###################################
## kube-dns (skydns) 설치, dashboard 설치
###################################
## 검색창에 [kubernetes] 을 넣고 검색을 하면 됨


$ cd ~/kube
$ export KUBE_ROOT=/home/ubuntu/go_workspace/src/k8s.io/kubernetes
$ export DNS_REPLICAS=1
$ export DNS_DOMAIN=cluster.local
$ export DNS_SERVER_IP=192.168.30.200

$ sed -e "s/\\\$DNS_REPLICAS/${DNS_REPLICAS}/g;\
s/\\\$DNS_DOMAIN/${DNS_DOMAIN}/g;" \
"${KUBE_ROOT}/cluster/addons/dns/skydns-rc.yaml.sed" > skydns-rc.yaml

## skydns-rc.yaml 에 kube-master-url 추가
$ vi skydns-rc.yaml
81         - --kube-master-url=http://192.168.30.13:8080


$ sed -e "s/\\\$DNS_SERVER_IP/${DNS_SERVER_IP}/g" \
"${KUBE_ROOT}/cluster/addons/dns/skydns-svc.yaml.sed" > skydns-svc.yaml

$ cat <<EOF >namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: kube-system
EOF


$ cp ~/go_workspace/src/k8s.io/kubernetes/cluster/addons/dashboard/dashboard-controller.yaml ~/kube/.
$ cp ~/go_workspace/src/k8s.io/kubernetes/cluster/addons/dashboard/dashboard-service.yaml ~/kube/.


## kube-master01 에 복사
$ ssh kube-master01 "mkdir -p kube"
$ scp ~/kube/skydns-rc.yaml kube-master01:~/kube/.
$ scp ~/kube/skydns-svc.yaml kube-master01:~/kube/.
$ scp ~/kube/namespace.yaml kube-master01:~/kube/.

$ scp ~/kube/dashboard-controller.yaml kube-master01:~/kube/.
$ scp ~/kube/dashboard-service.yaml kube-master01:~/kube/.

$ ssh kube-master01 "kubectl create -f ~/kube/namespace.yaml"
$ ssh kube-master01 "kubectl --namespace=kube-system create -f ~/kube/skydns-rc.yaml"
$ ssh kube-master01 "kubectl --namespace=kube-system create -f ~/kube/skydns-svc.yaml"



## dashboard 설치
$ cd ~/kube

## master api 에 접속할 수 있게 정보를 추가
$ vi kubernetes-dashboard.yaml
47         - --apiserver-host=http://192.168.30.13:8080

$ scp ~/kube/kubernetes-dashboard.yaml kube-master01:~/kube/.
$ ssh kube-master01 "kubectl create -f ~/kube/kubernetes-dashboard.yaml" 



## skydns 설치 확인
$ vi ~/kube/busybox.yaml
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - image: gcr.io/google_containers/busybox
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
    name: busybox
  restartPolicy: Always


$ scp ~/kube/busybox.yaml kube-master01:~/kube/.
$ ssh kube-master01 "kubectl create -f ~/kube/busybox.yaml"


## -s 옵션으로 api 서버 지정 가능
$ kubectl -s http://kube-master01:8080 get pods --all-namespaces -o wide
$ kubectl -s http://kube-master01:8080 describe pod kube-dns-v19-d1tse --namespace=kube-system

$ kubectl -s http://kube-master01:8080 get pods busybox -o wide
$ kubectl -s http://kube-master01:8080 exec busybox -- nslookup kubernetes.default




###################################
## kubectl 사용법
###################################

## nginx pod 생성  (replication controller 대신 replica set 이 생겼음)
$ kubectl -s http://kube-master01:8080 run nginx --image=nginx (--replicas=2) --port=80
$ kubectl -s http://kube-master01:8080 get pods
$ kubectl -s http://kube-master01:8080 get pods -o wide
$ kubectl -s http://kube-master01:8080 get pod -l run=nginx


## nginx scaling
$ kubectl -s http://kube-master01:8080 scale deployment/nginx --replicas=1

## nginx auto scaling
$ kubectl -s http://kube-master01:8080 autoscale deployment/nginx --min=1 --max=3


## nginx rc 조회
$ kubectl -s http://kube-master01:8080 get rs



## 서비스 멈춤없이 이미지 버전 올리기 (edit 로 파일 수정하면 됨)
$ kubectl -s http://kube-master01:8080 edit deployment/nginx


## nginx service 생성 (port : host에 노출되는 port,   target-port : docker 내부에서 뜨는 port)
$ kubectl -s http://kube-master01:8080 expose deployment nginx --port=8080 --target-port=80 (--type=LoadBalancer) --name=nginx
$ kubectl -s http://kube-master01:8080 get services


## nginx pod 삭제
$ kubectl -s http://kube-master01:8080 get deployment (nginx)
$ kubectl -s http://kube-master01:8080 delete deployment nginx

## nginx service 삭제
$ kubectl -s http://kube-master01:8080 delete service nginx

## nginx pod, service 동시 삭제
$ kubectl -s http://kube-master01:8080 delete deployment,service nginx
$ kubectl -s http://kube-master01:8080 delete deployments/nginx services/nginx

