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Examples

The up script starts example services. The services are r1-r6 (Redis instances), s1-s6 (Sentinel instances), and haproxy, an haproxy instance in front of the 6 redis instances.

$ ./up all
Starting r1
Starting s1
Starting r2
Starting s2
Starting r3
Starting s3
Starting r4
Starting s4
Starting r5
Starting s5
Starting r6
Starting s6
Starting haproxy
$ ./status
Redis 6661: slave  127.0.0.1 6664
Redis 6662: slave  127.0.0.1 6664
Redis 6663: slave  127.0.0.1 6664
Redis 6664: master
Redis 6665: slave  127.0.0.1 6664
Redis 6666: slave  127.0.0.1 6664
sentinel 7661
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7662
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7663
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7664
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7665
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7666
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664

The down script stops the services that up starts. These can be one at a time, or all at once.

$ ./down r4
$ ./status
Redis 6661: slave  127.0.0.1 6664
Redis 6662: master
Redis 6663: slave  127.0.0.1 6664
Redis 6664: offline
Redis 6665: slave  127.0.0.1 6664
Redis 6666: slave  127.0.0.1 6664
sentinel 7661
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7662
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7663
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7664
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7665
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664
sentinel 7666
  master: 127.0.0.1 6664
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6664
    127.0.0.1:6662 -> 127.0.0.1:6664
    127.0.0.1:6663 -> 127.0.0.1:6664
    127.0.0.1:6665 -> 127.0.0.1:6664
    127.0.0.1:6666 -> 127.0.0.1:6664

Then wait for the sentinels to catch up, and run status again.

$./status
Redis 6661: slave  127.0.0.1 6662
Redis 6662: master
Redis 6663: slave  127.0.0.1 6662
Redis 6664: offline
Redis 6665: slave  127.0.0.1 6662
Redis 6666: slave  127.0.0.1 6662
sentinel 7661
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662
sentinel 7662
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662
sentinel 7663
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662
sentinel 7664
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662
sentinel 7665
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662
sentinel 7666
  master: 127.0.0.1 6662
  slaves: 
    127.0.0.1:6661 -> 127.0.0.1:6662
    127.0.0.1:6663 -> 127.0.0.1:6662
    127.0.0.1:6664 -> ?:0
    127.0.0.1:6665 -> 127.0.0.1:6662
    127.0.0.1:6666 -> 127.0.0.1:6662

After this, the original docs follow.

Redis HA - sentinel + haproxy

  • sentinel: autoswitch master/slave
  • haproxy: active check for only master node
  • haproxy api: disable failed nodes to prevent multimaster

"diagram"

without haproxy maintenance mode

  A is master, B is slave
  A crashes, sentinel convert B to master
  A is recovered (still master)
  haproxy balancing between A and B, until sentinel convert A to slave
  data written to A are lost

witch haproxy maintenance mode via notification script

  A is master, B is slave
  A crashes, sentinel convert B to master
  haproxy disable A
  A is recovered (still master) but disabled in haproxy
  haproxy points only to B

Run redis cluster

redis-server --port 6666
redis-server --port 6667
redis-server --port 6668

Set slaves

redis-cli -p 6667 SLAVEOF 127.0.0.1 6666
redis-cli -p 6668 SLAVEOF 127.0.0.1 6666

Run sentinel

redis-server sentinel.conf  --sentinel

Run haproxy

haproxy -f haproxy.cfg -db

Open http://localhost:8080/ and try kill some redis

Notice

tested on

  • redis 2.8.6
  • haproxy 1.5-dev21

[!] in production on single host you must specify different data dir before SLAVEOF command otherwise you loose data on master

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