目标
部署一个 GuestBook 示例，是 php+redis 环境，我们需要部署3个东西：
- frontend 前端php应用
- redis master
- redis slave
其中每一个都包括 ReplicationController 和 Service，先写配置文件，然后运行起来。
redis master
（1）ReplicationController
redis-master-controller.yml
apiVersion: v1
kind: ReplicationController
metadata:
name: redis-master
labels:
name: redis-master
spec:
replicas: 1
selector:
name: redis-master
template:
metadata:
labels:
name: redis-master
spec:
containers:
- name: master
image: redis:3.0.7-alpine
ports:
- containerPort: 6379
启动：
$ kubectl create -f redis-master-controller.yaml
replicationcontroller/redis-master created
查看当前controller和pod状况：
$ kubectl get rc
NAME DESIRED CURRENT READY AGE
redis-master 1 1 1 54s
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
redis-master-hr8wf 1/1 Running 0 89s
Service
redis-master-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-master
labels:
name: redis-master
spec:
ports:
# the port that this service should serve on
- port: 6379
targetPort: 6379
selector:
name: redis-master
启动：
$ kubectl create -f redis-master-service.yaml
service/redis-master created
查看当前service状况：
$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.152.183.1 <none> 443/TCP 45h
redis-master ClusterIP 10.152.183.209 <none> 6379/TCP 37s
$ kubectl describe services redis-master
Name: redis-master
Namespace: default
Labels: name=redis-master
Annotations: <none>
Selector: name=redis-master
Type: ClusterIP
IP: 10.152.183.209
Port: <unset> 6379/TCP
TargetPort: 6379/TCP
Endpoints: 10.1.1.2:6379
Session Affinity: None
Events: <none>
redis slave
（1）ReplicationController
redis-slave-controller.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: redis-slave
labels:
name: redis-slave
spec:
replicas: 2
selector:
name: redis-slave
template:
metadata:
labels:
name: redis-slave
spec:
containers:
- name: worker
image: gcr.io/google_samples/gb-redisslave:v1
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
启动：
$ kubectl create -f redis-slave-controller.yaml
replicationcontroller/redis-slave created
查看rc：
$ kubectl get rc
NAME DESIRED CURRENT READY AGE
redis-master 1 1 1 6m34s
redis-slave 2 2 2 20s
Service
redis-slave-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-slave
labels:
name: redis-slave
spec:
ports:
# the port that this service should serve on
- port: 6379
selector:
name: redis-slave
启动：
$ kubectl create -f redis-slave-service.yaml
查看 service:
$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.152.183.1 <none> 443/TCP 2d
redis-master ClusterIP 10.152.183.209 <none> 6379/TCP 139m
redis-slave ClusterIP 10.152.183.168 <none> 6379/TCP 35s
frontend
（1）ReplicationController
frontend-controller.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: frontend
labels:
name: frontend
spec:
replicas: 3
selector:
name: frontend
template:
metadata:
labels:
name: frontend
spec:
containers:
- name: php-redis
image: gcr.io/google_samples/gb-frontend:v3
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
启动：
kubectl create -f frontend-controller.yaml
查看rc和pod：
$ kubectl get rc
NAME DESIRED CURRENT READY AGE
frontend 3 3 0 34s
redis-master 1 1 1 144m
redis-slave 2 2 2 137m
$ microk8s.kubectl get pods
NAME READY STATUS RESTARTS AGE
frontend-fb8bs 1/1 Running 0 55s
frontend-pc88k 1/1 Running 0 55s
frontend-sgk4m 1/1 Running 0 55s
redis-master-hr8wf 1/1 Running 0 144m
redis-slave-62w7b 1/1 Running 0 138m
redis-slave-shhsv 1/1 Running 0 138m
Service
frontend-service.yaml
apiVersion: v1
kind: Service
metadata:
name: frontend
labels:
name: frontend
spec:
# if your cluster supports it, uncomment the following to automatically create
# an external load-balanced IP for the frontend service.
# type: LoadBalancer
type: NodePort
ports:
# the port that this service should serve on
- port: 80
nodePort: 30080
selector:
name: frontend
启动：
kubectl create -f frontend-service.yaml
查看 service：
$ kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
frontend NodePort 10.152.183.73 <none> 80:30080/TCP 6s
kubernetes ClusterIP 10.152.183.1 <none> 443/TCP 2d
redis-master ClusterIP 10.152.183.209 <none> 6379/TCP 144m
redis-slave ClusterIP 10.152.183.168 <none> 6379/TCP 5m30s
访问
获取 frontend 的 NodePort：
kubectl describe service frontend | grep NodePort
Type: NodePort
NodePort: <unset> 30080/TCP
访问 <ip>: 30080
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