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chore: reorganize all image files and linted documents (#80)
* [PUBLISHER] upload files #62 * [PUBLISHER] upload files #63 * [PUBLISHER] upload files #64 * [PUBLISHER] upload files #65 * [PUBLISHER] upload files #66 * [PUBLISHER] upload files #67 * PUSH NOTE : test-document.md * PUSH NOTE : 09. Lp Functions.md * PUSH ATTACHMENT : mt-09.png * PUSH NOTE : 03. Measure Spaces.md * PUSH ATTACHMENT : mt-03.png * PUSH NOTE : 08. Comparison with the Riemann Integral.md * PUSH ATTACHMENT : mt-08.png * PUSH NOTE : 07. Dominated Convergence Theorem.md * PUSH ATTACHMENT : mt-07.png * PUSH NOTE : 06. Convergence Theorems.md * PUSH ATTACHMENT : mt-06.png * PUSH NOTE : 05. Lebesgue Integration.md * PUSH ATTACHMENT : mt-05.png * PUSH NOTE : test-document.md * [PUBLISHER] upload files #68 * [PUBLISHER] upload files #69 * PUSH NOTE : 08. Comparison with the Riemann Integral.md * PUSH ATTACHMENT : mt-08.png * PUSH NOTE : 02. Construction of Measure.md * PUSH ATTACHMENT : mt-02.png * DELETE FILE : _posts/2023-09-09-test-document.md * DELETE FILE : _posts/Mathematics/Measure Theory/2023-09-09-test-document.md * [PUBLISHER] upload files #70 * PUSH NOTE : Rules of Inference with Coq.md * PUSH NOTE : 수학 공부에 대한 고찰.md * PUSH NOTE : 04. Measurable Functions.md * PUSH ATTACHMENT : mt-04.png * PUSH NOTE : 07. Dominated Convergence Theorem.md * PUSH ATTACHMENT : mt-07.png * PUSH NOTE : 08. Comparison with the Riemann Integral.md * PUSH ATTACHMENT : mt-08.png * PUSH NOTE : 05. Lebesgue Integration.md * PUSH ATTACHMENT : mt-05.png * PUSH NOTE : 03. Measure Spaces.md * PUSH ATTACHMENT : mt-03.png * PUSH NOTE : 09. Lp Functions.md * PUSH ATTACHMENT : mt-09.png * PUSH NOTE : 06. Convergence Theorems.md * PUSH ATTACHMENT : mt-06.png * PUSH NOTE : 02. Construction of Measure.md * PUSH ATTACHMENT : mt-02.png * PUSH NOTE : 01. Algebra of Sets and Set Functions.md * PUSH ATTACHMENT : mt-01.png * PUSH NOTE : 블로그 이주 이야기.md * PUSH ATTACHMENT : blog-logo.png * PUSH ATTACHMENT : github-publisher.png * PUSH NOTE : 05. Services - Enabling Clients to Discover and Talk to Pods.md * PUSH ATTACHMENT : k8s-05.jpeg * PUSH NOTE : 18. Extending Kubernetes.md * PUSH ATTACHMENT : k8s-18.jpeg * PUSH NOTE : 11. Understanding Kubernetes Internals.md * PUSH ATTACHMENT : k8s-11.jpeg * PUSH NOTE : 04. Replication and Other Controllers - Deploying Managed Pods.md * PUSH ATTACHMENT : k8s-04.jpeg * PUSH NOTE : 10. StatefulSets - Deploying Replicated Stateful Applications.md * PUSH ATTACHMENT : k8s-10.jpeg * PUSH NOTE : 02. First Steps with Docker and Kubernetes.md * PUSH ATTACHMENT : k8s-02.jpeg * PUSH NOTE : 06. Volumes - Attaching Disk Storage to Containers.md * PUSH ATTACHMENT : k8s-06.jpeg * PUSH NOTE : 12. Securing the Kubernetes API Server.md * PUSH ATTACHMENT : k8s-12.jpeg * PUSH NOTE : 07. ConfigMaps and Secrets - Configuring Applications.md * PUSH ATTACHMENT : k8s-07.jpeg * PUSH NOTE : 13. Securing Cluster Nodes and the Network.md * PUSH ATTACHMENT : k8s-13.jpeg * PUSH NOTE : 09. Deployments - Updating Applications Declaratively.md * PUSH ATTACHMENT : k8s-09.jpeg * PUSH NOTE : 17. Best Practices for Developing Apps.md * PUSH ATTACHMENT : k8s-17.jpeg * PUSH NOTE : 16. Advanced Scheduling.md * PUSH ATTACHMENT : k8s-16.jpeg * PUSH NOTE : 08. Accessing Pod Metadata and Other Resources from Applications.md * PUSH ATTACHMENT : k8s-08.jpeg * PUSH NOTE : 15. Automatic Scaling of Pods and Cluster Nodes.md * PUSH ATTACHMENT : k8s-15.jpeg * PUSH NOTE : 01. Introducing Kubernetes.md * PUSH ATTACHMENT : k8s-01.jpeg * PUSH NOTE : 03. Pods - Running Containers in Kubernetes.md * PUSH ATTACHMENT : k8s-03.jpeg * PUSH NOTE : 14. Managing Pods' Computational Resources.md * PUSH ATTACHMENT : k8s-14.jpeg * [PUBLISHER] upload files #71 * PUSH NOTE : test-document.md * PUSH NOTE : test-document.md * PUSH ATTACHMENT : test-image.png * DELETE FILE : assets/img/posts/test/test-image.png * [PUBLISHER] upload files #72 * PUSH NOTE : test-document.md * PUSH ATTACHMENT : test-image.png * DELETE FILE : assets/img/posts/test/test-image.png * [PUBLISHER] upload files #73 * PUSH NOTE : test-document.md * PUSH ATTACHMENT : test-image.png * chore: remove test files * [PUBLISHER] upload files #74 * PUSH NOTE : 01. Algebra of Sets and Set Functions.md * PUSH ATTACHMENT : mt-01.png * DELETE FILE : assets/img/posts/Mathematics/Measure Theory/mt-01.png * [PUBLISHER] upload files #76 * PUSH NOTE : 01. Algebra of Sets and Set Functions.md * PUSH ATTACHMENT : mt-01.png * [PUBLISHER] upload files #77 * PUSH NOTE : 09. Lp Functions.md * PUSH ATTACHMENT : mt-09.png * PUSH NOTE : 08. Comparison with the Riemann Integral.md * PUSH ATTACHMENT : mt-08.png * PUSH NOTE : 07. Dominated Convergence Theorem.md * PUSH ATTACHMENT : mt-07.png * PUSH NOTE : 06. Convergence Theorems.md * PUSH ATTACHMENT : mt-06.png * PUSH NOTE : 05. Lebesgue Integration.md * PUSH ATTACHMENT : mt-05.png * PUSH NOTE : 04. Measurable Functions.md * PUSH ATTACHMENT : mt-04.png * PUSH NOTE : 03. Measure Spaces.md * PUSH ATTACHMENT : mt-03.png * PUSH NOTE : 01. Algebra of Sets and Set Functions.md * PUSH ATTACHMENT : mt-01.png * chore: remove images * [PUBLISHER] upload files #78 * PUSH NOTE : 09. Lp Functions.md * PUSH ATTACHMENT : mt-09.png * PUSH NOTE : 08. Comparison with the Riemann Integral.md * PUSH ATTACHMENT : mt-08.png * PUSH NOTE : 07. Dominated Convergence Theorem.md * PUSH ATTACHMENT : mt-07.png * PUSH NOTE : 06. Convergence Theorems.md * PUSH ATTACHMENT : mt-06.png * PUSH NOTE : 05. Lebesgue Integration.md * PUSH ATTACHMENT : mt-05.png * PUSH NOTE : 04. Measurable Functions.md * PUSH ATTACHMENT : mt-04.png * PUSH NOTE : 03. Measure Spaces.md * PUSH ATTACHMENT : mt-03.png * PUSH NOTE : 01. Algebra of Sets and Set Functions.md * PUSH ATTACHMENT : mt-01.png * PUSH NOTE : 18. Extending Kubernetes.md * PUSH ATTACHMENT : k8s-18.jpeg * PUSH NOTE : 17. Best Practices for Developing Apps.md * PUSH ATTACHMENT : k8s-17.jpeg * PUSH NOTE : 16. Advanced Scheduling.md * PUSH ATTACHMENT : k8s-16.jpeg * PUSH NOTE : 15. Automatic Scaling of Pods and Cluster Nodes.md * PUSH ATTACHMENT : k8s-15.jpeg * PUSH NOTE : 14. Managing Pods' Computational Resources.md * PUSH ATTACHMENT : k8s-14.jpeg * PUSH NOTE : 13. Securing Cluster Nodes and the Network.md * PUSH ATTACHMENT : k8s-13.jpeg * PUSH NOTE : 12. Securing the Kubernetes API Server.md * PUSH ATTACHMENT : k8s-12.jpeg * PUSH NOTE : 11. Understanding Kubernetes Internals.md * PUSH ATTACHMENT : k8s-11.jpeg * PUSH NOTE : 10. StatefulSets - Deploying Replicated Stateful Applications.md * PUSH ATTACHMENT : k8s-10.jpeg * PUSH NOTE : 09. Deployments - Updating Applications Declaratively.md * PUSH ATTACHMENT : k8s-09.jpeg * PUSH NOTE : 08. Accessing Pod Metadata and Other Resources from Applications.md * PUSH ATTACHMENT : k8s-08.jpeg * PUSH NOTE : 07. ConfigMaps and Secrets - Configuring Applications.md * PUSH ATTACHMENT : k8s-07.jpeg * PUSH NOTE : 06. Volumes - Attaching Disk Storage to Containers.md * PUSH ATTACHMENT : k8s-06.jpeg * PUSH NOTE : 05. Services - Enabling Clients to Discover and Talk to Pods.md * PUSH ATTACHMENT : k8s-05.jpeg * PUSH NOTE : 04. Replication and Other Controllers - Deploying Managed Pods.md * PUSH ATTACHMENT : k8s-04.jpeg * PUSH NOTE : 03. Pods - Running Containers in Kubernetes.md * PUSH ATTACHMENT : k8s-03.jpeg * PUSH NOTE : 02. First Steps with Docker and Kubernetes.md * PUSH ATTACHMENT : k8s-02.jpeg * PUSH NOTE : 01. Introducing Kubernetes.md * PUSH ATTACHMENT : k8s-01.jpeg * [PUBLISHER] upload files #79 * PUSH NOTE : 02. Construction of Measure.md * PUSH ATTACHMENT : mt-02.png
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@@ -7,10 +7,12 @@ title: "08. Accessing Pod Metadata and Other Resources from Applications"
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date: "2021-04-18"
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github_title: "2021-04-18-08-accessing-pod-metadata"
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image:
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path: /assets/img/posts/k8s-08.jpeg
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path: /assets/img/posts/Development/Kubernetes/k8s-08.jpeg
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attachment:
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folder: assets/img/posts/Development/Kubernetes
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---
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 _Using the files from the default-token Secret to talk to the API server (출처: https://livebook.manning.com/book/kubernetes-in-action/chapter-8)_
