Istio 快速入门

分手后的思念是犯贱 2023-01-15 13:24 278阅读 0赞

*  下载 istio：

curl -L https://istio.io/downloadIstio | sh -
    
    cd istio-1.9.0
    
    export PATH=$PWD/bin:$PATH              #将 istioctl 加入环境变量

然后需要通过 helm 部署好 istio，此处省略。

*  命名空间添加标签：

方便 Istio 在部署应用的时候，自动的注入 Envoy sidecar 代理：

kubectl label namespace default istio-injection=enabled

*  部署 Bookinfo 示例应用：

cat samples/bookinfo/platform/kube/bookinfo.yaml

apiVersion: v1
    kind: Service
    metadata:
      name: details
      labels:
        app: details
        service: details
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: details
    
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-details
      labels:
        account: details
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: details-v1
      labels:
        app: details
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: details
          version: v1
      template:
        metadata:
          labels:
            app: details
            version: v1
        spec:
          serviceAccountName: bookinfo-details
          containers:
          - name: details
            image: docker.io/istio/examples-bookinfo-details-v1:1.16.2
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
            securityContext:
              runAsUser: 1000
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: ratings
      labels:
        app: ratings
        service: ratings
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: ratings
    
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-ratings
      labels:
        account: ratings
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: ratings-v1
      labels:
        app: ratings
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: ratings
          version: v1
      template:
        metadata:
          labels:
            app: ratings
            version: v1
        spec:
          serviceAccountName: bookinfo-ratings
          containers:
          - name: ratings
            image: docker.io/istio/examples-bookinfo-ratings-v1:1.16.2
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
            securityContext:
              runAsUser: 1000
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: reviews
      labels:
        app: reviews
        service: reviews
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: reviews
    
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-reviews
      labels:
        account: reviews
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v1
      labels:
        app: reviews
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v1
      template:
        metadata:
          labels:
            app: reviews
            version: v1
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: docker.io/istio/examples-bookinfo-reviews-v1:1.16.2
            imagePullPolicy: IfNotPresent
            env:
            - name: LOG_DIR
              value: "/tmp/logs"
            ports:
            - containerPort: 9080
            volumeMounts:
            - name: tmp
              mountPath: /tmp
            - name: wlp-output
              mountPath: /opt/ibm/wlp/output
            securityContext:
              runAsUser: 1000
          volumes:
          - name: wlp-output
            emptyDir: { }
          - name: tmp
            emptyDir: { }
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v2
      labels:
        app: reviews
        version: v2
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v2
      template:
        metadata:
          labels:
            app: reviews
            version: v2
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: docker.io/istio/examples-bookinfo-reviews-v2:1.16.2
            imagePullPolicy: IfNotPresent
            env:
            - name: LOG_DIR
              value: "/tmp/logs"
            ports:
            - containerPort: 9080
            volumeMounts:
            - name: tmp
              mountPath: /tmp
            - name: wlp-output
              mountPath: /opt/ibm/wlp/output
            securityContext:
              runAsUser: 1000
          volumes:
          - name: wlp-output
            emptyDir: { }
          - name: tmp
            emptyDir: { }
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: reviews-v3
      labels:
        app: reviews
        version: v3
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: reviews
          version: v3
      template:
        metadata:
          labels:
            app: reviews
            version: v3
        spec:
          serviceAccountName: bookinfo-reviews
          containers:
          - name: reviews
            image: docker.io/istio/examples-bookinfo-reviews-v3:1.16.2
            imagePullPolicy: IfNotPresent
            env:
            - name: LOG_DIR
              value: "/tmp/logs"
            ports:
            - containerPort: 9080
            volumeMounts:
            - name: tmp
              mountPath: /tmp
            - name: wlp-output
              mountPath: /opt/ibm/wlp/output
            securityContext:
              runAsUser: 1000
          volumes:
          - name: wlp-output
            emptyDir: { }
          - name: tmp
            emptyDir: { }
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: productpage
      labels:
        app: productpage
        service: productpage
    spec:
      ports:
      - port: 9080
        name: http
      selector:
        app: productpage
    
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: bookinfo-productpage
      labels:
        account: productpage
    
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: productpage-v1
      labels:
        app: productpage
        version: v1
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: productpage
          version: v1
      template:
        metadata:
          labels:
            app: productpage
            version: v1
        spec:
          serviceAccountName: bookinfo-productpage
          containers:
          - name: productpage
            image: docker.io/istio/examples-bookinfo-productpage-v1:1.16.2
            imagePullPolicy: IfNotPresent
            ports:
            - containerPort: 9080
            volumeMounts:
            - name: tmp
              mountPath: /tmp
            securityContext:
              runAsUser: 1000
          volumes:
          - name: tmp
            emptyDir: { }

kubectl apply -f samples/bookinfo/platform/kube/bookinfo.yaml
    
    kubectl get pod
    
    NAME                              READY   STATUS    RESTARTS   AGE
    details-v1-66b6955995-wmghv       2/2     Running   0          3m35s
    productpage-v1-5d9b4c9849-d96lb   2/2     Running   0          3m35s
    ratings-v1-fd78f799f-mhp49        2/2     Running   0          3m35s
    reviews-v1-6549ddccc5-675t5       2/2     Running   0          3m35s
    reviews-v2-76c4865449-24pmj       2/2     Running   0          3m36s
    reviews-v3-6b554c875-gn2d6        2/2     Running   0          3m36s

