Update "Install Slurm" documentation to leverage cloud-init

[lunamorrow]

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Description

Updating/extending the "Install Slurm" documentation guide to leverage OpenCHAMI's cloud-init to make compute node configuration persistent across nodes and on reboot. See discussion/comments on PR #72.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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For more info, see Contributing Guidelines.

[lunamorrow]

I have made some changes to the documentation to use cloud-init instead of manually configuring the compute node. This process also sets up NFS to mount shared files (e.g. Slurm configuration files) used by both the compute node and head node. The current commit only adds a basic compute node configuration (similar to what was already there, only with cloud-init now), but I am able to push up a more complex configuration which sets up LDAP and mounts the compute node with more memory for a more "realistic" Slurm setup. That way anyone who follows the guide will finish with a more production-ready Slurm configuration. Let me know what you think @synackd @davidallendj @alexlovelltroy

The merge I performed on this branch pulled in quite a lot of old commits which has clogged up this PR a bit, sorry about that!

[lunamorrow]

As an aside, has someone updated the documentation formatting? All of the in-line code and code block headings are black in the Tutorial, which makes it impossible to read some of the documentation. It still appears the same as usual when I render it locally, but it has changed on https://openchami.org/docs/tutorial/

Locally rendered:

From OpenCHAMI website:

[synackd]

I wonder if the rendering issues were caused by the updates in #88. @alexlovelltroy?

[synackd]

It might more likely be #81.

[davidallendj]

Just a small nit-pick: line 1303 says "short-name": "nid" but it should be "short-name": "de" here.

[davidallendj]

I tested this pretty extensively with a fresh JetStream 2 instance from start to finish, so I feel confident that the cloud-init additions work like expected so I'm going to go ahead and approve.

[synackd]

Thank you, @lunamorrow ! This is great.

I've asked for a few small changes based on my runthrough.

Also, this patch edits the cloud-init group for the compute SMD group. Idiomatic OpenCHAMI practice would warrant creating a separate slurm SMD group and setting the cloud-init group config for that group. Since this PR works, I'm inclined to keep the change and edit that later, but I will leave it up to you.

Also, long term, it might be good to refactor this to support newer Slurm/Munge versions so it's not a big task to update these docs, but that is a task for a different time.

[synackd]

(Commenting on file since this isn't in the diff)

When running this, it took a few minutes without any output and I anticipate readers suspecting something might be hanging. Can we add a note in the callout here stating that it could take a few minutes to complete without output?

[davidallendj]

I agree and I thought something went wrong the first time I ran it.

[synackd]

This is more of a nitpick, but I think it applies when having a large list of packages. Can we make this list alphabetical? That way it's straightforward to know where to add new packages to the list and its easy to visually search if a certain package is present.

[synackd]

These are the versions displayed when I ran through this:

1660M  s3://boot-images/compute/slurm/rocky9.7-compute-slurm-rocky9
  85M  s3://boot-images/efi-images/compute/slurm/initramfs-5.14.0-611.36.1.el9_7.x86_64.img
  14M  s3://boot-images/efi-images/compute/slurm/vmlinuz-5.14.0-611.36.1.el9_7.x86_64

[synackd]

Also will need to update in the BSS output below.

[synackd]

This works, but ideally we have a separate slurm group in SMD and set the cloud-init config for this group. That way we keep the compute group's config separate for general-purpose things. I think that, since this works, I'm inclined to accept this change and save this improvement for a different PR.