[slurm-users] Slurm - Munge configuration details

[Zainul Abiddin]

Hi All,
I am new to Slurm and trying to setup Slurm20.11.2 on Centos 7
My environment is Master node (smaster) + compute Node (snode)
and i am using
https://www.slothparadise.com/how-to-install-slurm-on-centos-7-cluster/
link to setup Slurm on Master and compute nodes.

I have tried installing Munge on both the nodes and it's running fine.
However when i try to run the Munge command from Master to Node its asking
password.

export MUNGEUSER=1001
groupadd -g $MUNGEUSER munge
useradd  -m -c "MUNGE Uid 'N' Gid Emporium" -d /var/lib/munge -u $MUNGEUSER
-g munge  -s /sbin/nologin munge
export SlurmUSER=1002
groupadd -g $SlurmUSER slurm
useradd  -m -c "Slurm workload manager" -d /var/lib/slurm -u $SlurmUSER -g
slurm  -s /bin/bash slurm

yum install -y epel-release
yum install munge munge-libs munge-devel -y

yum install rng-tools -y
rngd -r /dev/urandom
/usr/sbin/create-munge-key -r
dd if=/dev/urandom bs=1 count=1024 > /etc/munge/munge.key
chown munge: /etc/munge/munge.key
chmod 400 /etc/munge/munge.key

scp /etc/munge/munge.key root at snode:/etc/munge

chown munge: /etc/munge/munge.key
chmod 400 /etc/munge/munge.key
chown -R munge: /etc/munge/ /var/log/munge/
chmod 0700 /etc/munge/ /var/log/munge/

systemctl enable munge
systemctl start munge
systemctl status munge

[root at smaster ~]# systemctl status munge
? munge.service - MUNGE authentication service
   Loaded: loaded (/usr/lib/systemd/system/munge.service; enabled; vendor
preset: disabled)
   Active: active (running) since Mon 2021-02-01 12:52:54 IST; 1h 4min ago
     Docs: man:munged(8)
  Process: 2547 ExecStart=/usr/sbin/munged (code=exited, status=0/SUCCESS)
 Main PID: 2550 (munged)
    Tasks: 4
   CGroup: /system.slice/munge.service
           +-2550 /usr/sbin/munged

Feb 01 12:52:54 smaster.calligotech.com systemd[1]: Starting MUNGE
authentication service...
Feb 01 12:52:54 smaster.calligotech.com systemd[1]: Started MUNGE
authentication service.
[root at smaster ~]# munge -n
MUNGE:AwQDAAAg5PQzQhz/D4h7OGUU4Cx4QAgZ4z/0MMt0SP+uhuP927Xcl2t8EC4izsUj6xpMRslnIb2g4RCz2vayu0wW1o8mNNuy7cVv/PmsuO9XsAJ7aLl1n/M=:
[root at smaster ~]#

Below is the screenshot for reference.
Smaster:
[image: image.png]

Snode:
[image: image.png]

Am I configuring properly or Do I need to set up passwordless
authentication on Master to Node and vice-versa?

Please clarify to me, whether Mugne will do passwordless login else
do we need to setup passwordless.

Please guide me with a proper setup link/Doc which includes Munge
Configuration, Slurm account database Daemon configuration and Slurm
installation and configuration with testing simple jobs on Master and
Compute Nodes.

-- 
*Regards*
*Zain*
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