Docker orchestration

1
2015. 5. 28
㈜ 오픈소스컨설팅
김호진,박현익
Using Docker and
How to orchestrate it.

2
Contents
1. Container image 관리
1.1 Docker registry
2. Docker Compose
2.1 Compose install & define the project
2.2 PHP wordpress programming
3. Docker Swarm
2.3 Build by docker file
2.4 Docker registry & start by docker-compose
4. Docker Kubernetes

3
yum install docker-registry
Create private Docker registries
Docker local registry 만들기
[root@docker187 ~]# systemctl status docker.service
[root@docker187 ~]# systemctl -l status docker-registry
[root@docker187 ~]# docker login
Username (oscinfra):
WARNING: login credentials saved in /root/.dockercfg.
Login Succeeded
https://registry.hub.docker.com/repos/ [root@docker187 ~]# netstat -ntpl | grep 5000
tcp 0 0 0.0.0.0:5000 0.0.0.0:* LISTEN 729/python
firewall-cmd --zone=public --list-services
firewall-cmd --zone=public --list-ports
firewall-cmd --permanent --zone=public --add-
service=https
firewall-cmd --permanent --zone=public --add-
port=5000/tcp
firewall-cmd --zone=public --add-port=5000/tcp
firewall-cmd –reload
[root@docker187 ~]# nmap localhost
PORT STATE SERVICE
5000/tcp open upnp

4
Root image 가지고 오기
[root@docker188 ~]# docker pull mysql:latest
latest: Pulling from docker.io/mysql
[root@docker188 ~]# docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=qwerqwer -d mysql
d10d4821e9b96f7f1f5065351f83e014f2799bf8b4febc9da6d3573d12f8aa4e
[root@docker188 ~]# docker run --name wordpress-instance --link some-mysql:mysql -p 8000:80 -d wordpress
edb109fc4ba635f77f9e506b786b3b5529f8d6b7fd6a12ab4adb53116907d02e
[root@docker188 ~]# nmap localhost
5000/tcp open upnp
8080/tcp open http-proxy
출처 : http://www.infosiftr.com/2014/11/13/docker-tutorial-wordpress/

5
Install 후 commit작업 실시

6
[root@docker188 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
edb109fc4ba6 wordpress:latest "/entrypoint.sh apac 11 minutes ago Up 11 minutes 0.0.0.0:8080->80/tcp wordpress-instance
d10d4821e9b9 mysql:latest "/entrypoint.sh mysq 13 minutes ago Up 13 minutes 3306/tcp some-mysql
[root@docker188 ~]# docker commit edb109fc4ba6 osc_wordpress
9655c5be2aa9013d72dc4908d38149e9938b03f32039f1bb89fe226ee9478a11
[root@docker188 ~]# docker commit d10d4821e9b9 osc_mysql
d1341c6a3b5860cbb55d08e96e239224786e4c3767294e2d13705609a183f353
[root@docker188 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
osc_mysql latest d1341c6a3b58 About a minute ago 282.9 MB
osc_wordpress latest 9655c5be2aa9 About a minute ago 511.5 MB
docker.io/wordpress latest 2bed879f48b4 44 hours ago 511.5 MB
docker.io/mysql latest ff78d9bb5f46 3 days ago 282.9 MB
[root@docker188 ~]# docker ps -a
edb109fc4ba6 wordpress:latest "/entrypoint.sh apac 14 minutes ago Exited (0) 36 seconds ago wordpress-instance
d10d4821e9b9 mysql:latest "/entrypoint.sh mysq 16 minutes ago Exited (0) 34 seconds ago some-mysql

