3.2.6. kubectl get¶
用法:
kubectl get
[(-o|--output=)json|yaml|wide|custom-columns=...|custom-columns-file=...
|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=...]
(TYPE[.VERSION][.GROUP] [NAME | -l label] | TYPE[.VERSION][.GROUP]/NAME ...) [flags] [options]
实例:
$> kubectl get pods # 可简写为 kubectl get po
$> kubectl get replicationcontroller # 可简写为 kubectl get rc
$> kubectl get services # 可简写为 kubectl get svc
$> kubectl get nodes
$> kubectl get cronjob
$> kubectl get jobs
$> kubectl get event --watch
// 获取全部类型的资源
$> kubectl get all
定时相关:
// 查看crontab情况
$ kubectl get cronjob
$ kubectl get cronjob <cronName>
// 查看 Job 的执行情况
$> kubectl get jobs
$> kubectl get jobs <jobName>
// cron第一次执行job
$ kubectl get cronjob
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
goanalysis 35 6 * * * False 0 <none> 2m29s
// cron在3分钟多前执行过一次
$ kubectl get cronjob
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
goanalysis 35 6 * * * False 0 3m5s 6m57s
pod:
# 列出pods时显示更多信息（如node名,ip等）
$> kubectl get pods -o wide
# 展示出停止状态的信息
$> kubectl get jobs --show-all -o wide
// --show-labels
# 显示label
$> kubectl get pods --show-labels
// -L, --label-columns=[]
# 显示指定label
$> kubectl get pods -L labelkey1,labelkey2
// -l, --selector=''
# 过滤指定k/v
$> kubectl get po -l labelkey1=labelvalue1
$> kubectl get po -l labelkey1!=labelvalue1
$> kubectl get po -l labelkey1 in (value1, value2)
$> kubectl get po -l labelkey1 notin (value1, value2)
# 有key1标签的
$> kubectl get po -l key1
# 没有key1标签的
$> kubectl get po -l '!key1'
// -o, --output=''
# 查看指定pod详情
$> kubectl get pods <podName> -o yaml
services:
# 查看指定services
$> kubectl get svc <serviceName> -o yaml
# 查询入口网关服务的 IP 地址
kubectl get service serviceName -n default -o jsonpath="{.status.loadBalancer.ingress[*].ip}"
node:
kubectl get nodes -l labelkey1=labelvalue1
# 查看node详情
$> kubectl get node <nodeName> -o yaml
replicationcontroller:
# 列出单个rc
$ kubectl get replicationcontroller web
namespace:
# 列出所有ns
kubectl get ns
# 列出指定ns的pods列表
kubectl get po --namespace <nsName>
or
kubectl get po -n <nsName>
查看configmap:
$> kubectl get configmap --all-namespaces
$> kubectl get configmap <configName> -o yaml
监听:
-w, --watch=false
# 查看Pod删除和重新创建的过程
$ kubectl get pod -w -l app=nginx
# 查看事件(详见下表)
$> kubectl get event --watch
表:创建pod过程
NAME
KIND
SUBOBJECT
TYPE
REASON
SOURCE
MESSAGE
podname.15f33648d8e97c9e
Pod
Normal
Scheduled
default-scheduler
empty
Successfully assigned default/podname to cn-beijing.172.17.5.201
podname.15f336490a33b960
Pod
spec.containers{main}
Normal
Pulling
kubelet, cn-beijing.172.17.5.201
pulling image “tutum/curl”
podname.15f3365333f4c0ac
Pod
spec.containers{main}
Normal
Pulled
kubelet, cn-beijing.172.17.5.201
Successfully pulled image “tutum/curl”
podname.15f33653360a1912
Pod
spec.containers{main}
Normal
Created
kubelet, cn-beijing.172.17.5.201
Created container
podname.15f336534846ab6a
Pod
spec.containers{main}
Normal
Started
kubelet, cn-beijing.172.17.5.201
Started container
podname.15f336534853dc05
Pod
spec.containers{ambassador}
Normal
Pulling
kubelet, cn-beijing.172.17.5.201
pulling image “luksa/kubectl-proxy:1.6.2”
podname.15f33655386fb6bc
Pod
spec.containers{ambassador}
Normal
Pulled
kubelet, cn-beijing.172.17.5.201
Successfully pulled image “luksa/kubectl-proxy:1.6.2”
podname.15f336553a336296
Pod
spec.containers{ambassador}
Normal
Created
kubelet, cn-beijing.172.17.5.201
Created container
podname.15f336554fa3b009
Pod
spec.containers{ambassador}
Normal
Started
kubelet, cn-beijing.172.17.5.201
Started container
podname.15f33668368bddae
Pod
spec.containers{ambassador}
Normal
Killing
kubelet, cn-beijing.172.17.5.201
Killing container with id docker://ambassador:Need to kill Pod
podname.15f336683a3b25f0
Pod
spec.containers{main}
Normal
Killing
kubelet, cn-beijing.172.17.5.201
Killing container with id docker://main:Need to kill Pod
其他:
