kubeasz/docs/guide/istio.md

238 lines
11 KiB
Markdown
Raw Normal View History

2018-11-12 15:43:16 +08:00
---
2019-04-23 18:29:27 +08:00
title: "Istio 1.1.3 安装 "
date: 2019-04-16T20:26:00+08:00
2018-11-12 15:43:16 +08:00
---
#### Service Mesh(服务网格)
---
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。
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。
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。
##### 前提
----
- 安装 Kubernetes 集群 1.9+
2018-11-12 15:57:23 +08:00
- [安装 Helm](./helm.md)
2018-11-12 15:43:16 +08:00
##### 准备
----
2019-04-23 18:29:27 +08:00
进入 [Istio release](https://github.com/istio/istio/releases) 页面下载最新版安装包并解压到当前目录,
2018-11-12 15:43:16 +08:00
```
curl -L https://git.io/getLatestIstio | sh -
2019-04-23 18:29:27 +08:00
ll istio-1.1.3/
2018-11-12 15:43:16 +08:00
total 28
2019-04-23 18:29:27 +08:00
drwxr-xr-x 2 root root 22 Apr 13 06:36 bin
drwxr-xr-x 6 root root 79 Apr 13 06:36 install
-rw-r--r-- 1 root root 602 Apr 13 06:36 istio.VERSION
-rw-r--r-- 1 root root 11343 Apr 13 06:36 LICENSE
-rw-r--r-- 1 root root 5921 Apr 13 06:36 README.md
drwxr-xr-x 15 root root 241 Apr 13 06:36 samples
drwxr-xr-x 7 root root 4096 Apr 13 06:36 tools
2018-11-12 15:43:16 +08:00
```
- install Kubernetes 安装所需的 .yaml 文件
- samples Task中的示例应用
- bin/istioctl 客户端工具
- istio.VERSION 配置文件
#### 安装
2019-04-23 18:29:27 +08:00
----
2018-11-12 15:43:16 +08:00
注意事项
2019-04-23 18:29:27 +08:00
- Node 节点内存不能低于 4G否则相关容器可能启动失败
- 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。
2018-11-12 15:43:16 +08:00
2019-04-23 18:29:27 +08:00
##### 方案1使用 Helm template 进行安装
```bash
cd /usr/local/src/istio-1.1.3
kubectl create namespace istio-system
# 安装 istio-init chart来启动 Istio CRD 的安装过程
helm template install/kubernetes/helm/istio-init --name istio-init --namespace istio-system --set gateways.istio-ingressgateway.type=NodePort --set gateways.istio-egressgateway.type=NodePort | kubectl apply -f -
# 稍等一会儿执行
# 输出 53 或者 58 (若开启了 cert-manager
kubectl get crds | grep 'istio.io\|certmanager.k8s.io' | wc -l
# 部署与你选择的配置文件相对应的 Istio 的核心组件
# 不同配置说明 https://istio.io/zh/docs/setup/kubernetes/additional-setup/config-profiles/
# 选择 default 配置
helm template install/kubernetes/helm/istio --name istio --namespace istio-system \
--set gateways.istio-ingressgateway.type=NodePort \
--set gateways.istio-egressgateway.type=NodePort | kubectl apply -f -
2019-04-26 17:20:15 +08:00
# 或选择 demo 配置
2019-04-23 18:29:27 +08:00
helm template install/kubernetes/helm/istio --name istio --namespace istio-system \
--set gateways.istio-ingressgateway.type=NodePort \
--set gateways.istio-egressgateway.type=NodePort \
--values install/kubernetes/helm/istio/values-istio-demo.yaml | kubectl apply -f -
2018-11-12 15:43:16 +08:00
```
2019-04-23 18:29:27 +08:00
##### 方案2在 Helm 和 Tiller 的环境中使用 helm install 命令进行安装
见[官方文档](https://istio.io/zh/docs/setup/kubernetes/install/helm/#%E6%96%B9%E6%A1%88-2-%E5%9C%A8-helm-%E5%92%8C-tiller-%E7%9A%84%E7%8E%AF%E5%A2%83%E4%B8%AD%E4%BD%BF%E7%94%A8-helm-install-%E5%91%BD%E4%BB%A4%E8%BF%9B%E8%A1%8C%E5%AE%89%E8%A3%85)
