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+*Email from Alexey:*
+
+Dear colleagues,
+
+I have achieved what I have planed as default behavior in our batch system (HT Condor), when submission is done from CentOS7 container (currently only from lhcba1 port 30).
+
+`ssh -p 30 lhcba1.physi.uni-heidelberg.de`
+
+Without any extra flags in the configuration, jobs shoud run under
+CentOS7 (local container), after login scripts applied and in the current (at the time of submission) directory. Also jobs will run on "LHCb software compatible"
+servers only.
+
+There are currently 3 servers with 90 slots  in total which support that model. There will be one more with 16 slots.
+4 other servers are interactive at the moment,  lhcba1, d0new, lhcbi1 and not updated yet d0bar-new. They can be added for batch processing (also time limited, f.e. at nights and
+weekends) but there is no such plans at the moment.
+
+All other servers (many...) are "old". They will be updated to support mentioned submission, but they can fail to run particular versions of LHCb software.
+
+Simple test can be started from lhcba1 port 30, with command
+
+`condor_submit -interactive`
+
+An example of submission file is in
+/auto/work/zhelezov/singularity/batch_centos7. Do not forget to start job submission from directory into which you can write, otherwise log files can not be written and your jobs will be in "on hold" state forever.
+
+I still propose to use Singularity based approach when possible, demonstrated in  /auto/work/zhelezov/singularity/FCNCfitter.
+That allows to use SLC6 / CentOS8 / etc. without local installation on all servers.
+
+While not really checked, I believe the environment closely mimics current CERN/DESY HTCondor. Note that defaults are conservative (everywhere) in reserved resources (1 core, 512MB RAM). 
+It is better specify required resourced explicitly (as documented in general HTCondor manual).
+
+For the moment there is no multi-core slots and up to 8GB RAM per slot. 
+Jobs with higher requirements will find no working nodes. Please let me know if you hit the problem.
+
+Regards,
+Alexey.