The use case is to get the environment variable *COUNTRY from all the pods running in a namespace
kubectl get pods podname -n namespace -o 'jsonpath={.spec.containers[0].env[?(#.name~="^COUNTRY")].value}'
This does not seem to work. any lead?
You can retrieve this information using the following command:
kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{.spec.containers[*].env[*].name}{"\t"}{.spec.containers[*].env[*].value}{"\n"}{end}' | grep COUNTRY | cut -f 2
It will return the variables content as follows:
$ kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{.spec.containers[*].env[*].name}{"\t"}{.spec.containers[*].env[*].value}{"\n"}{end}' | grep VAR | cut -f 2
123456
7890123
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].env[?(#.name=="COUNTRY")].value}'
Hope this helps. I was just able to run it on mine and it worked the best.
Related
I wanted to hit a command which searches pod with the service name and identify its pod's status as "Ready"
I tried some of the commands but it does not work and it does not search with service-name.
kubectl get svc | grep my-service | --output="jsonpath={.status.containerStatuses[*].ready}" | cut -d' ' -f2
I tried to use the loop also, but the script does not give the desired output.
Can you please help me figure out the exact command?
If I understood you correctly, you want to find if specific Pod connected to specific Endpoint - is in "Ready" status .
Using JSON PATH you can display all Pods in specific namespace with their status:
$ kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.phase}{"\n"}{end}'
If you are looking for status for Pods connected to specific Endpoint, you can use below script:
#!/bin/bash
endpointName="web-1"
for podName in $(kubectl get endpoints $endpointName -o=jsonpath={.subsets[*].addresses[*].targetRef.name}); do
if [ ! -z $podName ]; then
kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.phase}{"\n"}{end}' | grep $podName
fi
done
for podName in $(kubectl get endpoints $endpointName -o=jsonpath={.subsets[*].notReadyAddresses[*].targetRef.name}); do
if [ ! -z $podName ]; then
kubectl get pod -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.phase}{"\n"}{end}' | grep $podName
fi
done
Please note that you need to change Endpoint name to your needs, in above example I use web-1 name.
If this response doesn't answer your question, please specify your exact purpose.
every service create a endpoints which contain the podIp and other info for service. you can just use that endpoints to get you pods. . it will show you the ready pod for your my-service.
use this command:
kubectl get endpoints -n <Name_space> <service_name> -o json | jq -r 'select(.subsets != null) | select(.subsets[].addresses != null) | .subsets[].addresses[].targetRef.name'
for you the command will be:
kubectl get endpoints my-service -o json | jq -r 'select(.subsets != null) | select(.subsets[].addresses != null) | .subsets[].addresses[].targetRef.name'
you can run the script for getting the pod status
#!/usr/bin/env bash
for podname in $(kubectl get endpoints my-service -o json | jq -r 'select(.subsets != null) | .subsets[].addresses[].targetRef.name')
do
kubectl get pods -n demo $podname -o json | jq -r ' select(.status.conditions[].type == "Ready") | .status.conditions[].type ' | grep -x Ready
done
Very easy and native command:
kubectl get pods --field-selector status.phase=Running
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!!
I would like to see all resources in a namespace.
Doing kubectl get all will, despite of the name, not list things like services and ingresses.
If I know the the type I can explicitly ask for that particular type, but it seems there is also no command for listing all possible types. (Especially kubectl get does for example not list custom types).
Any idea how to show all resources before for example deleting that namespace?
Based on this comment , the supported way to list all resources is to iterate through all the api versions listed by kubectl api-resources:
kubectl api-resources enumerates the resource types available in your cluster.
this means you can combine it with kubectl get to actually list every instance of every resource type in a namespace:
kubectl api-resources --verbs=list --namespaced -o name \
| xargs -n 1 kubectl get --show-kind --ignore-not-found -l <label>=<value> -n <namespace>
This may not get all resources but it may be what someone is looking for
kubectl get all,cm,secret,ing -A
This seems to get most of the resources, prefixed with the type.
At least, it gets:
pod
service
daemonset
deployment
replicaset
statefulset
job
configmap
secret
ingress
This doesn't get custom resources but does get services.
