WIP Add KVM host backup recipe
Add a recipe that configures scripts for live backups of VM images via libvirt and borg.
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#!/bin/bash
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# GENERATED BY CHEF
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# DO NOT EDIT
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set -e
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REPOSITORY=$BORG_REPO
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echo "Starting backup of VM: $1"
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echo "Dumping domain XML to /root/backups/vm_meta/$1.xml"
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virsh dumpxml --migratable $1 > /root/backups/vm_meta/$1.xml
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virsh snapshot-create-as --domain $1 \
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--name hotswap.qcow2 \
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--no-metadata \
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--atomic \
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--quiesce \
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--disk-only \
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--diskspec vda,snapshot=external
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borg create -v --stats \
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$REPOSITORY::$1_$(date +%F_%H-%M) \
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/var/lib/libvirt/images/$1.qcow2 \
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/root/backups/vm_meta
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echo "Pivoting base image back to original"
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virsh blockcommit $1 vda --pivot --base=/var/lib/libvirt/images/$1.qcow2
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echo "Removing snapshot image"
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rm /var/lib/libvirt/images/$1.hotswap.qcow2
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#
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# Cookbook:: kosmos_kvm
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# Recipe:: backup
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#
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apt_package "borgbackup"
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borg_credentials = data_bag_item("credentials", "borg")
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file "/root/.ssh/borg_rsa" do
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content borg_credentials["ssh_key"]
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mode '0600'
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end
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bash "Add borg environment variables for bash" do
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code <<-EOF
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cat >>/root/.bashrc <<EOL
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# GENERATED BY CHEF
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export BORG_RSH='ssh -i /root/.ssh/borg_rsa'
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export BORG_PASSPHRASE=#{borg_credentials["passphrase"]}
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export BORG_REPO='#{borg_credentials["repository"]}'
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EOF
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not_if "grep -q BORG /root/.bashrc"
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end
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cookbook_file "/root/backups/backup_vm.sh" do
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source "backup_vm.sh"
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mode "0750"
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end
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# Search all guests and filter by presence on current host
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vm_domains = search(:node, "role:kvm_guest").map(&:name) \
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& `virsh list --name`.strip.chomp.split("\n")
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template "/root/backups/backup_all_vms.sh" do
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source "backup_all_vms.sh.erb"
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mode '0750'
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variables vm_domains: vm_domains
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end
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#!/bin/bash
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# GENERATED BY CHEF
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# DO NOT EDIT
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set -e
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echo "Backing up all VMs with kvm_guest chef role..."
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for domain in <%= @vm_domains.join(" ") %>
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do
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/root/backups/backup_vm.sh $domain
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done
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