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k3s/longhorn: use LVM to support additional storage disks #693

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k3s/longhorn: use LVM to support additional storage disks #693

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7 changes: 3 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -587,10 +587,9 @@ To deploy a specific version of Longorn, use the `--longhorn-version` option:
$ sesdev create k3s --deploy-longhorn --longhorn-version=1.4.1
```

Currently Longhorn deployments will only use _one_ disk. If more are
specified using the `--num-disks` option, only the first disk will be
mounted for use by Longhorn. All other additional disks will remain
untouched.
The `--num-disks` option can be used if you want more than one storage disk.
All storage disks will be made part of a single linear LVM volume mounted for
use by Longhorn.

#### On a remote libvirt server via SSH

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12 changes: 8 additions & 4 deletions seslib/templates/k3s/provision.sh.j2
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Expand Up @@ -8,7 +8,7 @@ zypper --non-interactive install curl openssl
export PATH=$PATH:/usr/local/bin

{% if k3s_deploy_longhorn %}
zypper --non-interactive install nfs-client open-iscsi e2fsprogs
zypper --non-interactive install nfs-client open-iscsi e2fsprogs lvm2
systemctl enable iscsid
systemctl start iscsid
{% endif %} {# k3s_deploy_longhorn #}
Expand Down Expand Up @@ -193,12 +193,16 @@ curl -sfL https://get.k3s.io | K3S_URL=https://{{ master.fqdn }}:6443 sh -

{% if k3s_deploy_longhorn %}
if [ ! -b /dev/vdb ]; then
echo "ERROR: Longhorn deployments require one additional disk"
echo "ERROR: Longhorn deployments require at least one additional disk"
false
fi
mkfs.ext4 /dev/vdb

# This won't handle more than 25 disks. Tim is pretty sure that's fine.
vgcreate longhorn /dev/vd[b-z]
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@tserong tserong Apr 27, 2023

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I probably shouldn't call the vg longhorn, because that means we end up with /dev/longhorn/longhorn-data, and /dev/longhorn is the namespace used for longhorn volumes.

lvcreate --name longhorn-data -l 100%VG longhorn
mkfs.ext4 /dev/longhorn/longhorn-data
mkdir /var/lib/longhorn
echo "/dev/vdb /var/lib/longhorn ext4 defaults 0 2" >> /etc/fstab
echo "/dev/longhorn/longhorn-data /var/lib/longhorn ext4 defaults 0 2" >> /etc/fstab
mount /var/lib/longhorn
{% endif %} {# k3s_deploy_longhorn #}

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