Double-tap Enhanced version of etcdhelper

This is a modified version of etcdhelper from OpenShift and a subsequent modifications made by Flant.

One new function in this release: changeStorageClassNFSServer

This repo has a new functionality described in the article:

• «**Hacking Kubernetes etcd for (personal) profit **».

For the original Flant team article see:

• «**How to modify etcd data of your Kubernetes directly (without K8s API) **».

In short, it is designed to change the PV NFS Sever coordinates when using https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner

Using etcdhelper

Build

The fastest way is to use official golang image:

docker run --rm -v $(pwd):/app -w /app -e CGO_ENABLED=0 -e GOOS=linux golang:1.15-alpine go build etcdhelper.go

etcdhelper binary will be created in the current directory. Use GOOS=darwin to build MacOS executable.

Using

Change NFS Server IP/DNS for a given StorageClass

./etcdhelper -cacert /etc/kubernetes/pki/etcd/ca.crt -cert /etc/kubernetes/pki/etcd/server.crt -key /etc/kubernetes/pki/etcd/server.key -endpoint https://127.0.0.1:2379 change-storage-class-nfs-server <StorageClassName> <new IP/DNS>

Status

This Double-tap enhanced version of etcdhelper is PoC (proof of concept). Use it on your own risk. Before making any changes please make sure you BACKUP your etcd server.