VictoriaMetrics is a free [open source time series database](https://en.wikipedia.org/wiki/Time_series_database) (TSDB) and monitoring solution, designed to collect, store and process real-time metrics.
It supports the [Prometheus](https://en.wikipedia.org/wiki/Prometheus_(software)) pull model and various push protocols ([Graphite](https://en.wikipedia.org/wiki/Graphite_(software)), [InfluxDB](https://en.wikipedia.org/wiki/InfluxDB), OpenTSDB) for data ingestion. It is optimized for storage with high-latency IO, low IOPS and time series with [high churn rate](https://docs.victoriametrics.com/faq/#what-is-high-churn-rate).
For reading the data and evaluating alerting rules, VictoriaMetrics supports the PromQL, [MetricsQL](https://docs.victoriametrics.com/metricsql/) and Graphite query languages. VictoriaMetrics Single is fully autonomous and can be used as a long-term storage for time series.
[VictoriaMetrics Single](https://docs.victoriametrics.com/single-server-victoriametrics/) = Hassle-free monitoring solution. Easily handles 10M+ of active time series on a single instance. Perfect for small and medium environments.
This One Click app uses 8428, 2003, 4242 and 8089 ports to accept metrics from different protocols. It's recommended to disable ports for protocols which are not needed. [Ubuntu firewall](https://help.ubuntu.com/community/UFW) can be used to easily disable access for specific ports.
VictoriaMetrics supports metrics scraping in the same way as Prometheus does. Check the configuration file to edit scraping targets. See more details about scraping at [How to scrape Prometheus exporters](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-scrape-prometheus-exporters-such-as-node-exporter).
- [Datadog](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-send-data-from-datadog-agent), [Influx (telegraph)](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-send-data-from-influxdb-compatible-agents-such-as-telegraf), [JSON](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-import-data-in-json-line-format), [CSV](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-import-csv-data), [Prometheus](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-import-data-in-prometheus-exposition-format) on port :8428
- [Graphite (statsd)](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-send-data-from-graphite-compatible-agents-such-as-statsd) on port :2003 tcp/udp
- [OpenTSDB](https://docs.victoriametrics.com/single-server-victoriametrics/#how-to-send-data-from-opentsdb-compatible-agents) on port :4242
VictoriaMetrics provides a [User Interface (UI)](https://docs.victoriametrics.com/single-server-victoriametrics/#vmui) for query troubleshooting and exploration. The UI is available at `http://your_droplet_public_ipv4:8428/vmui`. It lets users explore query results via graphs and tables.
To check it, open the following in your browser `http://your_droplet_public_ipv4:8428/vmui` and then enter `vm_app_uptime_seconds` to the Query Field to Execute the Query.
Run the following command to query and retrieve a result from VictoriaMetrics Single with `curl`:
