Systemd Unit Fails at Boot, but Succeeds when Started from the Console

[Jonathan Ryshpan <jonrysh@xxxxxxxxxxx>]

This unit 

$ cat /etc/systemd/system/noip-duc.service  
[Unit]
Description=No-IP Dynamic Update Client
After=network.target auditd.service

[Service]
EnvironmentFile=/etc/sysconfig/noip-duc
ExecStart=/usr/local/bin/noip-duc
Restart=on-failure
Type=simple

[Install]
WantedBy=multi-user.target

always fails at boot time with the message status=2/INVALIDARGUMENT

Here is an extract from the system log (a fuller extract is attached):

Mar 18 07:57:56 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 1.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 2.

However if the unit is started from the console after the boot process is complete:

$ systemctrl start noip-duc.service

it succeeds.

How can I find out what the argument is with which systemd is invoking noip-duc, so I can understand why it is invalid at boot time but valid when the unit is started afterwards from the console? I would simply recompile it to output this, but noip-duc is written in the rust programming language, which I to lazy to learn for this one application.

-- 

Sincerely Jonathan Ryshpan <jonrysh@xxxxxxxxxxx>

	We dance around in a ring and suppose
	But the secret sits in the center and knows.
	- Robert Frost

Mar 18 07:57:56 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:58 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:59 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Mar 18 07:57:59 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:59 OaklandWeather.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 07:57:56 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 1.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 2.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 3.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 4.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:58 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: noip-duc.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: noip-duc.service: Scheduled restart job, restart counter is at 5.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: Stopped noip-duc.service - No-IP Dynamic Update Client.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: noip-duc.service: Start request repeated too quickly.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: noip-duc.service: Failed with result 'exit-code'.
Mar 18 07:57:59 OaklandWeather.localdomain systemd[1]: Failed to start noip-duc.service - No-IP Dynamic Update Client.
Mar 18 08:03:33 OaklandWeather.localdomain systemd[1]: Started noip-duc.service - No-IP Dynamic Update Client.
Mar 18 08:03:33 OaklandWeather.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=noip-duc comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Mar 18 08:03:33 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:03:33Z INFO  noip_duc] Starting update loop
Mar 18 08:03:33 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:03:33Z INFO  noip_duc::public_ip] Attempting to get IP with method Dns(No-IP Anycast DNS Tools)
Mar 18 08:03:33 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:03:33Z INFO  noip_duc] got new ip; ip=45.30.89.101, last_ip=0.0.0.0
Mar 18 08:03:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:03:35Z INFO  noip_duc] update succeeded; ip=45.30.89.101, changed=false
Mar 18 08:03:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:03:35Z INFO  noip_duc] checking ip again in 5m
Mar 18 08:08:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:08:35Z INFO  noip_duc::public_ip] Attempting to get IP with method Dns(No-IP Anycast DNS Tools)
Mar 18 08:08:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:08:35Z INFO  noip_duc] checking ip again in 5m
Mar 18 08:13:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:13:35Z INFO  noip_duc::public_ip] Attempting to get IP with method Dns(No-IP Anycast DNS Tools)
Mar 18 08:13:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:13:35Z INFO  noip_duc] checking ip again in 5m
Mar 18 08:18:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:18:35Z INFO  noip_duc::public_ip] Attempting to get IP with method Dns(No-IP Anycast DNS Tools)
Mar 18 08:18:35 OaklandWeather.localdomain noip-duc[2665]: [2023-03-18T15:18:35Z INFO  noip_duc] checking ip again in 5m

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