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== Questions ==
How does refine use salts? https://gerrit.wikimedia.org/r/c/operations/puppet/+/679939


==Random notes==
==Random notes==
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====Puppet====
====Puppet====
https://www.digitalocean.com/community/tutorials/getting-started-with-puppet-code-manifests-and-modules
https://www.digitalocean.com/community/tutorials/getting-started-with-puppet-code-manifests-and-modules
===Learning===
Furud and flerovium: https://phabricator.wikimedia.org/T278421
Goal: reimage the nodes, keeping /srv in place.
razzi@flerovium:~$ lsblk
NAME                    MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda                        8:0    0 447.1G  0 disk
├─sda1                    8:1    0  46.6G  0 part
│ └─md0                    9:0    0  46.5G  0 raid1 /
└─sda2                    8:2    0 400.6G  0 part
  └─md1                    9:1    0 400.5G  0 raid1
    └─flerovium--vg-data 253:0    0 400.4G  0 lvm  /srv
sdb                        8:16  0 447.1G  0 disk
├─sdb1                    8:17  0  46.6G  0 part
│ └─md0                    9:0    0  46.5G  0 raid1 /
└─sdb2                    8:18  0 400.6G  0 part
  └─md1                    9:1    0 400.5G  0 raid1
    └─flerovium--vg-data 253:0    0 400.4G  0 lvm  /srv
flerovium has 2 disks, sda and sdb. sda is 447.1G and sdb is 447.1G.
sda is partitioned into sda1 and sda2.
sda1 is 46.6G, and is mounted on /.
It is configured to be redundant with sdb1 from sdb.
md = multiple devices: software raid.
> I think that the standard reuse recipe might not work, there is no mention in it about the md1/md0 raid arrays. For example I'd expect something that lists also:
/dev/md0|1 lvmpv ignore none, \
/dev/md1|1 lvmpv ignore none,
https://www.debian.org/releases/jessie/example-preseed.txt
# this workarounds LP #1012629 / Debian #666974
# it makes grub-installer to jump to step 2, where it uses bootdev
d-i    grub-installer/only_debian      boolean        false
> # This is fairly safe to set, it makes grub install automatically to the MBR
> # if no other operating system is detected on the machine.
d-i    grub-installer/bootdev  string  /dev/sda /dev/sdb
> # To install grub to multiple disks:
> #d-i grub-installer/bootdev  string (hd0,1) (hd1,1) (hd2,1)
d-i    partman/reuse_partitions_recipe        string \
> This seems like a fairly standard bit, but I can't figure out where reuse_partitions_recipe is from.
> There are other partman/ instructions, like:
#d-i partman/early_command \
#      string debconf-set partman-auto/disk "$(list-devices disk | head -n1)"
> I think I understand what sda|1 and sta|2 are: shorthand for sda1 and sda2.
                /dev/sda|1 biosboot ignore none|2 raid ignore none, \
> So then this line has, as first part, something resembling:
"sda1 is biosboot"
sda2 is raid
                /dev/sdb|1 biosboot ignore none|2 raid ignore none, \
                /dev/mapper/*-root|1 ext4 format /, \
                /dev/mapper/*-srv|1 ext4 keep /srv
Compare this to an-master:
razzi@an-master1001:~$ lsblk
NAME                        MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda                            8:0    0 223.6G  0 disk
├─sda1                        8:1    0  46.6G  0 part
│ └─md0                        9:0    0  46.5G  0 raid1 /
├─sda2                        8:2    0  954M  0 part
│ └─md1                        9:1    0 953.4M  0 raid1 [SWAP]
└─sda3                        8:3    0 176.1G  0 part
  └─md2                        9:2    0  176G  0 raid1
    └─an--master1001--vg-srv 253:0    0  176G  0 lvm  /srv
sdb                            8:16  0 223.6G  0 disk
├─sdb1                        8:17  0  46.6G  0 part
│ └─md0                        9:0    0  46.5G  0 raid1 /
├─sdb2                        8:18  0  954M  0 part
│ └─md1                        9:1    0 953.4M  0 raid1 [SWAP]
└─sdb3                        8:19  0 176.1G  0 part
  └─md2                        9:2    0  176G  0 raid1
    └─an--master1001--vg-srv 253:0    0  176G  0 lvm  /srv
So we'll need to rename the partition to srv.
Other than that, why is one "raid" and one "lvmpv" (logical volume management physical volume)?

Revision as of 17:38, 10 May 2021

Learning the Wikimedia stack!

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Documentation

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Questions

How does refine use salts? https://gerrit.wikimedia.org/r/c/operations/puppet/+/679939

Random notes

Puppet

https://www.digitalocean.com/community/tutorials/getting-started-with-puppet-code-manifests-and-modules

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