해당 자료는 사내 교육용으로 제작된 자료입니다.
자료 사용시 출처 부탁 드려요.
Container & Orchestration 교육 자료
목차
Docker
Hands-on 환경
OS : CentOS 7.7
DisableSELinux,Firewalld
Install
- Install Package
$ yum -y install docker - start service
docker$ systemctl enable --now docker
RUN
- start container
nginx$ docker run -d -ti --name nginx -p 80:80 nginx - check container
nginx$ docker ps -a - access web
$ crul http://192.168.200.100
- stop container
nginx$ docker stop nginx - delete container
nginx$ docker rm nginx - container images
$ docker images
Build
- create
Dockerfile
FROM php:7.2-apache
MAINTAINER chhan <cheolhee.han@ibm.com>
ADD htdocs/index.php /var/www/html/index.php
EXPOSE 80
<html>
<head><title>chhan sample page</title></head>
<body>
<center>
<b>
<?php
$host=gethostname();
echo "Container Name : ";
echo $host;
?>
<p> Image Version : original </p>
</b>
</center>
</body>
</html>
- build image
$ docker build -t php-web:v1 . Sending build context to Docker daemon 69.63 kB Step 1/4 : FROM php:7.2-apache Trying to pull repository docker.io/library/php ... 7.2-apache: Pulling from docker.io/library/php 68ced04f60ab: Already exists 1d2a5d8fa585: Pull complete 5d59ec4ae241: Pull complete d42331ef4d44: Pull complete 408b7b7ee112: Pull complete 570cd47896d5: Pull complete 2419413b2a16: Pull complete ece88053da01: Pull complete b2131b538da3: Pull complete e26c9457b1ed: Pull complete 6b4ecf095186: Pull complete 6a41f34ff2f0: Pull complete b6669ed2ef9e: Pull complete 0441670f3790: Pull complete Digest: sha256:aa35f1d87dc285959f365c0181967956849734577db72b5b30de7cc73308b44f Status: Downloaded newer image for docker.io/php:7.2-apache ---> ba07a75a195b Step 2/4 : MAINTAINER chhan <cheolhee.han@ibm.com> ---> Running in ae0e738f0c73 ---> 642eae0a1cb5 Removing intermediate container ae0e738f0c73 Step 3/4 : ADD htdocs/index.php /var/www/html/index.php ---> 2a23b4d2dc2d Removing intermediate container f685d41d2501 Step 4/4 : EXPOSE 80 ---> Running in 18a7ba3a06a8 ---> d4c7b832c710 Removing intermediate container 18a7ba3a06a8 Successfully built d4c7b832c710 - change tag
$ docker tag php-web:v1 han0495/php-web:v1 - docker login
$ docker login Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one. Username: han0495 Password: Login Succeeded - push image
$ docker push han0495/php-web:v1 The push refers to a repository [docker.io/han0495/php-web] 89bb5e6b86ac: Pushed 6565bce2d5e5: Mounted from library/php 2159d2f64d7e: Mounted from library/php 7c111aa3fc84: Mounted from library/php 1bc9b7122630: Mounted from library/php bc4aa4d1d971: Mounted from library/php 8b81b9cd95de: Mounted from library/php 85dc2281e45a: Mounted from library/php 0fc284fc9cf5: Mounted from library/php 732057c800a3: Mounted from library/php 4cc11613548d: Mounted from library/php df6c050501b6: Mounted from library/php b4bfb20b5f05: Mounted from library/php 2e8cc9f5313f: Mounted from library/php f2cb0ecef392: Mounted from library/nginx v1: digest: sha256:0b13f585044db431341d5cce3b48df37e78598317fdf60f0135ffffb2c89a80c size: 3449
- run
$ docker run -d -ti --name php-web -p 80:80 han0495/php-web:v1
Podman
Hands-on 환경
OS : CentOS 8.1
DisableSELinux,Firewalld
Install
$ dnf -y install podman
RUN
- start container
httpd$ podman run -d -ti --name web -p 80:80 httpd - check container
nginx$ podman ps -a - access web
$ curl 192.168.200.101
<html><body><h1>It works!</h1></body></html>
Kubernetes
Hands-on 환경
Kubernetes Master 3 Node cluster 구성
Kubernetes Worker 2 Node
Kubernetes v1.16.8
Docker v18.09.7
APP 배포(NodePort)
php-web.yamlYaml 작성
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
run: php-web
name: php-web
spec:
replicas: 5
selector:
matchLabels:
run: php-web
template:
metadata:
labels:
run: php-web
spec:
containers:
- image: han0495/php-web:v1
name: php-web
---
apiVersion: v1
kind: Service
metadata:
labels:
run: php-web
name: php-web
namespace: default
spec:
clusterIP: 10.233.25.48
externalTrafficPolicy: Cluster
ports:
- nodePort: 30518
port: 80
protocol: TCP
targetPort: 80
selector:
run: php-web
sessionAffinity: None
type: NodePort
php-web배포$ kubectl create -f php-web.yamlphp-web배포 확인$ kubectl get allphp-web서비스 확인
$ curl worker1.example.com:30518
$ curl worker2.example.com:30518
Kubernetes-dashboard 둘러보기
$ kubectl get all -l k8s-app=kubernetes-dashboard -A
Kubernetes Node 장애 시나리오
$ kubectl drain worker2.example.com
OpenShift
Hands-on 환경
OpenShift 3 Node cluster 구성
OpenShift Worker 2 Node
OpenShift Infra 2 Node
OpenShift v3.11
Docker v1.13.1
APP 배포(S2I)
GIT Source
$ oc new-app httpd~https://github.com/chhanz/sample-httpd-example.git
$ oc expose service sample-httpd-example
Local Source
$ git clone https://github.com/chhanz/sample-httpd-example.git
$ cd sample-httpd-example
$ vi index.html
## 변경된 Source Build
$ oc start-build sample-httpd-example --from-dir=./ --commit=v2
Auto-scaling
Dockerfilesample sourceFROM php:5-apache ADD index.php /var/www/html/index.php RUN chmod a+rx index.phpindex.phpsource
CPU 부하 유발 source.<?php $x = 0.0001; for ($i = 0; $i <= 1000000; $i++) { $x += sqrt($x); } echo "OK!"; ?>- Build image : https://hub.docker.com/r/han0495/hpa-example
APP 배포
php-apache.yml$ oc create -f php-apache.yml $ oc expose service/php-apache
HPA(Horizontal Pod Autoscaler) 생성
$ oc autoscale deployment php-apache --cpu-percent=25 --min=1 --max=10
부하 발생
$ while true; do wget -q -O- http://php-apache-test-project.apps.chhan.com; done
- HPA 상태 확인
$ oc get hpa - Grafana Dashboard
