I couldn't find the status jsonpath when using kubectl. The pod json has a status field but it is an array.
kubectl get pods --column=Status:.status[*]
There are several elements in the array, how can I select the one for real pod status?
One must enable jsonpath output, via kubectl get pods --output="jsonpath={.status}", not via --column
The results were an array because as written kubectl is returning all Pods that are in the current namespace. To get a singular Pod status, qualify your request with:kubectl get pod $the_pod_name_here --output="jsonpath={.status}"if you really do want the status of all pods, then --output="jsonpath={.items[*].status}" is likely the syntax you were seeking
Related
I want to get pod with label
app=vovo
component=db
When i get a pod with label app=vovo and component=db, i can get the result with below command.
kubectl get pod -l app=vovo,component=db
However, when i want to get the result
app=vovo or component=db
How can i get the result with one kubectl command?
OR operations for label selection is not supported as per the documentation
Caution: For both equality-based and set-based conditions there is no
logical OR (||) operator. Ensure your filter statements are structured
accordingly
Here is a close hack you could do:
kubectl get pod -l app=volvo && kubectl get pod -l component=db --no-headers
This will run two kubectl queries for two different labels.
I need to retrieve a list of pods by selecting their corresponding labels.
When the pods have a simple label app=foo, k8s-app=bar, the selection is quite easy:
kubectl get po -l 'app in (foo), k8s-app in (bar)'
The complexity comes with labels that contain special characters, for example: app.kubernetes.io/name=foo
So when I query only this label, I don't have a problem, but if I try to add this label to the existing query, it will end by returning no resources were found.
kubectl get po -l app.kubernetes.io/name=foo,app=bar
kubectl get po -l 'app.kubernetes.io/name in (foo), app in (bar)'
Any idea how can I join the two labels in a single query?
Currently, Kubernetes does not support OR in label selectors. You can only OR different values of the same label (like kubectl get pods -l 'app in (foo,bar)').
See also How can the OR selector be used with labels in Kubernetes?
You can use below command for retrieving a list of pods by selecting their corresponding labels.
kubectl get pods --selector app=foo,k8s-app=bar
Background: A while ago cert-manager introduced a breaking change in their CRDs. This leads to two CRDs having the name order, which can be seen in kubectl api-resources
How can I list orders from just the newer CRD?
I recall there was something like kubectl get acme.cert-manager.io/order (which is not correct), but cannot piece together anymore.
An excerpt of kubectl api-resources | grep "order" would be
orders acme.cert-manager.io true Order
orders certmanager.k8s.io true Order
You should be able to get specific resource using below commands
To get list of orders in acme.cert-manager.io
kubectl get orders.acme.cert-manager.io
To get list of orders in certmanager.k8s.io
kubectl get orders.certmanager.k8s.io
Is there a simple method (that won't require googling at every use) to get names of all deployment configs with no running pods (scaled to 0) in Kubernetes / Openshift? Methods without JSON tokens and awk please.
The docs of oc get dc --help are way too long to decipher for the occasional need.
The only CLI arg for advanced filtering without working with JSON is a --field-selector, but it has a limited scope which not include spec.replicas field.
So, there will be some magic around JSON with other flag - jsonpath.
Here is a command to filter and print names of all deployments which are scaled to 0:
kubectl get deployments --all-namespaces -o=jsonpath='{range .items[?(#.spec.replicas==0)]}{.metadata.name}{"\n"}{end}'
Jsonpath reference is here.
I was trying to get the Ready status of pods by using -o=jsonpath.
To be more clear of what I want, I would like to get the value 1/1 of the following example using -o=jsonpath.
NAME READY STATUS RESTARTS AGE
some_pod 1/1 Running 1 34d
I have managed to get some information such as the pod name or namespace.
kubectl get pods --all-namespaces -o=jsonpath='{range .items[*]}{"\n"}{.metadata.namespace}{"\t"}{.metadata.name}{"\t"}{end}'
And I get somthing like:
some_namespace1 pod_name1
However, I don't know how to get the Ready status. What I would like to have is an aoutput similar to this:
some_namespace1 pod_name1 1/1
I know I can use bash commands like cut:
kubectl get pods --all-namespaces| tail -1 | cut -d' ' -f8
However, I would like to get it by using kubectl
You can get all the pods status using the following command:
kubectl get pods -o jsonpath={.items[*].status.phase}
Similar commands you can use for the name
kubectl get pods -o jsonpath={.items[*].metadata.name}
EDIT:
You need to compare the .status.replicas and .status.readyReplicas to get how many ready replicas are there.
I think this isn't directly reported in the Kubernetes API.
If you kubectl get pod ... -o yaml (or -o json) you'll get back an object matching a List (not included in the API docs) where each item is a Pod in the Kubernetes API, and -o jsonpath values follow that object structure. In particular a PodStatus has a list of ContainerStatus, each of which may or may not be ready, but the API itself doesn't return the counts as first-class fields.
There are a couple of different JSONPath implementations. I think Kubernetes only supports the syntax in the Kubernetes documentation, which doesn't include any sort of "length" function. (The original JavaScript implementation and a ready Googlable Java implementation both seem to, with slightly different syntax.)
The best I can come up with playing with this is to report all of the individual container "ready" statuses
kubectl get pods \
-o $'jsonpath={range .items[*]}{.metadata.name}\t{.status.containerStatuses[*].ready}\n{end}'
($'...' is bash/zsh syntax) but this still requires some post-processing to get back the original counts.