Krew custom columns

My contribution to the custom-cols plugin for Krew: show what nodes pods are running on.

Create a file ~/.krew/store/custom-cols/v0.0.5/tamplates/node.tpl so that it contains:

NAME NODE STATUS .metadata.name .spec.nodeName .status.phase

The output will look something like:

tim@cf-desk:~$ kubectl custom-cols -o node pods -n weave NAME NODE STATUS weave-scope-agent-g9jgh cf1 Running weave-scope-agent-gllg5 cf2 Running weave-scope-agent-kkm2z cf3 Running weave-scope-app-658845597b-wnt9b cf2 Running weave-scope-cluster-agent-84f7b6767c-2vdkw cf2 Running

There may also be some value in making it sortable, based on the node. To do so, create another template (I called mine "nodes.tpl")and swap the first and second columns in each row. Then you can pipe the output through the tail and sort commands. Example template:

NODE NAME STATUS .spec.nodeName .metadata.name .status.phase

The output will look something like:

tim@cf-desk:~$ k custom-cols -o nodes pods -n weave|tail -n +2|sort cf1 weave-scope-agent-g9jgh Running cf2 weave-scope-agent-gllg5 Running cf2 weave-scope-app-658845597b-wnt9b Running cf2 weave-scope-cluster-agent-84f7b6767c-2vdkw Running cf3 weave-scope-agent-kkm2z Running

For info: the "-n +2" in the above tells tail to start processing on the second line (i.e., skip the line with the column headers).