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Create istio.md
Eamon
jmgao
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title: "Istio 1.0.3 安装 "
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date: 2018-11-12T13:44:34+08:00
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draft: false
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---
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#### Service Mesh(服务网格)
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---
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Kubernetes 已经给我们带来了诸多的好处。但是仍有些需求比如 A/B 测试、金丝雀发布、限流、访问控制,端到端认证等需要运维人员进一步去解决。
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Istio 是完全开源的服务网格,提供了一套完整的解决方案，可以透明地分层到现有的分布式应用程序上。对开发人员几乎无感的同时获得超能力。
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如果想要现有的服务支持 Istio，只需要在当前的环境中部署一个特殊的 sidecar 代理，即可。
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##### 前提
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----
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- 安装 Kubernetes 集群 1.9+
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- [安装 Helm](./helm.md)
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##### 准备
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----
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进入 [Istio release](https://github.com/istio/istio/releases) 页面下载最新版安装包(1.0.3)并解压到当前目录,
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```
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curl -L https://git.io/getLatestIstio | sh -
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ll istio-1.0.3/
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total 28
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drwxr-xr-x 2 root root 22 10月 26 07:36 bin
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drwxr-xr-x 6 root root 79 10月 26 07:36 install
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-rw-r--r-- 1 root root 648 10月 26 07:36 istio.VERSION
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-rw-r--r-- 1 root root 11343 10月 26 07:36 LICENSE
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-rw-r--r-- 1 root root 5817 10月 26 07:36 README.md
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drwxr-xr-x 12 root root 212 10月 26 07:36 samples
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drwxr-xr-x 8 root root 4096 10月 26 07:36 tools
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```
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- install Kubernetes 安装所需的 .yaml 文件
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- samples Task中的示例应用
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- bin/istioctl 客户端工具
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- istio.VERSION 配置文件
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#### 安装
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---
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##### 安装 istio
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注意事项
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Istio 默认使用‘负载均衡器’服务对象类型。对于裸机安装没有负载均衡器的情况下，安装需指定‘NodePort’类型。
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```
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helm install --name istio install/kubernetes/helm/istio --namespace istio-system --set gateways.istio-ingressgateway.type=NodePort --set gateways.istio-egressgateway.type=NodePort
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```
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##### 验证
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```
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kubectl get pod -n istio-system
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NAME READY STATUS RESTARTS AGE
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istio-citadel-6955bc9cb7-qh846 1/1 Running 0 3d22h
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istio-egressgateway-7dc5cbbc56-k4cgh 1/1 Running 0 3d22h
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istio-galley-545b6b8f5b-k7ssx 1/1 Running 0 3d22h
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istio-ingressgateway-7958d776b5-ptdsc 1/1 Running 0 3d22h
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istio-pilot-56bfdbffff-mtcn6 2/2 Running 0 3d22h
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istio-policy-5c689f446f-6bzlq 2/2 Running 0 3d15h
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istio-policy-5c689f446f-dvmfq 2/2 Running 0 3d22h
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istio-policy-5c689f446f-f2kl8 2/2 Running 0 3d3h
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istio-policy-5c689f446f-nfv2l 2/2 Running 0 3d1h
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istio-policy-5c689f446f-qdtql 2/2 Running 0 3d2h
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istio-sidecar-injector-99b476b7b-dt24k 1/1 Running 0 3d22h
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istio-telemetry-55d68b5dfb-52ftl 2/2 Running 0 3d22h
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istio-telemetry-55d68b5dfb-dvdvz 2/2 Running 0 3d22h
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istio-telemetry-55d68b5dfb-ln2sr 2/2 Running 0 3d
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istio-telemetry-55d68b5dfb-m2mb8 2/2 Running 0 3d
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istio-telemetry-55d68b5dfb-sjgq8 2/2 Running 0 3d
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prometheus-65d6f6b6c-dsv26 1/1 Running 0 3d22h
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```
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```
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kubectl get svc -n istio-system
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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istio-citadel ClusterIP 10.68.7.100 <none> 8060/TCP,9093/TCP 3d22h
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istio-egressgateway NodePort 10.68.67.237 <none> 80:30060/TCP,443:38194/TCP 3d22h
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istio-galley ClusterIP 10.68.12.54 <none> 443/TCP,9093/TCP 3d22h
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istio-ingressgateway NodePort 10.68.87.79 <none> 80:31380/TCP,443:31390/TCP,31400:31400/TCP,15011:31812/TCP,8060:30957/TCP,853:23011/TCP,15030:22292/TCP,15031:23663/TCP 3d22h
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istio-pilot ClusterIP 10.68.84.101 <none> 15010/TCP,15011/TCP,8080/TCP,9093/TCP 3d22h
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istio-policy ClusterIP 10.68.94.206 <none> 9091/TCP,15004/TCP,9093/TCP 3d22h
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istio-sidecar-injector ClusterIP 10.68.191.221 <none> 443/TCP 3d22h
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istio-telemetry ClusterIP 10.68.199.8 <none> 9091/TCP,15004/TCP,9093/TCP,42422/TCP 3d22h
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prometheus ClusterIP 10.68.91.13 <none> 9090/TCP
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```
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##### Sidecar 的自动注入
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注意事项
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需要在kube-apiserver 启动 admission-control 参数中加入 MutatingAdmissionWebhook 和 ValidatingAdmissionWebhook并确保正确的顺序,如果是多master安装，确保每个kube-apiserver都要进行修改。
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```
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/bin/kube-apiserver --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota,NodeRestriction,MutatingAdmissionWebhook,ValidatingAdmissionWebhook
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```
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重启 kube-apiserver 即可
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##### 部署应用验证
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istio 的samples目录中有很多示例。我们现在使用samples/sleep/sleep.yaml 来验证刚刚开启的Sidecar自动注入功能。
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进入目录 istio-1.0.3/ 部署一个新的应用
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```
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cd istio-1.0.3/
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kubectl apply -f samples/sleep/sleep.yaml
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kubectl get pod
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NAME READY STATUS RESTARTS AGE
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sleep-7549f66447-wv8cl 1/1 Running 0 1m
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```
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一切都是熟悉的味道。下面给 default 命名空间设置标签：istio-injection=enabled，这样就会在pod 创建时触发 Sidecar 的注入过程。从此default 名称空间拥有了超能力.
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```
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kubectl label namespace default istio-injection=enabled
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kubectl get namespace -L istio-injection
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NAME STATUS AGE ISTIO-INJECTION
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default Active 1h enabled
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istio-system Active 3d22h
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kube-public Active 4d2h
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kube-system Active 4d2h
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```
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接下来删除上面创建的pod，观察下有什么变化。
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```
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kubectl delete pod sleep-7549f66447-wv8cl
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pod "sleep-7549f66447-wv8cl" deleted
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kubectl get pod
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NAME READY STATUS RESTARTS AGE
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sleep-7549f66447-x4td6 2/2 Running 0 37s
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```
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刚刚的pod里面现在已经拥有两个容器，进入pod一探究竟。
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```
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kubectl describe pod sleep-7549f66447-x4td6
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....
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Containers:
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sleep:
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....
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istio-proxy:
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....
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```
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多出了一个 istio-proxy 容器及其对应的存储卷
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#### 卸载istio
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---
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```
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helm delete --purge istio
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```
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