I am seeking to how to be able to use multiple parameter on kubernetes. For example:
kubectl get pods -n default || kube-system
(but the results of this query come out only the result of default namespace).
How can I use multiple params?
You can't query for multiple namespaces resources in one command.
As there is explanation why it is not worth to do that on this github issue
But you can query for multiple resources across one or --all-namespaces. For example got get services and pods for namespace kube-dns and default(this will include workaround as #PEkambaram suggested)
kubectl get svc,pods --all-namespaces |egrep -e 'kube-dns|default'
try this
kubectl get po --all-namespaces | grep kube-system
or even better
kubectl get po --all-namespaces | grep -iE 'dns|api'
Related
I have a lot of namespaces and I want to get all pods from a sub-list of namespaces.
For getting all the pods from all namespace the command is:
kubectl get pods --all-namespaces
To get all pods from a spesific namespace the command is:
kubectl get pods -n namespace-name
However I can't find a way to get all pods from a list of namespaces, something like:
kubectl get pods -n namespace-name1, namespace-name2, namespace-name3
what is the right command for that?
kubectl does not support this. You can use egrep to filter the list of all pods by namespaces:
kubectl get pods -A | egrep '^(namespace-name1|namespace-name2|namespace-name3)'
Because kubectl prints the namespace at the beginning of the line, it greps for a line start ^ followed by one of the namespace names.
You can iterate over the subset of namespaces:
Either:
for NAMESPACE in "namespace-1" "namespace-2"
do
kubectl get pods \
--namespace=${NAMESPACE} \
--output=name
done
Or:
NAMESPACE=$(
"namespace-1"
"namespace-2"
)
for NAMESPACE in "${NAMESPACES[#]}"
do
kubectl get pods \
--namespace=${NAMESPACE} \
--output=name
done
When I do
kubectl get pods -A
I get all pods, and I always have 17 pods that are not "apps", they belong to namespace kube-system. I would like to have an alias not to print them.
Is there a way to print all pods, excluding a namespace ?
You can accomplish this via field selectors:
kubectl get pods -A --field-selector=metadata.namespace!=kube-system
Additionally, the field selector list can have multiple parameters, separated by , (comma literals), and use == or != to specify additional criteria.
Use --field-selector
kubectl get pods --all-namespaces --field-selector metadata.namespace!=kube-system
more about field selectors here: https://kubernetes.io/docs/concepts/overview/working-with-objects/field-selectors/
I know I can get the pods using:
kubectl get pods -n "namespace", and also to retrieve a json output
I'm trying to expand to get the pods name, the associated images, and a label attribute called 'base'. Also the date when I retrieve this information.
You can try this using yaml output.
kubectl get pods --all-namespaces -o yaml| egrep "name:|image:"
This will give you name of pod and image which is there for running the pod.
OR
kubectl get pods --all-namespaces -o jsonpath="{.items[*].spec.containers[*].image}"
This command will give you all images which are there in all pods.
If you found this is difficult then use,
kubectl get pod --all-namespaces
Check which pods image you need to find then use,
kubectl describe pod <pod_name> -n <namespace>
For reference use Link
Here you can find the description of kubectl get command.
What are you looking for is this:
output o Output format. One of:
json|yaml|wide|name|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=...
See custom columns
[http://kubernetes.io/docs/user-guide/kubectl-overview/#custom-columns],
golang template [http://golang.org/pkg/text/template/#pkg-overview]
and jsonpath template [http://kubernetes.io/docs/user-guide/jsonpath].
For example:
List a pod identified by type and name specified in "pod.yaml" in JSON
output format:
kubectl get -f pod.yaml -o json
Adjust by using the flags that you need from there.
Please let me know if that helped.
You can try jsonpath to retrieve the values for json output.
kubectl get po --all-namespaces -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.spec.containers[0].image}{"\t"}{.metadata.labels.k8s-app}{"\n"}{end}'
probably you can write shell script and achieve this. first try to get all running pods across all namespaces using:
kubectl get pods -all-namespaces
and then iterate over each pod and execute following command:
kubectl describe pods <name of pod>
In the describe command you can get all information that you are looking for.
I have 3 nodes, running all kinds of pods. I would like to have a list of nodes and pods, for an example:
NODE1 POD1
NODE1 POD2
NODE2 POD3
NODE3 POD4
How can this please be achieved?
Thanks.
You can do that with custom columns:
kubectl get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName --all-namespaces
or just:
kubectl get pod -o=custom-columns=NODE:.spec.nodeName,NAME:.metadata.name --all-namespaces
kubectl has a simple yet useful extended output format that you can use like
kubectl get pod -o wide
so while custom formats provided in other answers are good, this might be a handy shortcut.
You can use kubectl get pods --all-namespaces to list all the pods from all namespaces and kubectl get nodes for listing all nodes.
