ConfigMap.md

ConfigMap (CM)

ConfigMap

• 워크로드에 필요한 설정 정보를 Key-Value 형태로 저장할 수 있는 데이터 오브젝트
• 간단한 환경변수부터 nginx.conf와 같은 설정 파일도 저장 가능

YAML 구조

• ConfigMap

  apiVersion: v1
  kind: ConfigMap
  metadata:
  	name: test-config
  data:
  	APP_COLOR: blue
  	APP_MODE: prod

• ConfigMap 전체를 injection

  apiVersion: v1
  kind: Pod
  metadata:
  	name: myapp
  spec:
  	containers:
  		- name: myapp
  			image: nginx
  			ports:
  				- containerPort: 8080
  			envFrom:
  				- configMapRef:
  						name: test-config

• ConfigMap 일부를 injection

  apiVersion: v1
  kind: Pod
  metadata:
  	name: myapp
  spec:
  	containers:
  		- name: myapp
  			image: nginx
  			ports:
  				- containerPort: 8080
  			env:
  				- name: APP_COLOR
  					valueFrom:
  						configMapKeyRef:
  							name: test-config
  							key: APP_COLOR

• 파일을 담은 ConfigMap

  apiVersion: v1
  data:
    nginx.conf: |
      user       www www;  ## Default: nobody
      worker_processes  5;  ## Default: 1
      error_log  logs/error.log;
      pid        logs/nginx.pid;
      worker_rlimit_nofile 8192;
  
  		...
  kind: ConfigMap
  metadata:
    annotations:
      kubectl.kubernetes.io/last-applied-configuration: |
        {"kind":"ConfigMap","apiVersion":"v1","metadata":{"name":"test3-config","creationTimestamp":null},"data":{"nginx.conf":"user       www www;  ## Default: nobody\nworker_processes  5;  ## Default: 1\nerror_log  logs/error.log;\npid        logs/nginx.pid;\nworker_rlimit_nofile 8192;\n\nevents {\n  worker_connections  4096;  ## Default: 1024\n}\n\nhttp {\n  include    conf/mime.types;\n  include    /etc/nginx/proxy.conf;\n  include    /etc/nginx/fastcgi.conf;\n  index    index.html index.htm index.php;\n\n  default_type application/octet-stream;\n  log_format   main '$remote_addr - $remote_user [$time_local]  $status '\n    '\"$request\" $body_bytes_sent \"$http_referer\" '\n    '\"$http_user_agent\" \"$http_x_forwarded_for\"';\n  access_log   logs/access.log  main;\n  sendfile     on;\n  tcp_nopush   on;\n  server_names_hash_bucket_size 128; # this seems to be required for some vhosts\n\n  server { # php/fastcgi\n    listen       80;\n    server_name  domain1.com www.domain1.com;\n    access_log   logs/domain1.access.log  main;\n    root         html;\n\n    location ~ \\.php$ {\n      fastcgi_pass   127.0.0.1:1025;\n    }\n  }\n\n  server { # simple reverse-proxy\n    listen       80;\n    server_name  domain2.com www.domain2.com;\n    access_log   logs/domain2.access.log  main;\n\n    # serve static files\n    location ~ ^/(images|javascript|js|css|flash|media|static)/  {\n      root    /var/www/virtual/big.server.com/htdocs;\n      expires 30d;\n    }\n\n    # pass requests for dynamic content to rails/turbogears/zope, et al\n    location / {\n      proxy_pass      http://127.0.0.1:8080;\n    }\n  }\n\n  upstream big_server_com {\n    server 127.0.0.3:8000 weight=5;\n    server 127.0.0.3:8001 weight=5;\n    server 192.168.0.1:8000;\n    server 192.168.0.1:8001;\n  }\n\n  server { # simple load balancing\n    listen          80;\n    server_name     big.server.com;\n    access_log      logs/big.server.access.log main;\n\n    location / {\n      proxy_pass      http://big_server_com;\n    }\n  }\n}\n"}}
    creationTimestamp: "2023-07-02T03:03:44Z"
    name: test3-config
    namespace: default
    resourceVersion: "834953"
    uid: a61ae148-0cac-4aa0-b2f8-dd6e13f50977

  • ConfigMap 전체를 injection

    apiVersion: v1
    kind: Pod
    metadata:
    	name: myapp
    spec:
    	containers:
    		- name: myapp
    			image: nginx
    			volumeMounts:
    			- name: config-volume
    				mountPath: /config
    		volumes:
    		- name: config-volume
    			configMap:
    				name: test3-config

  • ConfigMap 일부를 injection

    apiVersion: v1
    kind: Pod
    metadata:
    	name: myapp
    spec:
    	containers:
    		- name: myapp
    			image: nginx
    			volumeMounts:
    			- name: config-volume
    				mountPath: /config
    		volumes:
    		- name: config-volume
    			configMap:
    				name: test3-config
    				items:
    				- key: nginx.conf
    					path: nginx-sample.conf