Status of a clean install in a VM and/or Container, so testable rather
trivial:
$ systemctl status iscsid open-iscsi
● iscsid.service - iSCSI initiator daemon (iscsid)
Loaded: loaded (/lib/systemd/system/iscsid.service; enabled; vendor preset:
enabled)
Active: active (running) since Wed 2018-05-23 10:52:11 UTC; 7min ago
Docs: man:iscsid(8)
Process: 751 ExecStart=/sbin/iscsid (code=exited, status=0/SUCCESS)
Process: 721 ExecStartPre=/lib/open-iscsi/startup-checks.sh (code=exited,
status=0/SUCCESS)
Main PID: 759 (iscsid)
Tasks: 2 (limit: 548)
CGroup: /system.slice/iscsid.service
├─754 /sbin/iscsid
└─759 /sbin/iscsid
May 23 10:52:11 b1 systemd[1]: Starting iSCSI initiator daemon (iscsid)...
May 23 10:52:11 b1 systemd[1]: iscsid.service: Failed to parse PID from file
/run/iscsid.pid: Invalid argument
May 23 10:52:11 b1 iscsid[754]: iSCSI daemon with pid=759 started!
May 23 10:52:11 b1 systemd[1]: Started iSCSI initiator daemon (iscsid).
● open-iscsi.service - Login to default iSCSI targets
Loaded: loaded (/lib/systemd/system/open-iscsi.service; enabled; vendor
preset: enabled)
Active: inactive (dead)
Condition: start condition failed at Wed 2018-05-23 10:52:11 UTC; 7min ago
├─ ConditionDirectoryNotEmpty=|/etc/iscsi/nodes was not met
└─ ConditionDirectoryNotEmpty=|/sys/class/iscsi_session was not met
Docs: man:iscsiadm(8)
man:iscsid(8)
It is important to note that these are not "the same" service twice.
both belong to the same package:
dpkg -S /lib/systemd/system/open-iscsi.service
/lib/systemd/system/iscsid.service
open-iscsi: /lib/systemd/system/open-iscsi.service
open-iscsi: /lib/systemd/system/iscsid.service
But the two are doing rather different things:
open-iscsi.service: logs into iSCSI targets if some are configured (Condition
stops it from doing so) - this is more a one-shot configure-devices and not a
real service
iscsi.service: the basic service daemone, required by the service above
I think here we might learn from Fedora:
Default is:
[root@fedora ~]# systemctl status iscsid.socket iscsid.service
● iscsid.socket - Open-iSCSI iscsid Socket
Loaded: loaded (/usr/lib/systemd/system/iscsid.socket; enabled; vendor
preset: disabled)
Active: active (listening) since Wed 2018-05-23 11:26:37 UTC; 9s ago
Docs: man:iscsid(8)
man:iscsiadm(8)
Listen: @ISCSIADM_ABSTRACT_NAMESPACE (Stream)
May 23 11:26:37 fedora systemd[1]: Listening on Open-iSCSI iscsid
Socket.
● iscsid.service - Open-iSCSI
Loaded: loaded (/usr/lib/systemd/system/iscsid.service; disabled; vendor
preset: disabled)
Active: inactive (dead)
Docs: man:iscsid(8)
man:iscsiadm(8)
May 23 11:26:09 fedora systemd[1]: iscsid.service: Failed to reset
devices.list: Operation not permitted
May 23 11:26:09 fedora systemd[1]: Starting Open-iSCSI...
And the related config in /etc/iscsid.conf says:
# Use socket activation, but try to make sure the socket units are listening
iscsid.startup = /bin/systemctl start iscsid.socket iscsiuio.socket
(We don't have the uio, but you get the idea - initially only ensure the socket
runs.)
The socket then does:
# systemctl cat iscsid.socket
# /usr/lib/systemd/system/iscsid.socket
[Unit]
Description=Open-iSCSI iscsid Socket
Documentation=man:iscsid(8) man:iscsiadm(8)
[Socket]
ListenStream=@ISCSIADM_ABSTRACT_NAMESPACE
[Install]
WantedBy=sockets.target
The tools will reach that and activate the service:
# surely fails and does nothing, but activates the service
$ iscsiadm -m discovery -t st -p 1.2.3.4
Afterwards:
● iscsid.service - Open-iSCSI
Loaded: loaded (/usr/lib/systemd/system/iscsid.service; disabled; vendor
preset: disabled)
Active: active (running) since Wed 2018-05-23 11:30:41 UTC; 7s ago
So far our logic is inverse:
1. we start iscsid always
2. we pre-check if it is starte din open-iscsid
ExecStartPre=/bin/systemctl --quiet is-active iscsid.service
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1755858
Title:
iscsid autostarts on all servers when it has nothing to do
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https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1755858/+subscriptions
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