[slurm-users] Slurm - Munge configuration details

[Zainul Abiddin]

Hi Benson,

I am not able to do passwordless ssh  between master and compute nodes
using Munge service.
when i am running below command , here it is asking for a password for the
compute node.

*Am I configuring properly or not, so I need clarity on this?*

[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 ~]#

Regards,
Zain

On Tue, Feb 2, 2021 at 6:05 PM Zainul Abiddin <zainul1114 at gmail.com> wrote:

> 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*
>>
>>
>
>
>
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