k8s.github.io

ETCD for Beginners

• Take me to the Video Tutorial

In this section, we will take a quick look at introduction to ETCD for beginners.

• What is ETCD?
• What is a Key-Value Store?
• How to get started quickly with ETCD?
• How to operate ETCD?

## What is a ETCD? - ETCD is a distributed reliable key-value store that is simple, secure & Fast.

What is a Key-Value Store

• Traditionally, databases have been in tabular format, you must have heard about SQL or Relational databases. They store data in rows and columns

  

• A Key-Value Store stores information in a Key and Value format.

  

Install ETCD

• It’s easy to install and get started with ETCD.

  • Download the relevant binary for your operating system from github releases page (https://github.com/etcd-io/etcd/releases)

    For Example: To download ETCD v3.5.6, run the below curl command

    $ curl -LO https://github.com/etcd-io/etcd/releases/download/v3.5.6/etcd-v3.5.6-linux-amd64.tar.gz
    

  • Extract it.

    $ tar xvzf etcd-v3.5.6-linux-amd64.tar.gz
    

  • Run the ETCD Service

    $ ./etcd
    

  • When you start ETCD it will by default listen on port 2379
  • The default client that comes with ETCD is the etcdctl client. You can use it to store and retrieve key-value pairs.

    Syntax: To Store a Key-Value pair
    $ ./etcdctl put key1 value1
    

    Syntax: To retrieve the stored data
    $ ./etcdctl get key1
    

    Syntax: To view more commands. Run etcdctl without any arguments
    $ ./etcdctl
    

    

  K8s Reference Docs:

  • https://kubernetes.io/docs/concepts/overview/components/
  • https://etcd.io/docs/
  • https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/