How to increase the available number of file descriptors for Horizon/httpd?

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  • How to increase the number of file descriptors for Horizon?
  • I get the following error when using Horizon:

    2016-10-12 21:34:41,645 20461 ERROR openstack_auth.backend SSL exception connecting to https://x.x.x.x:13000/v2.0/tokens: [Errno 24] Too many open files


  • Red Hat OpenStack Platform 7
  • Red Hat OpenStack Platform 8

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