kubernetes中istio-1.0.0如何部署和试用

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一：简介

本文介绍如何在kubernetes1.10.4集群中部署istio-1.0.0 并试用istio自带的bookinfo实例应用。

二：安装

1.获取安装包

wget https://github.com/istio/istio/releases/download/1.0.0/istio-1.0.0-linux.tar.gz

tar -zxvf istio-1.0.0-linux.tar.gz

2.安装istioctl

如果手动注入sidecar的话需要使用这个命令:

cp istio-1.0./bin/istioctl /usr/local/bin/

设置环境变量：

ISTIO_HOME=/root/istio-1.0

PATH=$ISTIO_HOME/bin:$PATH

export  ISTIO_HOME  PATH 

3.安装istio核心组件

kubectl apply -f istio-1.0.0/install/kubernetes/istio-demo.yaml

gcr.io和quay.io相关的镜像下载不了的话可以替换为自己的镜像：

daocloud.io/liukuan73/proxy_init:1.0.0

daocloud.io/liukuan73/galley:1.0.0

daocloud.io/liukuan73/mixer:1.0.0

daocloud.io/liukuan73/proxyv2:1.0.0

daocloud.io/liukuan73/pilot:1.0.0

daocloud.io/liukuan73/citadel:1.0.0

daocloud.io/liukuan73/servicegraph:1.0.0

daocloud.io/liukuan73/sidecar_injector:1.0.0

daocloud.io/liukuan73/istio-grafana:1.0.0

4.安装结果验证

三：试用

1.sidecar自动注入配置

 Istio装好后，如果想sidecar在应用启动时自动注入到pod中，还需要配置如下4步：

a.安装istio-sidecar-injector

 安装了istio-sidecar-injector后，kubectl create起应用的时候sidecar容器会直接自动注入到pod中，而不用手动注入。

b.启用mutating webhook admission controller

在kube-apiserver的启动参数的admission controller中按正确顺序加入如下两个controller:MutatingAdmissionWebhook,ValidatingAdmissionWebhook

--admission-control=ServiceAccount,Initializers,NamespaceLifecycle,NamespaceExists,LimitRanger,DefaultStorageClass,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota

c.启用admissionregistration api

kubectl api-versions | grep admissionregistration

admissionregistration.k8s.io/v1beta1 

d.为需要自动注入sidecar的namespace打label

kubectl label namespace istio-test istio-injection=enabled

kubectl get namespace -L istio-injection

2.启动示例应用

a.示例结构

b.安装示例

kubectl apply -n istio-test -f istio-1.0.0/samples/bookinfo/platform/kube/bookinfo.yaml

c. 配置traefik Ingress

为了便于集群外访问验证，配置Ingress代理

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-ingress
  namespace: kube-system
spec:
  rules:
  - host: elasticsearch.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: elasticsearch-logging
          servicePort: 9200
  - host: kibana.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: kibana-logging
          servicePort: 5601
  - host: locust.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: locust-master
          servicePort: 8089
  - host: dashboard.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: kubernetes-dashboard
          servicePort: 32666
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: istio-ingress
  namespace: istio-system
spec:
  rules:
  - host: grafana.istio.donkey
    http:
      paths:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-ingress
  namespace: kube-system
spec:
  rules:
  - host: elasticsearch.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: elasticsearch-logging
          servicePort: 9200
  - host: kibana.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: kibana-logging
          servicePort: 5601
  - host: locust.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: locust-master
          servicePort: 8089
  - host: dashboard.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: kubernetes-dashboard
          servicePort: 32666
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: istio-ingress
  namespace: istio-system
spec:
  rules:
  - host: grafana.istio.donkey
    http:
      paths:
      - path: /
        backend:
          serviceName: grafana
          servicePort: 3000
  - host: zipkin.istio.donkey
    http:

3.示例验证

a.bookinfo 示例  http://productpage.donkey/productpage?u=normal

b.监控  http://grafana.istio.donkey

c.Prometheus页面 http://prometheus.istio.donkey

d.ServiceGraph页面

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