Else this does something similar:
for i in `kubectl api-resources | awk '{print $1}'`; do kubectl get $i; done
Running v1.13
I ended up needing this same functionality due to failed Helm deployments that left remnants in a specific namespace. Here's a function you can put in your bash profile:
function kubectlgetall {
for i in $(kubectl api-resources --verbs=list --namespaced -o name | grep -v "events.events.k8s.io" | grep -v "events" | sort | uniq); do
echo "Resource:" $i
if [ -z "$1" ]
then
kubectl get --ignore-not-found ${i}
else
kubectl -n ${1} get --ignore-not-found ${i}
fi
done
}
Usage: kubectlgetall <namespace>
Example: get all resources from the kafka namespace:
kubectlgetall kafka
Complete solution
kubectl -n <NAMESPACE> get $(kubectl api-resources --namespaced=true --no-headers -o name | egrep -v 'events|nodes' | paste -s -d, - ) --no-headers
Answer of rcorre is correct but for N resources it make N requests to cluster (so for a lot of resources this approach is very slow). Moreover, not found resources (that have not instances) are very slow for getting with kubectl get.
There is a better way to make a request for multiple resources:
kubectl get pods,svc,secrets
instead of
kubectl get pods
kubectl get svc
kubectl get secrets
So the answer is:
#!/usr/bin/env bash
# get all names and concatenate them with comma
NAMES="$(kubectl api-resources \
--namespaced \
--verbs list \
-o name \
| tr '\n' ,)"
# ${NAMES:0:-1} -- because of `tr` command added trailing comma
# --show-kind is optional
kubectl get "${NAMES:0:-1}" --show-kind
or
#!/usr/bin/env bash
# get all names
NAMES=( $(kubectl api-resources \
--namespaced \
--verbs list \
-o name) )
# Now join names into single string delimited with comma
# Note *, not #
IFS=,
NAMES="${NAMES[*]}"
unset IFS
# --show-kind is enabled implicitly
kubectl get "$NAMES"
If you are using kubectl krew plug-in, I will suggest using get-all.
It can get almost 90% of resources. Including configmap, secret, endpoints, istio, etc...
A Powershell implementation of rcorre's answer would look like
kubectl api-resources --verbs=list --namespaced -o name | `
%{ kubectl get $_ --show-kind --ignore-not-found -l <label>=<value> -n <namespace> }
All kubernetes objects are stored in etcd.
All objects are stored in ETCD v3 the following way:
/registry/<object_type>/<namespace>/<name>
I suggest just to take the list of all resources of some namespace from etcd v3 directly:
ETCDCTL_API=3 etcdctl --endpoints=<etcd_ip>:2379 get / --prefix --keys-only | grep -E "^/\w+/\w+/<namespace>/+"
Just covering some basics:
Resources can be fetched using the kubectl get command.
Resources can be filtered by namespace using the -n [NAMESPACE] or --namespace [NAMESPACE] flags.
I will use the -A (same as --all-namespaces) flag in the following examples for brevity.
Some of the other answers show how to list available resource types:
kubectl api-resources --verbs=list -o name
With this in mind, we can get all resources, leveraging xargs and sed:
kubectl get "all,$(kubectl api-resources --verbs=list -o name | xargs | sed 's/ /,/g')" -A
An alternative to xargs is to use tr:
kubectl get "$(kubectl api-resources --verbs=list -o name | tr '\n' ',')all" -A
I think this could be se simplest way to print out all the resource name in a kubernetes cluster:
#!/bin/bash
for resource in [$(kubectl api-resources -o name | tr "\n" " ")]
do
kubectl get $resource --all-namespaces -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}'
done
to specify the namespace you just need to modify the line in the loop setting --namespace=<your-namespace> and remove --all-namespaces
Here's a PowerShell version of what other's have said
function getall {
# https://stackoverflow.com/questions/47691479/listing-all-resources-in-a-namespace
[CmdletBinding()]
param(
$namespace
)
$types=kubectl api-resources --verbs=list --namespaced -o name
kubectl get $($types -join ",") -n $namespace --show-kind
}
It's not a 100% solution, but for me works the following
kgetall='kubectl get namespace,replicaset,secret,nodes,job,daemonset,statefulset,ingress,configmap,pv,pvc,service,deployment,pod --all-namespaces'
and just call
kgetall
But obviously I expected that behavior from
kubectl get all --all-namespaces
in the first place.
Following this solution, in fish shell it looks like below.
Add the following function to your ~/.config/fish/config.fish
function kall
kubectl -n $argv get (string join ',' (kubectl api-resources --namespaced --verbs list -o name))
end
the easy way for me to retrieve all the contents of the namespace was
kubectl get all -n
I've found jsonpath examples for testing multiple values but not extracting multiple values.
I want to get image and name from kubectl get pods.
this gets me name
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].name}' | xargs -n 1
this gets me image
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].image}' | xargs -n 1
but
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].[name,image}' | xargs -n 2
complains invalid array index image - is there a syntax for getting a list of node-adjacent values?
