Yoke是Postgres的高可用集群，具有自动切换和自动集群恢复。Postgres冗余/自动故障转移解决方案，提供一个高可用PostgreSQL集群的简单管理。
Yoke依赖：
包含'primary','secodary'和'moitor'三个节点的3-server集群
'primary'&'secodary'节点需要互相之间进行ssh连接(w/o密码)
'primary'&'secodary'节点需要远程同步安装(或者一些替代syc_commad)
'primary'&'secodary'节点应该有安装postgres，Yoke会尝试调用'postgres'和'pg_ctl'
'primary'&'secodary'节点作为一个子进程运行postgres
配置示例：
[cofig]# the IP which this ode will broadcast to other odesadvertise_ip=# the port which this ode will broadcast to other odesadvertise_port=4400# the directory where postgresql was istalleddata_dir=/data# delay before ode decides what to do with postgresql istacedecisio_timeout=30# log verbosity (trace, debug, ifo, war error, fatal)log_level=war# REQUIRED - the IP:port combiatio of all odes that are to be i the cluster (e.g. 'role=m.y.i.p:4400')primary=secodary=moitor=# SmartOS REQUIRED - either 'primary', 'secodary', or 'moitor' (the cluster eeds exactly oe of each)role=# the postgresql portpg_port=5432# the directory where ode status iformatio is storedstatus_dir=./status# the commad you would like to use to syc the data from this ode to the other whe this ode is mastersyc_commad=rsyc -ae "ssh -o StrictHostKeyCheckig=o" --delete {{local_dir}} {{slave_ip}}:{{slave_dir}}[vip]# Virtual Ip you would like to useip=# Commad to use whe addig the vip. This will be called as {{add_commad}} {{vip}}add_commad=# Commad to use whe removig the vip. This will be called as {{remove_commad}} {{vip}}remove_commad=[role_chage]# Whe this odes role chages we will call the commad with the ew role as its arguemet '{{commad}} {{(master|slave|sigle}))'commad=
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