diff --git a/prometheus/defaults/main.yml b/prometheus/defaults/main.yml
index f0bd08d7..0d833c86 100644
--- a/prometheus/defaults/main.yml
+++ b/prometheus/defaults/main.yml
@@ -11,3 +11,4 @@ prometheus_confdir: '/opt/prometheus/conf'
 prometheus_cmd: '{{ prometheus_dist_dir }}/{{ prometheus_dir }}/prometheus'
 prometheus_loglevel: info
 prometheus_http_port: 9090
+prometheus_opts: '--storage.tsdb.retention=120d'
diff --git a/prometheus/files/prometheus.upstart b/prometheus/files/prometheus.upstart
index 6f74610b..3c75a2c8 100644
--- a/prometheus/files/prometheus.upstart
+++ b/prometheus/files/prometheus.upstart
@@ -15,6 +15,7 @@ script
   export PROMETHEUS_DATADIR
   export PROMETHEUS_LOGLEVEL
   export PROMETHEUS_CONF
-  exec $PROMETHEUS_CMD --config.file=$PROMETHEUS_CONF --storage.tsdb.path="$PROMETHEUS_DATADIR" --log.level=$PROMETHEUS_LOGLEVEL > $PROMETHEUS_LOGDIR/prometheus.log 2>&1
+  export PROMETHEUS_OPTS
+  exec $PROMETHEUS_CMD --config.file=$PROMETHEUS_CONF --storage.tsdb.path="$PROMETHEUS_DATADIR" --log.level=$PROMETHEUS_LOGLEVEL $PROMETHEUS_OPTS > $PROMETHEUS_LOGDIR/prometheus.log 2>&1
 end script
  
\ No newline at end of file
diff --git a/prometheus/templates/prometheus.default.j2 b/prometheus/templates/prometheus.default.j2
index bef6b306..23fe2660 100644
--- a/prometheus/templates/prometheus.default.j2
+++ b/prometheus/templates/prometheus.default.j2
@@ -4,5 +4,6 @@ PROMETHEUS_LOGDIR={{ prometheus_home }}/logs
 PROMETHEUS_DATADIR={{ prometheus_home }}/data
 PROMETHEUS_LOGLEVEL={{ prometheus_loglevel }}
 PROMETHEUS_CONF={{ prometheus_confdir }}/prometheus.yml
+PROMETHEUS_OPTS="{{ prometheus_opts }}"