Basic confusion about cluster config

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Hi all,

I think I am misunderstanding something basic. I thought that if I specified a section like this in my cluster config:

v2:
  ...
  login:
    host: "login_node_name.my.org"

…that OOD would ssh to that node to submit cluster jobs and run other cluster-related binaries. But when I try it I get an error that the sbatch binary is not found (it’s there on the login node, but not on my web node (yet)).

So it seems that if I really want to ssh to the head/login node I need to set up bin_overrides.

OK. But that leaves me to wonder what the login section is for. We run slurm here and as long as you are on a head node you don’t need to know the names of any other nodes, you can submit a job via the command line with sbatch.

So I am wondering what the login/host section is for. Maybe other schedulers work differently and require it?

Just a note about how I am setting things up - at the moment I am just putting together some ansible code to set up the web host (and I see there are ansible roles to set up cluster configs, that is awesome). Currently the web host does not have slurm installed but eventually it will. In the meantime I plan to use bin_overrides just for the few of us who are testing this out. I realize that using an ssh wrapper in a bin_overrides script is not really ideal for a production scenario because we can’t guarantee that every user will have passwordless ssh access to the login node.

BTW, what threw me off was step 2 here. It seemed to imply (to me anyway) that OOD would ssh to this node to kick off jobs.

Thanks in advance.

2

It is for the shell app. The host listed here will be the host you shell into in the Clusters menu.

Instead of bin_overrides, I believe you can supply a submit_host instead. That may be easier.

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