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Table of Contents
SLURM - Simple Linux Utility for Resource Management
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.
Installation
Controller
Controller name: slurm-ctrl
Install slurm-wlm and tools
ssh slurm-ctrl apt install slurm-wlm slurm-wlm-doc mailutils mariadb-client mariadb-server libmariadb-dev python-dev python-mysqldb
Install Maria DB Server
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
Node Authentication
First, let us configure the default options for the munge service:
vi /etc/default/munge OPTIONS="--syslog --key-file /etc/munge/munge.key"
Central Controller
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@slurm-ctrl# scp /etc/slurm-llnl/slurm.conf csadmin@10.7.20.98:/tmp/.; scp /etc/slurm-llnl/slurm.conf csadmin@10.7.20.102:/tmp/. root@slurm-ctrl# systemctl start slurmctld
Accounting Storage
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@slurm-ctrl# systemctl start slurmdbd
Authentication
Copy /etc/munge.key to all compute nodes
scp /etc/munge/munge.key csadmin@10.7.20.98:/tmp/.
Allow password-less access to slurm-ctrl
csadmin@slurm-ctrl:~$ ssh-copy-id -i .ssh/id_rsa.pub 10.7.20.102:
Run a job from slurm-ctrl
ssh csadmin@slurm-ctrl srun -N 1 hostname linux1
Test munge
munge -n | unmunge | grep STATUS STATUS: Success (0) munge -n | ssh slurm-ctrl unmunge | grep STATUS STATUS: Success (0)
Test Slurm
sinfo PARTITION AVAIL TIMELIMIT NODES STATE NODELIST debug* up infinite 1 idle linux1
Compute Nodes
A compute node is a machine which will receive jobs to execute, sent from the Controller, it runs the slurmd service.
Installation
ssh -l csadmin 10.7.20.102 sudo apt install slurm-wlm
Generate ssh keys
ssh-keygen
Copy ssh-keys to slurm-ctrl (using IP, because no DNS in place)
ssh-copy-id -i ~/.ssh/id_rsa.pub csadmin@10.7.20.97:
Become root to do important things:
sudo -i vi /etc/hosts
Add those lines below to the /etc/hosts file
10.7.20.97 slurm-ctrl.inf.unibz.it slurm-ctrl 10.7.20.98 linux1.inf.unibz.it linux1
First copy the munge keys from the slurm-ctrl to all compute nodes, now fix location, owner and permission.
mv /tmp/munge.key /etc/munge/. chown munge:munge /etc/munge/munge.key chmod 400 /etc/munge/munge.key
Place /etc/slurm-llnl/slurm.conf in right place,
mv /tmp/slurm.conf /etc/slurm-llnl/ chown root: /etc/slurm-llnl/slurm.conf