I have been setting up sensu on CentOS7.2 for the first time following the official docs over and over however I have not been able to get it to work:

I cannot seem to connect to the API. Uchiwa gives the error:

Datacenter site1 returned:
Connection error. Is the Sensu API running?`

enter image description here

I have tried: curl -I http://localhost:4567/clients ...I do not get a response.

Here is /var/log/sensu/sensu-api.log http://pastebin.com/wHEHE0bH

I have been creating a script to make the setup repeatable. Please see my script below which shows my config: http://pastebin.com/QEt5Msku If you run the script on CentOS7 it should repeat this issue.


Issue in answer below. After following a non official guide that successfully installed sensu on a fresh VM, I compared the two setup steps and after a couple of builds on fresh VMs swapping out the steps bit by bit I figured out replacing the repo with one from a non official guide that pointed to a slightly different URL fixed my problem (repo for CentOS6 but it works on 7, it just installs a non current verson 0.20.3).

echo '[sensu]
enabled=1' > /etc/yum.repos.d/sensu.repo

The problem is that sensu 0.23 resolves localhost to an ipv6 address but redis is not listening to the ipv6 address. The solution is to change "host": "localhost" to "host": "". There is an issue on Sensus git page

For your information, you should have looked in the sesu-server logs too and posted them here.

  • I actually resolved this at 2AM but went to sleep before posting the answer on here. You are right! I spent so many hours on this as the official documentation looked straightforward until i finally created a new VM and just copy pasted the steps in a poorly made guide that installed using a different repo and installed a slightly older version of sensu. – ZZ9 Apr 8 '16 at 7:29

For anyone seeking more info, you can check out the Sensu issue related to this bug. The issue for me was a conflict between the default host resolution on my OS, and the default Redis config as installed from the repo. My solution was:

Update /etc/hosts to resolve localhost to instead of ::1.


Update redis.conf to bind to ::1 in addition to

If you're running an IPv6-capable host, the latter option is probably the way to go. Hope this helps!

  • What does it say? – Pierre.Vriens May 11 '16 at 19:45
  • It's better to include the bulk of the relevant details directly in your post/answer; link-only answers are considered very low quality, as links can change/go stale/dead over time. This would leave future readers without the actual answer. – Castaglia May 11 '16 at 22:13
  • The solution is included in my answer. This issue is already linked in my answer. – ZZ9 May 13 '16 at 11:31

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