Introduction

Slurm is an open source, fault-tolerant, and highly scalable cluster management and job scheduling system for large and small Linux clusters.

It provides three key functions:

• allocating exclusive and/or non-exclusive access to resources (computer nodes) to users for some duration of time so they can perform work,
• providing a framework for starting, executing, and monitoring work (typically a parallel job such as MPI) on a set of allocated nodes, and
• arbitrating contention for resources by managing a queue of pending jobs.

Controller name: slurm-ctrl

Install slurm-wlm and tools

ssh slurm-ctrl
apt install slurm-wlm slurm-wlm-doc mailutils sview mariadb-client mariadb-server libmariadb-dev python-dev python-mysqldb

apt-get install mariadb-server
systemctl start mysql
mysql -u root
create database slurm_acct_db;
create user 'slurm'@'localhost';
set password for 'slurm'@'localhost' = password('slurmdbpass');
grant usage on *.* to 'slurm'@'localhost';
grant all privileges on slurm_acct_db.* to 'slurm'@'localhost';
flush privileges;
exit

In the file /etc/mysql/mariadb.conf.d/50-server.cnf we should have the following setting:

vi /etc/mysql/mariadb.conf.d/50-server.cnf
bind-address = localhost

First, let us configure the default options for the munge service:

vi /etc/default/munge
OPTIONS="--syslog --key-file /etc/munge/munge.key"

The main configuration file is /etc/slurm-llnl/slurm.conf this file has to be present in the controller and all of the compute nodes and it also has to be consistent between all of them.

vi /etc/slurm-llnl/slurm.conf 

###############################
# /etc/slurm-llnl/slurm.conf
###############################
# slurm.conf file generated by configurator easy.html.
# Put this file on all nodes of your cluster.
# See the slurm.conf man page for more information.
#
ControlMachine=slurm-ctrl
#ControlAddr=10.7.20.97
#
#MailProg=/bin/mail
MpiDefault=none
#MpiParams=ports=#-#
ProctrackType=proctrack/pgid
ReturnToService=1
SlurmctldPidFile=/var/run/slurm-llnl/slurmctld.pid
##SlurmctldPidFile=/var/run/slurmctld.pid
#SlurmctldPort=6817
SlurmdPidFile=/var/run/slurm-llnl/slurmd.pid
##SlurmdPidFile=/var/run/slurmd.pid
#SlurmdPort=6818
SlurmdSpoolDir=/var/spool/slurmd
SlurmUser=slurm
#SlurmdUser=root
StateSaveLocation=/var/spool
SwitchType=switch/none
TaskPlugin=task/none
#
#
# TIMERS
#KillWait=30
#MinJobAge=300
#SlurmctldTimeout=120
#SlurmdTimeout=300
#
#
# SCHEDULING
FastSchedule=1
SchedulerType=sched/backfill
SelectType=select/linear
#SelectTypeParameters=
#
#
# LOGGING AND ACCOUNTING
AccountingStorageType=accounting_storage/none
ClusterName=cluster
#JobAcctGatherFrequency=30
JobAcctGatherType=jobacct_gather/none
#SlurmctldDebug=3
SlurmctldLogFile=/var/log/slurm-llnl/SlurmctldLogFile
#SlurmdDebug=3
SlurmdLogFile=/var/log/slurm-llnl/SlurmLogFile
#
#
# COMPUTE NODES
NodeName=linux1 NodeAddr=10.7.20.98 CPUs=1 State=UNKNOWN

root@controller# systemctl start slurmctld

After we have the slurm-llnl-slurmdbd package installed we configure it, by editing the /etc/slurm-llnl/slurmdbd.conf file:

vi /etc/slurm-llnl/slurmdbd.conf

########################################################################
#
# /etc/slurm-llnl/slurmdbd.conf is an ASCII file which describes Slurm
# Database Daemon (SlurmDBD) configuration information.
# The contents of the file are case insensitive except for the names of
# nodes and files. Any text following a "#" in the configuration file is
# treated as a comment through the end of that line. The size of each
# line in the file is limited to 1024 characters. Changes to the
# configuration file take effect upon restart of SlurmDbd or daemon
# receipt of the SIGHUP signal unless otherwise noted.
#
# This file should be only on the computer where SlurmDBD executes and
# should only be readable by the user which executes SlurmDBD (e.g.
# "slurm"). This file should be protected from unauthorized access since
# it contains a database password.
#########################################################################
AuthType=auth/munge
AuthInfo=/var/run/munge/munge.socket.2
StorageHost=localhost
StoragePort=3306
StorageUser=slurm
StoragePass=slurmdbpass
StorageType=accounting_storage/mysql
StorageLoc=slurm_acct_db
LogFile=/var/log/slurm-llnl/slurmdbd.log
PidFile=/var/run/slurm-llnl/slurmdbd.pid
SlurmUser=slurm

root@controller# systemctl start slurmdbd

ssh csadmin@linux1; sudo -i
scp slurm-ctrl:/etc/munge/munge.key /etc/munge/

munge -n | unmunge | grep STATUS
STATUS:           Success (0)
munge -n | ssh slurm-ctrl unmunge | grep STATUS
STATUS:           Success (0)

sinfo
PARTITION AVAIL  TIMELIMIT  NODES  STATE NODELIST
debug*       up   infinite      1   idle linux1

A compute node is a machine which will receive jobs to execute, sent from the Controller, it runs the slurmd service.

ssh root@slurm-ctrl
root@controller# for i in `seq 1 2`; do scp /etc/munge/munge.key linux-${i}:/etc/munge/munge.key; done

root@compute-1# systemctl start munge

Run a job from slurm-ctrl

ssh csadmin
srun -N 1 hostname
linux1

https://slurm.schedmd.com/overview.html