metricbeat: update kvm module defaults

The default settings for the kvm module didn't work.

Updated to connect to the unix socket by default, and provide a hint on
how to setup access to libvirtd running on remote hosts.

metricbeat/docs/modules/kvm.asciidoc

@@ -24,7 +24,10 @@ metricbeat.modules:
   metricsets: ["dommemstat"]
   enabled: true
   period: 10s
-  hosts: ["localhost"]
+  hosts: ["unix:///var/run/libvirt/libvirt-sock"]
+  # For remote hosts, setup network access in libvirtd.conf
+  # and use the tcp scheme:
+  # hosts: [ "tcp://<host>:16509" ]
 
   # Timeout to connect to Libvirt server
   #timeout: 1s

metricbeat/metricbeat.reference.yml

@@ -423,7 +423,10 @@ metricbeat.modules:
   metricsets: ["dommemstat"]
   enabled: true
   period: 10s
-  hosts: ["localhost"]
+  hosts: ["unix:///var/run/libvirt/libvirt-sock"]
+  # For remote hosts, setup network access in libvirtd.conf
+  # and use the tcp scheme:
+  # hosts: [ "tcp://<host>:16509" ]
 
   # Timeout to connect to Libvirt server
   #timeout: 1s

metricbeat/module/kvm/_meta/config.reference.yml

@@ -2,7 +2,10 @@
   metricsets: ["dommemstat"]
   enabled: true
   period: 10s
-  hosts: ["localhost"]
+  hosts: ["unix:///var/run/libvirt/libvirt-sock"]
+  # For remote hosts, setup network access in libvirtd.conf
+  # and use the tcp scheme:
+  # hosts: [ "tcp://<host>:16509" ]
 
   # Timeout to connect to Libvirt server
   #timeout: 1s

metricbeat/module/kvm/_meta/config.yml

@@ -2,4 +2,4 @@
   #metricsets:
   #  - dommemstat
   period: 10s
-  hosts: ["localhost"]
+  hosts: ["unix:///var/run/libvirt/libvirt-sock"]

metricbeat/modules.d/kvm.yml.disabled

@@ -5,4 +5,4 @@
   #metricsets:
   #  - dommemstat
   period: 10s
-  hosts: ["localhost"]
+  hosts: ["unix:///var/run/libvirt/libvirt-sock"]