通过systemd运行Python脚本

Question

I am pretty new to writing systemd service scripts. I was following this useful page to write my own. It is failing as below.

The prodKPI.service contents in /etc/systemd/system/ in a Centos 7 machine are as

[Unit]
Description=prodKPI: Aggregation logic to compute device availability

[Service]
Type=simple
PermissionsStartOnly=true
User=deployuser
ExecStart = /usr/bin/python /tmp/app1/folder1/file1.py; /usr/bin/python /tmp/folder2/file2.py
Restart=always

[Install]
WantedBy=default.target

The steps I followed after creating the file are

systemctl daemon-reload
systemctl enable prodKPI.service

did a reboot and

# systemctl status prodKPI.service
● prodKPI.service - prodKPI: Aggregation logic to compute device availability
   Loaded: loaded (/etc/systemd/system/prodKPI.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Fri 2017-07-21 19:20:41 UTC; 15min ago
  Process: 1190 ExecStart=/usr/bin/python /tmp/app1/folder1/file1.py; /usr/bin/python /tmp/folder2/file2.py (code=exited, status=2)
 Main PID: 1190 (code=exited, status=2)

Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Jul 21 19:20:41 device-1 systemd[1]: Unit prodKPI.service entered failed state.
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service failed.
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service holdoff time over, scheduling restart.
Jul 21 19:20:41 device-1 systemd[1]: start request repeated too quickly for prodKPI.service
Jul 21 19:20:41 device-1 systemd[1]: Failed to start prodKPI.service: Aggregation logic to compute device availability.
Jul 21 19:20:41 device-1 systemd[1]: Unit prodKPI.service entered failed state.
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service failed.

which did not help much, from

journalctl -xe

-- Unit prodKPI.service has finished starting up.
-- 
-- The start-up result is done.
Jul 21 19:20:41 device-1 systemd[1]: Starting prodKPI.service: Aggregation logic to compute device availability...
-- Subject: Unit prodKPI.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit prodKPI.service has begun starting up.
Jul 21 19:20:41 device-1 python[1190]: /usr/bin/python: can't open file '/tmp/app1/folder1/file1.py;': [Errno 2] No such file or directory
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Jul 21 19:20:41 device-1 systemd[1]: Unit prodKPI.service entered failed state.
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service failed.
Jul 21 19:20:41 device-1 systemd[1]: prodKPI.service holdoff time over, scheduling restart.
Jul 21 19:20:41 device-1: start request repeated too quickly for prodKPI.service
Jul 21 19:20:41 device-1: Failed to start prodKPI.service: Aggregation logic to compute device availability.

The error line below indicates some kind of permission issues? Should the service unit be run with a different user (or) access levels? I changed the both the python files to be executable also

Jul 21 19:20:41 device-1 python[1190]: /usr/bin/python: can't open file '/tmp/app1/folder1/file1.py;': [Errno 2] No such file or directory

Answer 1

When Type is not oneshot you can only provide one command .

Also you are using bash syntax in your command. You have to wrap it in an intermediate Shell Process if you wan't to use bash syntax. Ie:

ExecStart=/usr/bin/bash -c "python /tmp/app1/folder1/file1.py; /usr/bin/python /tmp/folder2/file2.py"