始終藉口 K8S 難學，今天看到 tutorial 真心覺得技術門檻不高
所以就順手記錄起來了
This tutorial is provided by Google Cloud Platform.
You can reach more detailed information from the Google Cloud Platform.
1. Create Kubernetes Cluster
紅圈處資訊請更新 cluster name, zone.
2. Prepare example application source by Github
從 Github 取得 Source file
heavenruler@cloudshell:~ (project-name)$ git clone https://github.com/kubernetes/examples Cloning into 'examples'... remote: Enumerating objects: 33, done. remote: Counting objects: 100% (33/33), done. remote: Compressing objects: 100% (17/17), done. remote: Total 11289 (delta 16), reused 30 (delta 16), pack-reused 11256 Receiving objects: 100% (11289/11289), 16.91 MiB | 7.28 MiB/s, done. Resolving deltas: 100% (5981/5981), done.
檢查一下內容物
heavenruler@cloudshell:~/examples/guestbook (project-name)$ ls -al total 56 drwxr-xr-x 6 heavenruler heavenruler 4096 Sep 29 10:40 . drwxr-xr-x 8 heavenruler heavenruler 4096 Sep 29 10:40 .. drwxr-xr-x 2 heavenruler heavenruler 4096 Sep 29 10:40 all-in-one -rw-r--r-- 1 heavenruler heavenruler 900 Sep 29 10:40 frontend-deployment.yaml -rw-r--r-- 1 heavenruler heavenruler 438 Sep 29 10:40 frontend-service.yaml drwxr-xr-x 2 heavenruler heavenruler 4096 Sep 29 10:40 legacy -rw-r--r-- 1 heavenruler heavenruler 367 Sep 29 10:40 MAINTENANCE.md drwxr-xr-x 2 heavenruler heavenruler 4096 Sep 29 10:40 php-redis -rw-r--r-- 1 heavenruler heavenruler 239 Sep 29 10:40 README.md -rw-r--r-- 1 heavenruler heavenruler 607 Sep 29 10:40 redis-master-deployment.yaml -rw-r--r-- 1 heavenruler heavenruler 233 Sep 29 10:40 redis-master-service.yaml drwxr-xr-x 2 heavenruler heavenruler 4096 Sep 29 10:40 redis-slave -rw-r--r-- 1 heavenruler heavenruler 941 Sep 29 10:40 redis-slave-deployment.yaml -rw-r--r-- 1 heavenruler heavenruler 209 Sep 29 10:40 redis-slave-service.yaml
3. Setup Redis master docker instance
3-1. Setup gcloud & kubectl credential
heavenruler@cloudshell:~ (project-name)$ gcloud container clusters get-credentials test-cluster --zone asia-east1 Fetching cluster endpoint and auth data. kubeconfig entry generated for test-cluster.
3-2. review redis master yaml config
heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat redis redis-master-deployment.yaml
apiVersion: apps/v1 # for k8s versions before 1.9.0 use apps/v1beta2 and before 1.8.0 use extensions/v1beta1
kind: Deployment
metadata:
name: redis-master
spec:
selector:
matchLabels:
app: redis
role: master
tier: backend
replicas: 1
template:
metadata:
labels:
app: redis
role: master
tier: backend
spec:
containers:
- name: master
image: k8s.gcr.io/redis:e2e # or just image: redis
resources:
requests:
cpu: 100m
memory: 100Mi
ports:
- containerPort: 6379
3-3 deploy redis master docker instance
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f redis-master-deployment.yaml deployment.apps "redis-master" created heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get podsNAME READY STATUS RESTARTS AGEredis-master-585798d8ff-5bd4r 1/1 Running 0 37s
4. Create redis-master service
heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat redis-master-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-master
labels:
app: redis
role: master
tier: backend
spec:
ports:
- port: 6379
targetPort: 6379
selector:
app: redis
role: master
tier: backend
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f redis-master-service.yaml
service "redis-master" created
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.31.240.1 <none> 443/TCP 32m
redis-master ClusterIP 10.31.245.206 <none> 6379/TCP 15s
5. Setup Redis slave docker instance
heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat redis-slave-deployment.yaml
apiVersion: apps/v1 # for k8s versions before 1.9.0 use apps/v1beta2 and before 1.8.0 use extensions/v1beta1
kind: Deployment
metadata:
name: redis-slave
spec:
selector:
matchLabels:
app: redis
role: slave
tier: backend
replicas: 2
template:
metadata:
labels:
app: redis
role: slave
tier: backend
spec:
containers:
- name: slave
image: gcr.io/google_samples/gb-redisslave:v1
resources:
requests:
cpu: 100m
memory: 100Mi
env:
- name: GET_HOSTS_FROM
value: dns
