Kubernetes 的 Label 和 Annotation 小記
Label
實作
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kubectl run alpaca-prod \
--image=gcr.io/kuar-demo/kuard-amd64:blue \
--replicas=2 \ # 這個已經廢棄
--labels="ver=1,app=alpaca,env=prod"
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kubectl run alpaca-test \
--image=gcr.io/kuar-demo/kuard-amd64:green \
--replicas=1 \ # 這個已經廢棄
--labels="ver=2,app=alpaca,env=test"
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kubectl run bandicoot-prod \
--image=gcr.io/kuar-demo/kuard-amd64:green \
--replicas=2 \ # 這個已經廢棄
--labels="ver=2,app=bandicoot,env=prod"
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kubectl run bandicoot-staging \
--image=gcr.io/kuar-demo/kuard-amd64:green \
--replicas=1 \
--labels="ver=2,app=bandicoot,env=prod"
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Flag --replicas has been deprecated, has no effect and will be removed in the future.
在K8S v1.18.0 以後，–replicas已棄用 ,推薦用 deployment 創建 pods
解决k8s 1.18.0版本 replicas 被弃用问题 - 菜鸟bai - 博客园
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kubectl get pods --show-labels
# NAME READY STATUS RESTARTS AGE LABELS
# alaca-prod 1/1 Running 0 2m46s app=alpaca,env=prod,ver=1
# alpaca-test 1/1 Running 0 2m11s app=alpaca,env=test,ver=2
# bandicoot-prod 1/1 Running 0 2m4s app=bandicoot,env=prod,ver=2
# bandicoot-staging 1/1 Running 0 117s app=bandicoot,env=prod,ver=2
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Remove all the generators from kubectl run. It will now only create pods.
minikube - How to start a pod in command line without deployment in kubernetes? - Stack Overflow
這邊我書上都寫 deployments 想說怎麼跟我電腦跑的結果不一樣
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kubectl label pods alpaca-test "canary=true" ✔ 22 22:27:42
# pod/alpaca-test labeled
kubectl get pods alpaca-test -L canary ✔ 23 22:28:03
# NAME READY STATUS RESTARTS AGE CANARY
# alpaca-test 1/1 Running 0 12m true
kubectl label podsalpaca-test "canary-"
# pod/alpaca-test labeled
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Label 選擇器
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kubectl get pods --show-labels
# NAME READY STATUS RESTARTS AGE LABELS
# alaca-prod 1/1 Running 0 16m app=alpaca,env=prod,ver=1
# alpaca-test 1/1 Running 0 15m app=alpaca,env=test,ver=2
# bandicoot-prod 1/1 Running 0 15m app=bandicoot,env=prod,ver=2
# bandicoot-staging 1/1 Running 0 15m app=bandicoot,env=prod,ver=2
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kubectl get pods --selector="ver=2"
# NAME READY STATUS RESTARTS AGE
# alpaca-test 1/1 Running 0 22m
# bandicoot-prod 1/1 Running 0 22m
# bandicoot-staging 1/1 Running 0 22m
kubectl get pods --selector="app=bandicoot,ver=2"
# NAME READY STATUS RESTARTS AGE
# bandicoot-prod 1/1 Running 0 23m
# bandicoot-staging 1/1 Running 0 23m
kubectl get pods --selector="app in (alpaca,bandicoot)"
# NAME READY STATUS RESTARTS AGE
# alpaca-prod 1/1 Running 0 4m35s
# alpaca-test 1/1 Running 0 26m
# bandicoot-prod 1/1 Running 0 26m
# bandicoot-staging 1/1 Running 0 26m
kubectl get pods --selector="canary"
# No resources found in default namespace.
kubectl get pods --selector='!canary'
# NAME READY STATUS RESTARTS AGE
# alpaca-prod 1/1 Running 0 7m19s
# alpaca-test 1/1 Running 0 29m
# bandicoot-prod 1/1 Running 0 29m
# bandicoot-staging 1/1 Running 0 29m
kubectl get pods -l 'ver=2,!canary'
# NAME READY STATUS RESTARTS AGE
# alpaca-test 1/1 Running 0 30m
# bandicoot-prod 1/1 Running 0 30m
# bandicoot-staging 1/1 Running 0 30m
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Yaml 寫 IN 方法
kubectl get pods -l ’environment in (production, qa)'
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selector:
matchLabels:
component: redis
matchExpressions:
- {key: tier, operator: In, values: [cache]}
- {key: environment, operator: NotIn, values: [dev]}
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可參考:Labels and Selectors | Kubernetes
舊版寫法(因為相容還是可以跑)
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selector:
app: alpaca
ver: 1
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Annotation
我看書沒特別介紹
感覺他就是Java HashMap 可以任意存任何key value 值
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...
metadata:
anotations:
xxxx.com/url: "http://xxxx"
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移除範例 pods
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kubectl delete pods --all
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delete 也可以搭配篩選器selector