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chore: reorganize all image files and linted documents (#80)

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Sungchan Yi
2023-09-10 17:38:27 +09:00
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_posts/Development/Kubernetes/2021-03-07-02-first-steps.md
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@@ -7,14 +7,17 @@ title: "02. First Steps with Docker and Kubernetes"
date: "2021-03-07"
github_title: "2021-03-07-02-first-steps"
image:
path: /assets/img/posts/k8s-02.jpeg
path: /assets/img/posts/Development/Kubernetes/k8s-02.jpeg
attachment:
folder: assets/img/posts/Development/Kubernetes
---
![k8s-02.jpeg](../../../assets/img/posts/k8s-02.jpeg) _Running a container image in Kubernetes (출처: https://livebook.manning.com/book/kubernetes-in-action/chapter-2)_
![k8s-02.jpeg](../../../assets/img/posts/Development/Kubernetes/k8s-02.jpeg) _Running a container image in Kubernetes (출처: https://livebook.manning.com/book/kubernetes-in-action/chapter-2)_
도커와 쿠버네티스를 사용하여 간단한 애플리케이션을 배포해 보자!
## 2.1 컨테이너 이미지 생성, 실행, 공유하기
---
### 2.1.1 도커 설치
@@ -38,8 +41,8 @@ $ docker run <IMAGE>:[TAG] [COMMAND]
- 우선 해당 이미지의 latest version (`IMAGE:latest`) 가 로컬에 있는지 확인한다. 없으면 Docker Hub 에서 다운받는다.
- 이미지로부터 컨테이너를 생성하고 `[COMMAND]` 를 실행한다.
매 번 `docker run` 을 할 때마다 실행할 명령을 입력하는 것은 불편하므로 보통은 Dockerfile 을 사용해서 실행할 명령을 이미지 생성 과정에 포함시킨다.
매 번 `docker run` 을 할 때마다 실행할 명령을 입력하는 것은 불편하므로 보통은 Dockerfile 을 사용해서 실행할 명령을 이미지 생성 과정에 포함시킨다.
이미지도 업데이트 될 수 있기 때문에, 이름은 유지한 채 tag 를 업데이트하여 버전을 관리한다. `latest` 태그는 당연히 이미지의 최신 버전을 가리킨다.
### 2.1.2 Creating a trivial Node.js app
@@ -137,7 +140,7 @@ $ docker rm <CONTAINER> # 삭제
컨테이너를 정지하게 되면 그 잔해가 남아있게 되는데, `rm` 을 이용해 삭제해주면 완전히 제거된다.
정지한 컨테이너는 `docker ps` 로 확인이 불가능하므로 (실행 중인 컨테이너만 보인다), `docker ps -a` 로 확인한다.
정지한 컨테이너는 `docker ps` 로 확인이 불가능하므로 (실행 중인 컨테이너만 보인다), `docker ps -a` 로 확인한다.
### 2.1.8 이미지 레지스트리에 이미지 push 하기
@@ -155,6 +158,7 @@ $ docker tag <SOURCE_IMAGE:TAG> <TARGET_IMAGE:TAG>
`docker login` 으로 로그인 한 뒤, `docker push <NAME:TAG>` 으로 이미지를 push 할 수 있다. 당연히 그 반대인 `docker pull` 도 가능하다.
## 2.2 쿠버네티스 클러스터 설정
---
일단 로컬에서 하려면 Minikube 를 설치하면 된다.
@@ -203,8 +207,8 @@ $ kubectl describe node <NAME>
`bash-completion` 을 사용하면 편리하다고 한다.
## 2.3 Kubernetes 에서 앱 실행하기
---
### 2.3.1 Node.js 앱 배포하기
@@ -235,7 +239,7 @@ $ kubectl get pods
- `kubectl run` 을 실행하면 Kubernetes API 서버에 REST HTTP 요청을 보낸다.
- Kubernetes API 서버는 요청을 받아 새로운 ReplicationController 오브젝트를 생성한다.
- ReplicationController 가 새로운 pod 를 생성하게 되고, 이는 Scheduler 에 의해 어떤 worker 노드에 할당된다.
- Kubelet 이 동작하여 Docker 를 실행하게 하고 Docker 가 컨테이너를 실행한다.
- Kubelet 이 동작하여 Docker 를 실행하게 하고 Docker 가 컨테이너를 실행한다.
### 2.3.2 애플리케이션에 접근하기
@@ -311,4 +315,4 @@ $ kubectl cluster-info | grep dashboard
```
- 대시보드가 실행 중인 주소를 알려줄 것이다.
- Minikube 의 경우 `minikube dashboard`.
- Minikube 의 경우 `minikube dashboard`.