How to list the pods running in a particular zone?
And suppose my cluster is configured into multiple zones, how to ensure pods are distributed into every zone?
Topology key zone value is a label applied on nodes and so you can get the nodes with 'zone-value' and list pods of those nodes.
Somethig like below,
kubectl get nodes -l zone:<zone value> -o json | jq '.items[].metadata.name' | xargs -I worker sh -c 'kubectl get pods -o wide | grep worker'
kubectl get nodes --show-labels|awk 'NR == 1 {next} {print $1,$6}'|awk -F "/" '{print $1,$NF}'|awk '{print $1,$NF}'|awk -F "=" '{print $1,$NF}'|awk '{print $1,"\t",$NF;}'
Related
I want to list a node's pods and pod statues, eg.
Node A
Pod1 Status
Pod2 Status
Node B
Pod1 Status
Pod2 Status
Is there a kubectl command I can use for this?
kubectl get pods
will give you almost what you want, but it has no Node information, that is why you would need -o wide (I doubt you really want the -A parameter here); then you need a bit of awk. So may be like this:
kubectl get pods -o wide | awk '{print $1" "$3" "$7}
This script gives exactly the output you want:
kubectl get --no-headers pods --all-namespaces -o wide > /tmp/allpods
while read node; do
echo "${node/node\//}"
grep " ${node/node\//} " /tmp/allpods | \
while read line; do
set -- $line
echo "$2 $4"
done
done < <(kubectl get nodes --no-headers --output=name)
But this version has a more readable output in my opinion:
first column: k8s node name
second column: namespace/pod-name
third column: pod status
kubectl get --no-headers pods --all-namespaces -o wide > /tmp/allpods
while read node; do
echo "${node/node\//}"
while read line; do
set -- $line
echo " $2 $4"
done < <(grep " ${node/node\//} " /tmp/allpods)
done < <(kubectl get nodes --no-headers --output=name) | column -t -s ' '
Output:
k8s-node01
my-namespace01/mypod01-321-86d58674d8-kv222 Completed
my-namespace01/mypod01-321-redis-55dc88454c-z6xfj Running
[...]
k8s-node02
[...]
Doing an API call for each cluster node, as the accepted answer suggests, makes the script execution very long in a production environment with dozens of nodes and thousands of pods. That's why I opted for a solution where the result of a single call is saved to a temporary file.
Try this:
kubectl get pods -A --field-selector spec.nodeName=<node name> | awk '{print $2" "$4}'
I'm trying to delete Kubernetes evicted pods which are older than 30 days from all namespaces, but the command throws an error :
Error from server(NotFound): pods (xxxxxxxxxxxxx) not found
Command:
kubectl delete pod $(kubectl get pods --all-namespaces | grep Evicted | sed 's#d$##' | awk '$6 > 30 {print $2}')"
Any ideas?
i think it's due to when you are listing down the pod you are listing all pod and deleting all those
but command
kubectl delete pod not getting the namespace from which to delete the specific pod
kubectl delete pod $(kubectl get pods --all-namespaces | grep Evicted | awk '$6 > 30 {print $2}') -n $(kubectl get pods --all-namespaces | grep Evicted | awk '$6 > 30 {print $1}')
maybe you try something like or simplify it better way.
This assumes the GNU coreutils version of date and a bourne-like shell:
One-liner:
onemonthago=$(date -u -d '-1 month' +"%FT%TZ"); kubectl get pod --field-selector='status.phase=Failed' -o custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name,STATUS:.status.reason,STARTTIME:.status.startTime -A | while read ns pod status starttime; do if [ "$status" = "Evicted" ]; then if [ "$starttime" \> "$onemonthago" ]; then kubectl -n $ns delete pod $pod --wait=false; fi; fi; done
More readable formatting:
onemonthago=$(date -u -d '-1 month' +"%FT%TZ");
kubectl get pod --field-selector='status.phase=Failed' -o custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name,STATUS:.status.reason,STARTTIME:.status.startTime -A | while read ns pod status starttime; do
if [ "$status" = "Evicted" ]; then
if [ "$starttime" \> "$onemonthago" ]; then
kubectl -n $ns delete pod $pod --wait=false;
fi;
fi;
done
The details:
onemonthago=$(date -u -d '-1 month' +"%FT%TZ"); gets the cutoff time in the same format as what kubectl returns and stores it in a shell variable.
The kubectl then gets all the failed pods and outputs the columns that we need for further steps.
It then gets piped to a while loop that reads the fields into shell variables.
The if statements then check whether the pod was evicted or is failed for another reason (The status.reason field is not supported for --field-selector) and that it is older than a month. If it matches that criteria, it deletes it.
(It is likely possible to optimise it to gather a list of all pods in a namespace and pass that to the minimum number of kubectls using xargs in one go) (Both checks can be combined, either in the shell or in AWK as well) (Replacing the entire while with an elaborate AWK script would likely yield the best perfomance (collecting a list of pos to delete per namespace and running / outputting the delete command from the END pattern)
I'm looking for a command like "gcloud config get-value project" that retrieves a project's name, but for a pod (it can retrieve any pod name that is running). I know you can get multiple pods with "kubectl get pods", but I would just like one pod name as the result.
