use bbr for tcp congestion control

tasks/post_install.yml

@@ -65,13 +65,7 @@
   - /etc/ipset.d/blocklist4
   - /etc/ipset.d/blocklist6
   - /etc/syslog-ng/syslog-ng.conf
-- name: "Create NTP directories."
+  - /etc/sysctl.d/congestion.conf
-  file:
-    state: "directory"
-    path: "{{ item }}"
-  loop:
-  - "/var/NTP"
-  - "/var/lib/ntp"
 - name: "And services."
   template:
     src: "templates/{{ item }}.j2"
@@ -79,5 +73,12 @@
     mode: "750"
   loop:
   - /etc/init.d/ntpd
+- name: "Create NTP directories."
+  file:
+    state: "directory"
+    path: "{{ item }}"
+  loop:
+  - "/var/NTP"
+  - "/var/lib/ntp"
 - name: "Reboot!"
   reboot:

templates/etc/sysctl.d/congestion.conf

@@ -0,0 +1 @@
+net.ipv4.tcp_congestion_control=bbr