Jeffery B.'s Blog

Openshift/kubernetes: field selectors

Jeffery Bagirimvano -

Sometimes, I just want to see the pods where status=failed or status=running and that's where --field-selector comes in handy.

--field-selector='': Selector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The server only supports a limited number of field queries per type.

$ oc get pods --all-namespaces --field-selector=status.phase=Failed
$ oc get pods --all-namespaces --field-selector=status.phase=Running
$ oc get pods --all-namespaces --field-selector=status.phase!=Running

So, if you just want running pods in all namespaces, you could something like:

$ oc get pods --all-namespaces --field-selector=status.phase=Running
NAMESPACE               NAME                                      READY     STATUS             RESTARTS   AGE
default                 docker-registry-1-xj6tx                   1/1       Running            3          97d
default                 nfs-client-provisioner-5b4bfff58c-bz76z   1/1       Running            1          1d
default                 registry-console-4-ql6np                  1/1       Running            2          61d
default                 router-1-vg9rf                            1/1       Running            2          81d

Or if you want to get all failed pods:

$ oc get pods --all-namespaces --field-selector=status.phase=Failed
NAMESPACE              NAME                                                   READY     STATUS             RESTARTS   AGE
cluster-management     cronjob-prune-images-1535241600-4sq9z                  0/1       DeadlineExceeded   0          4d
cluster-management     cronjob-prune-resources-builds-1535241600-4zxrq        0/1       DeadlineExceeded   0          4d
cluster-management     cronjob-prune-resources-deployments-1535241600-55s8b   0/1       DeadlineExceeded   0          4d
logging                logging-es-data-master-8u8oilnz-7-2fr7j                0/2       Evicted            0          45d

and if you want to delete them, then you could do something like:

$ oc delete $(oc get pods --field-selector=status.phase=Failed -o name -n cluster-management) -n cluster-management

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