7
[root@docker188 ~]# docker stop `docker ps -qa`
[root@docker188 ~]# docker run --name osc_mysql -e MYSQL_ROOT_PASSWORD='qwerqwer' -d osc_mysql
d15491be7bc85bf764f1a2bb2c2b9d7c00e76e1eae476ee572ff52bc609daa68
[root@docker188 ~]# docker run --name osc_wordpress2 --link osc_mysql:mysql -p 8090:80 -d osc_wordpress
12dceb757464a858326658a8c8d26b45d5efa7631d47c7b33ac0bcc14d8bced6
[root@docker188 ~]# docker ps -a
12dceb757464 osc_wordpress:latest "/entrypoint.sh apac 11 seconds ago Up 10 seconds 0.0.0.0:8080->80/tcp osc_wordpress2
d15491be7bc8 osc_mysql:latest "/entrypoint.sh mysq About a minute ago Up About a minute 3306/tcp osc_mysql
edb109fc4ba6 wordpress:latest "/entrypoint.sh apac 17 minutes ago Exited (0) 3 minutes ago wordpress-instance
d10d4821e9b9 mysql:latest "/entrypoint.sh mysq 19 minutes ago Exited (0) 3 minutes ago some-mysql

8
Commit후 private Docker registry에 등록 후 파일 전송
osc_mysql latest 967e48b02b99 2 hours ago 282.9 MB
osc_wordpress latest d590073094fd 2 hours ago 511.5 MB
docker.io/wordpress latest 2bed879f48b4 2 days ago 511.5 MB
[root@docker188 ~]# docker tag osc_mysql:latest localhost:5000/osc/osc_mysql
localhost:5000/osc/osc_mysql latest 967e48b02b99 2 hours ago 282.9 MB
[root@docker188 ~]# docker push localhost:5000/osc/osc_mysql
The push refers to a repository [localhost:5000/osc/osc_mysql] (len: 1)
Sending image list
967e48b02b99: Image successfully pushed
Pushing tag for rev [967e48b02b99] on {http://localhost:5000/v1/repositories/osc/osc_mysql/tags/latest}

9
Commit후 private Docker registry에 등록 후 파일 전송
[root@docker188 ~]# docker tag osc_wordpress localhost:5000/osc/osc_wordpress
localhost:5000/osc/osc_wordpress latest d590073094fd 3 hours ago 511.5 MB
[root@docker188 ~]# docker push localhost:5000/osc/osc_wordpress
The push refers to a repository [localhost:5000/osc/osc_wordpress] (len: 1)
Sending image list
Pushing repository localhost:5000/osc/osc_wordpress (1 tags)
d590073094fd: Image successfully pushed
Pushing tag for rev [d590073094fd] on {http://localhost:5000/v1/repositories/osc/osc_wordpress/tags/latest}

10
Docker Compose
소개
도커 복잡한 응용 프로그램을 정의하고
실행하기위한 도구입니다
멀티 컨테이너를 하나의 파일로 운용
하나의 command로 모든 doker file들 실행

11
Docker compose
Compose install & define the project
[root@docker188 ~]# curl -L https://github.com/docker/compose/releases/download/1.2.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-
compose
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 403 0 403 0 0 343 0 --:--:-- 0:00:01 --:--:-- 343
100 5140k 100 5140k 0 0 1031k 0 0:00:04 0:00:04 --:--:-- 1871k
[root@docker188 ~]# chmod +x /usr/local/bin/docker-compose
[root@docker188 ~]# curl https://wordpress.org/latest.tar.gz | tar -xvzf -
[root@docker188 wordpress]# cat Dockerfile
FROM orchardup/php5
ADD . /code
[root@docker188 wordpress]# cat docker-compose.yml
web:
build: .
command: php -S 0.0.0.0:8000 -t /code
ports:
- "8000:8000"
links:
- db
volumes:
- .:/code
db:
image: orchardup/mysql
environment:
MYSQL_DATABASE: wordpress