## nginx pod, service 동시 삭제 (label 활용 : -l or --selector)
$ kubectl -s http://kube-master01:8080 delete deployment,services -l app=nginx


## nginx replication controller 삭제 (디폴트는 pod 도 삭제됨, --cascade=false : rc 만 삭제) 
$ kubectl -s http://kube-master01:8080 delete rc nginx-rc
$ kubectl -s http://kube-master01:8080 delete rc nginx-rc --cascade=false


## nginx 안으로 들어가기
$ kubectl -s http://kube-master01:8080 exec -it nginx-3449338310-sl1ou -- /bin/bash

## pod 내의 컨테이너 로그 보기
$ kubectl -s http://kube-master01:8080 logs -f nginx-3449338310-sl1ou
$ kubectl -s http://kube-master01:8080 logs --tail=20 nginx-3449338310-sl1ou
$ kubectl -s http://kube-master01:8080 logs --since=1m nginx-3449338310-sl1ou




## Guestbook (redis-master, redis-slave, frontend) 샘플
$ ~/go_workspace/src/k8s.io/kubernetes
$ kubectl -s http://kube-master01:8080 create -f examples/guestbook/


## Service  frontend 타입을 ClusterIP 에서 NodePort 로 변경
$ kubectl -s http://kube-master01:8080 edit services/frontend
28   type: NodePort


## json format 으로 output 보기
$ kubectl -s http://kube-master01:8080 get svc frontend -o json
$ kubectl -s http://kube-master01:8080 get svc frontend -o "jsonpath={.spec.ports[0].nodePort}{"\n"}"


## Guestbook 삭제
$ kubectl -s http://kube-master01:8080 delete deployments,services -l "app in (redis, guestbook)"



## 명령어로 pod 생성하는 방법
$ kubectl -s http://kube-master01:8080 run frontend --image=gcr.io/google-samples/gb-frontend:v4 \
--env="GET_HOSTS_FROM=dns" --port=80 --replicas=3 \
--limits="cpu=100m,memory=100Mi" \
--labels="app=guestbook,tier=frontend"

## Service frontend 를 명령어로 NodePort 타입으로 생성
$ kubectl -s http://kube-master01:8080 expose deployment frontend \
--port=80 --target-port=80 --name=frontend --type=NodePort \
--labels=app=guestbook,tier=frontend --selector=app=guestbook,tier=frontend





###################################
## glusterFS 설치 및 Kubernetes 에서 활용
###################################
## glusterFS 설치

## gluster01 과 gluster02 모두 수행
# vi /etc/hosts
192.168.30.15   kube-node01 gluster01
192.168.30.16   kube-node02 gluster02

# mkfs.xfs -f /dev/sdb
# mkdir -p /data/gluster/brick1 && chmod -R 777 /data
# echo '/dev/sdb /data/gluster/brick1 xfs defaults 1 2' >> /etc/fstab
# mount -a && mount

# apt-get install -y glusterfs-server glusterfs-client
# service glusterfs-server start


## gluster01 에서
# gluster peer probe gluster02

## gluster02 에서
# gluster peer probe gluster01


## gluster01 과 gluster02 모두 수행
# mkdir -p /data/gluster/brick1/gv0 && chmod -R 777 /data
# mkdir -p /data/gluster/brick1/gv1 && chmod -R 777 /data/gluster/brick1/gv1


## gluster01 에서 수행 (gv1 은 pod 에서 glusterfs 연결할 때 사용할 디스크)
# gluster volume create gv0 replica 2 gluster01:/data/gluster/brick1/gv0 gluster02:/data/gluster/brick1/gv0
# gluster volume start gv0

# gluster volume create gv1 replica 2 gluster01:/data/gluster/brick1/gv1 gluster02:/data/gluster/brick1/gv1
# gluster volume start gv1


## gluster01 과 gluster02 모두 수행
# mkdir -p /ext && chmod 777 -R /ext
# mount -t glusterfs gluster01:/gv0 /ext



## kubernetes 와 glusterFS 테스트
$ cd ~/go_workspace/src/k8s.io/kubernetes
$ cp examples/volumes/glusterfs/*.json ~/kube && cd ~/kube

$ vi glusterfs-endpoints.json
11           "ip": "192.168.30.15"
23           "ip": "192.168.30.16"

$ vi glusterfs-pod.json
11                 "image": "nginx"
25                     "path": "gv1",
26                     "readOnly": false


$ ssh kube-master01 "mkdir -p kube"
$ scp ~/kube/glusterfs-endpoints.json kube-master01:~/kube/.
$ scp ~/kube/glusterfs-service.json kube-master01:~/kube/.
$ scp ~/kube/glusterfs-pod.json kube-master01:~/kube/.

$ ssh kube-master01 "kubectl create -f ~/kube/glusterfs-endpoints.json"
$ ssh kube-master01 "kubectl create -f ~/kube/glusterfs-service.json"
$ ssh kube-master01 "kubectl create -f ~/kube/glusterfs-pod.json"


$ kubectl -s http://kube-master01:8080 get pods glusterfs -o jsonpath='{.status.hostIP}{"\n"}'

$ ssh kube-node01 "mount | grep gv1"






Posted by Kubernetes Korea co-leader seungkyua@gmail.com