Rename roles to follow a readable schema

Give all roles a "float-" prefix to avoid collisions with user-defined
roles.

Separate Ansible roles into three main categories:

- *base* for the low-level mechanics of getting the machines ready
  to host services, provide service discovery, credentials, and other
  such mechanisms.

- *infra* for the configuration of services that are part of the
  float infrastructure but run on the base layer themselves

- *util* for internal utility roles

playbooks/all.yml

@@ -5,9 +5,9 @@
 
 - hosts: sso-server
   roles:
-    - sso-server
+    - float-infra-sso-server
 
 - hosts: user-meta-server
   roles:
-    - sso-server
+    - float-infra-sso-server
 

playbooks/base.yml

@@ -2,10 +2,10 @@
 
 - hosts: all
   roles:
-    - base
-    - float-credentials
-    - vagrant-compat
+    - float-base
+    - float-base-service-credentials
+    - float-util-vagrant-compat
 
 - hosts: net-overlay
   roles:
-    - net-overlay
+    - float-base-net-overlay

playbooks/docker.yml

@@ -2,7 +2,7 @@
 
 - hosts: all
   roles:
-    - docker
+    - float-base-docker
   serial:
     - 1
     - 2

playbooks/frontend.yml

@@ -4,19 +4,19 @@
 
 - hosts: frontend
   roles:
-    - nginx
-    - dns
-    - haproxy
+    - float-infra-nginx
+    - float-infra-dns
+    - float-infra-haproxy
 
 - hosts: admin-dashboard
   roles:
-    - admin-dashboard
+    - float-infra-admin-dashboard
 
 - hosts: acme
   roles:
-    - acme
+    - float-infra-acme
 
 - hosts: reports-collector
   roles:
-    - reports-collector
+    - float-infra-reports-collector
 

playbooks/infra.yml

@@ -14,9 +14,9 @@
 
 - hosts: log-collector
   roles:
-    - log-collector
+    - float-infra-log-collector
 
 - hosts: backup-metadata
   roles:
-    - backup-metadata
+    - float-base-backup-metadata
 

playbooks/prometheus-lts.yml

 - hosts: prometheus-lts
   roles:
-    - prometheus-lts
+    - float-infra-prometheus-lts
 
 # Configure 'thanos query' on 'prometheus' hosts to discover prometheus-lts
 - hosts: prometheus
   roles:
-    - thanos-query-lts
+    - float-infra-thanos-query-lts

playbooks/prometheus.yml

@@ -2,5 +2,5 @@
 
 - hosts: prometheus
   roles:
-    - prometheus
+    - float-infra-prometheus
 

playbooks/volumes.yml

@@ -2,5 +2,5 @@
 
 - hosts: all
   roles:
-    - volumemgr
+    - float-base-volumemgr
 

roles/README.md

+Roles in this directory all share a "float-" prefix to avoid collisions
+with user-defined roles. They are roughly grouped into sections:
+
+* *base* for the most low-level functionality, setting up the machines
+  and preparing them to run cointainers, along with distributing the
+  necessary credentials.
+
+* *infra* for roles meant to configure specific services that are part
+  of the wider float "infrastructure" (but with few exceptions run on
+  top of the *base* layer, i.e. within containers etc).
+
+* *util* for internal roles that are included by other roles, either to
+  expose common functionality to user roles (geoip, mariadb instances),
+  or to handle Ansible-related logic shared by multiple roles.
+
+