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

[Jesse Williamson]

verification-done-bionic
verification-done-disco

Procedure:

* run: strings radosgw | grep max_connections
max_connections
max_connections value "%s" is invalid

run: sudo systemctl restart ceph-radosgw.target
...see no error in logs.
r 
* edit /etc/ceph/ceph.conf
change:
    rgw frontends = civetweb port=70
to:
    rgw frontends = civetweb port=70 max_connections=1099329233823823823823832823832832
...see error in logs.

...restart with value in range (say, 1000), no error message.

* in the code there is no codepath setting this value without using the
variable, internally: so seeing this behavior is evidence the feature is
present.

** Tags removed: verification-needed-bionic verification-needed-disco
** Tags added: verification-done-bionic verification-done-disco

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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 Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive queens series:
  In Progress
Status in Ubuntu Cloud Archive rocky series:
  Fix Committed
Status in Ubuntu Cloud Archive stein series:
  Fix Committed
Status in Ubuntu Cloud Archive train series:
  In Progress
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Fix Committed
Status in ceph source package in Disco:
  Fix Committed
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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