draft: kind basic

kkumtree · Sep 3, 2024 · 85e7f2b · 85e7f2b
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+---
+date: 2024-09-03T21:16:07+09:00
+title: "KIND 톺아보기"
+tags:
+ - kans  
+ - kind    
+ - kubernetes  
+authors:
+    - name: kkumtree
+      bio: plumber for infra
+      email: mscho7969@ubuntu.com
+      launchpad: mscho7969
+      github: kkumtree
+      profile: https://avatars.githubusercontent.com/u/52643858?v=4 
+image: kind_banner.png
+draft: true
+---
+
+> [톺아보다(우리말샘)](https://opendict.korean.go.kr/dictionary/view?sense_no=437729&viewType=confirm) 는 의외로 표준어라고 합니다.  
+
+[KIND 설치](../kans-2w-kind-installation-on-linux/) 이후에 기본적인 내용을 살펴봅니다.  
+
+## 0. $KUBECONFIG
+
+- $KUBECONFIG 환경변수가 없을 경우:  
+  보통은 `~/.kube` 디렉토리가 생성됩니다.  
+  확인해보니, config 값과 더불어, `cache` 디렉토리도 확인할 수 있었습니다.  
+
+  ```bash
+  ❯ find ~/.kube -maxdepth 2 -type f -exec ls -ld "{}" \;
+  -rw------- 1 kkumtree kkumtree 44 Sep  3 21:31 /home/kkumtree/.kube/config
+  ❯ find ~/.kube -maxdepth 2 -type d -exec ls -ld "{}" \;
+  drwxr-x--- 3 kkumtree kkumtree 4096 Sep  3 21:31 /home/kkumtree/.kube
+  drwxr-x--- 4 kkumtree kkumtree 4096 Sep  3 21:11 /home/kkumtree/.kube/cache
+  drwxr-x--- 5 kkumtree kkumtree 4096 Sep  3 21:28 /home/kkumtree/.kube/cache/discovery
+  drwxr-x--- 3 kkumtree kkumtree 4096 Sep  3 21:28 /home/kkumtree/.kube/cache/http
+  ```
+
+- KIND용 $KUBECONFIG 설정:  
+  그래서 아래처럼, 경로를 만들고 $KUBECONFIG 환경변수를 설정해주었습니다.
+
+  ```bash
+  mkdir -p ~/.kind
+  export KUBECONFIG=~/.kind/kubeconfig
+  ```
+
+- (참고) 변수로 좀 곯머리를 앓아서, 쉘스크립팅 예제를 짜봤습니다.  
+  <https://github.com/kkumtree/kans/blob/week2/kind-basic/kubeconfig_manager.sh>
+
+  ```bash
+  ❯ pwd
+  /home/kkumtree/Documents/github/kans/kind-basic
+  ❯ ll
+  total 4.0K
+  -rwxrwxr-x 1 kkumtree kkumtree 1.1K Sep  2 22:49 kubeconfig_manager.sh
+  ❯ . ./kubeconfig_manager.sh
+  ==============================
+  | kubeconfig manager for kind
+  ------------------------------
+  | $HOME: $$/home/kkumtree$$
+  | $KUBECONFIG: $$$$
+  ==============================
+  (Press Enter to confirm OR type custom path)
+  kubeconfig for kind [/home/kkumtree/.kind/kubeconfig]:
+  env KUBECONFIG is set to: $$/home/kkumtree/.kind/kubeconfig$$
+  ❯ . ./kubeconfig_manager.sh
+  env KUBECONFIG is unset
+  ```
+
+## 1. KIND 첫 구동
+
+- KIND는 이름 값대로 컨테이너 이미지를 사용합니다.  
+  그래서, 이미지가 로컬에 없다면 받는데 시간이 소요됩니다.  
+
+  ```bash
+  ❯ docker images
+  REPOSITORY     TAG       IMAGE ID       CREATED       SIZE
+  kindest/node   v1.30.4   ea9c94202240   2 weeks ago   991MB
+  ```    
+
+- 새로운 터미널을 한 쪽에 열어, 관측 준비를 합니다.
+
+  ```bash
+  watch kubectl get pod -A --sort-by=.metadata.creationTimestamp
+  ```
+
+- 사용 이미지 지정: `kindest/node:v1.30.4`  
+  v1.31은 앞으로 적용해볼 서비스들과 호환성을 탄다고 하여, 낮춰서 사용합니다.  
+
+  ```bash
+  ❯ kind create cluster --image kindest/node:v1.30.4
+  Creating cluster "kind" ...
+  ✓ Ensuring node image (kindest/node:v1.30.4) 🖼
+  ✓ Preparing nodes 📦
+  ✓ Writing configuration 📜
+  ✓ Starting control-plane 🕹️
+  ✓ Installing CNI 🔌
+  ✓ Installing StorageClass 💾
+  Set kubectl context to "kind-kind"
+  You can now use your cluster with:
+
+  kubectl cluster-info --context kind-kind
+
+  Thanks for using kind! 😊
+  ```  
+
+- 쉘  
+
+```bash
+❯ kubectl get pod -A --sort-by=.metadata.creationTimestamp
+NAMESPACE            NAME                                         READY   STATUS    RESTARTS   AGE
+kube-system          etcd-kind-control-plane                      1/1     Running   0          7m5s
+kube-system          kube-apiserver-kind-control-plane            1/1     Running   0          7m5s
+kube-system          kube-controller-manager-kind-control-plane   1/1     Running   0          7m5s
+kube-system          kube-scheduler-kind-control-plane            1/1     Running   0          7m5s
+kube-system          coredns-7db6d8ff4d-dtgmb                     1/1     Running   0          6m51s
+kube-system          coredns-7db6d8ff4d-zfsp2                     1/1     Running   0          6m51s
+kube-system          kindnet-4l5v8                                1/1     Running   0          6m51s
+kube-system          kube-proxy-gt6fw                             1/1     Running   0          6m51s
+local-path-storage   local-path-provisioner-7d4d9bdcc5-pw5b2      1/1     Running   0          6m51s
+```
+
+```bash
+❯ cat ~/.kind/kubeconfig
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: <base64encoded>
+    server: https://127.0.0.1:40305
+  name: kind-kind
+contexts:
+- context:
+    cluster: kind-kind
+    user: kind-kind
+  name: kind-kind
+current-context: kind-kind
+kind: Config
+preferences: {}
+users:
+- name: kind-kind
+  user:
+    client-certificate-data: <base64encoded> 
+    client-key-data: <base64encoded>
+```
+
+```bash
+❯ kind delete cluster
+Deleting cluster "kind" ...
+Deleted nodes: ["kind-control-plane"]
+❯ cat ~/.kind/kubeconfig
+apiVersion: v1
+kind: Config
+preferences: {}
+```