From 26d5224865594256b508eb47247c3bd60e80be84 Mon Sep 17 00:00:00 2001
From: Guenther <guenther@physi.uni-heidelberg.de>
Date: Thu, 25 Jan 2024 14:16:57 +0100
Subject: [PATCH] Update 'computing_stackD0'

---
 computing_stackD0.md | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/computing_stackD0.md b/computing_stackD0.md
index c4fd8be..7d67543 100644
--- a/computing_stackD0.md
+++ b/computing_stackD0.md
@@ -1,22 +1,13 @@
-
-login to lhcba1
+login to lhcba2
 
 ```bash
-ssh -X -p30 lhcba1.physi.uni-heidelberg.de
-
-```
-
-
-setup the environment:
-
-```bash
-source /cvmfs/sft.cern.ch/lcg/views/LCG_101/x86_64-centos7-gcc8-opt/setup.sh
+ssh -X -p30 lhcba2.physi.uni-heidelberg.de
 
 ```
 
 Follow the instructions from https://gitlab.cern.ch:8443/rmatev/lb-stack-setup
 
-Make a folder to put the stack (50+ gigabytes) in
+Make a folder to put the stack (up to 50 gigabytes depending on the platform):
 
 ```bash
 cd /work/<username>
@@ -27,6 +18,12 @@ cd stack
 make #default config is used
 ```
 
-as of writing this, it downloaded, compiled, and installed without errors. 
+The above only works for CentOS7 (which is accessed by port 30 in the first command). CentOS7 is being phased out currently (February 2024) and replaced by an OS compatible with RHEL9. Hence, for cutting-edge LHCb software development ALMA9 can be used via singularity by:
+
+```
+export PATH=/work/software/singularity/latest/`/work/software/os_version`/bin:$PATH
+singularity exec --bind /run --bind /cvmfs --bind /auto /cvmfs/lhcb.cern.ch/containers/os-base/alma9-devel/prod/amd64 /bin/bash
+```
+It is likely that ALMA9 will be accessible via a port just like CentOS7 in the future.