I'm having to do this all the time:
kubectl get pods # add one of the pod names in next line
kubectl logs -f some-pod-frontend-3931629792-g589c some-app
I'm thinking along the lines of "gcloud config get-value pod". Is there a command to do that correctly?
There are many ways, here are some examples of solutions:
kubectl get pods -o name --no-headers=true
kubectl get pods -o=name --all-namespaces | grep kube-proxy
kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'
For additional reading, please take a look to these links:
kubernetes list all running pods name
Kubernetes list all container id
https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/
You can use the grep command to filter any output on stdout. So to get pods matching a specified pattern you can use a command like this:
> kubectl get pods --all-namespaces|grep grafana
Output:
monitoring kube-prometheus-grafana-57d5b4d79f-smkz6 2/2 Running 0 1h
To only output the pod name, you can use the awk command with a parameter of '{print $2}', which displays the second column of the previous output:
kubectl get pods --all-namespaces|grep grafana|awk '{print $2}'
To only display one line you can use the head command like so:
kubectl get pods --all-namespaces|grep grafana|awk '{print $2}'|head -n 1
This will output the last pod name :
kubectl get pods -o go-template --template ' {{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | awk '{print $1}' | tail -n 1
if you want to fetch logs for a pod:
kubectl logs -f kubectl get pods -o go-template --template ' {{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | awk '{print $1}' | tail -n 1
just run the command with a single quotes.
Links:
kubernetes list all running pods name
https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/
Hope this helps!!
Is it possible to delete POD in kubernetes based on creation time or age?
Example : I would like to delete all PODs which are older than 1 day. These PODs are orphaned , therefore no new PODs will be created.
This command will delete all PODs older than one day :
kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}} {{.metadata.creationTimestamp}}{{"\n"}}{{end}}' | awk '$2 <= "'$(date -d 'yesterday' -Ins --utc | sed 's/+0000/Z/')'" { print $1 }' | xargs --no-run-if-empty kubectl delete pod
This command will delete all PODs older than 4 hours :
kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}} {{.metadata.creationTimestamp}}{{"\n"}}{{end}}' | awk '$2 <= "'$(date -d'now-4 hours' -Ins --utc | sed 's/+0000/Z/')'" { print $1 }' | xargs --no-run-if-empty kubectl delete pod
We could do this with awk by doing a regex [0-9]+d directly on the AGE ($5, 5th column) column and then printing the corresponding NAME ($1, first column) column
kubectl delete pod $(kubectl get pod | awk 'match($5,/[0-9]+d/) {print $1}')
Test first to see what's matching:
kubectl get pod | awk 'match($5,/[0-9]+d/) {print $0}'
$0 means all columns
You can either add a liveness probe to track how long the pod alive and kill it when it's longer a certain period. Or you can schedule a CronJob
modified to work on mac:
# try the gnu versions: gxargs
brew install findutils coreutils
kubectl get pods -o go-template -n gui2 --template '{{range .items}}{{.metadata.name}} {{.metadata.creationTimestamp}}{{"\n"}}{{end}}' | awk '$2 <= "'$(gdate -d '21 days ago' -Ins --utc | sed 's/+0000/Z/')'" { print $1 }' | gxargs --no-run-if-empty kubectl delete pod
Here is an alternative answer that uses kubectl, jq, and xargs.
It works locally for me on Mac, but I also uses it in a Kubernetes cronjob that runs debian-slim, so I think it works on both Mac and Linux.
The time is set in seconds (86400s here for 1 day).
kubectl get pod -o json | jq -r --argjson timestamp 86400 '.items[] | select (.metadata.creationTimestamp | sub("\\..*";"Z") | sub("\\s";"T") | fromdate < now - $timestamp).metadata.name' | xargs -r -L1 kubectl delete pod ;
Here's a variant of the answer by dansl1982 above that will delete all pods with a particular label in all namespaces.
kubectl get pods -A -l app=my-api -o go-template --template '{{range .items}}{{.metadata.namespace}} {{.metadata.name}} {{.metadata.creationTimestamp}}{{"\n"}}{{end}}' | awk '$3 <= "'$(date -d'now-4 hours' -Ins --utc | sed 's/+0000/Z/')'" { print $1 " " $2 }' | xargs -L 1 --no-run-if-empty kubectl delete pod -n $1 $2
I have a 6 minion cluster and would like to know how many of these minions are actually hosting pods at any given time. Is there a specific command for that ? Right now Im using a very generic command.
kubectl get po | grep Running > RUNNING.txt
for i in `cat RUNNING.txt `; do kubectl describe po $i; done | grep "Started container with docker
"
Any direct command to fetch the info I want ?
Just add -o wide:
kubectl get pod -o wide
This command will print all the nodes that have pods running on them:
kubectl get pods -o jsonpath='{range .items[*]}{.spec.nodeName} {end}' | tr " " "\n" | sort | uniq