Modify libvirt port range for live-migration

By default, libvirtd uses ports 49152 to 49215 for live-migration,
as specified in qemu.conf

Since these ports is subset to ephemeral port range, which is from
32768 to 61000 for linux, it can be consumed by any other service
as well. It causes live-migration to fail, with below error:

Live Migration failure: internal error: Unable to find an unused
port in range 'migration' (49152-49215)

Using port range out of ephemeral port range.

Change-Id: I2039eca87c11638faf6262259b7bcface982f5c6
(cherry picked from commit 3da3f5d8de)

puppet/services/nova-libvirt.yaml

@@ -210,12 +210,14 @@ outputs:
             nova::compute::libvirt::qemu::max_files: 32768
             nova::compute::libvirt::qemu::max_processes: 131072
             nova::compute::libvirt::vncserver_listen: {get_param: [ServiceNetMap, NovaLibvirtNetwork]}
+            nova::migration::qemu::migration_port_min: 61152
+            nova::migration::qemu::migration_port_max: 61215
             rbd_persistent_storage: {get_param: CinderEnableRbdBackend}
             tripleo.nova_libvirt.firewall_rules:
               '200 nova_libvirt':
                 dport:
                   - 16514
-                  - '49152-49215'
+                  - '61152-61215'
                   - '5900-6923'
 
           -

releasenotes/notes/live_migration_port_range-54c28faf0a67a3fc.yaml

@@ -0,0 +1,11 @@
+---
+fixes:
+  - |
+    By default, libvirtd uses ports from 49152 to 49215 for live-migration
+    as specified in qemu.conf, that becomes a subset of ephemeral ports
+    (from 32768 to 61000) used by many linux kernels.
+    The issue here is that these ephemeral ports are used for outgoing TCP
+    sockets. And live-migration might fail, if there are no port available
+    from the specified range.
+    Moving the port range out of ephemeral port range to be used only for
+    live-migration.