ETCD for Beginners

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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
```
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