12
Docker compose
Php wordpress programming
간단 program
[root@docker01 wordpress]# cat wp-config.php
<?php
define('DB_NAME', 'wordpress');
define('DB_USER', 'root');
define('DB_PASSWORD', '');
define('DB_HOST', "db:3306");
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');
define('AUTH_KEY', 'test');
define('SECURE_AUTH_KEY', 'test');
define('LOGGED_IN_KEY', 'test');
define('NONCE_KEY', 'test');
define('AUTH_SALT', 'test');
define('SECURE_AUTH_SALT', 'test');
define('LOGGED_IN_SALT', 'test');
define('NONCE_SALT', 'test');
$table_prefix = 'wp_';
define('WPLANG', '');
define('WP_DEBUG', false);
if ( !defined('ABSPATH') )
define('ABSPATH', dirname(__FILE__) . '/');
require_once(ABSPATH . 'wp-settings.php');
[root@docker01 wordpress]# cat router.php
<?php
$root = $_SERVER['DOCUMENT_ROOT'];
chdir($root);
$path =
'/'.ltrim(parse_url($_SERVER['REQUEST_URI'])['p
ath'],'/');
set_include_path(get_include_path().':'.__DIR__
);
if(file_exists($root.$path))
{
if(is_dir($root.$path) &&
substr($path,strlen($path) - 1, 1) !== '/')
$path = rtrim($path,'/').'/index.php';
if(strpos($path,'.php') === false) return
false;
else {
chdir(dirname($root.$path));
require_once $root.$path;
}
}else include_once 'index.php';

13
Docker compose
Build by docker file
실행
[root@docker188 wordpress]# docker build -t
oscinfra_web .
Sending build context to Docker daemon 19.79 MB
Sending build context to Docker daemon
Step 0 : FROM orchardup/php5
Trying to pull repository docker.io/orchardup/php5 ...
7113324d9d9e: Download complete
511136ea3c5a: Download complete
e2aa6665d371: Download complete
f0ee64c4df74: Download complete
2209cbf9dcd3: Download complete
5e019ab7bf6d: Download complete
Status: Downloaded newer image for
docker.io/orchardup/php5:latest
---> 7113324d9d9e
Step 1 : ADD . /code
---> 4ea4c8b5cb7f
Removing intermediate container 5ab560447a8b
Successfully built 4ea4c8b5cb7f
[root@docker188 wordpress]# docker images
REPOSITORY TAG
IMAGE ID CREATED VIRTUAL SIZE
oscinfra_web latest
4ea4c8b5cb7f 10 seconds ago 348.9 MB
[root@docker01 wordpress]# docker-compose up
Creating wordpress_db_1...
Pulling image orchardup/mysql:latest...
Pulling repository orchardup/mysql
061b756f7e0d: Download complete
Status: Downloaded newer image for
orchardup/mysql:latest
Creating wordpress_web_1...
Building web...
---> 7113324d9d9e
..
db_1 | 150301 14:54:42 InnoDB: highest
supported file format is Barracuda.
db_1 | 150301 14:54:42 InnoDB: Waiting for
the background threads to start
db_1 | 150301 14:54:43 InnoDB: 5.5.38 started;
log sequence number 1595675
db_1 | 150301 14:54:43 [Note] Server hostname
(bind-address): '0.0.0.0'; port: 3306
db_1 | 150301 14:54:43 [Note] - '0.0.0.0'
resolves to '0.0.0.0';
db_1 | 150301 14:54:43 [Note] Server socket
created on IP: '0.0.0.0'.

14
Docker compose
Docker registry & start by docker-compose
실행
[root@docker188 wordpress]# docker images
oscinfra_web latest 4ea4c8b5cb7f 2 minutes ago 348.9 MB
docker.io/orchardup/php5 latest 7113324d9d9e 12 months ago 330.1 MB
[root@docker188 wordpress]# docker tag oscinfra_web localhost:5000/oscweb/oscinfra_web
[root@docker188 wordpress]# docker push localhost:5000/oscweb/oscinfra_web
The push refers to a repository [localhost:5000/oscweb/oscinfra_web] (len: 1)
Sending image list
Pushing repository localhost:5000/oscweb/oscinfra_web (1 tags)
511136ea3c5a: Image successfully pushed
e2aa6665d371: Image successfully pushed
f0ee64c4df74: Image successfully pushed
2209cbf9dcd3: Image successfully pushed
5e019ab7bf6d: Image successfully pushed
7113324d9d9e: Image successfully pushed
4ea4c8b5cb7f: Image successfully pushed
Pushing tag for rev [4ea4c8b5cb7f] on {http://localhost:5000/v1/repositories/oscweb/oscinfra_web/tags/latest}

