[原创]Dapr入门教程之四：Dapr程序的部署(Kubernetes模式)
上一篇我们在Standalone模式部署了第一个Dapr程序。这一次我们换成在Kubernetes模式下部署同样的程序。
程序来自Dapr官方的quickstarts教程里的Hello Kubernetes，我们用目前的最新版本v1.0.0-rc.2。
$ git clone -b v1.0.0-rc.2 https://github.com/dapr/quickstarts.git
$ cd quickstarts/hello-kubernetes
里面包括一个Python的程序，每秒发1个HTTP Request给Node程序。一个Node程序，用来在StateStore里保存发过来的OrderId。
下面开始部署。Kubernetes模式的Dapr Runtime的安装，请参看本系列的第二章Dapr的安装。
首先要先部署Redis。跟Standalone模式不同，Kubernetes模式的Dapr Runtime安装的时候不会自动安装Redis,需要手动安装。
$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm repo update
$ helm install redis bitnami/redis
NAME: redis
LAST DEPLOYED: Sun Jan 3 12:42:17 2021
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
** Please be patient while the chart is being deployed **
Redis can be accessed via port 6379 on the following DNS names from within your cluster:
redis-master.default.svc.cluster.local for read/write operations
redis-slave.default.svc.cluster.local for read-only operations
To get your password run:
export REDIS_PASSWORD=$(kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode)
To connect to your Redis server:
1. Run a Redis pod that you can use as a client:
kubectl run --namespace default redis-client --rm --tty -i --restart='Never' --env REDIS_PASSWORD=$REDIS_PASSWORD --image docker.io/bitnami/redis:6.0.9-debian-10-r38 -- bash
2. Connect using the Redis CLI:
redis-cli -h redis-master -a $REDIS_PASSWORD
redis-cli -h redis-slave -a $REDIS_PASSWORD
To connect to your database from outside the cluster execute the following commands:
kubectl port-forward --namespace default svc/redis-master 6379:6379 &
redis-cli -h 127.0.0.1 -p 6379 -a $REDIS_PASSWORD
安装完成。看一下Pod里多了什么:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
redis-master-0 1/1 Running 0 2m5s
redis-slave-0 1/1 Running 0 2m5s
redis-slave-1 1/1 Running 0 1m7s
接下来部署Statestore。
$ cd quickstarts/hello-kubernetes/deploy
$ kubectl apply -f redis.yaml
component.dapr.io/statestore created
redis.yaml的内容如下:
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: statestore
spec:
type: state.redis
metadata:
# These settings will work out of the box if you use `helm install
# bitnami/redis`. If you have your own setup, replace
# `redis-master:6379` with your own Redis master address, and the
# Redis password with your own Secret's name. For more information,
# see https://docs.dapr.io/operations/components/component-secrets .
- name: redisHost
value: redis-master:6379
- name: redisPassword
secretKeyRef:
name: redis
key: redis-password
auth:
secretStore: kubernetes
意思是部署一个名字叫statestore的Component，类型为state.redis。
用dapr cli看一下components:
$ dapr components -k
NAME TYPE VERSION SCOPES CREATED AGE
statestore state.redis 2021-01-03 12:50.41 58s
接下来部署Node的APP。
$ kubectl apply -f node.yaml
service/nodeapp created
deployment.apps/nodeapp created
其中node.yaml的内容如下:
kind: Service
apiVersion: v1
metadata:
name: nodeapp
labels:
app: node
spec:
selector:
app: node
ports:
- protocol: TCP
port: 80
targetPort: 3000
type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nodeapp
labels:
app: node
spec:
replicas: 1
selector:
matchLabels:
app: node
template:
metadata:
labels:
app: node
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "nodeapp"
dapr.io/app-port: "3000"
spec:
containers:
- name: node
image: dapriosamples/hello-k8s-node:latest
ports:
- containerPort: 3000
imagePullPolicy: Always
看一下service:
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 83m
nodeapp LoadBalancer 10.96.83.185 <pending> 80:31324/TCP 49m
nodeapp-dapr ClusterIP None <none> 80/TCP,50001/TCP,50002/TCP,9090/TCP 49m
redis-headless ClusterIP None <none> 6379/TCP 60m
redis-master ClusterIP 10.109.27.202 <none> 6379/TCP 60m
redis-slave ClusterIP 10.103.201.158 <none> 6379/TCP 60m
启动了一个nodeap的service和一个nodeapp-dapr(就是sidecar)的service。
因为是运行在minikube上，所以nodeapp的service没有EXTERNAL IP(显示为pending)。
看一下pod:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nodeapp-5d5dc88584-kqr2v 2/2 Running 0 13m
redis-master-0 1/1 Running 0 142m
redis-slave-0 1/1 Running 0 142m
redis-slave-1 1/1 Running 0 141m
看一下nodeapp的log:
$ kubectl logs nodeapp-5d5dc88584-kqr2v -c node
Node App listening on port 3000!
DAPR_HTTP_PORT: 3500
DAPR_GRPC_PORT: 50001
下面部署python的APP:
$ kubectl apply -f python.yaml
deployment.apps/pythonapp created
python.yaml的内容如下:
apiVersion: apps/v1
kind: Deployment
metadata:
name: pythonapp
labels:
app: python
spec:
replicas: 1
selector:
matchLabels:
app: python
template:
metadata:
labels:
app: python
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "pythonapp"
spec:
containers:
- name: python
image: dapriosamples/hello-k8s-python:latest
看一下pod里多了什么:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nodeapp-5d5dc88584-kqr2v 2/2 Running 0 16m
pythonapp-fcb4f49b-n6ltf 2/2 Running 0 49s
redis-master-0 1/1 Running 0 145m
redis-slave-0 1/1 Running 0 145m
redis-slave-1 1/1 Running 0 144m
看一下nodeapp的log:
$ kubectl logs nodeapp-5d5dc88584-kqr2v -c node
Node App listening on port 3000!
DAPR_HTTP_PORT: 3500
DAPR_GRPC_PORT: 50001
Got a new order! Order ID: 5
Successfully persisted state.
Got a new order! Order ID: 6
Successfully persisted state.
Got a new order! Order ID: 7
Successfully persisted state.
Got a new order! Order ID: 8
Successfully persisted state.
用kubernetes的端口映射查看最新的orderid:
$ kubectl port-forward nodeapp-5d5dc88584-kqr2v 8080:3000
把pod里的nodeapp的http端口3000映射到localhost的8080。另开一个窗口，执行:
$ curl http://localhost:8080/order
或者
$ kubectl port-forward nodeapp-5d5dc88584-kqr2v 8080:3500
把pod里的dapr sidecar的http端口3500映射到localhost的8080。另开一个窗口，执行:
$ curl http://127.0.0.1:8080/v1.0/invoke/nodeapp/method/order/
如果想在redis里查看最新的orderid，执行下面的命令:
$ export REDIS_PASSWORD=$(kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode)
$ kubectl run --namespace default redis-client --rm --tty -i --restart='Never' --env REDIS_PASSWORD=$REDIS_PASSWORD --image docker.io/bitnami/redis:6.0.9-debian-10-r38 -- bash
If you don't see a command prompt, try pressing enter.
I have no name!@redis-client:/$ redis-cli -h redis-master -a $REDIS_PASSWORD
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-master:6379> hgetall nodeapp||order
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