[英]Kubectl command to list pods of a deployment in Kubernetes
Is there a way to use kubectl
to list only the pods belonging to a deployment?有没有办法使用
kubectl
仅列出属于部署的 pod? Currently, I do this to get pods:目前,我这样做是为了获取 pod:
kubectl get pods| grep hello
But it seems an overkill to get ALL the pods when I am interested to know only the pods for a given deployment.但是,当我有兴趣只知道给定部署的 pod 时,获取所有 pod 似乎有点过头了。 I use the output of this command to see the status of all pods, and then possibly exec into one of them.
我使用此命令的 output 来查看所有 Pod 的状态,然后可能执行到其中一个。
I also tried kc get -o wide deployments hellodeployment
, but it does not print the Pod names.我还尝试
kc get -o wide deployments hellodeployment
,但它不打印 Pod 名称。
There's a label in the pod for the selector in the deployment.部署中的选择器在 pod 中有一个标签。 That's how a deployment manages its pods.
这就是部署管理其 pod 的方式。 For example for the label or selector
app=http-svc
you can do something like that this and avoid using grep
and listing all the pods (this becomes useful as your number of pods becomes very large):例如,对于标签或选择器
app=http-svc
您可以执行类似的操作并避免使用grep
并列出所有 pod(当您的 pod 数量变得非常大时,这会变得很有用):
$ kubectl get pods -l=app=http-svc
or或者
$ kubectl get pods --selector=app=http-svc
K8s components are linked to each other by labels and selectors. K8s 组件通过标签和选择器相互链接。 There are just no built-in attributes of My-List-of-ReplicaSets or My-List-Of-Pods for a deployment.
部署没有 My-List-of-ReplicaSets 或 My-List-Of-Pods 的内置属性。 You can't get them from kubectl describe or kubectl get
您无法从kubectl describe或kubectl get获取它们
As @Rico suggested above, you have to use label filters.正如上面@Rico 建议的那样,您必须使用标签过滤器。 But you can't simply use the labels that you specify in the deployment metafile because deployment will generate a random hash and use it as an additional label.
但是您不能简单地使用您在部署元文件中指定的标签,因为部署将生成一个随机散列并将其用作附加标签。
For example, I have a deployment and a standalone pod that share the same label app=http-svc .例如,我有一个部署和一个独立的 pod,它们共享相同的标签app=http-svc 。 While the first two are managed by the deployment, the 3rd one is not and shouldn't be in the result.
虽然前两个由部署管理,但第三个不是也不应该出现在结果中。
ma.chi@~/k8s/deployments % kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
http-9c89b5578-6cqbp 1/1 Running 0 7s app=http-svc,pod-template-hash=574561134
http-9c89b5578-vwqbx 1/1 Running 0 7s app=http-svc,pod-template-hash=574561134
nginx-standalone 1/1 Running 0 7s app=http-svc
ma.chi@~/k8s/deployments %
The source file is源文件是
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: http-svc
name: http
spec:
replicas: 2
selector:
matchLabels:
app: http-svc
strategy: {}
template:
metadata:
labels:
app: http-svc
spec:
containers:
- image: nginx:1.9.1
name: nginx1
---
apiVersion: v1
kind: Pod
metadata:
labels:
app: http-svc
name: nginx-standalone
spec:
containers:
- image: nginx:1.9.1
name: nginx1-standalone
To exact spot the containers created and managed by your deployment, you can use the script below(which is ugly, but this is the best I can do)要准确定位由您的部署创建和管理的容器,您可以使用下面的脚本(这很丑陋,但这是我能做的最好的)
DEPLOY_NAME=http
RS_NAME=`kubectl describe deployment $DEPLOY_NAME|grep "^NewReplicaSet"|awk '{print $2}'`; echo $RS_NAME
POD_HASH_LABEL=`kubectl get rs $RS_NAME -o jsonpath="{.metadata.labels.pod-template-hash}"` ; echo $POD_HASH_LABEL
POD_NAMES=`kubectl get pods -l pod-template-hash=$POD_HASH_LABEL --show-labels | tail -n +2 | awk '{print $1}'`; echo $POD_NAMES
Here's a tidier shell alias (based on this code by @kekaoyunfuwu) that only lists the pods of a deployment (no interim results are shown):这是一个更简洁的 shell 别名(基于@kekaoyunfuwu 的此代码),它仅列出了部署的 pod(未显示中间结果):
k_list_pods_in_deployment() {
test $# -eq 0 && {
echo "Missing deployment name" && kubectl get deployments
return 1
}
local deployment="$1"; shift
local replicaSet="$(kubectl describe deployment $deployment \
| grep '^NewReplicaSet' \
| awk '{print $2}'
)"
local podHashLabel="$(kubectl get rs $replicaSet \
-o jsonpath='{.metadata.labels.pod-template-hash}'
)"
kubectl get pods -l pod-template-hash=$podHashLabel --show-labels \
| tail -n +2 | awk '{print $1}'
}
alias k.list-pods-in-deployment=k_list_pods_in_deployment
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