Use below command to get name and image:
kubectl get pods -Ao jsonpath='{range .items[*]}{#.metadata.name}{" "}{#.spec.template.spec.containers[].image}{"\n"}{end}'
It will give output like below:
name image
Useful command, I had to modify it a little to make it work (failed with -a flag). Also, I added a filter to app label and one more field to get: namespace, pod name, image
kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{#.metadata.namespace}{"\t"}{#.metadata.name}{"\t"}{#.spec.containers[*].image}{"\n"}{end}' -l app=nginx
Thanks! I had to change a little bit, but this worked for me:
#!/bin/bash
releases=$(kubectl get deployment -A --output=jsonpath='{range .items[*]}{#.metadata.namespace}{"|"}{#.metadata.name}{"\n"}{end}')
for release in $releases; do
namespace=$( echo $release | cut -d "|" -f 1)
deployment=$( echo $release | cut -d "|" -f 2)
kubectl rollout restart deployments -n "${namespace}" "${deployment}"
done
I looking for the option to list all pods name
How to do without awk (or cut). Now i'm using this command
kubectl get --no-headers=true pods -o name | awk -F "/" '{print $2}'
Personally I prefer this method because it relies only on kubectl, is not very verbose and we don't get the pod/ prefix in the output:
kubectl get pods --no-headers -o custom-columns=":metadata.name"
You can use the go templating option built into kubectl to format the output to just show the names for each pod:
kubectl get pods --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'
Get Names of pods using -o=name Refer this cheatsheet for more.
kubectl get pods -o=name
Example output:
pod/kube-xyz-53kg5
pod/kube-xyz-jh7d2
pod/kube-xyz-subt9
To remove trailing pod/ you can use standard bash sed command
kubectl get pods -o=name | sed "s/^.\{4\}//"
Example output:
kube-xyz-53kg5
kube-pqr-jh7d2
kube-abc-s2bt9
To get podname with particular string, standard linux grep command
kubectl get pods -o=name | grep kube-pqr | sed "s/^.\{4\}//"
Example output:
kube-pqr-jh7d2
With this name, you can do things, like adding alias to get shell to running container:
alias bashkubepqr='kubectl exec -it $(kubectl get pods -o=name | grep kube-pqr | sed "s/^.\{4\}//") bash'
You can use custom-columns in output option to get the name and --no-headers option
kubectl get --no-headers=true pods -l app=external-dns -o custom-columns=:metadata.name
You can use -o=name to display only pod names. For example to list proxy pods you can use:
kubectl get pods -o=name --all-namespaces | grep kube-proxy
The result is:
pod/kube-proxy-95rlj
pod/kube-proxy-bm77b
pod/kube-proxy-clc25
There is also this solution:
kubectl get pods -o jsonpath={..metadata.name}
Here is another way to do it:
kubectl get pods -o=name --field-selector=status.phase=Running
The --field-selector=status.phase=Running is needed as the question mention all the running pod names. If the all in the question is for all the namespaces, just add the --all-namespaces option.
Note that this command is very convenient when one want a quick way to access something from the running pod(s), such as logs :
kubectl logs -f $(kubectl get pods -o=name --field-selector=status.phase=Running)
Get all running pods in the namespace
kubectl get pods --field-selector=status.phase=Running --no-headers -o custom-columns=":metadata.name"
From viewing, finding resources.
You could also specify namespace with -n <namespace name>.
jsonpath alternative
kubectl get po -o jsonpath="{range .items[*]}{#.metadata.name}{end}" -l app=nginx-ingress,component=controller
see also:
more examples of kubectl output options
If you want to extract specific container's pod name then
A simple command can do all the hard work
kubectl get pods --template '{{range .items}}{{.metadata.name}}{{end}}' --selector=app=<CONTAINER-NAME>
Just replace <CONTAINER-NAME> with your service container-name
Well, In our case we have kept pods inside different namespace, here to identify the specific pod or list of pods we ran following command-
Approach 1:
To get the list of namespaces
kubectl get ns -A
To get all the pods inside one namespaces kubectl get pods -n <namespace>
Approach 2:
Use this command-
kubectl get pods --all-namespaces
kubectl exec -it $(kubectl get pods | grep mess | awk '{print $1}') /bin/bash
kubectl get po --all-namespaces | awk '{if ($4 != "Running") system ("kubectl -n " $1 " delete pods " $2 " --grace-period=0 " " --force ")}'