diff --git a/cookbooks/prometheus/alertmanager_setup.rb b/cookbooks/prometheus/alertmanager_setup.rb
new file mode 100644
index 0000000..6965083
--- /dev/null
+++ b/cookbooks/prometheus/alertmanager_setup.rb
@@ -0,0 +1,49 @@
+# Create `/etc/prometheus.d/alerts`:
+%w(/etc/prometheus.d/alerts).each do |d|
+  directory d do
+    owner  'root'
+    group  'root'
+    mode   '0755'
+  end
+end
+
+# Deploy `alertmanager` file:
+remote_file '/etc/prometheus.d/alertmanager.yml' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+
+  notifies :restart, 'service[supervisor]'
+end
+
+# Deploy alert setting file:
+remote_file '/etc/prometheus.d/alerts/resource.yml' do
+  owner  'root'
+  group  'root'
+  mode   '644'
+
+  notifies :restart, 'service[supervisor]'
+end
+
+# Restart the `supervisor`:
+service 'supervisor' do
+  action :nothing
+end
+
+# Firewall settings here:
+%w( 9093/tcp ).each do |p|
+  execute "ufw allow #{p}" do
+    user 'root'
+
+    not_if "LANG=c ufw status | grep #{p}"
+
+    notifies :run, 'execute[ufw reload-or-enable]'
+  end
+end
+
+execute 'ufw reload-or-enable' do
+  user 'root'
+  command 'LANG=C ufw reload | grep skipping && ufw --force enable || exit 0'
+
+  action :nothing
+end