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查詢kubectl的資源

使用kubectl get可以針對k8s上的資源進行查詢的動作，而目前(k8s 1.3)的版本可以支援的查詢如下：

  • pods (po)
  • services (svc)
  • deployments
  • replicasets (rs)
  • replicationcontrollers (rc)
  • nodes (no)
  • events (ev)
  • limitranges (limits)
  • persistentvolumes (pv)
  • persistentvolumeclaims (pvc)
  • resourcequotas (quota)
  • namespaces (ns)
  • serviceaccounts (sa)
  • ingresses (ing)
  • horizontalpodautoscalers (hpa)
  • daemonsets (ds)
  • configmaps
  • componentstatuses (cs)
  • endpoints (ep)
  • secrets

這些資源有不少有簡寫(括弧裡面的)可以使用，常打的不妨記一下... :D

如果嫌太多，不好記，可以直接按enter來查詢來查詢help page...

kubectl get

常用的查詢指令

kubectl get一次取多個type

kubectl get支援透過","隔開來一次取多個不同的type的值...

# kubectl get pods,svc,deploy
NAME                              READY     STATUS    RESTARTS   AGE
po/iot-couchdb-2476679917-hqv22   1/1       Running   0          58m
po/iot-redis-2940781838-p5qqq     1/1       Running   0          57m
po/iot-server-2844449461-7ljj4    1/1       Running   0          11m
po/iot-server-2844449461-srj10    1/1       Running   0          10m
po/iot-server-2844449461-z6ndg    1/1       Running   0          10m
po/service-loadbalancer-jzmgb     1/1       Running   1          19h

NAME              CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
svc/iot-couchdb   10.110.72.39   <none>        5984/TCP   58m
svc/iot-redis     10.98.159.71   <none>        6379/TCP   57m
svc/iot-server    10.101.151.5   10.244.3.18   3000/TCP   11m
svc/kubernetes    10.96.0.1      <none>        443/TCP    1d

NAME                 DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/iot-couchdb   1         1         1            1           58m
deploy/iot-redis     1         1         1            1           57m
deploy/iot-server    3         3         3            3           11m

透過wide來延展欄位

kubectl get可以透過"-o wide"來擴充顯示的欄位，會多出

# kubectl get pods,svc,deploy -o wide
NAME                              READY     STATUS    RESTARTS   AGE       IP            NODE
po/iot-couchdb-2476679917-hqv22   1/1       Running   0          58m       10.244.3.20   k8s-n3
po/iot-redis-2940781838-p5qqq     1/1       Running   0          57m       10.244.2.27   k8s-n2
po/iot-server-2844449461-7ljj4    1/1       Running   0          11m       10.244.3.23   k8s-n3
po/iot-server-2844449461-srj10    1/1       Running   0          10m       10.244.1.31   k8s-n1
po/iot-server-2844449461-z6ndg    1/1       Running   0          10m       10.244.2.30   k8s-n2
po/service-loadbalancer-jzmgb     1/1       Running   1          19h       10.244.3.18   k8s-n3

NAME              CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE       SELECTOR
svc/iot-couchdb   10.110.72.39   <none>        5984/TCP   58m       app=couchdb,tier=iot-couchdb
svc/iot-redis     10.98.159.71   <none>        6379/TCP   57m       app=redis,tier=iot-redis
svc/iot-server    10.101.151.5   10.244.3.18   3000/TCP   11m       app=iot-server,tier=iot-server
svc/kubernetes    10.96.0.1      <none>        443/TCP    1d        <none>

NAME                 DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/iot-couchdb   1         1         1            1           58m
deploy/iot-redis     1         1         1            1           57m
deploy/iot-server    3         3         3            3           11m

透過show-label檢視node上的label

k8s在node上可以附加一些label資訊，透過這些資訊可以讓selector在部屬的時候來做選用不同的node進行服務部署，想檢視node上的label，可以透過--show-labels來看：

# kubectl get node --show-labels
NAME         STATUS         AGE       LABELS
k8s-master   Ready,master   14m       beta.kubernetes.io/arch=arm,beta.kubernetes.io/os=linux,kubeadm.alpha.kubernetes.io/role=master,kubernetes.io/hostname=k8s-master
root@k8s-master:~#