redis-rb: Redis::CannotConnectError: No sentinels available.

Hello, I’m trying to setup sentinels, but i get error Redis::CannotConnectError: No sentinels available:

> redis = Redis.new(url: "redis://master.redis.com:6379/0", sentinels: [{host: "127.0.0.1", port: 26379}], master_name: :master)
> redis.zcount(1,0,'+inf')

Error:

Redis::CannotConnectError: No sentinels available.
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:551:in `sentinel_detect'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:555:in `resolve_master'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:519:in `resolve'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:317:in `establish_connection'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:94:in `block in connect'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:279:in `with_reconnect'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:93:in `connect'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:350:in `ensure_connected'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:207:in `block in process'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:292:in `logging'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:206:in `process'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis/client.rb:112:in `call'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic-redis-2.0.2/lib/newrelic_redis/instrumentation.rb:36:in `block in call_with_newrelic_trace'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic_rpm-3.12.0.288/lib/new_relic/agent/datastores.rb:111:in `block in wrap'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic_rpm-3.12.0.288/lib/new_relic/agent/method_tracer.rb:69:in `block in trace_execution_scoped'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic_rpm-3.12.0.288/lib/new_relic/agent/method_tracer_helpers.rb:82:in `trace_execution_scoped'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic_rpm-3.12.0.288/lib/new_relic/agent/method_tracer.rb:67:in `trace_execution_scoped'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic_rpm-3.12.0.288/lib/new_relic/agent/datastores.rb:108:in `wrap'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/newrelic-redis-2.0.2/lib/newrelic_redis/instrumentation.rb:35:in `call_with_newrelic_trace'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis.rb:1769:in `block in zcount'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis.rb:37:in `block in synchronize'
  from /opt/rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis.rb:37:in `synchronize'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/redis-3.2.1/lib/redis.rb:1768:in `zcount'
  from (irb):66
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/railties-4.1.10/lib/rails/commands/console.rb:90:in `start'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/railties-4.1.10/lib/rails/commands/console.rb:9:in `start'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/railties-4.1.10/lib/rails/commands/commands_tasks.rb:69:in `console'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/railties-4.1.10/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
  from /home/rails/project/shared/bundle/ruby/2.2.0/gems/railties-4.1.10/lib/rails/commands.rb:17:in `<top (required)>'
  from ./bin/rails:8:in `require'
  from ./bin/rails:8:in `<main>'irb(main):067:0>

But sentinel exists:

# redis-cli -p 26379
127.0.0.1:26379> info
# Server
redis_version:3.0.1
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:8114b371efa78b51
redis_mode:sentinel
os:Linux 3.13.0-24-generic x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:4.8.2
process_id:1130
run_id:2f09b36efcc4c99f94f5b9ed6d06ff52b61b78bb
tcp_port:26379
uptime_in_seconds:3884
uptime_in_days:0
hz:12
lru_clock:6879962
config_file:/etc/redis/redis.conf

# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
master0:name=master,status=ok,address=10.0.0.1:6379,slaves=1,sentinels=1

About this issue

Original URL
State: closed
Created 9 years ago
Comments: 18 (5 by maintainers)

Links to this issue

Commits related to this issue

Add new master_name param for sentinel. Fixes #531 — committed to BookOfGreg/redis-rb by BookOfGreg 8 years ago
Merge #640 #701 640: Add new master_name param for sentinel. Fixes #531 r=badboy Associated with issue #531. Based on #534 with the addition of tests. Didn't know how to keep @nguyenductung 's commi... — committed to redis/redis-rb by not-a-robot[bot] 7 years ago

Most upvoted comments

This is super confusing but here is what you need to do:

The Redis URL has to be defined as: redis://:<your-redis-password>@<master-name>/ and the list of sentinels.

@cobyrne09 So for your context, it will be something like:

Sidekiq.configure_client do |config|
  config.redis = { 
    url: 'redis://:yourpassword@util-master/',
    sentinels: redis_config['sentinels'].map { |sentinel|
      { :host => sentinel, :port => 26379 }
    },
  }
end

brodock on Nov 29, 2016

Thank so much @brodock! I do not have a redis password, so this is the syntax I got it to work with. I am not sure if the ‘master_name’ is necessary. Hopefully this helps someone else:

Sidekiq.configure_client do |config|
  config.redis = { 
    url: "redis://util-master/",
    master_name: :master,
    sentinels: redis_config['sentinels'].map { |sentinel|
      { :host => sentinel, :port => 26379 }
    }
  }
end

colin-byrne-1 on Nov 29, 2016

why is this issue is closed? problem still not fixed

brodock on Aug 18, 2016