The following command does more or less what you wanted. However, it's more of a jq trick than kubectl trick:
kubectl get pod --all-namespaces -o json | jq '.items[] | .spec.nodeName + " " + .status.podIP'
Not exactly as you wanted cause it describe much more, but you can use
kubectl describe nodes
it will expose each pod per node in the cluster with the following info
Namespace | Name | CPU Requests | CPU Limits | Memory Requests |
Memory Limits
This gets you: "nodeName namespace pod" across the cluster:
kubectl get pods --all-namespaces --output 'jsonpath={range .items[*]}{.spec.nodeName}{" "}{.metadata.namespace}{" "}{.metadata.name}{"\n"}{end}'
Maybe the answers are a little bit old, now you can simply launch this:
kubectl get pods -o wide
I am looking to list all the containers in a pod in a script that gather's logs after running a test. kubectl describe pods -l k8s-app=kube-dns returns a lot of info, but I am just looking for a return like:
etcd
kube2sky
skydns
I don't see a simple way to format the describe output. Is there another command? (and I guess worst case there is always parsing the output of describe).
Answer
kubectl get pods POD_NAME_HERE -o jsonpath='{.spec.containers[*].name}'
Explanation
This gets the JSON object representing the pod. It then uses kubectl's JSONpath to extract the name of each container from the pod.
You can use get and choose one of the supported output template with the --output (-o) flag.
Take jsonpath for example,
kubectl get pods -l k8s-app=kube-dns -o jsonpath={.items[*].spec.containers[*].name} gives you etcd kube2sky skydns.
Other supported output output templates are go-template, go-template-file, jsonpath-file. See http://kubernetes.io/docs/user-guide/jsonpath/ for how to use jsonpath template. See https://golang.org/pkg/text/template/#pkg-overview for how to use go template.
Update: Check this doc for other example commands to list container images: https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/
Quick hack to avoid constructing the JSONpath query for a single pod:
$ kubectl logs mypod-123
a container name must be specified for pod mypod-123, choose one of: [etcd kubesky skydns]
I put some ideas together into the following:
Simple line:
kubectl get po -o jsonpath='{range .items[*]}{"pod: "}{.metadata.name}{"\n"}{range .spec.containers[*]}{"\tname: "}{.name}{"\n\timage: "}{.image}{"\n"}{end}'
Split (for readability):
kubectl get po -o jsonpath='
{range .items[*]}
{"pod: "}
{.metadata.name}
{"\n"}{range .spec.containers[*]}
{"\tname: "}
{.name}
{"\n\timage: "}
{.image}
{"\n"}
{end}'
How to list BOTH init and non-init containers for all pods
kubectl get pod -o="custom-columns=NAME:.metadata.name,INIT-CONTAINERS:.spec.initContainers[*].name,CONTAINERS:.spec.containers[*].name"
Output looks like this:
NAME INIT-CONTAINERS CONTAINERS
helm-install-traefik-sjts9 <none> helm
metrics-server-86cbb8457f-dkpqm <none> metrics-server
local-path-provisioner-5ff76fc89d-vjs6l <none> local-path-provisioner
coredns-6488c6fcc6-zp9gv <none> coredns
svclb-traefik-f5wwh <none> lb-port-80,lb-port-443
traefik-6f9cbd9bd4-pcbmz <none> traefik
dc-postgresql-0 init-chmod-data dc-postgresql
backend-5c4bf48d6f-7c8c6 wait-for-db backend
if you want a clear output of which containers are from each Pod
kubectl get po -l k8s-app=kube-dns \
-o=custom-columns=NAME:.metadata.name,CONTAINERS:.spec.containers[*].name
To get the output in the separate lines:
kubectl get pods POD_NAME_HERE -o jsonpath='{range .spec.containers[*]}{.name}{"\n"}{end}'
Output:
base-container
sidecar-0
sidecar-1
sidecar-2
If you use json as output format of kubectl get you get plenty details of a pod. With json processors like jq it is easy to select or filter for certain parts you are interested in.
To list the containers of a pod the jq query looks like this:
kubectl get --all-namespaces --selector k8s-app=kube-dns --output json pods \
| jq --raw-output '.items[].spec.containers[].name'
If you want to see all details regarding one specific container try something like this:
kubectl get --all-namespaces --selector k8s-app=kube-dns --output json pods \
| jq '.items[].spec.containers[] | select(.name=="etcd")'
Use below command:
kubectl get pods -o=custom-columns=PodName:.metadata.name,Containers:.spec.containers[*].name,Image:.spec.containers[*].image
To see verbose information along with configmaps of all containers in a particular pod, use this command:
kubectl describe pod/<pod name> -n <namespace name>
Use below command to see all the information of a particular pod
kubectl get pod <pod name> -n <namespace name> -o yaml
For overall details about the pod try following command to get the container details as well
kubectl describe pod <podname>
I use this to display image versions on the pods.
kubectl get pods -o=jsonpath='{range .items[*]}{"\n"}{.metadata.name}{":\t"}{range .spec.containers[*]}{.image}{end}{end}' && printf '\n'
It's just a small modification of script from here, with adding new line to start next console command on the new line, removed commas at the end of each line and listing only my pods, without service pods (e.g. --all-namespaces option is removed).
There are enough answers here but sometimes you want to see a deployment object pods' containers and initContainers. To do that;
1- Retrieve the deployment name
kubectl get deployment
2- Retrieve containers' names
kubectl get deployment <deployment-name> -o jsonpath='{.spec.template.spec.containers[*].name}'
3- Retrieve initContainers' names
kubectl get deployment <deployment-name> -o jsonpath='{.spec.template.spec.initContainers[*].name}'
Easiest way to know the containers in a pod:
kubectl logs -c -n