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 _Using the files from the default-token Secret to talk to the API server (출처: https://livebook.manning.com/book/kubernetes-in-action/chapter-8)_
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### 주요 내용
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@@ -18,6 +20,7 @@ image:
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- 컨테이너 안의 앱이 Kubernetes API 와 통신하고 클러스터의 리소스를 생성/수정하는 방법
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## 8.1 Passing metadata through the Downward API
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---
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앱의 config data 는 pod 생성 전에 결정되기 때문에 환경 변수나 configMap, secret volume 을 이용해 전달할 수 있었다.
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@@ -173,7 +176,7 @@ total 24
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-rw-r--r-- 1 root root 7 Apr 17 06:31 podNamespace
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```
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> `-L` (`--dereference`) 옵션: when showing file information for a symbolic link, show information for the file the link references rather than for the link itself
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> `-L` (`--dereference`) 옵션: when showing file information for a symbolic link, show information for the file the link references rather than for the link itself
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#### label 과 annotation 은 volume 으로만 expose 가능한 이유
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@@ -192,9 +195,10 @@ total 24
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Downward API 를 사용하는 것은 간단하다. Shell script 로 환경 변수를 설정하는 등의 수고로움을 덜어줄 것며, 애플리케이션이 Kubernetes 에 의존하지 않게 할 수 있다. 만약 환경 변수 값을 이용해서 동작하는 앱이라면 Downward API 가 유용할 것이다.
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## 8.2 Talking to the Kubernetes API server
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---
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Downward API 도 다양한 정보를 제공하지만 이로는 부족할 수 있다. (다른 pod/클러스터의 정보가 필요하거나) 그렇다면 Kubernetes API server 와 직접 통신하여 원하는 값을 얻어야 한다.
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Downward API 도 다양한 정보를 제공하지만 이로는 부족할 수 있다. (다른 pod/클러스터의 정보가 필요하거나) 그렇다면 Kubernetes API server 와 직접 통신하여 원하는 값을 얻어야 한다.
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### 8.2.1 Exploring the Kubernetes REST API
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@@ -349,7 +353,7 @@ KUBERNETES_SERVICE_PORT_HTTPS=443
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> SRV record: specification of data in the DNS defining the location of servers for specified services. 여기서 location 이라 함은 hostname 과 port number 정도로 생각해도 괜찮을 것 같다.
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한 번 `https://kubernetes` 로 요청을 보내보면 인증서가 없어서 실패한다.
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한 번 `https://kubernetes` 로 요청을 보내보면 인증서가 없어서 실패한다.
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```
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root@curl:/# curl https://kubernetes
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@@ -430,11 +434,13 @@ $ curl -H "Authorization: Bearer $TOKEN" https://kubernetes
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```
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> Role-based access control ([RBAC](https://kubernetes.io/docs/reference/access-authn-authz/rbac/)) 이 실행되고 있는 클러스터에서는 위 `curl` 에서 에러가 난다. 일단 테스트를 위해서 임시적으로
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>
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> ```bash
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> kubectl create clusterrolebinding permissive-binding \
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> --clusterrole=cluster-admin \
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> --group=system:serviceaccounts
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> ```
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>
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> 를 입력하여 모든 serviceaccounts 에 admin 권한을 줄 수 있다 ㅋㅋㅋ;
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#### 현재 pod 의 namespace 가져오기
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