Jmeter doesn't interpreter machineName() variable - jmeter

Question

I faced with a strange issue. I need a jmeter to generate jtl and log files where name of the file will be hostname where jmeter is running on. For this task I found internal variable "__machineName()" in my case it works but only partially. Below is example:
jmeter ... -l ${__machineName()}.jtl -j ${__machineName()}.log
But result is a bit strange:
${__machineName()}.log 328-15-09-2020-15-02-42-95r4v.jtl
It works but only for jtl file! I've tried other variables and had the same result.
Have you faced with such issues?
Additional info: execution of jmeter is wrapped in the script that receives all properties as string and just execute it, therefore ideas about usage of shell commands won't work. Result will look the following way:
`hostname`.log or ${HOSTANME}.log
Workflow:
Python generate string with paramaters for jmeter execution. I'm using Jinja here. Part of the code:
Template( -Djava.net.preferIPv4Stack=true \
-l {{ log_dir }}/${__machineName()}.jtl \
-j {{ log_dir }}/${__machineName()}.log)
Python schedule Kubernetes Job and pass string with properties to the jmeter
Container with jmeter has entrypoint script here it set some Java params and start jmeter. Part where jmeter receives string with properties:
...
export JVM_ARGS="-Xmn${n}m -Xms${s}m -Xmx${x}m"
jmeter $#
Jmeter execute test with specific params and write logs. Exactly here I faced with a problem that ${__machineName()} works ok for -l(jtl log) param and doesn't work for -j(log) param.

Answer 1

The function will not be executed as it's between your shell and log4j logging system, you need to fix your shell script in order to be able to shell commands.
If for some reason you cannot amend your shell script it should be possible to change JMeter logging configuration so it would contain environment variable lookup
Necessary changes to log4j2.xml file (lives in "bin" folder of your JMeter installation)
Add this block to define HOSTNAME property reading the underlying OS environment variable
<Properties>
<Property name="HOSTNAME">${env:HOSTNAME}</Property>
</Properties>
Change this line:
<File name="jmeter-log" fileName="${sys:jmeter.logfile:-jmeter.log}" append="false">
to this one:
<File name="jmeter-log" fileName="${HOSTNAME}.log" append="false">
so next time you start your test JMeter will create the log file with using your machine hostname as the filename and you won't have to pass it via command-line argument.
More information: How to Configure JMeter Logging