Postgres高可用集群：yoke

Postgres的高可用集群，具有自動切換和自動集群恢復。Postgres冗余/自動故障轉移解決方案，提供一個高可用PostgreSQL集群的簡單管理。

Requirements

Yoke has the following requirements/dependencies to run:

• A 3-server cluster consisting of a 'primary', 'secondary', and 'monitor' node
• 'primary' & 'secondary' nodes need ssh connections between each other (w/o passwords)
• 'primary' & 'secondary' nodes need rsync (or some alternative sync_command) installed
• 'primary' & 'secondary' nodes should have postgres installed under a postgres user, and in thepath. Yoke tries calling 'postgres' and 'pg_ctl'
• 'primary' & 'secondary' nodes run postgres as a child process so it should not be started independently

Each node in the cluster requires its own config.ini file with the following options (provided values are defaults):

[config]
# the IP which this node will broadcast to other nodes
advertise_ip=
# the port which this node will broadcast to other nodes
advertise_port=4400
# the directory where postgresql was installed
data_dir=/data
# delay before node dicides what to do with postgresql instance
decision_timeout=30
# log verbosity (trace, debug, info, warn error, fatal)
log_level=warn
# REQUIRED - the IP:port combination of all nodes that are to be in the cluster (e.g. 'role=m.y.i.p:4400')
primary=
secondary=
monitor=
# SmartOS REQUIRED - either 'primary', 'secondary', or 'monitor' (the cluster needs exactly one of each)
role=
# the postgresql port
pg_port=5432
# the directory where node status information is stored
status_dir=./status
# the command you would like to use to sync the data from this node to the other when this node is master
sync_command=rsync -ae "ssh -o StrictHostKeyChecking=no" --delete {{local_dir}} {{slave_ip}}:{{slave_dir}}

[vip]
# Virtual Ip you would like to use
ip=
# Command to use when adding the vip. This will be called as {{add_command}} {{vip}}
add_command=
# Command to use when removing the vip. This will be called as {{remove_command}} {{vip}}
remove_command=

[role_change]
# When this nodes role changes we will call the command with the new role as its arguement '{{command}} {{(master|slave|single}))'
command=

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