Description

Check script to monitor the replica set status of a Kubernetes Deployment

---

How it works

For a given deployment, the number of ready pods is compared against the defined number of replicas minus the Max Unavailable value defined in the Rolling Update Strategy. A metric of 'replicas' is ommited as performance data.

Results:

• OK: The number of ready pods exceeds the required number of pods
• WARNING: The number of ready pods is equal to the required number of pods
• ERROR: The number of ready pods is below the required number of pods

---

Usage

user@host:~$ ./check_kube_deployment_replica_status.py -h
usage: check_kube_deployment_replica_status.py [-h] -d DEPLOYMENT
                                               [-n NAMESPACE]
 
user@host:~$ ./check_kube_deployment_replica_status.py -d deployment-foo -n namespace-bar
OK, test deployment has 8 pods ready of the 8 required | replicas=8

---

Requirements

A working kubernetes configuration via either a config file at ~/.kube/config or the environment variable KUBECONFIG

Python libraries

• argparse
• kubernetes