# Setup SLURM Server

The following section has to be done on the head node.

1. Swap to the head node (unless already on it).

2. Install munge.

    yum install -y munge munge-libs perl-Switch numactl

3. Install the SLURM packages.

    yum install -y flight-slurm flight-slurm-slurmctld flight-slurm-devel flight-slurm-perlapi flight-slurm-torque flight-slurm-slurmd flight-slurm-example-configs flight-slurm-libpmi

4. Open the file /opt/flight/opt/slurm/etc/slurm.conf and add this information:

    ControlMachine=chead1
    SlurmUser=nobody
    SlurmctldPort=6827
    SlurmdPort=6828
    AuthType=auth/munge
    StateSaveLocation=/opt/flight/opt/slurm/var/spool/slurm.state
    SlurmdSpoolDir=/opt/flight/opt/slurm/var/spool/slurmd.spool
    SwitchType=switch/none
    MpiDefault=none
    SlurmctldPidFile=/opt/flight/opt/slurm/var/run/slurmctld.pid
    ClusterName=mycluster1
    SlurmdPidFile=/opt/flight/opt/slurm/var/run/slurmd.pid
    ProctrackType=proctrack/pgid
    ReturnToService=2
    SlurmctldTimeout=300
    SlurmdTimeout=300
    InactiveLimit=0
    MinJobAge=300
    KillWait=30
    Waittime=0
    SchedulerType=sched/backfill
    SelectType=select/cons_res
    SelectTypeParameters=CR_CORE_Memory
    SlurmctldDebug=3
    SlurmctldLogFile=/opt/flight/opt/slurm/var/log/slurmctld.log
    SlurmdDebug=3
    SlurmdLogFile=/opt/flight/opt/slurm/var/log/slurmd.log
    JobCompType=jobcomp/none
    NodeName=cnode[01-02]
    PartitionName=all Nodes=ALL Default=YES MaxTime=UNLIMITED                         

5. Create directories for SLURM.

    mkdir -p /opt/flight/opt/slurm/var/{log,run,spool/slurm.state}

6. Set the owner of the directories.

    chown -R nobody: /opt/flight/opt/slurm/var/{log,run,spool}

7. Generate a random 64 digit alphanumeric string to be used as a munge key.

    tr -dc A-Za-z0-9 </dev/urandom | head -c 64 ; echo ''

8. Copy the 64 digit code from the terminal, navigate to the file /etc/munge/munge.key, then paste it in.

9. Set the owner of the munge key.

    chown munge: /etc/munge/munge.key

10. Set permissions on the munge key.

    chmod 400 /etc/munge/munge.key

11. Start and enable munge and SLURM.

    systemctl start munge
    systemctl enable munge
    systemctl start flight-slurmctld
    systemctl enable flight-slurmctld

Now the SLURM server has been set up, the SLURM clients need to be set up on the other nodes.

# Testing

If all was successful, then the following should be the case on the head node:

1. The command systemctl status munge shows the service as active with no errors.

2. The command systemctl status flight-slurmctld shows the service as active with no errors.

3. The file /opt/flight/opt/slurm/etc/slurm.conf has all the necessary options set. An example file is given in the instructions.

4. The /opt/flight/opt/slurm/var directory exists, and contains these three directories:

    [root@chead1 (mycluster1) ~]# ls /opt/flight/opt/slurm/var/
    log  run  spool

5. The /opt/flight/opt/slurm/var directory has these permissions:

   [root@chead1 (mycluster1) ~]# ls -l /opt/flight/opt/slurm/var/
   total 0
   drwxr-xr-x. 2 nobody nobody 27 Sep 20 14:22 log
   drwxr-xr-x. 2 nobody nobody 27 Sep 20 14:22 run
   drwxr-xr-x. 3 nobody nobody 25 Sep 20 14:11 spool

6. The munge key (/etc/munge/munge.key) should be the same on all nodes.

7. The munge key (/etc/munge/munge.key) should have these permissions:

    [root@chead1 (mycluster1) ~]# ls -l /etc/munge/munge.key
    -r--------. 1 munge munge 65 Sep 20 14:18 /etc/munge/munge.key