Unable to setup etcd server | tls: bad certificate

piyush22 · October 14, 2025, 11:31am

i am trying to setup this clusted in linode cloud and was trying to follow up this note

mmumshad/kubernetes-the-hard-way/blob/master/docs/07-bootstrapping-etcd.md

# Bootstrapping the etcd Cluster

Kubernetes components are stateless and store cluster state in [etcd](https://etcd.io/). In this lab you will bootstrap a two node etcd cluster and configure it for high availability and secure remote access.

If you examine the command line arguments passed to etcd in its unit file, you should recognise some of the certificates and keys created in earlier sections of this course.

## Prerequisites

The commands in this lab must be run on each controller instance: `controlplane01`, and `controlplane02`. Login to each of these using an SSH terminal.

### Running commands in parallel with tmux

[tmux](https://github.com/tmux/tmux/wiki) can be used to run commands on multiple compute instances at the same time.

## Bootstrapping an etcd Cluster Member

### Download and Install the etcd Binaries

Download the official etcd release binaries from the [etcd](https://github.com/etcd-io/etcd) GitHub project:

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however my etcd server are unable to communicate with each other

reciving below error
{“level”:“warn”,“ts”:“2025-10-14T10:46:23.344946Z”,“caller”:“embed/config_logging.go:169”,“msg”:“rejected connection”,“remote-addr”:“10.200.0.6:36870”,“server-name”:“”,“error”:“remote error: tls: bad certificate”}
{“level”:“warn”,“ts”:“2025-10-14T10:46:23.34653Z”,“caller”:“embed/config_logging.go:169”,“msg”:“rejected connection”,“remote-addr”:“10.200.0.6:36882”,“server-name”:“”,“error”:“remote error: tls: bad certificate”}

rob_kodekloud · October 14, 2025, 7:45pm

I don’t really know much how Linode virtuals are networked; this is a question you probably need to ask Linode support.