[keepalived] Install keepalived from buster-backports to avoid segfaults

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/keepalived/tasks/main.yml

@@ -1,4 +1,25 @@
 ---
+- name: Add buster-backports to apt sources
+  apt_repository:
+    repo: deb {{ debian_mirror }} buster-backports main
+    state: present
+  when:
+    - ansible_distribution == "Debian"
+    - ansible_distribution_major_version | int == 10
+    - ansible_distribution_release == "buster"
+
+- name: Use buster-backports to install keepalived
+  template:
+    src: apt/preferences.d/keepalived.j2
+    dest: apt/preferences.d/keepalived
+    owner: root
+    group: root
+    mode: 0644
+  when:
+    - ansible_distribution == "Debian"
+    - ansible_distribution_major_version | int == 10
+    - ansible_distribution_release == "buster"
+
 - name: Install keepalived
   apt:
     update_cache: true

roles/keepalived/templates/apt/preferences.d/keepalived.j2

@@ -0,0 +1,7 @@
+{{ ansible_header | comment }}
+
+
+Package: keepalived
+Pin: release n=buster-backports
+Pin-Priority: 900
+