The document provides an overview of Docker, explaining its functionalities, components, and installation procedures. It details how to manage Docker containers and images, including commands for running, listing, and configuring containers. Additionally, it highlights the importance of Docker's layer system and resources for further information.

1. Docker
Kamil y3ti Grabowski
UW@IT- 25.02.2015

4. DOCKER Czym jest?
• nowa „seksi” technologia?
• tak, ale działająca również na starym sprzęcie! (kernel 3.8)
• chroot, bsd jail oraz solaris zones również działały!
• oczywiście, ale:
• docker images
• warstwowy system plików
• docker hub
• docker registry
• HTTP REST like API
• biblioteki dla większości popularnych języków
programowania

5. DOCKER vs VIRTUAL MACHINE
Hardware
Host OS
Hypervisor
Guest OS
Bin/Libs
APP
Guest OS
Bin/Libs
APP
Guest OS
Bin/Libs
DB
Hardware
Host OS
Bin/Libs
APP APP
Bin/Libs
DB
Docker
Virtual Machine

6. DOCKER Jak to działa?
• lxc - LinuX Containers
• linux namespaces (pid, net, mnt, ipc, uts)
• cgroups (przypisywanie procesów do grup, kontrola
zasobów, limity)
• union filesystem
• format kontenerów (libcontainer oraz lxc)

7. DOCKER Gdzie on jest?

8. DOCKER Instalacja
# apt-get install docker.io
Instalacja z oficjalnego repozytorium ubuntu
# apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-
keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
# echo "deb https://get.docker.com/ubuntu docker main"
> /etc/apt/sources.list.d/docker.list
# apt-get update
# apt-get install lxc-docker
Instalacja z 3rd-party repozytorium dockera
więcej informacji w dokumentacji:
https://docs.docker.com/installation/#installation

9. DOCKER Pobieranie obrazu aplikacji
host # docker pull ubuntu:14.04
511136ea3c5a: Pull complete
511136ea3c5a: Download complete
fa4fd76b09ce: Download complete
1c8294cc5160: Download complete
117ee323aaa9: Download complete
2d24f826cb16: Download complete
Status: Downloaded newer image for ubuntu:14.04
host # docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
ubuntu trusty-20150218.1 2d24f826cb16 2 days ago 188.3 MB
ubuntu latest 2d24f826cb16 2 days ago 188.3 MB
ubuntu 14.04 2d24f826cb16 2 days ago 188.3 MB
ubuntu 14.04.2 2d24f826cb16 2 days ago 188.3 MB
ubuntu trusty 2d24f826cb16 2 days ago 188.3 MB

10. DOCKER Uruchomienie aplikacji bash
host # docker run -ti ubuntu:14.04 /bin/bash
root@749b70696917:/# ps au
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.3 0.3 18168 1912 ? Ss 21:45 0:00 /bin/bash
root 19 0.0 0.2 15568 1136 ? R+ 21:45 0:00 ps au
root@749b70696917:/# exit
exit

11. DOCKER Detach containers
host # docker run -d postgres:latest
Unable to find image 'postgres:latest' locally
429ae004fde9: Pull complete
662027bf7ac7: Downloading [===============> ] 98.63 MB/104.4 MB 2s
52dec81c6cd5: Download complete
9fccd63a9a1f: Download complete
Status: Downloaded newer image for postgres:latest
a2fef904f62d815c7c7f993bff66e82c91608ad12482f2916423c025ae078bb0

12. DOCKER Lista kontenerów
host # docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a2fef904f62d postgres … 1 min… Up 9 min… 5432/tcp sleepy_darwin
host # docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a2fef904f62d postgres … 1 min… Up 9 min… 5432/tcp sleepy_darwin
28ec28d16d57 ubuntu:14 … 30 min… Exited (0) silly_morse
host # docker ps -a -q
a2fef904f62d
28ec28d16d57

