安装Istio

墨蓝 2023-01-02 13:25 192阅读 0赞

# 一、概述 #

在安装 Istio 之前，需要一个运行着 Kubernetes 的兼容版本的 cluster。

Istio 1.8 已经在 Kubernetes 版本 1.16, 1.17, 1.18, 1.19 中测试过。

*  通过选择合适的 [platform-specific setup instructions][] 来创建一个集群。

有些平台提供了 managed control plane，您可以使用它来代替手动安装 Istio。如果您选择的平台支持这种方式，并且您选择使用它，那么，在创建完集群后，您将完成 Istio 的安装。因此，可以跳过以下说明。

# 二、下载 Istio #

## 环境说明 ##

操作系统：centos 7.6  
主机名：k8s-master  
ip地址：192.168.31.236  
配置：2核2g

操作系统：centos 7.6  
主机名：k8s-node01  
ip地址：192.168.31.16  
配置：2核4g

下载 Istio，下载内容将包含：安装文件、示例和 [istioctl][] 命令行工具。

1. 访问 Istio release 页面下载与您操作系统对应的安装文件。在 macOS 或 Linux 系统中，也可以通过以下命令下载最新版本的 Istio：**注意：官方文档给的命令：**

curl -L https://istio.io/downloadIstio | sh -

**是无法执行的，提示：curl: (7) Failed connect to raw.githubusercontent.com:443; 拒绝连接**

下载最新版本：1.81.1

wget https://github.com/istio/istio/releases/download/1.8.1/istio-1.8.1-linux-amd64.tar.gz
    tar zxvf istio-1.8.1-linux-amd64.tar.gz -C /usr/local/

设置环境变量

echo 'export ISTIO_HOME=/usr/local/istio-1.8.1' >> /etc/profile
    echo 'export PATH=$PATH:$ISTIO_HOME/bin' >> /etc/profile

加载变量

source /etc/profile

查看版本

istioctl version

## 使用 istioctl 的安装方式 ##

在学习、实验环境我们可以选择 demo 这个 profile 进行安装，如下示例：

istioctl install --set profile=demo -y

查看istio相应的 namespace 和 pod 是否已经正常创建：

[root@k8s-master ~]# kubectl get ns |grep istio
    istio-system      Active   82m

查看pods

[root@k8s-master ~]# kubectl get pods -n istio-system
    NAME                                    READY   STATUS    RESTARTS   AGE
    istio-egressgateway-6f9f4ddc9c-2sjgk    1/1     Running   0          2m33s
    istio-ingressgateway-78b47bc88b-85fd8   1/1     Running   0          2m33s
    istiod-67dbfcd4dd-qq5kg                 1/1     Running   0          3m7s

检查 istio 的 CRD 和 API 资源：

[root@k8s-master ~]# kubectl get crd |grep istio
    authorizationpolicies.security.istio.io    2021-01-04T10:10:26Z
    destinationrules.networking.istio.io       2021-01-04T10:10:26Z
    envoyfilters.networking.istio.io           2021-01-04T10:10:26Z
    gateways.networking.istio.io               2021-01-04T10:10:26Z
    istiooperators.install.istio.io            2021-01-04T10:10:26Z
    peerauthentications.security.istio.io      2021-01-04T10:10:26Z
    requestauthentications.security.istio.io   2021-01-04T10:10:26Z
    serviceentries.networking.istio.io         2021-01-04T10:10:26Z
    sidecars.networking.istio.io               2021-01-04T10:10:26Z
    virtualservices.networking.istio.io        2021-01-04T10:10:26Z
    workloadentries.networking.istio.io        2021-01-04T10:10:27Z
    workloadgroups.networking.istio.io         2021-01-04T10:10:27Z
    [root@k8s-master ~]#
    [root@k8s-master ~]# kubectl api-resources |grep istio
    istiooperators                    iop,io       install.istio.io               true         IstioOperator
    destinationrules                  dr           networking.istio.io            true         DestinationRule
    envoyfilters                                   networking.istio.io            true         EnvoyFilter
    gateways                          gw           networking.istio.io            true         Gateway
    serviceentries                    se           networking.istio.io            true         ServiceEntry
    sidecars                                       networking.istio.io            true         Sidecar
    virtualservices                   vs           networking.istio.io            true         VirtualService
    workloadentries                   we           networking.istio.io            true         WorkloadEntry
    workloadgroups                    wg           networking.istio.io            true         WorkloadGroup
    authorizationpolicies                          security.istio.io              true         AuthorizationPolicy
    peerauthentications               pa           security.istio.io              true         PeerAuthentication
    requestauthentications            ra           security.istio.io              true         RequestAuthentication
    [root@k8s-master ~]#

添加一个命名空间标签，让Istio在之后部署应用程序时自动注入 Envoy 的 SideCar 代理：

[root@k8s-master ~]# kubectl label namespace default istio-injection=enabled
    namespace/default labeled
    [root@k8s-master ~]#

安装 dashboard 组件。命令如下：

kubectl apply -f /usr/local/istio-1.8.1/samples/addons -n istio-system

输出：

serviceaccount/grafana created
    configmap/grafana created
    service/grafana created
    deployment.apps/grafana created
    configmap/istio-grafana-dashboards created
    configmap/istio-services-grafana-dashboards created
    deployment.apps/jaeger created
    service/tracing created
    service/zipkin created
    service/jaeger-collector created
    customresourcedefinition.apiextensions.k8s.io/monitoringdashboards.monitoring.kiali.io created
    serviceaccount/kiali created
    configmap/kiali created
    clusterrole.rbac.authorization.k8s.io/kiali-viewer created
    clusterrole.rbac.authorization.k8s.io/kiali created
    clusterrolebinding.rbac.authorization.k8s.io/kiali created
    service/kiali created
    deployment.apps/kiali created
    serviceaccount/prometheus created
    configmap/prometheus created
    clusterrole.rbac.authorization.k8s.io/prometheus created
    clusterrolebinding.rbac.authorization.k8s.io/prometheus created
    service/prometheus created
    deployment.apps/prometheus created
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"
    unable to recognize "/usr/local/istio-1.8.1/samples/addons/kiali.yaml": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"

本文参考链接：

[https://istio.io/latest/zh/docs/setup/getting-started/][https_istio.io_latest_zh_docs_setup_getting-started]

[platform-specific setup instructions]: https://istio.io/latest/zh/docs/setup/platform-setup/
[istioctl]: https://istio.io/latest/zh/docs/reference/commands/istioctl/
[https_istio.io_latest_zh_docs_setup_getting-started]: https://istio.io/latest/zh/docs/setup/getting-started/