# 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.
#
# 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
# 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
# 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
+
+
projects / redis.git / blobdiff