Povídání pro Tkalce na webu — Michal Valoušek — @msgrehttps://github.com/msgre/docker-talk

Linux + VirtualBox + Vagrant + git

LXC (LinuX Containers) is an operating system–level virtualization method for running multiple isolated Linux systems (containers) on a single control host. AuFS (AnotherUnionFS) is a layered file system, so you can have a read only part, and a write part, and merge those together. So you could have the common parts of the operating system as read only, which are shared amongst all of your containers, and then give each container its own mount for writing. VirtualBox -- izolace. Vagrant -- zpusob ovladani VBoxu. git -- verzovani, repa.

„git“ (poprvé)

$ docker search ubuntu
NAME                                      DESCRIPTION                                     STARS     OFFICIAL   TRUSTED
ubuntu                                    General use Ubuntu base image. Tags availa...   108
stackbrew/ubuntu                          Barebone ubuntu images                          34
# ...
                    

$ docker pull ubuntu
Pulling repository ubuntu
5ac751e8d623: Download complete
9cc9ea5ea540: Download complete
# ...
                    

typy repozitaru

Spuštění kontejneru z image

$ docker run ubuntu echo "hello world"
hello world
                    

$ docker run -i -t ubuntu /bin/bash
root@1d6a233e6896:/$
root@1d6a233e6896:/$ apt-get install nginx
Reading package lists... Done
Building dependency tree... Done
The following extra packages will be installed:
  geoip-database libfreetype6 libgcrypt11 libgd2-noxpm libgeoip1 libgpg-error0 libjpeg-turbo8 libjpeg8 libxml2 libxslt1.1 nginx-common nginx-full sgml-base xml-core
# ...
                    

vysvetlit rozdil mezi image/kontejnerem

„git“ (podruhé)

$ docker commit 1d6a233e6896 msgre/pokus1
1762b9c9158f402f33e7eba64a9a80bb87e4768996d6f8a7b6ea108147693e6c
                    

$ docker push msgre/pokus1
The push refers to a repository [msgre/pokus1] (len: 1)
Sending image list
Pushing repository msgre/pokus1 (1 tags)
511136ea3c5a: Image already pushed, skipping
Image 6170bb7b0ad1 already pushed, skipping
Image 9cd978db300e already pushed, skipping
1762b9c9158f: Image successfully pushed
Pushing tag for rev [1762b9c9158f] on {https://registry-1.docker.io/v1/repositories/msgre/pokus1/tags/latest}
                    

Dockerfile

FROM ubuntu

MAINTAINER Victor Coisne victor.coisne@dotcloud.com

RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update

RUN apt-get install -y memcached

ENTRYPOINT ["memcached"]

USER daemon

EXPOSE 11211
                    

Propojení kontejnerů

# kontejner s Redisem
$ docker run -d -name redis msgre/redis

# kontejner s aplikaci
$ docker run -t -i -link redis:db -name webapp ubuntu /bin/bash

$ root@4c01db0b339c:/$ env
# ...
DB_PORT=tcp://172.17.0.8:6379
DB_PORT_6379_TCP=tcp://172.17.0.8:6379
DB_PORT_6379_TCP_PROTO=tcp
DB_PORT_6379_TCP_ADDR=172.17.0.8
DB_PORT_6379_TCP_PORT=6379
                    

Sdílení složek

# datovy kontejner
$ docker run -v /var/volume1 -name DATA busybox true

# pripojeni k datovemu kontejneru
$ docker run -t -i -volumes-from DATA ubuntu /bin/bash
                    

# nasdileni slozky /var/logs dovnitr kontejneru
$ sudo docker run -t -i -v /var/logs:/var/host_logs:ro ubuntu /bin/bash
                    

POTÍŽE

Díky za pozornost

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