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I am trying to use a ready-made bash script that sets env. This is the service that I'm trying to use:

[Unit]
Description=myserver service
After=multi-user.target

[Service]
Type=simple
User=ec2-user
Group=ec2-user
WorkingDirectory=/home/ec2-user/myserver/
ExecStart=/bin/sh -c '/home/ec2-user/myserver/config/myserverVars.sh ;/home/ec2-user/venv/bin/python  /home/ec2-user/myserver/myserver.py 2>&1 >> /home/ec2-user/myserver/logs/systemd_myserver.log' 
StandardOutput=append:/home/ec2-user/myserver/logs/systemd_stdout.log
StandardError=append:/home/ec2-user/myserver/logs/systemd_stderr.log

[Install]
WantedBy=multi-user.target

The myserverVars.sh:

#!/bin/bash
export [email protected]
export APP2_BIND_PASS=xxxxxx
export APP3=xxxxxx

the variables in /home/ec2-user/myserver/config/myserverVars.sh
are never set, and the server is started without the variables and this is wrong. I am trying to avoid using Environment key or Environment File.

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1
  • Note that Environment is the native mechanism in systemd, and the service unit file is intended to directly contain environment settings. The systemd people consider EnvironmentFile to have been a mistake, but conversely Environment is the way to set environment variables, either directly or with drop-in "snippet" files. unix.stackexchange.com/a/557081/5132 Commented Jun 12, 2020 at 13:10

2 Answers 2

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If you want variables defined in a script file to be available to the parent environment running that script, you need to source the script, not execute it. Change your ExecStart line to:

ExecStart=/bin/sh -c '. /home/ec2-user/myserver/config/myserverVars.sh ;/home/ec2-user/venv/bin/python  /home/ec2-user/myserver/myserver.py >> /home/ec2-user/myserver/logs/systemd_myserver.log 2>&1 '

See What is the difference between sourcing ('.' or 'source') and executing a file in bash? for details on the difference between sourcing and executing a script.

Also note that I changed the order of redirections. To get both stderr and stdout to the same file, you need > file 2>&1 not 2>&1 > file.

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  • any way to format this long string to something readble ? with line breaks "\" Commented Jun 11, 2020 at 13:39
  • @user63898 I don't know, did you try it with line breaks? If they dont' work, please ask a new question since that is a completely separate topic. Commented Jun 11, 2020 at 14:06
  • Of course, the redirections are a bad idea in the first place, as service management systems handle logging standard output/error. And there should be an exec in the invocation of python, to cope with the case that /bin/sh is the Bourne Again shell. Commented Jun 12, 2020 at 13:06
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For me this worked:

 ExecStart=/bin/bash -c 'MYVAR=xx exec /some/file'
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  • 2
    ...except that they are "trying to use a ready-made bash script that sets env", so hard-coding them independently in the systemd unit file risks configuration drift if someone edits the script but forgets to change the unit file. Commented Mar 30, 2022 at 17:15

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