/lib/systemd/system/open-iscsi.service is in open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=Login to default iSCSI targets
Documentation=man:iscsiadm(8) man:iscsid(8)
Wants=network-online.target remote-fs-pre.target iscsid.service
After=network-online.target iscsid.service
Before=remote-fs-pre.target
DefaultDependencies=no
Conflicts=shutdown.target
Before=shutdown.target
[Service]
Type=oneshot
RemainAfterExit=true
# iscsiadm --login will return 21 if no nodes are configured,
# and 15 if a session is alread logged in (which we do not
# consider an error)
SuccessExitStatus=15 21
# iscsiadm will only work if iscsid is running. But we can't use a
# Requires= dependency, since restarts of iscsid would then be
# propagated to this service - and that would cause all sorts of
# mayhem. Therefore, check it in ExecStartPre.
ExecStartPre=/bin/systemctl --quiet is-active iscsid.service
ExecStart=/sbin/iscsiadm -m node --loginall=automatic
ExecStart=/lib/open-iscsi/activate-storage.sh
ExecStop=/lib/open-iscsi/umountiscsi.sh
ExecStop=/bin/sync
ExecStop=/lib/open-iscsi/logout-all.sh
[Install]
WantedBy=sysinit.target
Alias=iscsi.service
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