How to get status of pods?

[DivyaYash]

When I do a k8.namespaces.replicationcontrollers.pod.get(print); Its a very long o/p..I am interested in knowing if the pod is in "Running" status or not..How can I fetch this information?
Please help!

[silasbw]

@DivyaYash that short hand is useful when you want to get pods associated with a specific replication controller. For example,

k8.ns('my-ns').rc.po.get('my-rc', print);

You can see what pods are running be inspecting that result:

function print(err, result) {
  if (err) return console.warn(err);
  // Interesting stuff about about the Pod                                                                                                                                                                                     
  const statuses = result.podList.items.map(pod => pod.status);
  // The phase the Pod is in (e.g., 'Running' or 'Terminating')                                                                                                                                                                
  const phases = statuses.map(status => status.phase);
  console.log(`Pod phases for RC ${ result.rc.metadata.name }:`);
  console.log(phases);
}

[DivyaYash]

Getting a Type error..
const statuses = result.podList.items.map(pod => pod.status);
^
TypeError: Cannot read property 'items' of undefined

[silasbw]

can you post the code you're running?

[DivyaYash]

Just copied urs and trying...am very new, do not know much ..
var fs = require('fs');
const K8Api = require('kubernetes-client');
const k8 = new K8Api({
url: 'https://bfk8201:6443',
version: 'v1', // Defaults to 'v1'
ca: fs.readFileSync('ca.pem'),
cert: fs.readFileSync('kubernetes-caasadmin-user.pem'),
key: fs.readFileSync('kubernetes-caasadmin-user-key.pem'),
namespace: 'netflow'
});
function print(err, result) {
if (err) return console.warn(err);
// Interesting stuff about about the Pod
const statuses = result.podList.item.map(pod => pod.status);
// The phase the Pod is in (e.g., 'Running' or 'Terminating')
const phases = statuses.map(status => status.phase);
console.log(Pod phases for RC ${ result.rc.metadata.name }:);
console.log(phases);
}

k8.namespaces.replicationcontrollers.pod.get(print);

[silasbw]

Change this line:

k8.namespaces.replicationcontrollers.pod.get(print);

to include the name of the replication controller you're interested in. For example, if you want to get all pods associated with your replication controller named 'foo-rc', you'd do:

k8.namespaces.replicationcontrollers.pod.get('foo-rc', print);

If you're interested in getting status for all the Pods in a namespace, just do:

function print(err, result) {
  const statuses = result.item.map(pod => pod.status);
  const phases = statuses.map(status => status.phase);
  console.log(phases);
}
k8.namespaces.pods.get(print);

[DivyaYash]

Thanks for the quick response, I am interested in status of all pods, I tried as you suggested, but getting error - const statuses = result.item.map(pod => pod.status);
^

TypeError: Cannot read property 'map' of undefined

var fs = require('fs');
const K8Api = require('kubernetes-client');
const k8 = new K8Api({
//url: 'http://9.45.125.92:8080',
url: 'https://bfk8s01:6443',
version: 'v1', // Defaults to 'v1'
ca: fs.readFileSync('ca.pem'),
cert: fs.readFileSync('kubernetes-caasadmin-user.pem'),
key: fs.readFileSync('kubernetes-caasadmin-user-key.pem'),
namespace: 'bluecloud2'
//namespace: 'netflow'
});

function print(err, result) {
const statuses = result.item.map(pod => pod.status);
const phases = statuses.map(status => status.phase);
console.log(phases);
}
k8.namespaces.pods.get(print);

[DivyaYash]

Also, where can I know on "how to construct below calls"? which documentation I need to refer?
k8.namespaces.pods.get(print);
result.item.map(pod => pod.status);
statuses.map(status => status.phase);

[silasbw]

sorry, I typoed:

function print(err, result) {
  const statuses = result.items.map(pod => pod.status);
  const phases = statuses.map(status => status.phase);
  console.log(phases);
}

(notice items instead of item)

For general JavaScript reference there's MDN

For Kubernetes API documentation there's the Kubernetes Docs. E.g., here's the definition of the PodList which is the thing we're operating on above: http://kubernetes.io/docs/api-reference/v1/definitions/#_v1_podlist

Since this is more of JavaScript help question and less specific to kubernetes-client, I'm closing this again.

[DivyaYash]

Ok, thanks for your help, it worked!
The o/p seem to be listing some old non existing pods as well...The result of this call has a few pods in "Failed" status, however, when I check via kubectl get pods cmd, the results are different...