First implementation of Redis Sentinel.

This commit implements the first, beta quality implementation of Redis
Sentinel, a distributed monitoring system for Redis with notification
and automatic failover capabilities.

More info at http://redis.io/topics/sentinel

1 files changed, 41 insertions, 0 deletions

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+# Example sentienl.conf
+
+# sentinel monitor <name> <ip> <port> quorum. Tells Sentinel to monitor this
+# slave, and to consider it in O_DOWN (Objectively Down) state only if at
+# least two sentinels agree.
+#
+# Note: master name should not include special characters or spaces.
+# The valid charset is A-z 0-9 and the three characters ".-_".
+sentinel monitor mymaster 127.0.0.1 6379 2
+
+# Number of milliseconds the master (or any attached slave or sentinel) should
+# be unreachable (as in, not acceptable reply to PING, continuously, for the
+# specified period) in order to consider it in S_DOWN state (Subjectively
+# Down).
+#
+# Default is 30 seconds.
+sentinel down-after-milliseconds mymaster 30000
+
+# Specify if this Sentinel can start the failover for this master.
+sentinel can-failover mymaster yes
+
+# How many slaves we can reconfigure to point to the new slave simultaneously
+# during the failover. Use a low number if you use the slaves to serve query
+# to avoid that all the slaves will be unreachable at about the same
+# time while performing the synchronization with the master.
+sentinel parallel-syncs mymaster 1
+
+# Specifies the failover timeout in milliseconds. When this time has elapsed
+# without any progress in the failover process, it is considered concluded by
+# the sentinel even if not all the attached slaves were correctly configured
+# to replicate with the new master (however a "best effort" SLAVEOF command
+# is sent to all the slaves before).
+#
+# Also when 25% of this time has elapsed without any advancement, and there
+# is a leader switch (the sentinel did not started the failover but is now
+# elected as leader), the sentinel will continue the failover doing a
+# "takeover".
+#
+# Default is 15 minutes.
+sentinel failover-timeout mymaster 900000
+