OS Containers¶
CERN machines and many other grid sites have already running AlmaLinux9 OS, while some sites may still be running CentOS7 OS.
Old ATLAS releases are built on top of CentOS7 OS, while many latest releases are built on top of AlmaLinux9 OS. In order to run AlmaLinux9-based releases on CentOS7 machines, and to run CentOS7-based releases on AlmaLinux9 machines, OS Containers should be used.
Interactive Running of OS Containers¶
On a CentOS7 machine, the following command should be used to run AlmaLinux9-based ATLAS releases:
On an AlmaLinux9 machine, the following command should be used to run CentOS7-based ATLAS releases:
Batch Running of OS Containers¶
However, the above commands do not work in batch mode. This is because the command for running a container terminates the container after it completes its execution. As a result, any subsequent commands in the batch will run on the host machine instead of inside the container.
The command setupATLAS -c supports the option '-r' (or export ALRB_CONT_RUNPAYLOAD) to run container payload commands. That is:
Where the payload script myPayload.sh is something like: