X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7c15dd15965e659f822d1620b006caba06d5e298..749aac72ad980bf08b04655634590b80e2fd014c:/sentinel.conf

diff --git a/sentinel.conf b/sentinel.conf
index ca291163..34d185c4 100644
--- a/sentinel.conf
+++ b/sentinel.conf
@@ -4,7 +4,8 @@
 # The port that this sentinel instance will run on
 port 26379
 
-# sentinel monitor <name> <ip> <redis-port> <quorum>
+# sentinel monitor <master-name> <ip> <redis-port> <quorum>
+#
 # Tells Sentinel to monitor this slave, and to consider it in O_DOWN
 # (Objectively Down) state only if at least <quorum> sentinels agree.
 #
@@ -12,7 +13,8 @@ port 26379
 # The valid charset is A-z 0-9 and the three characters ".-_".
 sentinel monitor mymaster 127.0.0.1 6379 2
 
-# sentinel down-after-milliseconds <mymaster> <milliseconds>
+# sentinel down-after-milliseconds <master-name> <milliseconds>
+#
 # 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
@@ -21,18 +23,21 @@ sentinel monitor mymaster 127.0.0.1 6379 2
 # Default is 30 seconds.
 sentinel down-after-milliseconds mymaster 30000
 
-# sentinel can-failover <mymaster> <yes|no>
+# sentinel can-failover <master-name> <yes|no>
+#
 # Specify if this Sentinel can start the failover for this master.
 sentinel can-failover mymaster yes
 
-# sentinel parallel-syncs <mymaster> <numslaves>
+# sentinel parallel-syncs <master-name> <numslaves>
+#
 # 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
 
-# sentinel failover-timeout <mymaster> <milliseconds>
+# sentinel failover-timeout <master-name> <milliseconds>
+#
 # 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
@@ -47,3 +52,80 @@ sentinel parallel-syncs mymaster 1
 # Default is 15 minutes.
 sentinel failover-timeout mymaster 900000
 
+# SCRIPTS EXECTION
+#
+# sentinel notification-script and sentinel reconfig-script are used in order
+# to configure scripts that are called to notify the system administrator
+# or to reconfigure clients after a failover. The scripts are executed
+# with the following rules for error handling:
+#
+# If script exists with "1" the execution is retried later (up to a maximum
+# number of times currently set to 10).
+#
+# If script exists with "2" (or an higher value) the script execution is
+# not retried.
+#
+# If script terminates because it receives a signal the behavior is the same
+# as exit code 1.
+#
+# A script has a maximum running time of 60 seconds. After this limit is
+# reached the script is terminated with a SIGKILL and the execution retried.
+
+# NOTIFICATION SCRIPT
+#
+# sentinel notification-script <master-name> <script-path>
+# 
+# Call the specified notification script for any sentienl event that is
+# generated in the WARNING level (for instance -sdown, -odown, and so forth).
+# This script should notify the system administrator via email, SMS, or any
+# other messaging system, that there is something wrong with the monitored
+# Redis systems.
+#
+# The script is called with just two arguments: the first is the event type
+# and the second the event description.
+#
+# The script must exist and be executable in order for sentinel to start if
+# this option is provided.
+#
+# Example:
+#
+# sentinel notification-script mymaster /var/redis/notify.sh
+
+# CLIENTS RECONFIGURATION SCRIPT
+#
+# sentinel client-reconfig-script <master-name> <script-path>
+#
+# When the failover starts, ends, or is aborted, a script can be called in
+# order to perform application-specific tasks to notify the clients that the
+# configuration has changed and the master is at a different address.
+# 
+# The script is called in the following cases:
+#
+# Failover started (a slave is already promoted)
+# Failover finished (all the additional slaves already reconfigured)
+# Failover aborted (in that case the script was previously called when the
+#                   failover started, and now gets called again with swapped
+#                   addresses).
+#
+# The following arguments are passed to the script:
+#
+# <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
+#
+# <state> is "start", "end" or "abort"
+# <role> is either "leader" or "observer"
+# 
+# The arguments from-ip, from-port, to-ip, to-port are used to communicate
+# the old address of the master and the new address of the elected slave
+# (now a master) in the case state is "start" or "end".
+#
+# For abort instead the "from" is the address of the promoted slave and
+# "to" is the address of the original master address, since the failover
+# was aborted.
+#
+# This script should be resistant to multiple invocations.
+#
+# Example:
+#
+# sentinel client-reconfig-script mymaster /var/redis/reconfig.sh
+
+