kubectl custom column 사용

<조회대상 샘플 yaml>

<deploy yaml> apiVersion: apps/v1 kind: Deployment metadata:   name: nginx-deployment   labels:     app: test-nginx     tier: frontend spec:   replicas: 3   strategy:     type: Recreate   selector:     matchLabels:       app: test-nginx

 

 

<custom column 활용>

 . 조회방법 :   

1) -o custom-columns=컬럼명:경로

2) kubectl custom-columns조회시   mapping이 1번은  . 한개,   N번이라면 N번의 .을 추가하면 됨

 

 

 . ex)

1.Spec  조회 (map .한번) 

controlplane $ kubectl get deploy nginx-deployment -o custom-columns=spec:.spec

<결과>

spec

map[progressDeadlineSeconds:600 replicas:3 revisionHistoryLimit:10 selector:map[matchLabels:map[app:test-nginx]]  <..중략>

 

 

2. replicas 조회 (map . 한번)

controlplane $ kubectl get deploy nginx-deployment -o custom-columns=replicas:.spec.replicas    #map에  .  한번

<결과>

replicas

3

 

3. matchLabels의 app 조회 (map .. 두번)

< selector는 . 1번>

controlplane $ kubectl get deploy nginx-deployment -o custom-columns=matchlabels:.spec.selector

 

matchlabels

map[matchLabels:map[app:test-nginx]]

< app는  map이 2번, 그래서 . 2번 후 key(app)값 >

 

controlplane $ kubectl get deploy nginx-deployment -o custom-columns=matchlabels:.spec.selector..app

<결과>

matchlabels

test-nginx