# Example sentinel.conf
# port <sentinel-port>
# The port that this sentinel instance will run on
port 26379
#指定sentinel使用的端口，不能与redis-server运行实例的端口冲突
# sentinel announce-ip <ip>
# sentinel announce-port <port>
#
# The above two configuration directives are useful in environments where,
# because of NAT, Sentinel is reachable from outside via a non-local address.
#
# When announce-ip is provided, the Sentinel will claim the specified IP address
# in HELLO messages used to gossip its presence, instead of auto-detecting the
# local address as it usually does.
#
# Similarly when announce-port is provided and is valid and non-zero, Sentinel
# will announce the specified TCP port.
#
# The two options don’t need to be used together, if only announce-ip is
# provided, the Sentinel will announce the specified IP and the server port
# as specified by the “port” option. If only announce-port is provided, the
# Sentinel will announce the auto-detected local IP and the specified port.
#
# Example:
#
# sentinel announce-ip 1.2.3.4
# dir <working-directory>
# Every long running process should have a well-defined working directory.
# For Redis Sentinel to chdir to /tmp at startup is the simplest thing
# for the process to don’t interfere with administrative tasks such as
# unmounting filesystems.
dir “/tmp”
#Sentinel服务运行时使用的临时文件夹
# sentinel monitor <master-name> <ip> <redis-port> <quorum>
#
# Tells Sentinel to monitor this master, and to consider it in O_DOWN
# (Objectively Down) state only if at least <quorum> sentinels agree.
#
# Note that whatever is the ODOWN quorum, a Sentinel will require to
# be elected by the majority of the known Sentinels in order to
# start a failover, so no failover can be performed in minority.
#
# Slaves are auto-discovered, so you don’t need to specify slaves in
# any way. Sentinel itself will rewrite this configuration file adding
# the slaves using additional configuration options.
# Also note that the configuration file is rewritten when a
# slave is promoted to master.
#
# Note: master name should not include special characters or spaces.
# The valid charset is A-z 0-9 and the three characters “.-_”.
sentinel myid 6f3e5fcca471e4ea97e354338b651201eb6b1072
# sentinel auth-pass <master-name> <password>
#
# Set the password to use to authenticate with the master and slaves.
# Useful if there is a password set in the Redis instances to monitor.
#
# Note that the master password is also used for slaves, so it is not
# possible to set a different password in masters and slaves instances
# if you want to be able to monitor these instances with Sentinel.
#
# However you can have Redis instances without the authentication enabled
# mixed with Redis instances requiring the authentication (as long as the
# password set is the same for all the instances requiring the password) as
# the AUTH command will have no effect in Redis instances with authentication
# switched off.
#
# Example:
#
# sentinel auth-pass mymaster MySUPER–secret-0123passw0rd
# 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
# Down).
#
# Default is 30 seconds.
#sentinel down-after-milliseconds mymaster 5000
#表示如果5s内mymaster没响应，就认为SDOWN，默认为30000
sentinel monitor mymaster 192.168.80.129 6379 1
#显示监控master节点192.168.80.129，master节点使用端口6379，最后一个数字表示投票需要的”最少法定人数”，比如有10个sentinal哨兵都在监控某一个master节点，如果需要至少6个哨兵发现master挂掉后，才认为master真正down掉，那么这里就配置为6，最小配置1台master，1台slave，在二个机器上都启动sentinal的情况下，哨兵数只有2个，如果一台机器物理挂掉，只剩一个sentinal能发现该问题，所以这里配置成1，至于mymaster只是一个名字，可以随便起，但要保证后续配置相同的名称
# sentinel parallel-syncs <master-name> <numslaves>
#sentinel parallel-syncs mymaster 1
#表示如果master重新选出来后，其它slave节点能同时并行从新master同步缓存的台数有多少个，显然该值越大，所有slave节点完成同步切换的整体速度越快，但如果此时正好有人在访问这些slave，可能造成读取失败，影响面会更广。最保定的设置为1，只同一时间，只能有一台干这件事，这样其它slave还能继续服务，但是所有slave全部完成缓存更新同步的进程将变慢。
#
# 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 config-epoch mymaster 0
# sentinel failover-timeout <master-name> <milliseconds>
#sentinel failover-timeout mymaster 15000
#表示如果15秒后,mysater仍没活过来，则启动failover，从剩下的slave中选一个升级为master，默认为180000(3分钟)
#
# Specifies the failover timeout in milliseconds. It is used in many ways:
#
# – The time needed to re-start a failover after a previous failover was
# already tried against the same master by a given Sentinel, is two
# times the failover timeout.
#
# – The time needed for a slave replicating to a wrong master according
# to a Sentinel current configuration, to be forced to replicate
# with the right master, is exactly the failover timeout (counting since
# the moment a Sentinel detected the misconfiguration).
#
# – The time needed to cancel a failover that is already in progress but
# did not produced any configuration change (SLAVEOF NO ONE yet not
# acknowledged by the promoted slave).
#
# – The maximum time a failover in progress waits for all the slaves to be
# reconfigured as slaves of the new master. However even after this time
# the slaves will be reconfigured by the Sentinels anyway, but not with
# the exact parallel-syncs progression as specified.
#
# Default is 3 minutes.
sentinel leader-epoch mymaster 0
# SCRIPTS EXECUTION
#
# 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 exits with “1” the execution is retried later (up to a maximum
# number of times currently set to 10).
#
# If script exits 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>
#指定sentinel检测到该监控的redis实例指向的实例异常时，调用的报警脚本。该配置项可选，但是很常用
#
# Call the specified notification script for any sentinel 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 master changed because of a failover 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 following arguments are passed to the script:
#
# <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
#
# <state> is currently always “failover”
# <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).
# This script should be resistant to multiple invocations.
#
# Example:
#
# sentinel client-reconfig-script mymaster /var/redis/reconfig.sh
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 127.0.0.1 6380
sentinel current-epoch 0