add files

files/maybe-backup.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+backupdir="$1"
+file="dump_$(date "+%Y%m%d-%H%M%S").sql"
+
+docker exec -t postgres pg_dumpall -c -U maybe_user > "$backupdir/$file"
+

files/maybe-backup.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Schedule backups for maybe postgres
+
+[Timer]
+OnBootSec=600
+OnUnitActiveSec=36000
+
+[Install]
+WantedBy=multi-user.target

templates/maybe-backup.service.erb

@@ -0,0 +1,9 @@
+[Unit]
+Description=Run backup for maybe postgres
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/maybe-backup.sh <%= @datadir + '/backup' %>
+<% if @postgres_watchdog -%>
+ExecStartPost=/usr/bin/curl <%= @postgres_watchdog %>
+<% end -%>