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## kube-dns (skydns) 설치, dashboard 설치
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## 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
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## 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
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## 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"
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