Skywalking8.0.1在K8s中的使用

港控/mmm° 2022-11-26 07:47 352阅读 0赞

## Skywalking8.0.1在K8s中的使用 ##

### 1. 准备 ###

ElasticSearch 7.5.1  
SkyWalking APM 8.0.1

### 2. ElasticSearch准备 ###

此处es使用helm3部署，地址 https://github.com/elastic/helm-charts/tree/7.8.1/elasticsearch

#### clone ####

将 helm-charts clone 到本地

git clone https://github.com/elastic/helm-charts.git
    git checkout 7.8.1

#### edit ####

按需修改 helm-charts/elasticsearch/values.yaml 中 imageTag，我需要7.5.1

imageTag: "7.5.1"

#### install ####

install:

cd helm-charts
    helm install es4skywalking .\es4skywalking\ -n fn-rec

#### check ####

查看是否正常启动

kubectl get pods -n <your-namespace> -o wide
    
    kubectl describe pod <pod-name>  -n <your-namespace>

### 3. skywalking部署 ###

同样通过helm3来安装。

#### clone ####

git clone https://github.com/apache/skywalking-kubernetes.git

#### 使用已有的es部署 ####

$ cd chart
    
    $ helm repo add elastic https://helm.elastic.co
    
    $ helm dep up skywalking
    
    $ helm install <release_name> skywalking -n <namespace> \
            --set elasticsearch.enabled=false \
            --set elasticsearch.config.host=<es_host> \
            --set elasticsearch.config.port.http=<es_port> \
            --set elasticsearch.config.user=<es_user> \
            --set elasticsearch.config.password=<es_password>

如：

helm install my-skywalking .\skywalking\ -n fn-rec --set elasticsearch.enabled=false --set elasticsearch.config.host=elasticsearch-skywalking-master-headless --set elasticsearch.config.port.http=9200

#### check ####

同样检查是否正确

kubectl get pods -n <your-namespace> -o wide
    
    kubectl describe pod <pod-name>  -n <your-namespace>

### 4. 项目接入skywalking agent ###

#### 修改目标项目的dockerFile ####

FROM maven:3.6.3-openjdk-14 AS MAVEN_BUILD
    ARG PROFILE
    COPY pom.xml /build/
    COPY src /build/src/
    WORKDIR /build/
    RUN mvn clean package -P${PROFILE} -Dmaven.test.skip=true
    
    FROM adoptopenjdk/openjdk14-openj9
    WORKDIR /app
    COPY --from=MAVEN_BUILD /build/target/demo.jar /app
    
    # 加javaagent参数很重要
    ENTRYPOINT  ["java ", "-javaagent:/sidecar/agent/skywalking-agent.jar", "--enable-preview","-jar", "demo.jar"]

#### k8s.yaml ####

注意 ： 镜像中没有JAVA\_OPTS这个ENV实际上这个地方不会生效，所以在docker中 -javaagent:/sidecar/agent/skywalking-agent.jar 是需要的。

示例

kind: Deployment
    apiVersion: apps/v1
    metadata:
      name: search-zd
      labels:
        app: search-zd
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: search-zd
      template:
        metadata:
          labels:
            app: search-zd
          annotations:
            prometheus.io/scrape: 'true'
            prometheus.io/path: '/actuator/prometheus'
            prometheus.io/port: '8088'
        spec:
          initContainers:
            - name: skywalking-agent
    		  #使用本地打包测试镜像，正式环境可以使用dockerhub或者私服的镜像容器中心的容器
              image: 'search-zd/skywalking-agent:v1.8.0.1'
              command: ['cp','-rf','/skywalking/agent/','/sidecar']
              imagePullPolicy: IfNotPresent
              volumeMounts:
                - name: sidecar
                  mountPath: /sidecar
          containers:
            - name: search-zd
              image: 'search-zd/fn-es-search:1.0.0.5'
              env:
    			# 镜像中没有JAVA_OPTS这个ENV实际上这个地方不会生效，所以在docker中 -javaagent:/sidecar/agent/skywalking-agent.jar 是需要的。
                - name: JAVA_OPTS
                  value: -javaagent:/sidecar/agent/skywalking-agent.jar
                - name: SW_AGENT_NAME
                  value: search-zd
                - name: SW_AGENT_COLLECTOR_BACKEND_SERVICES
                  value: fn-skywalking-oap:11800
              ports:
                - name: server
                  containerPort: 8080
                  protocol: TCP
                - name: management
                  containerPort: 9080
                  protocol: TCP
              livenessProbe:
                tcpSocket:
                  port: 8080
                timeoutSeconds: 5
              readinessProbe:
                tcpSocket:
                  port: 8080
                timeoutSeconds: 5
              resources:
                limits:
                  cpu: 2000m
                  memory: 4Gi
                requests:
                  cpu: 500m
                  memory: 2Gi
              imagePullPolicy: IfNotPresent
              volumeMounts:
                - name: sidecar
                  mountPath: /sidecar
          restartPolicy: Always
          volumes:
            - name: sidecar
              emptyDir: {}
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: search-zd
    spec:
      type: ClusterIP
      ports:
        - name: server
          port: 80
          targetPort: 8080
        - name: management
          port: 9080
          targetPort: 9080
      selector:
        app: search-zd

#### 部署 ####

apply:

kubectl apply -f k8s.yaml -n <namespace>

checkout:

kubectl get pods -n <your-namespace> -o wide
    
    kubectl describe pod <pod-name>  -n <your-namespace>

简单查看ui：使用 port-forward 转发一下

kubectl port-forward <target-pod> 8080:8080 -n <namespace>

### 5. 文档 ###

中文文档：https://github.com/SkyAPM/document-cn-translation-of-skywalking/blob/master/docs/zh/8.0.0/README.md  
官网：https://skywalking.apache.org/zh/downloads/