*  验证：

通过检查返回的页面标题，来验证应用是否已在集群中运行，并已提供网页服务：

kubectl exec "$(kubectl get pod -l app=ratings -o jsonpath='{.items[0].metadata.name}')" -c ratings -- curl -s productpage:9080/productpage | grep -o "<title>.*</title>"
    
    <title>Simple Bookstore App</title>

*  对外开放应用程序：

此时，BookInfo 应用已经部署，但还不能被外界访问。 要开放访问，你需要创建 Istio 入站网关（Ingress Gateway）, 它会在网格边缘把一个路径映射到路由。

kubectl apply -f samples/bookinfo/networking/bookinfo-gateway.yaml

istioctl analyze                #确保配置文件没有问题
    
    ✔ No validation issues found when analyzing namespace: default.

*  确定入站 IP 和端口：

按照说明，为访问网关设置两个变量：`INGRESS_HOST` 和 `INGRESS_PORT`。

执行下面命令进行判断：Kubernetes 集群环境是否支持外部负载均衡：

kubectl get svc istio-ingressgateway -n istio-system
    
    NAME                   TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)                                                                      AGE
    istio-ingressgateway   LoadBalancer   10.105.62.5   <pending>     15021:31847/TCP,80:30108/TCP,443:31550/TCP,15012:31559/TCP,15443:31955/TCP   43m

由于 `EXTERNAL-IP` 一直显示为 `<pending>`，所以当前环境中没有提供可作为入站流量网关的外部负载均衡，这样可以选择一个节点端口来代替。

设置入站的端口：

export INGRESS_PORT=$(kubectl get service -n istio-system istio-ingressgateway -o jsonpath='{ .spec.ports[?(@.name=="http2")].nodePort}') export SECURE_INGRESS_PORT=$(kubectl get service -n istio-system istio-ingressgateway -o jsonpath='{ .spec.ports[?(@.name=="https")].nodePort}')

设置入站的 IP：

export INGRESS_HOST=$(kubectl get pod -l istio=ingressgateway -n istio-system -o jsonpath='{.items[0].status.hostIP}')

设置环境变量 GATEWAY\_URL:

export GATEWAY_URL=$INGRESS_HOST:$INGRESS_PORT
    
    echo "$GATEWAY_URL"
    
    192.168.30.130:30108

*  验证外部访问：

用浏览器查看 Bookinfo 应用的产品页面，验证 Bookinfo 已经实现了外部访问。  
运行下面命令，获取 Bookinfo 应用的外部访问地址。

echo "http://$GATEWAY_URL/productpage"
    
    http://192.168.30.130:30108/productpage

把上面命令的输出地址复制粘贴到浏览器并访问，确认 Bookinfo 应用的产品页面是否可以打开。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pc3MxMTgxMjQ4OTgz_size_16_color_FFFFFF_t_70_pic_center]

*  查看仪表板：

Istio 和几个遥测应用做了集成。遥测能帮助了解服务网格的结构、展示网络的拓扑结构、分析网格的健康状态。

使用下面说明部署 Kiali 仪表板、Prometheus、Grafana 以及 Jaeger。

安装 Kiali 和其他插件：

kubectl apply -f samples/addons             #报错则运行两次
    
    kubectl rollout status deployment/kiali -n istio-system

访问 Kiali 仪表板：

istioctl dashboard kiali
    
    http://localhost:20001/kiali
    Failed to open browser; open http://localhost:20001/kiali in your browser.

netstat -lntp |grep 20001
     
    tcp        0      0 127.0.0.1:20001         0.0.0.0:*               LISTEN      60323/istioctl      
    tcp6       0      0 ::1:20001               :::*                    LISTEN      60323/istioctl

由于此处是虚拟机，所以浏览器无法访问虚拟机上绑定 127.0.0.1 的端口，因此需要做转发。

yum install -y nginx
    
    vim /etc/nginx/conf.d/kiali.conf

server { 
        listen 20002;
        server_name 192.168.30.128;
    
        access_log /var/log/nginx/kiali.access.log main;
        error_log /var/log/nginx/kiali.error.log;
    
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Headers X-Requested-With;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
    
        location / { 
            proxy_pass http://localhost:20001;
            proxy_set_header Origin "" ;
            proxy_set_header X-Forwarded-Host $host:$server_port;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_connect_timeout 120s;
            proxy_read_timeout    120s;
            proxy_send_timeout    120s;
        }
    }

systemctl enable nginx && systemctl start nginx

访问 `http://192.168.30.128:20002/kiali`，

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pc3MxMTgxMjQ4OTgz_size_16_color_FFFFFF_t_70_pic_center 1]

Kiali 仪表板展示了网格的概览、以及 Bookinfo 示例应用的各个服务之间的关系，它还提供过滤器来可视化流量的流动。在左侧的导航菜单，选择 `Graph` ，然后在 `Namespace` 下拉列表中，选择 `default`。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pc3MxMTgxMjQ4OTgz_size_16_color_FFFFFF_t_70_pic_center 2]

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