Sentinels Down

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Olivier Picart

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Sep 20, 2016, 11:13:40 AM9/20/16
to Redis DB
for better performances, 
we try to use Redis with Nuxeo , but some difficulties to configure.

our infra. is 
 - 1 redis master : 10.12.12.133
 - 2 redis slave (replication) : 10.12.12.134, 10.12.12.135
 - 3 sentinels (one by server redis) for high disponibility of Redis. 

can you help us ?

The 3 redis are correctly installed and replication ok : 
{code}
# Replication
role:master
connected_slaves:2
slave0:ip=10.12.12.134,port=6379,state=online,offset=77601869,lag=0
slave1:ip=10.12.12.135,port=6379,state=online,offset=77601869,lag=0
master_repl_offset:77601869
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:76553294
repl_backlog_histlen:1048576
{code}


the config of sentinels :
{code}
    sentinel monitor master 10.12.12.133 6379 2
    sentinel failover-timeout master 180000
    sentinel parallel-syncs master 2
{code}

when sentinels started, we have a good config rewrite ? 
{code}
    # Generated by CONFIG REWRITE
    sentinel config-epoch master 0
    sentinel leader-epoch master 0
    sentinel known-slave master 10.12.12.134 6379
    sentinel known-slave master 10.12.12.135 6379
    sentinel known-sentinel master 10.12.12.133 26379 b337812f929ae7a9576e141cf5d7ee3b859fc24d
    sentinel known-sentinel master 10.12.12.135 26379 21e9f7266b26373309e257b5db9496316214a68a
    sentinel current-epoch 0
{code}

sentinels logs : 
{code}
23785:X 12 Sep 16:35:14.802 # Sentinel ID is 0b0fd530d140834379ace3fc0f30261ea052c357
23785:X 12 Sep 16:35:14.802 # +monitor master master 10.12.12.133 6379 quorum 2
23785:X 12 Sep 16:35:14.804 * +slave slave 10.12.12.134:6379 10.12.12.134 6379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:14.807 * +slave slave 10.12.12.135:6379 10.12.12.135 6379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:14.987 * +sentinel sentinel b337812f929ae7a9576e141cf5d7ee3b859fc24d 10.12.12.133 26379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:15.763 * +sentinel sentinel 21e9f7266b26373309e257b5db9496316214a68a 10.12.12.135 26379 @ master 10.12.12.133 6379
{code}

and a few minutes after, sentinels falls down ?
Log des sentinels: 
{code}
23785:X 12 Sep 16:35:44.815 # +sdown slave 10.12.12.135:6379 10.12.12.135 6379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:44.815 # +sdown slave 10.12.12.134:6379 10.12.12.134 6379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:44.914 - Accepted 10.12.12.135:55535
23785:X 12 Sep 16:35:45.012 # +sdown sentinel b337812f929ae7a9576e141cf5d7ee3b859fc24d 10.12.12.133 26379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:35:45.835 # +sdown sentinel 21e9f7266b26373309e257b5db9496316214a68a 10.12.12.135 26379 @ master 10.12.12.133 6379
23785:X 12 Sep 16:36:30.971 # +sdown master master 10.12.12.133 6379
{code}


Regards
Olivier


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