I did some further testing and is I start syslog-ng manualy with:

/sbin/syslog-ng -F -p /var/run/syslogd.pid

If I start with:
systemctl start syslog-ng

it fails.
I'm running syslog-ng 3.24 on a Centos 7 linux machine.

Seems like it's related with systemd...
But i'm stuck here...

Thanks four your help.

Regards,
Armando Martires

Hi,

I set up my destination in syslog-ng config file as follows:

    destination d_syslog2snmp {

        program("/apps/syslog-ng/syslog2snmp.py" template("<${PRI}>${DATE} ${HOST} ${MESSAGE}\n"));

    };

My Script is like this:

    #!/usr/bin/python3
    while True:

        msg = input()
        f = open("/tmp/pysnmp.out","a+")
        f.write(f"{ line  }")
        f.close()

But I'm getting this in loop on my log file:

    Oct 24 17:56:37 lab-srv-slg-v01 syslog-ng[9934]: Child program exited, restarting; cmdline='/apps/syslog-ng/syslog2snmp.py', status='32256'

I also tried to use a bash script exactly as the manual gives as an example but I get the same kind of error loop.
Does any one have a clue on how to solve this?

Regards,
Armando Martires

On 10/23/2019 4:51 PM, László Várady (lvarady) wrote:

Hi,

> How can I configure syslog-ng to use this alternative binary file?

If you are using the Python destination (not the program() destination executing the python3 binary), then syslog-ng does not use the Python binary at all.

The python() destination starts a separate thread inside syslog-ng instead, and uses the libpython library to interpret Python code.

In case you have syslog-ng compiled with Python 3 support, you can specify which libpython to use with the LD_LIBRARY_PATH environment variable or with standard ldconfig configurations.

For example: /apps/lib/libpython3.so --> LD_LIBRARY_PATH=/apps/lib

A syslog-ng instance compiled with Python 2 support currently can't be configured to use Python 3, you have to recompile it from source in this case (./configure --enable-python --with-python=3, for example).

The PKG_CONFIG_PATH envvar can be used to help the configure script find the appropriate path to libpython.

--

László Várady