go-keepAlive

go-keepAlive is HA tool witch checks services health on multiple services nodes and updates zookeeper node defined for specific service with healthy services nodes.

Quick start

• create app configuration file, config.yml, like bellow:

---
services:
        - name: test_service
          nodes:
                - ip: 172.217.16.99
                  port: 80
                - ip: 172.217.16.110
                  port: 80

• start app in bootstrap mode: go_keepAlive -bootstrap
  App connects to zookeeper(s) defined with -zk flag or localhost by default, and creates zk nodes structure as defined in configuration file.

• start app node on multiple servers: go_keepalive
  App does not need configuration, it reads it from zookeeper. Also, it auto detects if it should start in master or agent mode: if there is no master, it will start in master mode; otherwise, it will start in agent mode.
  It also requires -zk flag if zookeeper is not on localhost.

• read contents of service node, representing healthy nodes:

[zk: localhost:2181(CONNECTED) 17] get /go-keepAlive/services/test_service
172.217.16.99 172.217.16.110
cZxid = 0xf3d6
ctime = Tue Nov 07 15:31:52 UTC 2017
mZxid = 0xf3eb
mtime = Thu Nov 09 11:12:00 UTC 2017
pZxid = 0xf3d9
cversion = 2
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 28
numChildren = 2

Notes

The project is still in early alpha release, lacking a lot of features, and with potential bugs.