[Bug 1755858] Re: iscsid autostarts on all servers when it has nothing to do

[ Christian Ehrhardt ]

Also reported to Debian and linked up their bug.
It should help them just as much.

And if they accept it maintenance/merges will be easier, while OTOH if
they find issues we can fix them in our Delta - so either way it is good
to make it known there.

** Bug watch added: Debian Bug tracker #900397
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900397

** Also affects: open-iscsi (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900397
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1755858

Title:
  iscsid autostarts on all servers when it has nothing to do

Status in open-iscsi package in Ubuntu:
  Fix Committed
Status in open-iscsi source package in Bionic:
  Triaged
Status in open-iscsi package in Debian:
  Unknown

Bug description:
  In bionic, the open-iscsi systemd unit has the following guards to
  keep it from running on systems with no iscsi targets configured:

  # Must have some pre-defined targets to login to
  ConditionDirectoryNotEmpty=|/etc/iscsi/nodes
  # or have a session to use via iscsid
  ConditionDirectoryNotEmpty=|/sys/class/iscsi_session

  However, iscsid starts from a separate unit and does not include this
  check.  Thus, iscsid starts on every Ubuntu Server install, whether or
  not it has anything to do.

  We should replicate these unit conditionals to the iscsid unit, to
  ensure the daemon doesn't run (consuming memory, and slowing boot)
  when not needed.

  Related bugs:
   * bug 1630946: ubuntu-server depends on open-iscsi and runs iscsid

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