15
Docker compose
실행
[root@docker188 wordpress]# docker-compose up
Creating wordpress_db_1...
Pulling image orchardup/mysql:latest...
ab3b99429ab1: Download complete
ab3b99429ab1: Pulling image (latest) from docker.io/orchardup/mysql
Status: Downloaded newer image for docker.io/orchardup/mysql:latest
Creating wordpress_web_1...
Building web...
---> 7113324d9d9e
Step 1 : ADD . /code
---> 64a9cfc3a30a
Removing intermediate container 4c5bf7fbd928
Successfully built 64a9cfc3a30a
Attaching to wordpress_db_1, wordpress_web_1
……
db_1 | 150529 6:06:55 InnoDB: Waiting for the background threads to start
db_1 | 150529 6:06:56 InnoDB: 5.5.38 started; log sequence number 1595675
db_1 | 150529 6:06:56 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
db_1 | 150529 6:06:56 [Note] - '0.0.0.0' resolves to '0.0.0.0';
db_1 | 150529 6:06:56 [Note] Server socket created on IP: '0.0.0.0'.
db_1 | 150529 6:06:56 [Note] Event Scheduler: Loaded 0 events
db_1 | 150529 6:06:56 [Note] /usr/sbin/mysqld: ready for connections.
db_1 | Version: '5.5.38-0ubuntu0.12.04.1-log' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu)

16
Docker compose
실행
[root@docker188 ~]# docker commit -m "0528_status" -a "support@osci.kr" 0358aa2a848f wordpress_web_1_0528
Cd34d5a8b091dcf5b95f3eba1d702f55f591698d15d67b26762c0314b198db31
[root@docker188 ~]# docker commit -m "0528_status" -a "support@osci.kr" 2d20222e6afb mysql_1_0528
5c3f4110a1864995bd5c90287f0e8ccc5453b3cd5600ae532ab5ca322cf217d1
mysql_1_0528 latest 5c3f4110a186 20 seconds ago 292.3 MB
wordpress_web_1_0528 latest cd34d5a8b091 2 minutes ago 348.9 MB
wordpress_web latest 64a9cfc3a30a 18 minutes ago 348.9 MB
oscinfra_web latest 4ea4c8b5cb7f 25 minutes ago 348.9 MB
localhost:5000/oscweb/oscinfra_web latest 4ea4c8b5cb7f 25 minutes ago 348.9 MB
docker.io/orchardup/mysql latest ab3b99429ab1 9 months ago 292.3 MB
docker.io/orchardup/php5 latest 7113324d9d9e 12 months ago 330.1 MB

17
Docker Swarm
소개
Docker Native Clustering System
클러스터 / 컨테이너 / 이미지를 컨트롤
클러스터 그룹에서 비교적 쉬운 WorkLoad 제어
Docker API 지원
Swarm은 매니저 Docker Node는 클러스터의 노드
특별히 필요로 하는 인프라 조건은 없음

18
Docker Swarm
Swarm Host Install (Swarm Host에서 실행)
# yum install mercurial golang git
# mkdir ~/gocode; export GOPATH=~/gocode
# cd ~/gocode
# go get -u github.com/docker/swarm
Swarm Install Test
# ~/gocode/bin/swarm –help

19
Docker Swarm
Docker Node Install (Docker Node에서 실행)
# yum install docker
# vi /etc/sysconfig/docker 파일의 OPTIONS 항목에 -H 0.0.0.0:<포트>를 추가
# systemctl restart docker
/etc/sysconfig/docker 의 옵션

20
Docker Swarm
Setup Swarm Host (Swarm Host에서 실행)
# ~/gocode/bin/swarm create
(Swarm Cluster 를 생성합니다. 생성되는 ID는 따로 잘 보관하여야 합니다)
# ~/gocode/bin/swarm join --addr=<ip-of-node>:2375 token://<swarm_id>
(IP가 한번만 나타나면 바로 Ctrl + C 를 입력하여 취소하여도 상관없습니다)
# ~/gocode/bin/swarm list token://<swarm_id>
(Swarm에 등록된 노드들의 리스트를 확인합니다.)
# ~/gocode/bin/swarm --debug manage --host=0.0.0.0:2375 token://<swarm_id>
(Swarm Manager 시작)
Swarm Manager를 실행하는 도중 Duplicate Error 발생시는 /etc/docker/key.json 파일 or ~/.docker/key.json
파일을 삭제한 후 데몬을 재시작합니다.
클러스터 ID
클러스터에 참가되어 있는 Node

