get/set key-value
etcdctl get/set /key-path
查看所有key-value
curl -s http://127.0.0.1:2479/v2/keys/?recursive=true
查看指定key-value
curl -s http://127.0.0.1:2479/v2/keys/services/default/tenantmanager
原文：https://www.cnblogs.com/wenlin-gk/p/9522176.html