We have 3-4 different NetworkPolicy in our Namespace and they are applied based on Pod Selector. Want to know is there any way from Pod side to know which NetworkPolicy is applied on it?
If POD selector used you can use the simple way
kubectl get pod -l \
$( \
kubectl get netpolicies <netpolicy-name> \
-o jsonpath="{.spec.podSelector.matchLabels}"| \
jq -r 'to_entries|map("\(.key)=\(.value)")[]' \
)
This will get the policy selector and use it as input and list the pods
Any way from Pod side
There is no POD side you can check, however I read somewhere kubectl describe pod-name could show Network Policies I tested not showing at least in minikube
So you can use the above command or describe the networkpolicy itself to get POD selector and get an idea.
kubectl describe networkpolicies <name of policy>
The output of kubectl get network policy should display the pod-selector.
After that you can use kubectl get pod -l key=value to list the pods affected.
you can automate this using a bash script/function.
I would also recommend checking "kubectl np-viewer" which is a kubectl plugin, can be found here. This plugin has what you are asking for out of box.
kubectl np-viewer -p pod-name prints network policies rules affecting a specific pod in the current namespace
what is the command to remove all objects using kubectl for a specific environment?
kubectl -n squad-mb get all
returns all environments for example, and in order to delete one environment I would like to know how to see it, and which command would be required to delete the specific environment (i.e. develop)
To delete all resources of a given namespaces use:
kubectl delete all --all -n {my-namespace}
Explanation:
Usage: kubectl delete ([-f FILENAME] | TYPE [(NAME | -l label | --all)]) [options]
all: all resources types. If you want to delete only some resources you can do kubectl delete deployments,pods,replicasets,services --all
--all: delete all resources of a type (or all types if using all). Example: kubectl delete pods --all
-n: selects the desired namespace. If empty the command is valid for the default namespace of your context. You can select all namespaces with --all-namespaces
Just re-create the namespace:
kubectl delete ns squad-mb
kubectl create ns squad-mb
This will recursively delete everything inside.
kubectl -n namespace delete all pods -l env=dev
I am running the command
kubectl create -f mypod.yaml --namespace=mynamespace
as I need to specify the environment variables through a configMap I created and specified in the mypod.yaml file. Kubernetes returns
pod/mypod created
but kubectl get pods doesn't show it in my list of pods and I can't access it by name as if it does not exist. However, if I try to create it again, it says that the pod is already created.
What may cause this, and how would I diagnose the problem?
By default, kubectl commands operate in the default namespace. But you created your pod in the mynamespace namespace.
Try one of the following:
kubectl get pods -n mynamespace
kubectl get pods --all-namespaces
Is there a variant of kubectl delete all --all command or some other command to delete all resources except the kubernetes service?
I don't think there's a built-in command for it, which means you'll have to script your way out of it, something like this (add an if for the namespace you want to spare):
$ for ns in $(kubectl get ns --output=jsonpath={.items[*].metadata.name}); do kubectl delete ns/$ns; done;
Note: deleting a namespace deletes all its resources.
Upon looking at the docs, there is an API call to delete a single pod, but is there a way to delete all pods in all namespaces?
There is no command to do exactly what you asked.
Here are some close matches.
Be careful before running any of these commands. Make sure you are connected to the right cluster, if you use multiple clusters. Consider running. kubectl config view first.
You can delete all the pods in a single namespace with this command:
kubectl delete --all pods --namespace=foo
You can also delete all deployments in namespace which will delete all pods attached with the deployments corresponding to the namespace
kubectl delete --all deployments --namespace=foo
You can delete all namespaces and every object in every namespace (but not un-namespaced objects, like nodes and some events) with this command:
kubectl delete --all namespaces
However, the latter command is probably not something you want to do, since it will delete things in the kube-system namespace, which will make your cluster not usable.
This command will delete all the namespaces except kube-system, which might be useful:
for each in $(kubectl get ns -o jsonpath="{.items[*].metadata.name}" | grep -v kube-system);
do
kubectl delete ns $each
done
kubectl delete daemonsets,replicasets,services,deployments,pods,rc,ingress --all --all-namespaces
to get rid of them pesky replication controllers too.
