[Bug 1838109] Re: civetweb does not allow tuning of maximum socket connections

[Edward Hope-Morley]

Presumably we will need a way for the charm to apply this setting if
needs be so adding charm-ceph-radosgw.

** Also affects: charm-ceph-radosgw
   Importance: Undecided
       Status: New

** Changed in: charm-ceph-radosgw
   Importance: Undecided => Medium

** Changed in: charm-ceph-radosgw
    Milestone: None => 20.01

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https://bugs.launchpad.net/bugs/1838109

Title:
  civetweb does not allow tuning of maximum socket connections

Status in Ceph:
  New
Status in OpenStack ceph-radosgw charm:
  New
Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive queens series:
  Fix Committed
Status in Ubuntu Cloud Archive rocky series:
  Fix Released
Status in Ubuntu Cloud Archive stein series:
  Fix Released
Status in Ubuntu Cloud Archive train series:
  Fix Committed
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Fix Released
Status in ceph source package in Disco:
  Fix Released
Status in ceph source package in Eoan:
  Fix Released

Bug description:
  [Impact]
  RADOS gateway can run out of sockets prior to consuming the CPU and memory resources on the server on which it is running.

  [Test Case]
  Deploy RGW to a large server; scale test - RGW processes will only be able to service around 100 open connections.

  [Regression Potential]
  Medium; the fix introduces a new configuration option for civetweb (the web connector for RGW) to allow the max connections to be set via configuration, rather than being set during compilation; improvement has been accepted upstream in the civetweb project.

  [Original Bug Report]
  Civetweb does not offer an option for configuring the maximum number of sockets available. Some users run out of sockets and are left with no workaround.

  This patch adds a new user-configurable parameter, "max_connections".

  See:
  https://github.com/civetweb/civetweb/issues/775

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