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Bug 1508030

Summary: Bump default value of fs.inotify.max_user_instances
Product: Red Hat OpenStack Reporter: Sai Sindhur Malleni <smalleni>
Component: openstack-tripleo-heat-templatesAssignee: Sai Sindhur Malleni <smalleni>
Status: CLOSED ERRATA QA Contact: Gurenko Alex <agurenko>
Severity: high Docs Contact:
Priority: high    
Version: 10.0 (Newton)CC: jack.ottofaro, jlibosva, mburns, mlopes, nsantos, racedoro, rhel-osp-director-maint, sauchter
Target Milestone: z7Keywords: Triaged, ZStream
Target Release: 10.0 (Newton)   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: scale_lab
Fixed In Version: openstack-tripleo-heat-templates-5.3.3-2.el7ost Doc Type: Enhancement
Doc Text:
This update increases the default value of `fs.inotify.max_user_instances` to 1024. This update also allows you to manage the value through a heat template, using `InotifyIntancesMax`.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2018-02-27 16:50:40 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Sai Sindhur Malleni 2017-10-31 17:36:58 UTC 
Description of problem:
each dnsmasq process opens an inotify match, so the default value of fs.inotify.max_user_instances which is 128 is easily hit when creating subnets at scale.

Version-Release number of selected component (if applicable):
10

How reproducible:
100%

Steps to Reproduce:
1. Create large number of subnets (>128)
2.
3.

Actual results:
Subnet creation fails after a while

Expected results:
Subnets should be created

Additional info:
Upstream Gerrit: https://review.openstack.org/#/c/509521/
Comment 2 Jakub Libosvar 2017-11-09 02:28:19 UTC 
Merged to upstream Newton, moving to POST.
Comment 5 Gurenko Alex 2018-02-06 10:27:09 UTC 
Verified on build 2018-02-02.1

[stack@undercloud-0 ~]$ rpm -q openstack-tripleo-heat-templates
openstack-tripleo-heat-templates-5.3.8-1.el7ost.noarch

[stack@undercloud-0 ~]$ cat $(locate kernel.yaml) | sed -n '25,28p'
  InotifyIntancesMax:
    default: 1024
    description: Configures sysctl fs.inotify.max_user_instances key
    type: number

[stack@undercloud-0 ~]$ cat $(locate kernel.yaml) | sed -n '65,67p'
          # set inotify value for neutron/dnsmasq scale
          fs.inotify.max_user_instances:
            value: {get_param: InotifyIntancesMax}
Comment 8 errata-xmlrpc 2018-02-27 16:50:40 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0364