我有一个带有gRPC接口的服务,我希望客户端可以选择使用JSON over HTTP进行调用。我决定使用Google Cloud Platform及其transcode the HTTP request into a gRPC request功能。我决定从Hello GRPC Java Example开始。当使用以下Docker运行命令在Google Compute Engine实例上通过Docker运行后端时,我能够成功获得响应:
docker run --detach --name=esp \
--publish=8000:8000 \
--publish=9000:9000 \
--link=grpc-hello:grpc-hello \
--service hellogrpc.endpoints.skypo-llc.cloud.goog \
--version 2017-11-30r1 \
--http_port=8000 \
--http2_port=9000 \
--backend=grpc://grpc-hello:50051
gcr.io/endpoints-release/endpoints-runtime:1
但是,当我尝试卷曲部署到Kubernetes的相同ESP和后端服务时,我在端口8000上获得二进制输出或在端口9000上获得超时:
$ curl -v -d '{"name":"message"}'
http://helloservice.com:8000/helloworld.Greeter/SayHello?key=REDACTED
.....
Warning: Binary output can mess up your terminal. Use "--output -" to tell
Warning: curl to output it to your terminal anyway, or consider "--output
Warning: <FILE>" to save to a file.
* Failed writing body (0 != 57)
* stopped the pause stream!
* Closing connection 0
这是我的Kubernetes配置:
apiVersion: v1
kind: Service
metadata:
name: grpc-hello
spec:
ports:
- port: 80
targetPort: 9000
protocol: TCP
name: http
selector:
app: grpc-hello
type: LoadBalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: grpc-hello
spec:
replicas: 1
template:
metadata:
labels:
app: grpc-hello
spec:
containers:
- name: esp
image: gcr.io/endpoints-release/endpoints-runtime:1
args: [
"--http_port", "8000",
"--http2_port", "9000",
"--backend", "grpc://127.0.0.1:50051",
"--service", "hellogrpc.endpoints.skypo-llc.cloud.goog",
"--version", "2017-12-22r0",
]
ports:
- containerPort: 9000
containerPort: 8000
- name: java-grpc-hello
image: gcr.io/skypo-llc/java-grpc-hello:1.0
ports:
- containerPort: 50051
和我的Dockerfile:
FROM gcr.io/google_appengine/openjdk8
RUN apt-get update \
&& apt-get -y -q upgrade \
&& rm -rf /var/lib/apt/lists/*
ADD ./server/build/libs/server.jar /hello/server.jar
EXPOSE 8000
EXPOSE 9000
ENTRYPOINT ["java", "-jar", "/hello/server.jar"]
解决方案是将端口8000添加到Kubernetes服务部分:
- port: 8000
targetPort: 8000
protocol: TCP
name: http2
所以,整个服务部分现在是:
apiVersion: v1
kind: Service
metadata:
name: grpc-hello
spec:
ports:
- port: 80
targetPort: 9000
protocol: TCP
name: http
- port: 8000
targetPort: 8000
protocol: TCP
name: http2
selector:
app: grpc-hello
type: LoadBalancer