# List deployments in JSON output format, in the "v1" version of the "apps" API group:
$ kubectl get deployments.v1.apps -o json
# List a single pod in JSON output format.
$ kubectl get -o json pod web-pod-13je7
# List a pod identified by type and name specified in "pod.yaml" in JSON output format.
$ kubectl get -f pod.yaml -o json
# Return only the phase value of the specified pod.
$ kubectl get -o template pod/web-pod-13je7 --template={{.status.phase}}
# List all replication controllers and services together in ps output format.
$ kubectl get rc,services
# List one or more resources by their type and names.
$ kubectl get rc/web service/frontend pods/web-pod-13je7
// 查看各组件信息
$ kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health":"true"}
以其他格式打印
$ k get po -o yaml
$ k get po -o json
$ k get po <POD> -o jsonpath="Name: {.metadata.name} Status: {.status.phase}"
允许的格式有:
custom-columns,custom-columns-file,go-template,go-template-file,
json,jsonpath,jsonpath-file,name,template,templatefile,wide,yaml
JSONPath Support [1]¶
实例1¶
json格式(如: k get po -o json):
{
"kind": "List",
"items":[
{
"kind":"None",
"metadata":{"name":"127.0.0.1"},
"status":{
"capacity":{"cpu":"4"},
"addresses":[{"type": "LegacyHostIP", "address":"127.0.0.1"}]
}
},
{
"kind":"None",
"metadata":{"name":"127.0.0.2"},
"status":{
"capacity":{"cpu":"8"},
"addresses":[
{"type": "LegacyHostIP", "address":"127.0.0.2"},
{"type": "another", "address":"127.0.0.3"}
]
}
}
],
"users":[
{
"name": "myself",
"user": {}
},
{
"name": "e2e",
"user": {"username": "admin", "password": "secret"}
}
]
}
函数说明:
text: kind is {.kind}
@: {@} (the current object )
. or []: {.kind} or {[‘kind’]}
..: {..name}
*: {.items[*].metadata.name}
[start:end :step]: {.users[0].name}
[,]: {.items[*][‘metadata.name’, ‘status.capacity’]}
?(): {.users[?(@.name==“e2e”)].user.password}
range, end: {range .items[*]}[{.metadata.name}, {.status.capacity}] {end}
“: {range .items[*]}{.metadata.name}{’\t’}{end}
实例:
kubectl get pods -o json
kubectl get pods -o=jsonpath='{@}'
kubectl get pods -o=jsonpath='{.items[0]}'
kubectl get pods -o=jsonpath='{.items[0].metadata.name}'
kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.startTime}{"\n"}{end}'
On Windows:
C:\> kubectl get pods -o=jsonpath="{range .items[*]}{.metadata.name}{'\t'}{.status.startTime}{'\n'}{end}"
C:\> kubectl get pods -o=jsonpath="{range .items[*]}{.metadata.name}{\"\t\"}{.status.startTime}{\"\n\"}{end}"
实例2¶
input:
$ kubectl get svc first-deployment -o yaml
apiVersion: v1
kind: Service
metadata:
creationTimestamp: "2020-04-22T06:44:41Z"
labels:
app: first-deployment
name: first-deployment
namespace: default
resourceVersion: "529"
selfLink: /api/v1/namespaces/default/services/first-deployment
uid: a25ff4b7-0ee9-4fdc-b134-6c66f9431bc1
spec:
clusterIP: 10.110.122.106
externalTrafficPolicy: Cluster
ports:
- nodePort: 31012
port: 80
protocol: TCP
targetPort: 80
selector:
app: first-deployment
sessionAffinity: None
type: NodePort
status:
loadBalancer: {}
使用:
$ export PORT=$(kubectl get svc first-deployment \
-o go-template='{{range.spec.ports}}{{if .nodePort}}{{.nodePort}}{{"\n"}}{{end}}{{end}}')
实例3¶
Get ExternalIPs of all nodes:
kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'
List Names of Pods that belong to Particular RC:
sel=${$(kubectl get rc my-rc --output=json | jq -j '.spec.selector | to_entries | .[] | "\(.key)=\(.value),"')%?}
echo $(kubectl get pods --selector=$sel --output=jsonpath={.items..metadata.name})
Check which nodes are ready:
JSONPATH='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}' \
&& kubectl get nodes -o jsonpath="$JSONPATH" | grep "Ready=True"
List all Secrets currently in use by a pod:
kubectl get pods -o json | jq '.items[].spec.containers[].env[]?.valueFrom.secretKeyRef.name' | grep -v null | sort | uniq
List all containerIDs of initContainer of all pods:
# Helpful when cleaning up stopped containers, while avoiding removal of initContainers.
kubectl get pods --all-namespaces -o jsonpath='{range .items[*].status.initContainerStatuses[*]}{.containerID}{"\n"}{end}' | cut -d/ -f3