[slurm-users] Slurm - Munge configuration details

[Zainul Abiddin]

Hi,
[root at smaster ~]# munge -n | unmunge
STATUS:           Success (0)
ENCODE_HOST:      smaster.calligotech.com (192.168.1.195)
ENCODE_TIME:      2021-02-01 13:58:04 +0530 (1612168084)
DECODE_TIME:      2021-02-01 13:58:04 +0530 (1612168084)
TTL:              300
CIPHER:           aes128 (4)
MAC:              sha1 (3)
ZIP:              none (0)
UID:              root (0)
GID:              root (0)
LENGTH:           0

[root at smaster ~]# munge -n | ssh snode unmunge
root at snode's password:
STATUS:           Success (0)
ENCODE_HOST:      smaster.calligotech.com (192.168.1.195)
ENCODE_TIME:      2021-02-01 13:58:16 +0530 (1612168096)
DECODE_TIME:      2021-02-01 13:58:21 +0530 (1612168101)
TTL:              300
CIPHER:           aes128 (4)
MAC:              sha1 (3)
ZIP:              none (0)
UID:              root (0)
GID:              root (0)
LENGTH:           0

[root at smaster ~]#

On Tue, Feb 2, 2021 at 6:00 PM Zainul Abiddin <zainul1114 at gmail.com> 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/
> 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*
>
>

-- 
*Thanks and Regards*
*Zainul Abiddin*
*Mob: +91 7406649679*
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