Consul is a service discovery tool by hashicorp, it allows services/virtual machines to be registered to it and then provide dns and http interfaces to query on the state of the registered services/virtual machines. Prometheus contains built in integrations for many service discovery (SD) systems such as Consul, Kubernetes, and … Prometheus will scrape these metrics every 15 seconds (Well, you can configure that) and store them in the database. Finally, Consul can be configured to send telemetry data to a remote monitoring system. this is This telemetry information can be used for debugging or otherwise With Telemetry you can configure Consul for sending performance metrics to external tools/applications to monitor the performance of Consul. Let’s assume that there is a “node-exporter” service as in our example, this service can includes hundreds of instances from different teams. I have been using Ansible to generate the prometheus.yml configuration file, using variables to generate each section of the …
The operator must enable telemetry on the Nomad servers and clients as well as configure Prometheus to use Consul for service discovery. ; consul.cert-file: File path to a PEM-encoded certificate used with the private key to verify the exporter's authenticity. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.By clicking “Sign up for GitHub”, you agree to our The actual values show up there for ~10 seconds and then switch to NaN.This appears to be the normal behaviour for summaries in Prometheus: the sum and count are eternal, but the quantiles expire and afterwards only contain NaN. The “name” is the name of the metric field in Prometheus, in this case the name is consul_runtime. If you use Prometheus, you can use the /metrics endpoint for scraping metrics directly from the Ambassador admin port (:8877), or deploy the Prometheus StatsD Exporter as the statsd-sink service. The default for MaxAge in Prometheus is 10m, but for reasons not clear to me, in the go-metrics library used in Consul (that wraps the Prometheus client library), it's 10s:This means that you'd better use a scrape interval of 10s or less if you want to be able to capture quantile timings.Successfully merging a pull request may close this issue. About the why Prometheus and not doing this with Zabbix or other monitoring tool is an subject for maybe an other blogpost.One interesting application to monitor is Consul. You can check the supported exporters the link below.In Prometheus server, we need to specify targets(metric urls) in config file: “/etc/prometheus/prometheus.yaml ”After lots of researches and comparisons to overcome this challenge, we decided to use Consul Service Discovery to automate our monitoring systems.You can check the detailed configuration document in the link below.For example, to monitor an Elasticsearch service we need to install a node-exporter which serves at 9100 port as metric url and we need to modify the prometheus config file like this:In such use, we will need to update the targets when you add or remove each elasticsearch node. When you use Prometheus, you’ll use exporters for your applications or databases to expose the metrics for Prometheus.
One port on which the statsd is available for retrieving performance metrics (9125) and the other port (9102) is used for Prometheus to scrape these metrics.At this moment, I have added the following into the Prometheus configuration to let Prometheus scrape the statsd-exporter metrics:This works for now because I Ansible to generate a Prometheus configuration, but I’ll go probably using a consul_sd_config in the near future so I won’t have to add all kinds of static configuration.Once we have restarted Prometheus and started the statsd-exporter containers, I can see the following metrics appear in Prometheus:(And much more, but the above 3 are examples which are used as an explanation in the previous paragraphs. Gauges is a list of gauges which store one value that is updated as time goes on, such as the amount of memory allocated.
Implementing Custom Service Discovery Posted at: July 5, 2018 by Callum Styan Implementing Custom Service Discovery.