# 2. Manually Configuring a SLURM Standalone Cluster

Once all the nodes needed for a cluster have been created, they need to be configured. This page covers how to manually configure a standalone cluster, but OpenflightHPC recommends using the automatic configuration outlined in the Slurm standalone setup section. In the case of a standalone cluster, you will only need 1 node, if you haven't already, create it by following the instructions on the previous page

Flight Solo comes with the Flight user suite installed but not configured. There are no other nodes to connect to so setup is simple.

Become the root user.
```
sudo su -
```

Set the hostname.

hostnamectl set-hostname standalone1.pri.mycluster1.cluster.local

Go to the file /etc/hosts and add this: (make sure to add the local IP)

<local-IP> standalone1.pri.mycluster1.cluster.local standalone1.pri chead1

Change the name of the cluster:

 flight config set cluster.name mycluster1

Set the domain name to the hostname or ip address that Web-Suite will be accessed through. This also creates a self-certified certificate.
```
flight web-suite set-domain <name/IP>
```
Restart web suite to apply changes:
```
flight web-suite restart
```

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

 ClusterName=mycluster1
 ControlMachine=localhost
 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
 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/slurm/slurmctld.log
 SlurmdDebug=3
 SlurmdLogFile=/opt/flight/opt/slurm/var/log/slurm/slurmd.log
 JobCompType=jobcomp/none
 NodeName=localhost 
 PartitionName=all Nodes=ALL Default=YES MaxTime=UNLIMITED

Create directories for SLURM.

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

Set the owner of the directories.

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

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 ''
```
Copy the 64 digit code from the terminal, navigate to the file /etc/munge/munge.key, then paste it in.
Set the owner of the munge key.
```
chown munge: /etc/munge/munge.key
```
Set permissions on the munge key.
```
chmod 400 /etc/munge/munge.key
```

Start and enable munge and SLURM.

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