You can simply run
kubectl delete all --all --all-namespaces
The first all means the common resource kinds (pods, replicasets, deployments, ...)
kubectl get all == kubectl get pods,rs,deployments, ...
The second --all means to select all resources of the selected kinds
Note that all does not include:
non namespaced resourced (e.g., clusterrolebindings, clusterroles, ...)
configmaps
rolebindings
roles
secrets
...
In order to clean up perfectly,
you could use other tools (e.g., Helm, Kustomize, ...)
you could use a namespace.
you could use labels when you create resources.
You just need sed to do this:
kubectl get pods --no-headers=true --all-namespaces |sed -r 's/(\S+)\s+(\S+).*/kubectl --namespace \1 delete pod \2/e'
Explains:
use command kubectl get pods --all-namespaces to get the list of all pods in all namespaces.
use --no-headers=true option to hide the headers.
use s command of sed to fetch the first two words, which represent namespace and pod's name respectively, then assemble the delete command using them.
the final delete command is just like:
kubectl --namespace kube-system delete pod heapster-eq3yw.
use the e modifier of s command to execute the command assembled above, which will do the actual delete works.
To avoid delete pods in kube-system namespace, just need to add grep -v kube-system to exclude kube-system namespace before the sed command.
I tried commands from listed answers here but pods were stuck in terminating state.
I found below command to delete all pods from particular namespace if stuck in terminating state or you are not able to delete it then you can delete pods forcefully.
kubectl delete pods --all --grace-period=0 --force --namespace namespace
Hope it might be useful to someone.
K8s completely works on the fundamental of the namespace. if you like to release all the resource related to specified namespace.
you can use the below mentioned :
kubectl delete namespace k8sdemo-app
steps to delete pv:
delete all deployment and pods or resources related to that PV
kubectl delete --all deployment -n namespace
kubectl delete --all pod -n namespace
edit pv
kubectl edit pv pv_name -n namespace
remove kubernetes.io/pv-protection
delete pv
kubectl delete pv pv_name -n namespace
Delete all PODs in all Namespace only (restart deployment)
kubectl get pod -A -o yaml | kubectl delete -f -
You can use kubectl delete pods -l dev-lead!=carisa or what label you have.
Here is a one-liner that can be extended with grep to filter by name.
kubectl get pods -o jsonpath="{.items[*].metadata.name}" | \
tr " " "\n" | \
xargs -i -P 0 kubectl delete pods {}
One line command to delete all pods in all namespaces.
kubectl get ns -o=custom-columns=Namespace:.metadata.name --no-headers | xargs -n1 kubectl delete pods --all -n
kubectl delete po,ing,svc,pv,pvc,sc,ep,rc,deploy,replicaset,daemonset --all -A
If you already have pods which are recreated, think to delete all deployments first
kubectl delete -n *NAMESPACE deployment *DEPLOYMENT
Just replace the NAMSPACE and the DEPLOYMENT to corresponding ones, you can get all deployments information by the following command
kubectl get deployments --all-namespaces
Kubectl bulk (bulk-action on krew) plugin may be useful for you, it gives you bulk operations on selected resources. This is the command for deleting pods
' kubectl bulk pods -n namespace delete '
You could check details in this
I create a python code to delete all in namespace
delall.py
import json,sys,os;
obj=json.load(sys.stdin);
for item in obj["items"]:
os.system("kubectl delete " + item["kind"] + "/" +item["metadata"]["name"] + " -n yournamespace")
and then
kubectl get all -n kong -o json | python delall.py
If you have multiple pod which are crashing or error and you want to delete them
kubectl delete pods --all -n | gep
It was hinted at above, but I just thought I would helpfully point out that the shortcut for "--all-namespaces" is "-A" that's with a capital A. HTH somebody. I've opened a PR to have this helpful hint added to the official Kubernetes Cheat Sheet.
If you want to delete pods in all namespaces just to have them restarted and you are aware that some of them will be recreated, I like the following for loop:
for i in $(kubectl get pods -A | awk '{print $1}' | uniq | grep -V NAMESPACE); do kubectl delete --all pods -n $i; done
if you have hpa, then scale down.