2018-11-12 15:43:16 +08:00
##### 验证
2019-04-23 18:29:27 +08:00
```bash
# default 配置时
2018-11-12 15:43:16 +08:00
kubectl get pod -n istio-system
NAME READY STATUS RESTARTS AGE
2019-04-23 18:29:27 +08:00
istio-citadel-899dfb67c-5hlsc 1/1 Running 0 49s
istio-cleanup-secrets-1.1.3-nkdxt 0/1 Completed 0 50s
istio-galley-555dd7c7d7-rpfln 1/1 Running 0 49s
istio-ingressgateway-5b547dfb7b-ctm5l 1/1 Running 0 49s
istio-init-crd-10-l9xcj 0/1 Completed 0 66s
istio-init-crd-11-nqvml 0/1 Completed 0 66s
istio-pilot-9f5c75ddf-n5s6p 2/2 Running 0 49s
istio-policy-bd45d757d-6qcdg 2/2 Running 1 49s
istio-security-post-install-1.1.3-nbwwv 0/1 Completed 0 50s
istio-sidecar-injector-998dd6cbb-n2hdm 1/1 Running 0 49s
istio-telemetry-656df5b64-k8vkf 2/2 Running 1 49s
prometheus-7f87866f5f-t97wc 1/1 Running 0 49s
# demo 配置时
grafana-749c78bcc5-fbzmn 1/1 Running 0 101s
istio-citadel-899dfb67c-8shx2 1/1 Running 0 100s
istio-cleanup-secrets-1.1.3-jbhsl 0/1 Completed 0 102s
istio-egressgateway-748d5fd794-x5bjt 1/1 Running 0 101s
istio-galley-555dd7c7d7-86r2b 1/1 Running 0 101s
istio-grafana-post-install-1.1.3-kq7b4 0/1 Completed 0 103s
istio-ingressgateway-55dd86767f-jd9m4 1/1 Running 0 101s
istio-init-crd-10-l9xcj 0/1 Completed 0 16m
istio-init-crd-11-nqvml 0/1 Completed 0 16m
istio-pilot-6964dd4957-7bzdq 2/2 Running 0 101s
istio-policy-689687bd77-ncw2n 2/2 Running 1 101s
istio-security-post-install-1.1.3-t2kwh 0/1 Completed 0 102s
istio-sidecar-injector-998dd6cbb-7mwkh 1/1 Running 0 100s
istio-telemetry-8564679887-59c8z 2/2 Running 1 101s
istio-tracing-595796cf54-jn49s 1/1 Running 0 100s
kiali-5df77dc9b6-psjs4 1/1 Running 0 101s
prometheus-7f87866f5f-hrbgt 1/1 Running 0 100s
```
```bash
2018-11-12 15:43:16 +08:00
kubectl get svc -n istio-system
2019-04-23 18:29:27 +08:00
# default 配置时
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
istio-citadel ClusterIP 10.68.236.249 <none> 8060/TCP,15014/TCP 75s
istio-galley ClusterIP 10.68.105.102 <none> 443/TCP,15014/TCP,9901/TCP 75s
istio-ingressgateway NodePort 10.68.181.46 <none> 15020:32761/TCP,80:31380/TCP,443:31390/TCP,31400:31400/TCP,15029:33185/TCP,15030:20745/TCP,15031:36208/TCP,15032:34095/TCP,15443:36244/TCP 75s
istio-pilot ClusterIP 10.68.252.143 <none> 15010/TCP,15011/TCP,8080/TCP,15014/TCP 75s
istio-policy ClusterIP 10.68.40.51 <none> 9091/TCP,15004/TCP,15014/TCP 75s
istio-sidecar-injector ClusterIP 10.68.55.134 <none> 443/TCP 74s
istio-telemetry ClusterIP 10.68.16.11 <none> 9091/TCP,15004/TCP,15014/TCP,42422/TCP 75s
prometheus ClusterIP 10.68.65.238 <none> 9090/TCP 75s
# demo 配置时
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
grafana ClusterIP 10.68.65.248 <none> 3000/TCP 2m27s
istio-citadel ClusterIP 10.68.72.100 <none> 8060/TCP,15014/TCP 2m26s
istio-egressgateway NodePort 10.68.21.24 <none> 80:26775/TCP,443:28249/TCP,15443:38494/TCP 2m27s
