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diff --git a/examples/rgw/lua/prometheus_adapter.md b/examples/rgw/lua/prometheus_adapter.md new file mode 100644 index 000000000..eae1d8151 --- /dev/null +++ b/examples/rgw/lua/prometheus_adapter.md @@ -0,0 +1,59 @@ +# Introduction + +This directory contains an example `prometheus_adapter.lua` on how to +use [Lua Scripting](https://docs.ceph.com/en/latest/radosgw/lua-scripting/) +to push metrics from the RGW requests to [Prometheus](https://prometheus.io/), +specifically to collect information on object sizes. + +## Prometheus + +As every single run of a lua script is short-lived, +so [Pushgateway](https://github.com/prometheus/pushgateway) +should be used as an intermediate service to enable Prometheus to scrape data +from RGW. + +* Install and run Pushgateway using docker: + +```bash +docker pull prom/pushgateway +docker run -p 9091:9091 -it prom/pushgateway +``` + +* Install and run Prometheus using docker: + +```bash +docker pull prom/prometheus +docker run --network host -v ${CEPH_DIR}/examples/lua/config/prometheus.yml:/etc/prometheus/prometheus.yml prom/prometheus +``` + +[Full documentation for Prometheus installation](https://prometheus.io/docs/prometheus/latest/installation/) + +## Usage + +* Upload the script: + +```bash +radosgw-admin script put --infile=prometheus_adapter.lua --context=postRequest +``` + +* Add the packages used in the script: + +```bash +radosgw-admin script-package add --package='luasocket' --allow-compilation +``` + +* Restart radosgw. + +* Send a request: +```bash +s3cmd --host=localhost:8000 --host-bucket="localhost:8000/%(bucket)" --access_key=0555b35654ad1656d804 --secret_key=h7GhxuBLTrlhVUyxSPUKUV8r/2EI4ngqJxD7iBdBYLhwluN30JaT3Q== mb s3://mybucket +s3cmd --host=localhost:8000 --host-bucket="localhost:8000/%(bucket)" --access_key=0555b35654ad1656d804 --secret_key=h7GhxuBLTrlhVUyxSPUKUV8r/2EI4ngqJxD7iBdBYLhwluN30JaT3Q== put -P /etc/hosts s3://mybucket +curl http://localhost:8000/mybucket/hosts +``` + +* Open `http://localhost:9090` by browser and search for `rgw_request_content_length` + + +## Requirements +* Lua 5.3 or higher + |