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

[ Christian Ehrhardt ]

Trying a hacky POC:

1. define iscsid.socket
$ cat > /lib/systemd/system/iscsid.socket << EOF
[Unit]
Description=Open-iSCSI iscsid Socket
Documentation=man:iscsid(8) man:iscsiadm(8)

[Socket]
ListenStream=@ISCSIADM_ABSTRACT_NAMESPACE

[Install]
WantedBy=sockets.target
EOF
$ systemctl enable iscsid.socket

2. remove some entries in /lib/systemd/system/open-iscsi.service
- remove iscsid from Wants=
- Remove the line ExecStartPre=/bin/systemctl --quiet is-active iscsid.service

3. disable and reload all files
$ systemctl disable iscsid
$ systemctl daemon-reload

Note: we also have still /etc/init.d/iscsid, but as long as there is a
.service it doesn't matter.

=> ok - with that on a restart it doesn't start anymore on Ubuntu

Lets see if it will auto-start ...

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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:
  Triaged
Status in open-iscsi source package in Bionic:
  Triaged

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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