From 2fa40d5a6d5c450a8abbda3603423f262dd9d009 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antoine=20Beaupr=C3=A9?= <anarcat@debian.org>
Date: Wed, 29 Jan 2020 13:31:58 -0500
Subject: [PATCH] add secondary disk instructions
---
tsa/howto/ganeti.mdwn | 32 +++++++++++++++++++++-----------
1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/tsa/howto/ganeti.mdwn b/tsa/howto/ganeti.mdwn
index 4b8aa827..43cfc269 100644
--- a/tsa/howto/ganeti.mdwn
+++ b/tsa/howto/ganeti.mdwn
@@ -275,19 +275,25 @@ Import procedure:
echo "$KEY_FROM_KVM_HOST" >> /etc/ssh/userkeys/root
- 4. copy the `.qcow` file over, from the KVM host to the SPARE NODE:
+ 4. copy the `.qcow` file(s) over, from the KVM host to the SPARE NODE:
rsync -P $KVM_HOST:/srv/vmstore/$INSTANCE/$INSTANCE-root /srv/
+ rsync -P $KVM_HOST:/srv/vmstore/$INSTANCE/$INSTANCE-lvm /srv/ || true
5. on the SPARE NODE, create and initialize a logical volume with the predetermined size:
- lvcreate -L 20GiB -n $INSTANCE-root vg_ganeti
- qemu-img convert /srv/$INSTANCE-root -O raw /dev/vg_ganeti/$INSTANCE-root
lvcreate -L 4GiB -n $INSTANCE-swap vg_ganeti
mkswap --uuid $SWAP_UUID /dev/vg_ganeti/$INSTANCE-swap
-
- TODO: the above assumes only two disk devices, which is usually
- incorrect.
+ lvcreate -L 20GiB -n $INSTANCE-root vg_ganeti
+ qemu-img convert /srv/$INSTANCE-root -O raw /dev/vg_ganeti/$INSTANCE-root
+ lvcreate -L 40GiB -n $INSTANCE-lvm vg_ganeti
+ qemu-img convert /srv/$INSTANCE-lvm -O raw /dev/vg_ganeti_hdd/$INSTANCE-lvm
+
+ Note how we assume two disks above, but the instance might have a
+ different configuration that would require changing the above. The
+ above, common, configuration is to have an LVM disk separate from
+ the "root" disk, the former being on a HDD, but the HDD is
+ sometimes completely omitted and sizes can differ.
Sometimes it might be worth using pv to get progress on long
transfers:
@@ -295,12 +301,17 @@ Import procedure:
qemu-img convert /srv/$INSTANCE-lvm -O raw /srv/$INSTANCE-lvm.raw
pv /srv/$INSTANCE-lvm.raw | dd of=/dev/vg_ganeti_hdd/$INSTANCE-lvm bs=4k
+ TODO: ideally, the above procedure (and many steps below as well)
+ would be automatically deduced from the disk listing established
+ in the first step.
+
6. on the MASTER NODE, create the instance, adopting the LV:
gnt-instance add -t plain \
-n fsn-node-03 \
--disk 0:adopt=$INSTANCE-root \
--disk 1:adopt=$INSTANCE-swap \
+ --disk 2:adopt=$INSTANCE-lvm,vg=vg_ganeti_hdd \
--backend-parameters memory=2g,vcpus=2 \
--net 0:ip=pool,network=gnt-fsn \
--no-name-check \
@@ -348,13 +359,12 @@ Import procedure:
gnt-instance stop $INSTANCE
- on the KVM node:
-
- rsync -P /srv/vmstore/$INSTANCE/$INSTANCE-root $SPARE_NODE:/srv/
-
on the Ganeti node:
- qemu-img convert /srv/$INSTANCE-root -O raw /dev/vg_ganeti/$INSTANCE-root
+ rsync -P $KVM_HOST:/srv/vmstore/$INSTANCE/$INSTANCE-root /srv/ &&
+ qemu-img convert /srv/$INSTANCE-root -O raw /dev/vg_ganeti/$INSTANCE-root &&
+ rsync -P $KVM_HOST:/srv/vmstore/$INSTANCE/$INSTANCE-lvm /srv/ &&
+ qemu-img convert /srv/$INSTANCE-lvm -O raw /dev/vg_ganeti_hdd/$INSTANCE-lvm
13. switch to DRBD, still on the Ganeti MASTER NODE:
--
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