Kubernetes MongoDB

Deploy MongoDB replica set in Kubernetes

Prerequisites

You should disable THP ( transparent huge pages ). There is many ways to do that.

• Write a startup script using gcr.io/google-containers/startup-script
• Use busybox image and make DaemonSet to do this in all deployments.

This one is not a critical problem. gcr.io/google-containers/startup-scriptis 12.5MB, but since we are essentially just running a shell script, it can be changed to a slimmer image, like busybox which has an image size of 1.15MB.
busybox is lacking the startup functionality of gcr.io/google-containers/startup-script. For this we can utilize initContainers which were unavailable at the time.

Use this one

kubectl apply -f https://gist.githubusercontent.com/hatamiarash7/ae7fcc9c7155722df77ebbf459d467f5/raw/178d7bb870a266f86de2e881d795ebf57f6e6d77/daemon.yml

Install

kubectl apply -f replicaset.yml
kubectl apply -f services.yml

Usage

mongodb://localhost:27017/?readPreference=primary&ssl=false