k3sでistioを動作させる

概要

軽量Kubernetesであるk3sにサービスメッシュIstioを適用する。
結論としては、失敗している。
→multipasのメモリ、CPU割り当てを増やす事でインストールの確認までできている。

環境

• OS : osx multipass上で動作するUbuntu
• k3s : 最新を取得（v1.22.5+k3s1）
• Istio : 最新を取得（istio-1.12.1）

手順

1. osxのターミナル上で、multipassによりubuntuを起動させ、シェルを起動する
   • multipass launch -n k3s-master --cpus 2 --mem 4g ※デフォルトだと1cpu、1memで作成されリソース不足になるので注意
   • multipass shell k3s-master

2. k3sをインストールする

   • curl -sfL https://get.k3s.io | sh -s - server --disable traefik

     [INFO]  Using v1.22.5+k3s1 as release
     [INFO]  systemd: Starting k3s
     

   • sudo chmod 775 /etc/rancher/k3s/k3s.yaml
   • mkdir ~/.kube
   • cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
     ※Istioがk3sにアクセスできるように、configファイルを移動する。

3. istioをインストールする

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

      
     Downloading istio-1.12.1 from https://github.com/istio/istio/releases/download/1.12.1/istio-1.12.1-linux-amd64.tar.gz ...
     Istio 1.12.1 Download Complete!
     Istio has been successfully downloaded into the istio-1.12.1 folder on your system.

   • export PATH="$PATH:/home/ubuntu/istio-1.12.1/bin"
   • istioctl version

     client version: 1.12.1
     control plane version: 1.12.1
     data plane version: 1.12.1 (2 proxies)

   • istioctl x precheck

     ✔ No issues found when checking the cluster. Istio is safe to install or upgrade!
     To get started, check out https://istio.io/latest/docs/setup/getting-started/

   • istioctl install --set profile=demo

     ✔ Istio core installed
     ✔ Istiod installed
     ✔ Egress gateways installed
     ✔ Ingress gateways installed
     ✔ Installation complete
     Making this installation the default for injection and validation.
     Thank you for installing Istio 1.12.  Please take a few minutes to tell us about your install/upgrade experience!  https://forms.gle/FegQbc9UvePd4Z9z7
     

   • kubectl -n istio-system get all

     NAME                                        READY   STATUS    RESTARTS   AGE
     pod/istiod-76d66d9876-fkmjh                 1/1     Running   0          2m50s
     pod/svclb-istio-ingressgateway-jp59n        5/5     Running   0          2m14s
     pod/istio-ingressgateway-78f69bd5db-zwkvb   1/1     Running   0          2m15s
     pod/istio-egressgateway-687f4db598-jjfj7    1/1     Running   0          2m15s
     

4. サンプルアプリケーションをデプロイ

   • kubectl apply -f samples/bookinfo/platform/kube/bookinfo.yaml

     service/details created
     serviceaccount/bookinfo-details created
     deployment.apps/details-v1 created
     service/ratings created
     serviceaccount/bookinfo-ratings created
     deployment.apps/ratings-v1 created
     service/reviews created
     serviceaccount/bookinfo-reviews created
     deployment.apps/reviews-v1 created
     deployment.apps/reviews-v2 created
     deployment.apps/reviews-v3 created
     service/productpage created
     serviceaccount/bookinfo-productpage created
     deployment.apps/productpage-v1 created

   • kubectl get services

     NAME          TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
     kubernetes    ClusterIP   10.43.0.1               443/TCP    5m36s
     details       ClusterIP   10.43.250.211           9080/TCP   24s
     ratings       ClusterIP   10.43.128.103           9080/TCP   24s
     reviews       ClusterIP   10.43.252.163           9080/TCP   23s
     productpage   ClusterIP   10.43.12.119            9080/TCP   23s
     

   • kubectl get pods

     NAME                              READY   STATUS            RESTARTS   AGE
     ratings-v1-b6994bb9-tfcth         0/2     PodInitializing   0          42s
     details-v1-79f774bdb9-btrng       0/2     PodInitializing   0          43s
     reviews-v1-545db77b95-f69kc       0/2     PodInitializing   0          42s
     reviews-v2-7bf8c9648f-z4sgl       0/2     PodInitializing   0          42s
     reviews-v3-84779c7bbc-cjtcj       0/2     PodInitializing   0          42s
     productpage-v1-6b746f74dc-p76xs   0/2     PodInitializing   0          41s

参考