# If your cluster config does not include a dns service, then to
# instead access an environment variable to find the master
# service's host, comment out the 'value: dns' line above, and
# uncomment the line below:
# value: env
ports:
- containerPort: 6379
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f redis-slave-deployment.yaml
deployment.apps "redis-slave" created
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get pods
NAME READY STATUS RESTARTS AGE
redis-master-585798d8ff-5bd4r 1/1 Running 0 5m
redis-slave-865486c9df-4hszl 0/1 ContainerCreating 0 7s
redis-slave-865486c9df-n8zcp 0/1 ContainerCreating 0 7s
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get pods
NAME READY STATUS RESTARTS AGE
redis-master-585798d8ff-5bd4r 1/1 Running 0 6m
redis-slave-865486c9df-4hszl 1/1 Running 0 33s
redis-slave-865486c9df-n8zcp 1/1 Running 0 33s
6. Create redis-slave service
heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat redis-slave-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-slave
labels:
app: redis
role: slave
tier: backend
spec:
ports:
- port: 6379
selector:
app: redis
role: slave
tier: backend
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f redis-slave-service.yaml
service "redis-slave" created
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.31.240.1 <none> 443/TCP 37m
redis-master ClusterIP 10.31.245.206 <none> 6379/TCP 5m
redis-slave ClusterIP 10.31.242.68 <none> 6379/TCP 12s
7. Setup Guestbook Front Docker Instance
heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat frontend-deployment.yaml
apiVersion: apps/v1 # for k8s versions before 1.9.0 use apps/v1beta2 and before 1.8.0 use extensions/v1beta1
kind: Deployment
metadata:
name: frontend
spec:
selector:
matchLabels:
app: guestbook
tier: frontend
replicas: 3
template:
metadata:
labels:
app: guestbook
tier: frontend
spec:
containers:
- name: php-redis
image: gcr.io/google-samples/gb-frontend:v4
resources:
requests:
cpu: 100m
memory: 100Mi
env:
- name: GET_HOSTS_FROM
value: dns
# If your cluster config does not include a dns service, then to
# instead access environment variables to find service host
# info, comment out the 'value: dns' line above, and uncomment the
# line below:
# value: env
ports:
- containerPort: 80
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f frontend-deployment.yaml
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get pods
NAME READY STATUS RESTARTS AGE
frontend-67f65745c-pjsbg 1/1 Running 0 36s
frontend-67f65745c-qqrs9 1/1 Running 0 36s
frontend-67f65745c-w5dp8 1/1 Running 0 36s
redis-master-585798d8ff-5bd4r 1/1 Running 0 9m
redis-slave-865486c9df-4hszl 1/1 Running 0 4m
redis-slave-865486c9df-n8zcp 1/1 Running 0 4m
因為要將服務公開在 Public Internet 上，所以要透過 LoadBalancer 取得 Public IP，所以要調整一些設定
heavenruler@cloudshell:~/examples/guestbook (project-name)$ sed -i -e 's/NodePort/LoadBalancer/g' frontend-service.yaml heavenruler@cloudshell:~/examples/guestbook (project-name)$ cat frontend-service.yaml | grep LoadBalancer # comment or delete the following line if you want to use a LoadBalancer type: LoadBalancer # type: LoadBalancer
接著 deploy service
heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl create -f frontend-service.yaml service "frontend" created heavenruler@cloudshell:~/examples/guestbook (project-name)$ kubectl get services --watch NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE frontend LoadBalancer 10.31.250.251 <pending> 80:32488/TCP 19s kubernetes ClusterIP 10.31.240.1 <none> 443/TCP 43m redis-master ClusterIP 10.31.245.206 <none> 6379/TCP 11m redis-slave ClusterIP 10.31.242.68 <none> 6379/TCP 6m frontend LoadBalancer 10.31.250.251 35.229.221.253 80:32488/TCP 50s
等 LoadBalancer 拿到 Public IP 後即算完成
先試試看 front 服務是否正常
heavenruler@cloudshell:~/examples/guestbook (project-name)$ curl -I http://35.229.221.253 HTTP/1.1 200 OK Date: Sat, 29 Sep 2018 03:26:39 GMT Server: Apache/2.4.10 (Debian) PHP/5.6.20 Last-Modified: Wed, 09 Sep 2015 18:35:04 GMT ETag: "399-51f54bdb4a600" Accept-Ranges: bytes Content-Length: 921 Vary: Accept-Encoding Content-Type: text/html
8. Browser Guestbook by Web Browser
Done.