1.設置主機名
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node1
hostnamectl set-hostname k8s-node2
2.關閉selinux及防火墻
setenforce 0
sed -ri '/^SELINUX=/c SELINUX=disabled' /etc/sysconfig/selinux 
sed -ri '/^SELINUX=/c SELINUX=disabled' /etc/selinux/config 
systemctl stop firewalld
systemctl disable firewalld

1.sealos官網獲取軟件包
[root@k8s-master1 ~]# ll
總用量 507472
-rw-r--r-- 1 root root  552591411 8月   5 2021 kube1.19.16.tar.gz
-rw-r--r-- 1 root root  44322816  4月  29 13:47 sealos
2.將kube1.19.16.tar.gz文件上傳到所有k8s節點
3.安裝sealos
[root@k8s-master1 ~/soft]# chmod +x sealos && mv sealos /usr/bin
[root@k8s-master1 ~/soft]# sealos version
Version: 3.3.9-rc.3
Last Commit: 4db4953
Build Date: 2021-04-10T11:25:04Z
4.部署K8S1.19.16版本
[root@k8s-master ~]# sealos init --passwd 'teacher' --master 192.168.20.10  --node 192.168.20.11  --node 192.168.20.12 --pkg-url /root/kube1.19.16.tar.gz --version v1.19.16

[root@k8s-master ~]# curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.8.2 TARGET_ARCH=x86_64 sh -

1.準備istio命令
[root@k8s-master ~]# cp istio-1.8.2/bin/istioctl /usr/bin/
2.查看可用的配置列表
[root@k8s-master ~]# istioctl profile list
Istio configuration profiles:
    default					#默認配置檔，功能豐富，建議生產使用
    demo					#快速入門使用，適中配置，不適合性能測試
    empty
    minimal					#功能最少的組件集配置
    openshift
    preview
    remote					#用于配置共享控制平面的多集群服務網格
3.指定安裝的配置檔
$ istioctl install --set profile=demo -y

1.安裝istio
[root@k8s-master ~]# istioctl install -y
Detected that your cluster does not support third party JWT authentication. Falling back to less secure first party JWT. See https://istio.io/v1.8/docs/ops/best-practices/security/#configure-third-party-service-account-tokens for details.
? Istio core installed
? Istiod installed                              
? Ingress gateways installed                              
? Installation complete        
2.查看istio在K8S集群創建的資源
[root@k8s-master ~]# kubectl get all -n istio-system
NAME                                        READY   STATUS    RESTARTS   AGE
pod/istio-ingressgateway-559f565fcd-jxn5b   1/1     Running   0          7m46s
pod/istiod-545bb98448-vqf84                 1/1     Running   0          12m

NAME                           TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)                                                                      AGE
service/istio-ingressgateway   LoadBalancer   10.107.107.206   <pending>     15021:32381/TCP,80:31105/TCP,443:30793/TCP,15012:32259/TCP,15443:31377/TCP   7m45s
service/istiod                 ClusterIP      10.109.130.252   <none>        15010/TCP,15012/TCP,443/TCP,15014/TCP                                        12m

NAME                                   READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/istio-ingressgateway   1/1     1            1           7m46s
deployment.apps/istiod                 1/1     1            1           12m

NAME                                              DESIRED   CURRENT   READY   AGE
replicaset.apps/istio-ingressgateway-559f565fcd   1         1         1       7m46s
replicaset.apps/istiod-545bb98448                 1         1         1       12m

NAME                                                       REFERENCE                         TARGETS         MINPODS   MAXPODS   REPLICAS   AGE
horizontalpodautoscaler.autoscaling/istio-ingressgateway   Deployment/istio-ingressgateway   <unknown>/80%   1         5         1          7m45s
horizontalpodautoscaler.autoscaling/istiod                 Deployment/istiod                 <unknown>/80%   1         5         1          12m

#程序部署了2個，分別是istiod以及istio-ingressgateway
#istio-ingressgateway的service資源通過loadblancer暴露了一組端口，我們可以通過這些端口訪問到istio中的應用程序，loadblancer需要依靠公有云的負載均衡器，我們沒有因此處于pending狀態，但是該service資源也是可用的，loadblancer不存在公有云負載均衡器默認就會使用nodeport類型進行端口映射

[root@k8s-master ~]# istioctl profile dump default

#顯示istio在k8s集群中部署使用的yaml編排文件內容
[root@k8s-master istio-1.8.2]# istioctl manifest generate 
#將編排文件內容導入到文件中
[root@k8s-master istio-1.8.2]# istioctl manifest generate > istio-generate.yaml
#后期不使用istio時，可以通過這個文件直接卸載istio
$ kubectl delete -f istio-generate.yaml