Memcached with Prometheus Exporter for Kubernetes

This project shows how to run a memcached in your Kubernetes cluster. Memcached is stateless, so it is a pleasure to run it in K8S.

Our task is to create N memcaches instances, each of them needs to have its own kubernetes service and deployment. We cannot hide the memcache behind one service, because a memcached client has to know all the instances for fail-over and load-balancing.

Features:

• Generate k8s configuration files for memcached shards
• Memcached metrics exposed with a prometheus exporter

The opinionated parts:

• Use Makefile,
• Wrap kuberctl commands with Makefile tasks to enforce guards,
• A guard that checks whether the intended TARGET_ENV matches a kubernetes cluster, you are logged in,
• Use separate kubernetes clusters with postfix: development, staging, production (see guard_right_env in Makefile).

Howto

1. Generate kubernetes config files for your environment (in tmp/$TARGET_ENV directory):

   NUM_SHARDS=2 TARGET_ENV=staging make kubernetes_generate_yml
   

2. Create services:

   TARGET_ENV=staging make apply_service
   

3. Create deployment:

   TARGET_ENV=staging make apply_service