graylog: Add PB to deploy Graylog server

The `graylog.yml` playbook installs Elasticsearch, MongoDB, and Graylog
on a single machine.

graylog.yml

@@ -0,0 +1,32 @@
+- hosts: graylog
+  name: setup mongodb
+  roles:
+  - mongodb
+  tasks:
+  - name: ensure mongodb is running
+    service:
+      name=mongod
+      state=started
+
+- hosts: graylog
+  name: setup elasticsearch
+  roles:
+  - elasticsearch
+  tasks:
+  - name: ensure elasticsearch is running
+    service:
+      name=elasticsearch
+      state=started
+
+- hosts: graylog
+  name: setup graylog
+  vars_files:
+    vault/graylog/{{ inventory_hostname }}
+  roles:
+  - apache
+  - graylog
+  tasks:
+  - name: ensure graylog is running
+    service:
+      name=graylog-server
+      state=started

hosts

@@ -43,6 +43,8 @@ file0.pyrocufflink.blue
 [gitea]
 git0.pyrocufflink.blue
 
+[graylog]
+
 [home-assistant]
 hass0.pyrocufflink.blue