[slurm-users] Slurm Multi-cluster implementation
Yair Yarom
irush at cs.huji.ac.il
Sun Oct 31 08:08:29 UTC 2021
Hi,
If it helps, this is our setup:
6 clusters (actually a bit more)
1 mysql + slurmdbd on the same host
6 primary slurmctld on 3 hosts (need to make sure each have a distinct
SlurmctldPort)
6 secondary slurmctld on an arbitrary node on the clusters themselves.
1 login node per cluster (this is a very small VM, and the users are
limited both to cpu time (with ulimit) and memory (with systemd))
The slurm.conf's are shared on nfs to everyone in /path/to/nfs/<cluster
name>/slurm.conf. With symlink to /etc for the relevant cluster per node.
The -M generally works, we can submit/query jobs from a login node of one
cluster to another. But there's a caveat to notice when upgrading. slurmdbd
must be upgraded first, but usually we have a not so small gap between
upgrading the different clusters. This causes the -M to stop working
because binaries of one version won't work on the other (I don't remember
in which direction).
We solved this by using an lmod module per cluster, which both sets the
SLURM_CONF environment, and the PATH to the correct slurm binaries (which
we install in /usr/local/slurm/<version>/ so that they co-exists). So when
the -M won't work, users can use:
module load slurm/clusterA
squeue
module load slurm/clusterB
squeue
BR,
On Thu, Oct 28, 2021 at 7:39 PM navin srivastava <navin.altair at gmail.com>
wrote:
> Thank you Tina.
> It will really help
>
> Regards
> Navin
>
> On Thu, Oct 28, 2021, 22:01 Tina Friedrich <tina.friedrich at it.ox.ac.uk>
> wrote:
>
>> Hello,
>>
>> I have the database on a separate server (it runs the database and the
>> database only). The login nodes run nothing SLURM related, they simply
>> have the binaries installed & a SLURM config.
>>
>> I've never looked into having multiple databases & using
>> AccountingStorageExternalHost (in fact I'd forgotten you could do that),
>> so I can't comment on that (maybe someone else can); I think that works,
>> yes, but as I said never tested that (didn't see much point in running
>> multiple databases if one would do the job).
>>
>> I actually have specific login nodes for both of my clusters, to make it
>> easier for users (especially those with not much experience using the
>> HPC environment); so I have one login node connecting to cluster 1 and
>> one connecting to cluster 1.
>>
>> I think the relevant bits of slurm.conf Relevant config entries (if I'm
>> not mistaken) on the login nodes are probably:
>>
>> The differences in the slurm config files (that haven't got to do with
>> topology & nodes & scheduler tuning) are
>>
>> ClusterName=cluster1
>> ControlMachine=cluster1-slurm
>> ControlAddr=/IP_OF_SLURM_CONTROLLER/
>>
>> ClusterName=cluster2
>> ControlMachine=cluster2-slurm
>> ControlAddr=/IP_OF_SLURM_CONTROLLER/
>>
>> (where IP_OF_SLURM_CONTROLLER is the IP address of host cluster1-slurm,
>> same for cluster2)
>>
>> And then the have common entries for the AccountingStorageHost:
>>
>> AccountingStorageHost=slurm-db-prod
>> AccountingStorageBackupHost=slurm-db-prod
>> AccountingStoragePort=7030
>> AccountingStorageType=accounting_storage/slurmdbd
>>
>> (slurm-db-prod is simply the hostname of the SLURM database server)
>>
>> Does that help?
>>
>> Tina
>>
>> On 28/10/2021 14:59, navin srivastava wrote:
>> > Thank you Tina.
>> >
>> > so if i understood correctly.Database is global to both cluster and
>> > running on login Node?
>> > or is the database running on one of the master Node and shared with
>> > another master server Node?
>> >
>> > but as far I have read that the slurm database can also be separate on
>> > both the master and just use the parameter
>> > AccountingStorageExternalHost so that both databases are aware of each
>> > other.
>> >
>> > Also on the login node in slurm .conf file pointed to which Slurmctld?
>> > is it possible to share the sample slurm.conf file of login Node.
>> >
>> > Regards
>> > Navin.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Thu, Oct 28, 2021 at 7:06 PM Tina Friedrich
>> > <tina.friedrich at it.ox.ac.uk <mailto:tina.friedrich at it.ox.ac.uk>> wrote:
>> >
>> > Hi Navin,
>> >
>> > well, I have two clusters & login nodes that allow access to both.
>> That
>> > do? I don't think a third would make any difference in setup.
>> >
>> > They need to share a database. As long as the share a database, the
>> > clusters have 'knowledge' of each other.
>> >
>> > So if you set up one database server (running slurmdbd), and then a
>> > SLURM controller for each cluster (running slurmctld) using that one
>> > central database, the '-M' option should work.
>> >
>> > Tina
>> >
>> > On 28/10/2021 10:54, navin srivastava wrote:
>> > > Hi ,
>> > >
>> > > I am looking for a stepwise guide to setup multi cluster
>> > implementation.
>> > > We wanted to set up 3 clusters and one Login Node to run the job
>> > using
>> > > -M cluster option.
>> > > can anybody have such a setup and can share some insight into
>> how it
>> > > works and it is really a stable solution.
>> > >
>> > >
>> > > Regards
>> > > Navin.
>> >
>> > --
>> > Tina Friedrich, Advanced Research Computing Snr HPC Systems
>> > Administrator
>> >
>> > Research Computing and Support Services
>> > IT Services, University of Oxford
>> > http://www.arc.ox.ac.uk <http://www.arc.ox.ac.uk>
>> > http://www.it.ox.ac.uk <http://www.it.ox.ac.uk>
>> >
>>
>> --
>> Tina Friedrich, Advanced Research Computing Snr HPC Systems Administrator
>>
>> Research Computing and Support Services
>> IT Services, University of Oxford
>> http://www.arc.ox.ac.uk http://www.it.ox.ac.uk
>>
>>
--
/| |
\/ | Yair Yarom | System Group (DevOps)
[] | The Rachel and Selim Benin School
[] /\ | of Computer Science and Engineering
[]//\\/ | The Hebrew University of Jerusalem
[// \\ | T +972-2-5494522 | F +972-2-5494522
// \ | irush at cs.huji.ac.il
// |
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