ENVIRONMENT
REDIS version = redis-6.0.6-1
REDIS nodes = 3
REDIS OS = linux 7
I have three machines. All three machines have redis and sentinel installed. redis and sentinel services are running.(via systemctl status redis and systemctl status redis-sentinel). I check the replication and its also working fine
When I reboot the master node. The Master role is not getting transferred. I noticed that redis-sentinel.conf file is not getting updated in the end of file. Below is for reference
# SENTINEL rename-command mymaster CONFIG CONFIG
# Generated by CONFIG REWRITE
protected-mode no
supervised systemd
user default on nopass ~ +@all*
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel current-epoch 0
[root@PostgreSQL-Node01 ~]# cat /etc/redis-sentinel.conf |grep -v “^#”
port 26379
daemonize no
pidfile “/var/run/redis-sentinel.pid”
logfile “/var/log/redis/sentinel.log”
dir “/tmp”
sentinel myid fc901810aaf4b6ec647fa02401ba3316b6edd357
sentinel deny-scripts-reconfig yes
sentinel monitor mymaster 192.168.4.176 8999 2
sentinel down-after-milliseconds mymaster 3000
sentinel failover-timeout mymaster 5000
protected-mode no
supervised systemd
user default on nopass ~* +@all
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel current-epoch 0
[root@PostgreSQL-Node01 ~]#
[root@PostgreSQL-Node02 ~]# cat /etc/redis-sentinel.conf |grep -v “^#”
port 26379
daemonize no
pidfile “/var/run/redis-sentinel.pid”
logfile “/var/log/redis/sentinel.log”
dir “/tmp”
sentinel myid d28212c21b36a3e53cb45421f3bb585352f62785
sentinel deny-scripts-reconfig yes
sentinel monitor mymaster 127.0.0.1 8999 2
sentinel down-after-milliseconds mymaster 3000
sentinel failover-timeout mymaster 5000
protected-mode no
supervised systemd
user default on nopass ~* +@all
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel current-epoch 0
[root@PostgreSQL-Node02 ~]#
[root@PostgreSQL-Node03 ~]# cat /etc/redis-sentinel.conf |grep -v “^#”
port 26379
daemonize no
pidfile “/var/run/redis-sentinel.pid”
logfile “/var/log/redis/sentinel.log”
dir “/tmp”
sentinel myid 48a055cc1d0cd4944f391074a16215f448fd33d6
sentinel deny-scripts-reconfig yes
sentinel monitor mymaster 192.168.4.176 8999 2
sentinel down-after-milliseconds mymaster 3000
sentinel failover-timeout mymaster 5000
protected-mode no
supervised systemd
user default on nopass ~* +@all
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel current-epoch 0
[root@PostgreSQL-Node03 ~]#
cat /var/log/redis/sentinel.log
995:X 21 Aug 2023 19:22:04.765 * Running mode=sentinel, port=26379.
995:X 21 Aug 2023 19:22:04.767 # Sentinel ID is d28212c21b36a3e53cb45421f3bb585352f62785
995:X 21 Aug 2023 19:22:04.767 # +monitor master mymaster 127.0.0.1 8999 quorum 2
995:X 21 Aug 2023 19:22:07.807 # +sdown master mymaster 127.0.0.1 8999
995:X 21 Aug 2023 19:53:36.391 # +set master mymaster 127.0.0.1 8999 down-after-milliseconds 3000
995:X 21 Aug 2023 19:53:58.189 # +set master mymaster 127.0.0.1 8999 down-after-milliseconds 3000
995:X 21 Aug 2023 19:54:16.871 # +set master mymaster 127.0.0.1 8999 failover-timeout 5000
995:X 21 Aug 2023 19:54:34.056 # +set master mymaster 127.0.0.1 8999 quorum 2
995:X 21 Aug 2023 19:55:27.150 # User requested shutdown…
995:X 21 Aug 2023 19:55:27.150 * Removing the pid file.
995:X 21 Aug 2023 19:55:27.150 # Sentinel is now ready to exit, bye bye…
1005:X 21 Aug 2023 19:55:42.949 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1005:X 21 Aug 2023 19:55:42.950 # Redis version=6.0.6, bits=64, commit=00000000, modified=0, pid=1005, just started
1005:X 21 Aug 2023 19:55:42.950 # Configuration loaded
1005:X 21 Aug 2023 19:55:42.950 # WARNING supervised by systemd - you MUST set appropriate values for TimeoutStartSec and TimeoutStopSec in your service unit.
1005:X 21 Aug 2023 19:55:42.959 * Running mode=sentinel, port=26379.
1005:X 21 Aug 2023 19:55:42.959 # Sentinel ID is d28212c21b36a3e53cb45421f3bb585352f62785
1005:X 21 Aug 2023 19:55:42.959 # +monitor master mymaster 127.0.0.1 8999 quorum 2
1005:X 21 Aug 2023 19:55:46.007 # +sdown master mymaster 127.0.0.1 8999
[root@PostgreSQL-Node02 ~]#