21
Docker Swarm
Docker 컨테이너 실행 (아무 노드에서나 수행)
1번Host에서 ubuntu bash 쉘 수행
2번Host에 컨테이너 기동
1번Host에 컨테이너 파일 없음
2번Host에 컨테이너 파일 확인

22
Docker Swarm
[root@Docker-Host2 ~]# docker -H 192.168.0.154:6644 run -d -t -i centos /bin/bash
9fc314043a7f6960a98e1fd594c047b36aa8240da5a3bd341417aff5dcf2f648
[root@Docker-Host2 ~]#
6249d9581761bcd7b33fac05eee3ba62fea93e779558a690c23ebe73a73f0532
fdeea5649fccc1ef2786d12d08f38b58f0dc6ad0c45fe11b97385bb8eb4e93d1
080a90c0ca8f647455a69e2d0951d802008c5078c091a9940c2dd5267c574358
06cf2a484ea6ed893b5af7e1ac1163314bbe6ed8a55f439fe694e9353ba1054b
fb0e410202fd552529396418ac13279c68fc08a8e2e701898dcd07e221b4a92c
3817a06c550f9350db2bcf349342be8d0fa65010642844c455b725515cc2f694
a2d5a13ce9f7e240f96ab06d838fb72b22f5e59664756de215ff9090e3199d25
Every 2.0s: docker -H 192.168.0.154:6644 ps Fri May 29 00:23:49 2015
a2d5a13ce9f7 centos:latest "/bin/bash" About a minute ago Up About a minute Docker-Host2/boring_pike
3817a06c550f centos:latest "/bin/bash" About a minute ago Up About a minute Docker-Host1/admiring_bell
fb0e410202fd centos:latest "/bin/bash" About a minute ago Up About a minute Docker-Host2/goofy_yalow
06cf2a484ea6 centos:latest "/bin/bash" 2 minutes ago Up About a minute Docker-Host1/stoic_colden
080a90c0ca8f centos:latest "/bin/bash" 2 minutes ago Up 2 minutes Docker-Host2/determined_hodgkin
fdeea5649fcc centos:latest "/bin/bash" 4 minutes ago Up 4 minutes Docker-Host2/thirsty_davinci
6249d9581761 centos:latest "/bin/bash" 4 minutes ago Up 4 minutes Docker-Host1/grave_mcclintock
9fc314043a7f centos:latest "/bin/bash" 5 minutes ago Up 4 minutes Docker-Host1/happy_shockley
2번Host에서 bash 쉘 수행
1번Host에서 모니터링 결과

23
Docker Swarm
Docker Swarm Architecture
Swarm Docker-Host1
Docker-Host2
Swarm-Cluster
Swarm 중앙 집중식 관리
각 노드의 커맨드는 클러스터를 커져 Swarm을 거쳐 최종 노드에서 수행
클러스터의 전략과 필터를 통하여 컨테이너 수행 제어
Listening / Sending
Port 6644
Sending
Port 6644
Sending
Port 6644

24
Docker Kubernetes
소개
Kubernetes는 여러 호스트에서 컨테이너 응용 프로그램을 관리하는 응용 프로그램의 배포, 유지 보수 및
확장을위한 기본 메커니즘을 제공하는 시스템이다.
Kubernetes 는 single master가 여러 node(minions)를 관리한다.
출처: http://www.cyworld.com/ruo91/8923965
- Etcd
kubernetes의 관련 된 정보를 담고
있는 Key/Value 저장소
Master
- Service proxy
설정한 Pod의 RR(Round Robin)을
담당하는 역할
Minion
- Kubelet
Minion을 제어하는 agent
- pod
Control하는 단위

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