That is interesting to me.
How do you use ulimit and systemd to limit user usage on the login
nodes? This sounds like something very useful.
Brian Andrus
On 10/31/2021 1:08 AM, Yair Yarom wrote:
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.alt...@gmail.com> wrote:
Thank you Tina.
It will really help
Regards
Navin
On Thu, Oct 28, 2021, 22:01 Tina Friedrich
<tina.friedr...@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.friedr...@it.ox.ac.uk
<mailto:tina.friedr...@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
// \ |ir...@cs.huji.ac.il
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