istio-galley ClusterIP 10.68.73.9 <none> 443/TCP,15014/TCP,9901/TCP 2m27s
istio-ingressgateway NodePort 10.68.122.190 <none> 15020:39248/TCP,80:31380/TCP,443:31390/TCP,31400:31400/TCP,15029:33522/TCP,15030:26010/TCP,15031:27064/TCP,15032:32158/TCP,15443:30848/TCP 2m27s
istio-pilot ClusterIP 10.68.116.5 <none> 15010/TCP,15011/TCP,8080/TCP,15014/TCP 2m26s
istio-policy ClusterIP 10.68.239.246 <none> 9091/TCP,15004/TCP,15014/TCP 2m27s
istio-sidecar-injector ClusterIP 10.68.93.151 <none> 443/TCP 2m26s
istio-telemetry ClusterIP 10.68.117.254 <none> 9091/TCP,15004/TCP,15014/TCP,42422/TCP 2m26s
jaeger-agent ClusterIP None <none> 5775/UDP,6831/UDP,6832/UDP 2m25s
jaeger-collector ClusterIP 10.68.103.8 <none> 14267/TCP,14268/TCP 2m26s
jaeger-query ClusterIP 10.68.73.252 <none> 16686/TCP 2m26s
kiali ClusterIP 10.68.214.228 <none> 20001/TCP 2m27s
prometheus ClusterIP 10.68.203.209 <none> 9090/TCP 2m26s
tracing ClusterIP 10.68.113.236 <none> 80/TCP 2m25s
zipkin ClusterIP 10.68.96.189 <none> 9411/TCP 2m25s
2018-11-12 15:43:16 +08:00
```
##### Sidecar 的自动注入
注意事项
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。
##### 部署应用验证
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。
2019-04-23 18:29:27 +08:00
进入目录 istio-1.1.3/ 部署一个新的应用
2018-11-12 15:43:16 +08:00
2019-04-23 18:29:27 +08:00
```bash
cd istio-1.1.3/
2018-11-12 15:43:16 +08:00
kubectl apply -f samples/sleep/sleep.yaml
kubectl get pod
NAME READY STATUS RESTARTS AGE
sleep-7549f66447-wv8cl 1/1 Running 0 1m
```
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.
2019-04-23 18:29:27 +08:00
```bash
2018-11-12 15:43:16 +08:00
kubectl label namespace default istio-injection=enabled
kubectl get namespace -L istio-injection
NAME STATUS AGE ISTIO-INJECTION
default Active 1h enabled
istio-system Active 3d22h
kube-public Active 4d2h
kube-system Active 4d2h
```
接下来删除上面创建的pod观察下有什么变化。
2019-04-23 18:29:27 +08:00
```bash
2018-11-12 15:43:16 +08:00
kubectl delete pod sleep-7549f66447-wv8cl
pod "sleep-7549f66447-wv8cl" deleted
kubectl get pod
NAME READY STATUS RESTARTS AGE
sleep-7549f66447-x4td6 2/2 Running 0 37s
```
2019-04-23 18:29:27 +08:00
2018-11-12 15:43:16 +08:00
刚刚的pod里面现在已经拥有两个容器进入pod一探究竟。
2019-04-23 18:29:27 +08:00
```bash
2018-11-12 15:43:16 +08:00
kubectl describe pod sleep-7549f66447-x4td6
....
Containers:
sleep:
....
istio-proxy:
....
```
2019-04-23 18:29:27 +08:00
多出了一个 `istio-proxy` 容器及其对应的存储卷
2018-11-12 15:43:16 +08:00
#### 卸载istio
---
2019-04-23 18:29:27 +08:00
```bash
2019-04-26 17:20:15 +08:00
# 采用 default 配置安装
helm template install/kubernetes/helm/istio --name istio --namespace istio-system | kubectl delete -f -
# 采用 demo 配置安装
helm template install/kubernetes/helm/istio --name istio --namespace istio-system \
--values install/kubernetes/helm/istio/values-istio-demo.yaml | kubectl delete -f -
2018-11-12 15:43:16 +08:00
2019-04-26 17:20:15 +08:00
kubectl delete namespace istio-system
2018-11-12 15:43:16 +08:00
```