A brief introduction to etcd

Original link: http://www.nosuchfield.com/2022/06/14/A-brief-introduction-to-etcd/

Install

etcd is a distributed consistent key-value database. First we download the package

 useradd etcdsu - etcdwget https://github.com/etcd-io/etcd/releases/download/v3.5.4/etcd-v3.5.4-linux-amd64.tar.gztar -zxvf.tar.gzcd

After that we can query the version of etcd

 $ ./etcd --versionetcd Version: 3.5.4Git SHA: 08407ff76Go Version: go1.16.15Go OS/Arch: linux/amd64

We performed the above operations on the three loads 172.19.33.141 , 172.19.32.155 and 172.19.34.21 respectively to install etcd.

use

After that, we use etcd to build a cluster, and the relevant configuration can be set using the command line or the configuration file . The meaning of the relevant configuration is as follows

configure meaning Defaults
name the name of the current node default
initial-advertise-peer-urls Tell other nodes the ip address and port that the current node communicates with other nodes http://localhost:2380
advertise-client-urls Tell other nodes the ip address and port that the current node communicates with the client http://localhost:2379
listen-peer-urls The ip address and port that the current node is listening on and is used to communicate with other nodes http://localhost:2380
listen-client-urls The ip address and port that the current node is listening on and used to communicate with the client http://localhost:2379
initial-cluster-token Token attribute when cluster bootstrap etcd-cluster
initial-cluster Configuration information for cluster bootstrap default= http://localhost:2380
initial-cluster-state Cluster startup status, set to new when the cluster is started for the first time, and set to existing if you want to join an existing cluster new

Then we use the command line settings to start the three processes separately

 [[email protected]]$ ./etcd --name node1 \ --initial-advertise-peer-urls http://172.19.33.141:2380 \ --advertise-client-urls http://172.19.33.141:2379 \ --listen-peer-urls http://172.19.33.141:2380 \ --listen-client-urls http://172.19.33.141:2379,http://127.0.0.1:2379 \ --initial-cluster-token product-center \ --initial-cluster node1=http://172.19.33.141:2380,node2=http://172.19.32.155:2380,node3=http://172.19.34.21:2380[[email protected]]$ ./etcd --name node2 \ --initial-advertise-peer-urls http://172.19.32.155:2380 \ --advertise-client-urls http://172.19.32.155:2379 \ --listen-peer-urls http://172.19.32.155:2380 \ --listen-client-urls http://172.19.32.155:2379,http://127.0.0.1:2379 \ --initial-cluster-token product-center \ --initial-cluster node1=http://172.19.33.141:2380,node2=http://172.19.32.155:2380,node3=http://172.19.34.21:2380[[email protected]]$ ./etcd --name node3 \ --initial-advertise-peer-urls http://172.19.34.21:2380 \ --advertise-client-urls http://172.19.34.21:2379 \ --listen-peer-urls http://172.19.34.21:2380 \ --listen-client-urls http://172.19.34.21:2379,http://127.0.0.1:2379 \ --initial-cluster-token product-center \ --initial-cluster node1=http://172.19.33.141:2380,node2=http://172.19.32.155:2380,node3=http://172.19.34.21:2380

After the etcd startup command is executed on the three loads, the three nodes have formed an etcd cluster under normal circumstances. Then we can use etcdctl client to read and write data in the cluster

 ./etcdctl --endpoints=172.19.33.141:2379,172.19.32.155:2379,172.19.34.21:2379 member list./etcdctl --endpoints=172.19.33.141:2379,172.19.32.155:2379,172.19.34.21:2379 put name "zhangsan"./etcdctl --endpoints=172.19.33.141:2379,172.19.32.155:2379,172.19.34.21:2379 get name

refer to

https://etcd.io/docs/v3.5/tutorials/

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