Created Development Setup (Linux) (markdown)

Development-Setup-(Linux).md

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+# High-Level Overview
+
+* Libvirt + QEMU + KVM
+* 2 long-lived Ubuntu VMs on a bridged network, accsessible from the host
+* Develop & build zrepl on the host
+* Use a script to `scp` built binaries into the guest
+
+## Creating The VMs
+
+(This section is copy-pasted from some notes and likely imperfect, feel free to amend)
+
+Prepare disk images:
+
+```
+cd /var/lib/libvirt/images
+wget 'https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img'
+qemu-img convert jammy-server-cloudimg-amd64.img ubuntu-2204.qcow2
+cp ubuntu-2204.qcow2 zrepl-2-ubuntu-2204.qcow2
+cp ubuntu-2204.qcow2 zrepl-1-ubuntu-2204.qcow2
+qemu-img resize zrepl-2-ubuntu-2204.qcow2 +10G
+qemu-img resize zrepl-1-ubuntu-2204.qcow2 +10G
+virt-customize -a zrepl-1-ubuntu-2204.qcow2 --hostname zrepl-1-2204 --root-password password:""          
+virt-customize -a zrepl-2-ubuntu-2204.qcow2 --hostname zrepl-2-2204 --root-password password:""          
+```
+
+Start VMs.
+
+Setup SSH using `ssh-copy-id` or similar.
+
+**From here on, inside each VM**
+
+```
+mkdir /etc/zrepl
+ln -s /opt/zrepl /usr/bin/zrepl
+# we'll later scp the binaries built on the host to /opt/zrepl
+```
+
+Create zpool `p1` 
+
+```
+dd if=/dev/zero of=/pool.img bs=1M count=1024 status=progress
+poolname=p1
+# for unencrypted pool
+sudo zpool create -f $poolname /pool.img
+# for encrypted pool
+echo foobar2342 > /pool.key && sudo zpool create -f -O encryption=on -O keyformat=passphrase -O keylocation=file:///pool.key $poolname /pool.img
+```
+