[slurm-users] Slurm - Munge configuration details

[Benson Muite]

On 2/2/21 3:40 PM, Benson Muite wrote:
> On 2/2/21 3:30 PM, Zainul Abiddin wrote:
>> 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/ <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 
>> <http://smaster.calligotech.com> systemd[1]: Starting MUNGE 
>> authentication service...
>> Feb 01 12:52:54 smaster.calligotech.com 
>> <http://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.png
>>
>> Snode:
>> 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*
>>
> Are you able to do passwordless ssh between the nodes?
> 
> May also find the following helpful:
> https://github.com/dun/munge/wiki/Installation-Guide
> https://southgreenplatform.github.io/trainings/hpc/slurminstallation/
> 
> 
See also
https://wiki.fysik.dtu.dk/niflheim/Slurm_installation