Asking for mmap to be extended

ct/elasticsearch.sh

@@ -76,7 +76,18 @@ function update_script() {
   exit
 }
 
+function ask_extend_mmap() {
+  read -r -p "Elasticsearch recommends extending the vm.max_map_count \n(https://www.elastic.co/guide/en/elasticsearch/reference/current/vm-max-map-count.html)? <y/N> " prompt
+  if [[ ${prompt,,} =~ ^(y|yes)$ ]]; then
+    msg_info "Extending mmap"
+    sysctl -w vm.max_map_count=262144
+    echo "vm.max_map_count=262144" >> /etc/sysctl.conf
+    msg_ok "Extended mmap"
+  fi
+}
+
 start
+ask_extend_mmap
 build_container
 description