testaroli and pestaroli (Debian 12 one-legged DRBD tests)

Introduction

This page describes the installation of testaroli and pestaroli for a test of one-legged DRBD devices on Debian 12.

Procedure

Make note of the following volume creation commands:

create-perfect-drbd-vol -v --remote=torchio --name=testaroli --size=21G \
    --name1=fiori --ip1=192.168.3.6 --name2=torchio --ip2=192.168.3.7
create-perfect-drbd-vol -v --remote=torchio --name=pestaroli --size=21G \
    --name1=fiori --ip1=192.168.3.6 --name2=torchio --ip2=192.168.3.7
create-perfect-drbd-vol -v --remote=torchio --name=testaroli_vms --size=60G \
    --name1=fiori --ip1=192.168.3.6 --name2=torchio --ip2=192.168.3.7
create-perfect-drbd-vol -v --remote=torchio --name=pestaroli_vms --size=60G \
--name1=fiori --ip1=192.168.3.6 --name2=torchio --ip2=192.168.3.7

and the following container creation commands:

create-perfect-kvm-vm --remote=torchio --name=testaroli \
    --release=bookworm \
    --mem=4G \
    --cpus=1 \
    --disk=block:/dev/drbd_testaroli \
    --disk=block:/dev/drbd_testaroli_vms \
    --nic=bridge:br0 \
    --nic=bridge:br1
create-perfect-kvm-vm --remote=torchio --name=pestaroli \
    --release=bookworm \
    --mem=4G \
    --cpus=1 \
    --disk=block:/dev/drbd_pestaroli \
    --disk=block:/dev/drbd_pestaroli_vms \
    --nic=bridge:br0 \
    --nic=bridge:br1

(As a reminder, br1 on torchio and fiori are on their replication network, but that network can also be used for testaroli and pestaroli!)

Complete Installing Debian 12 on a PM or KVM VM.
Complete Configuring virtualisation services (revision 5).

Journal

Allocate the second disk to vg1 for DRBD devices for VMs:
```
pvcreate /dev/vdb
vgcreate vg1 /dev/vdb
```
Make a DNS entry for a new container ‘condo’.

Create the one-legged DRBD device as follows (note the omission of --remote=<host> option):

create-perfect-drbd-vol -v --vg=vg1 --name=condo --size=5G \
    --name1=testaroli --ip1=192.168.3.31 --name2=pestaroli --ip2=192.168.3.32

and note the status of the resulting DRBD device:

testaroli# drbd-overview 
connection:Connecting: StandAlone Primary/Unknown UpToDate/Unknown NotEstablished
testaroli#

Now create a container (again, note the omission of --remote=<host> option):

create-basic-lxc-cnt --name=condo \
    --offset=100000 \
    --mem=1G \
    --disk=block:/dev/drbd_condo \
    --nic=bridge:br0 \
    --release=bookworm

Start the container (e.g. via virt-manager GUI).
Complete Installing Debian 12 on an LXC container with the default hardware.

Now add the second DRBD leg by copying over from testaroli to pestaroli /tmp/create-perfect-drbd-vol.<pid>.sh and running it on pestaroli:

testaroli# cd /tmp
testaroli# ls -lrt
...
testaroli# scp create-perfect-drbd-vol.5294.sh pestaroli:
create-perfect-drbd-vol.5294.sh 100% 721 653.1KB/s 00:00 
testaroli# ssh pestaroli
pestaroli# chmod 755 create-perfect-drbd-vol.5294.sh 
pestaroli# ./create-perfect-drbd-vol.5294.sh 
pestaroli# exit
logout
Connection to pestaroli closed.
testaroli#

and note the status of the resulting DRBD device:

testaroli# drbd-overview 
drbd_condo: Connected Primary/Secondary UpToDate/Inconsistent SyncSource(0.08%/0:59:31)
testaroli#

Copy over the container definition, which I don’t reproduce here as, when I migrate fiori and torchio, I’ll be copying over definitions of existing VMs, not new ones.

Introduction

Procedure

Journal

See also