Does OpenPBS 20 clients support pbspro 19.1 server

I have a CentOS 7.7 cluster running PBSPro 19.1. I would like to add some CentOS 8.1 compute nodes to for testing and tried to install the OpenPBS 20 CentOS 8.1 binaries and then connect it back to the 19.1 server. Did something change in the new version that broke this or am I doing something wrong?

Jon

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This is an important question, because compiling PBSPro 19.1.3 (from pbspro_src.zip) for CentOS 8 is more difficult than one would expect - there have been a number of hoops to jump through - usually related to Python. My last was:

make[3]: Entering directory '/root/src/pbspro/src/lib/Libpython'
gcc -DHAVE_CONFIG_H -I. -I../../../src/include  -I../../../src/include -I/usr/include/python2.7 -I/usr/include/python2.7   -g -O2 -MT libpbspython_a-common_python_utils.o -MD -MP -MF .deps/libpbspython_a-common_python_utils.Tpo -c -o libpbspython_a-common_python_utils.o `test -f 'common_python_utils.c' || echo './'`common_python_utils.c
In file included from common_python_utils.c:40:
../../../src/include/pbs_python_private.h:64:10: fatal error: Python.h: No such file or directory
 #include <Python.h>
          ^~~~~~~~~~
compilation terminated.

So I install python2 and python2-devel. next issue is:

make[3]: Entering directory '/root/src/pbspro/src/lib/Libsite'
gcc -DHAVE_CONFIG_H -I. -I../../../src/include  -I../../../src/include -I../../../src/resmom/   -g -O2 -MT libsite_a-site_alt_rte.o -MD -MP -MF .deps/libsite_a-site_alt_rte.Tpo -c -o libsite_a-site_alt_rte.o `test -f 'site_alt_rte.c' || echo './'`site_alt_rte.c
mv -f .deps/libsite_a-site_alt_rte.Tpo .deps/libsite_a-site_alt_rte.Po
gcc -DHAVE_CONFIG_H -I. -I../../../src/include  -I../../../src/include -I../../../src/resmom/   -g -O2 -MT libsite_a-site_mom_chu.o -MD -MP -MF .deps/libsite_a-site_mom_chu.Tpo -c -o libsite_a-site_mom_chu.o `test -f 'site_mom_chu.c' || echo './'`site_mom_chu.c
site_mom_chu.c:59:10: fatal error: mom_mach.h: No such file or directory
 #include "mom_mach.h"
          ^~~~~~~~~~~~
compilation terminated.

So now I’m hoping this solution works

Managed to get 19.1.3 installed on CentOS 8.2, took some wrestling but we got there. Works fine. So there’s definitely a change in the 19.1.3/20.0 upgrade that makes them (19.x server, 20.x client) incompatible.

Older version clients are not required/tested to work with the new/upgraded server. It is best to upgrade the client package as well.