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

[Steve Langasek]

Public bug reported:

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.

** Affects: open-iscsi (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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.

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