuntu:12.04 MAINTAINER Brian Morearty ... RUN pg_ctl start ... $ docker run -i -t postgresimage bash root@08d363f57161:/# ps aux # Doesn’t show postgres daemon

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# Run a container. Give it a name. $ docker run -d -name loldb loldbimage # Run another. Link it to the first, # using an alias. $ docker run -link /loldb:cheez \ otherimage env CHEEZ_PORT=tcp://172.17.0.8:6379 CHEEZ_PORT_1337_TCP=tcp://172.17.0.8:6379 CHEEZ_PORT_1337_TCP_ADDR=172.17.0.12 CHEEZ_PORT_1337_TCP_PORT=6379 CHEEZ_PORT_1337_TCP_PROTO=tcp •

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