etcd: A Reliable Distributed KV Store

• Pronounced et-cee-dee
• Persistent KV store
• Uses Raft protocol to maintain data consistency
• Developed in Go
• Popular Use case: Kubernetes, Consul

Installation (OSX)

• Step 1

  $ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
  

• Step 2

  $ brew install etcd
  

• Step 3

  $ which etcd
  /usr/local/bin/etcd
  

Start Server and Make Requests

• Step 4

  $ /usr/local/bin/etcd
  [WARNING] Deprecated '--logger=capnslog' flag is set; use '--logger=zap' flag instead
  2020-03-23 01:11:59.084231 I | etcdmain: etcd Version: 3.4.4
  2020-03-23 01:11:59.084520 I | etcdmain: Git SHA: Not provided (use ./build instead of go build)
  2020-03-23 01:11:59.084527 I | etcdmain: Go Version: go1.13.8
  2020-03-23 01:11:59.084529 I | etcdmain: Go OS/Arch: darwin/amd64
  

• Step 5

  $ etcdctl put mykey "this is a test"
  OK
  
  $ etcdctl get mykey 
  mykey
  this is a test
  

Reference

• https://rancher.com/blog/2019/2019-01-29-what-is-etcd/
• https://github.com/etcd-io/etcd
• https://www.compose.com/articles/essentially-etcd-part-2-coordination/

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