Set up systemd service and timer for backups

nodes/draco.kosmos.org.json

@@ -3,6 +3,11 @@
   "normal": {
     "knife_zero": {
       "host": "10.1.1.167"
+    },
+    "kosmos_kvm": {
+      "backup": {
+        "schedule": "0/3:45"
+      }
     }
   },
   "automatic": {

nodes/fornax.kosmos.org.json

@@ -3,6 +3,11 @@
   "normal": {
     "knife_zero": {
       "host": "10.1.1.147"
+    },
+    "kosmos_kvm": {
+      "backup": {
+        "schedule": "0/3:00"
+      }
     }
   },
   "automatic": {

site-cookbooks/kosmos_kvm/attributes/default.rb

@@ -5,3 +5,6 @@ node.default["kosmos_kvm"]["host"]["qemu_base_image"] = {
   "checksum" => "6db74917f85146569cb6ae89e1d163ac6d1e488a7f32bc74761ec6d1869c714f",
   "path" => "/var/lib/libvirt/images/base/ubuntu-20.04-server-cloudimg-amd64-disk-kvm-#{ubuntu_server_cloud_image_release}.qcow2"
 }
+
+# A systemd.timer OnCalendar config value
+node.default["kosmos_kvm"]["backup"]["schedule"] = "daily"

site-cookbooks/kosmos_kvm/recipes/backup.rb

@@ -54,3 +54,39 @@ template "/root/backups/backup_all_vms.sh" do
   mode '0750'
   variables vm_domains: vm_domains
 end
+
+systemd_unit "backup-libvirt-guests.service" do
+  content({
+    Unit: {
+      Description: "Back up libvirt guest images and metadata",
+      Wants: "network.target"
+    },
+    Service: {
+      Type: "oneshot",
+      EnvironmentFile: "/root/.borg_credentials.env",
+      ExecStart: "/root/backups/backup_all_vms.sh",
+      SyslogIdentifier: "backup-libvirt-guests",
+      Restart: "no"
+    }
+  })
+  verify false
+  triggers_reload true
+  action [:create]
+end
+
+systemd_unit "backup-libvirt-guests.timer" do
+  content({
+    Unit: {
+      Description: "Back up libvirt guest images and metadata",
+    },
+    Timer: {
+      OnCalendar: node["kosmos_kvm"]["backup"]["schedule"]
+    },
+    Install: {
+      WantedBy: "timers.target"
+    }
+  })
+  verify false
+  triggers_reload true
+  action [:create, :enable, :start]
+end