I'm trying to create a systemd unit file that will take an argument for a php script.
The small php script:
<?php
$val = $argv[1];
while(true) {
echo "Argument = $val\n";
sleep(1);
}
?>
Devs are working on the real script. All I need to do to test is take an argument, which is passed in the systemd unit file. Here it is:
[email protected]
[Unit]
Description=Systemd Params Test
Wants=network-online.target
After=network-online.target
[Service]
Environment=ARGS=%I
ExecStart=/usr/bin/php /home/myself/test_systemd.php $ARGS
StandardOutput=file:/var/log/test-multiple-systemd-$ARGS.log
[Install]
#Start after boot
WantedBy=multi-user.target
I start the multiple instances with systemctl start [email protected] and systemctl start [email protected]. When checking the services, I see:
root@servername:/lib/systemd/system# systemctl --type=service | grep test
[email protected] loaded active running Systemd Params Test
[email protected] loaded active running Systemd Params Test
It is not creating the different log files. It's only creating a single one, strangely with quotes around it:
-rw-r--r-- 1 root root 285 Dec 8 08:15 'test-multiple-systemd-$ARGS.log'
And the content of the log file is mostly "Argument = bar". Only a few instances of "Argument = foo" for some reason:
cat /var/log/test-multiple-systemd-\$ARGS.log
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
Argument = bar
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Argument = bar
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Argument = bar
Argument = bar
Argument = foo <--- WHY???
Argument = foo
Argument = foo
Argument = foo
Argument = foo
Argument = foo
Is it possible to write to different log files for each instance of the systemd unit? I would like to see test-multiple-systemd-foo.log and test-multiple-systemd-bar.log if those are the arguments I pass. I've tried escaping the $ in the log path to no avail. I've tried removing and adding quotes to the Environment="$ARGS=%I" also to no avail. The log always shows with quotes with the literal "$ARGS" in the name.
UPDATE
It appears I cannot create the multiple log files dynamically, per this answer.
So, I created the log writing in the php script with:
echo file_put_contents("/var/log/test-multiple-systemd-$val.log", "Argument=$val", FILE_APPEND);
Will this suffice? I'm getting the multiple log files now and they are writing the argument correctly to the log file.
