Merge pull request #156 from stackhpc/fix/empty-partitions

Allow multiple empty partitions

molecule/README.md

@@ -32,7 +32,7 @@ Local installation on a RockyLinux 8.x machine looks like:
  sudo yum install -y git
  git clone [email protected]:stackhpc/ansible-role-openhpc.git
  cd ansible-role-openhpc/
- python3.9 -m venv venv
+ python3.8 -m venv venv
  . venv/bin/activate
  pip install -U pip
  pip install -r molecule/requirements.txt

templates/slurm.conf.j2

@@ -129,13 +129,15 @@ NodeName={{ hostlist }} State=UNKNOWN RealMemory={{ group.get('ram_mb', ram_mb)
  {% set _ = nodelist.append(extra_node_defn['NodeName']) %}
  {% endfor %}
  {% endfor %}{# group #}
-{% if not nodelist %} {# empty partition - define an invalid hostname which slurm accepts #}
- {% set nodelist = ['n/a'] %}
-NodeName={{ nodelist[0] }}
+{% if not nodelist %}{# empty partition #}
+{% set nodelist = ['""'] %}
 {% endif %}
 PartitionName={{part.name}} Default={{ part.get('default', 'YES') }} MaxTime={{ part.get('maxtime', openhpc_job_maxtime) }} State=UP Nodes={{ nodelist | join(',') }} {{ part.partition_params | default({}) | dict2parameters }}
 {% endfor %}{# partitions #}
 
+# Define a non-existent node, in no partition, so that slurmctld starts even with all partitions empty
+NodeName=nonesuch
+
 # Want nodes that drop out of SLURM's configuration to be automatically
 # returned to service when they come back.
 ReturnToService=2