13. DOCKER Konfiguracja nazwy i portu tcp
host # docker run -d --name postgres -p 5432:5432 postgres:latest
c3b16d4d682aac528ead5cded3e7c29b32de66101bc9639b05fc45ab02cf338e
host # docker ps
CONTAINER ID IMAGE … PORTS NAMES
c3b16d4d682a postgres:latest … 0.0.0.0:5432->5432/tcp postgres
a2fef904f62d postgres:latest … 5432/tcp sleepy_darwin
host # docker run -d --name postgres02 -P postgres:latest
391390c80134079f40747f34c240218b9f4c06c5b6537048ab795ebc89cd01d9
host # docker ps
CONTAINER ID IMAGE … PORTS NAMES
391390c80134 postgres:latest … 0.0.0.0:49153->5432/tcp postgres02
c3b16d4d682a postgres:latest … 0.0.0.0:5432->5432/tcp postgres
a2fef904f62d postgres:latest … 5432/tcp sleepy_darwin

14. DOCKER exec
host # docker exec -ti postgres /bin/bash
root@38d0dc500374:/# ps auxf
PID TTY STAT TIME COMMAND
14 ? S 0:00 /bin/bash
26 ? R+ 0:00 _ ps axf
1 ? Ss 0:00 postgres
9 ? Ss 0:00 postgres: checkpointer process
10 ? Ss 0:00 postgres: writer process
11 ? Ss 0:00 postgres: wal writer process
12 ? Ss 0:00 postgres: autovacuum launcher process
13 ? Ss 0:00 postgres: stats collector process

15. DOCKER diff
host # docker diff postgres
C /var
C /var/lib
C /var/lib/postgresql
A /var/lib/postgresql/data
C /run
C /run/postgresql
A /run/postgresql/.s.PGSQL.5432
A /run/postgresql/.s.PGSQL.5432.lock
C /root
A /root/.bash_history
C /tmp

16. DOCKER volumes oraz data containers
host # docker rm -f postgres
host # docker create --name postgres_data
-v /var/lib/postgreql/data postgres
4399af09862693f2c0b36e3473c737ac7d4d9e0f7b6301f8715835b1b08ccd6a
host # docker run -d —name postgres
--volumes-from postgres_data postgres
2c0e1e0ab084c886d66358a02c561e1c1d7a7b47ef5dc7883e493bdba97750fd

17. DOCKER bind volumes
host # docker rm -f postgres
host # docker run -d —name postgres
-v /data/postgresql:/var/lib/postgreql/data postgres
79da06295d684b5b5120e6eddd24d0af38309590ef264b39c741781bdf7a58c4
host # ls /data/postgresql/
base pg_clog pg_hba.conf pg_logical pg_notify
pg_serial pg_stat pg_subtrans pg_twophase pg_xlog
postgresql.conf postmaster.pid global pg_dynshmem
pg_ident.conf pg_multixact pg_replslot pg_snapshots
pg_stat_tmp pg_tblspc PG_VERSION postgresql.auto.conf
postmaster.opts

18. DOCKER operacje na obrazach
• build
• history
• save / load
• images (list images)
• pull / push
• rmi (remove)
• search
• tag

19. DOCKER operacje na kontenerach
• attach / wait
• diff / commit
• cp
• create / run / exec
• export
• inspect
• kill / start / stop / restart
• ps / top
• rename / rm (remove)

20. DOCKER budowanie własnych obrazów
host # ls
Dockerfile
host # cat Dockerfile
FROM ubuntu:14.04
RUN apt-get update
RUN apt-get install -y nginx
EXPOSE 80
EXPOSE 443
CMD ["nginx", "-g", "daemon off;"]
host # docker build -t my-nginx .
host # docker run -d -p 80:80 my-nginx

21. DOCKER co jeszcze warto powiedzieć?
• hub.docker.com
• Własne registry
• Docker events
• HTTP API (json) + biblioteki dla wielu języków
programowania
• CoreOS (docker + etcd + confd + systemd + fleet)
• Fig
• www.dotcloud.com / www.cloud66.com

22. DOCKER Bibliografia
• https://www.docker.com
• instalacja i konfiguracja
• dokumentacja (commandline, API, registry)
• https://hub.docker.com
• http://www.fig.sh
• https://coreos.com

23. Pytania?

24. Dziękuję za uwagę
Kamil y3ti Grabowski