Learn about the Wavefront Apache HTTP Integration.

Apache HTTP Server Integration

The Apache HTTP Server is a popular open source web server. This integration installs and configures Telegraf to send Apache HTTP Server metrics to Wavefront. Telegraf is a light-weight server process capable of collecting, processing, aggregating, and sending metrics to a Wavefront proxy.

In addition to setting up the metrics flow, this integration also sets up a dashboard.

images/apache-dashboard-1.png

images/apache-dashboard-2.png

images/apache-dashboard-3.png

To see a list of the metrics for this integration, select the integration from https://github.com/influxdata/telegraf/tree/master/plugins/inputs.

Apache HTTP Server Setup

Note: This integration is supported with Apache HTTP version 2.4.33 and later.

Step 1. Install the Telegraf Agent

This integration uses the Apache input plugin for Telegraf. If you’ve already installed Telegraf on your server(s), you can skip to Step 2.

Log in to your Wavefront instance and follow the instructions in the Setup tab to install Telegraf and a Wavefront proxy in your environment. If a proxy is already running in your environment, you can select that proxy and the Telegraf install command connects with that proxy. Sign up for a free trial to check it out!

Step 2. Enable the Apache HTTP Server “mod_status”

This integration requires the Apache HTTP Server “mod_status” to be enabled on the Apache HTTP Server.

<Location "/server-status">
    SetHandler server-status
</Location>

Step 3. Configure the Telegraf Apache Input Plugin

Create a file called apache.conf in /etc/telegraf/telegraf.d.

To specify one or more urls to gather metrics from, use urls:

[[inputs.apache]]
  urls = ["http://<ip>:<port>/server-status?auto"]

urls is an array of URLs. Default is http://localhost/server-status?auto. Example:

  urls = ["http://localhost/server-status?auto",
          "http://localhost:8080/server-status?auto"]

To use credentials for basic HTTP authentication use username and password.Example:

username = <user>
password = <password>

To change the maximum time to receive a response use response_timeout. Example:

response_timeout = "<time>s"

To use optional SSL configuration parameters, use the properties in the following example:

ssl_ca = "/etc/telegraf/ca.pem"
ssl_cert = "/etc/telegraf/cert.pem"
ssl_key = "/etc/telegraf/key.pem"
# Use SSL but skip chain & host verification
insecure_skip_verify = false

Step 4. Restart Telegraf

Run sudo service telegraf restart to restart the Telegraf agent.

Metrics

Information about server activity and performance. Metrics descriptions are collected from the mod_status Apache Module.

Metric Name Description
apache.BusyWorkers Number of workers that are serving requests.
apache.BytesPerReq Number of bytes per request.
apache.BytesPerSec Number of bytes transferred per second.
apache.CPUChildrenSystem Jiffs used in User Mode by child processes.
apache.CPUChildrenUser Jiffs used in System Mode by child processes.
apache.CPULoad CPU load of your HTTP server.
apache.CPUSystem CPU processes in System mode.
apache.CPUUser CPU used by the user process.
apache.ConnsAsyncClosing Number of asynchronous connections that are closing.
apache.ConnsAsyncKeepAlive Number of asynchronous connections that are kept alive.
apache.ConnsAsyncWriting Number of asynchronous connections that are writing.
apache.ConnsTotal Total number of connections served by Apache.
apache.IdleWorkers Number of workers that are idling.
apache.Load1 Server load over last 1 minute.
apache.Load15 Server load over last 15 minutes.
apache.Load5 Server load over last 5 minutes.
apache.ParentServerConfigGeneration Number of times the Apache server reread config and restarted child processes.
apache.ParentServerMPMGeneration Number of times the Apache server reread the MPG config and restarted child processes.
apache.ReqPerSec Number of requests per second.
apache.ServerUptimeSeconds Server uptime (in seconds).
apache.TotalAccesses Total number of accesses.
apache.TotalkBytes Number of kilobytes served.
apache.Uptime Total uptime of the server.
apache.accesses.total.counter Total number of times this server was accessed.
apache.cpuload.gauge CPU load for this server.
apache.exporter.build.info.gauge  
apache.scboard.closing Number of worker threads that are closing a TCP connection (after serving a response).
apache.scboard.dnslookup Number of worker threads currently performing a DNS lookup.
apache.scboard.finishing Number of worker threads finishing (part of server shutdown).
apache.scboard.idle.cleanup Number of idle worker threads that are ready for cleanup.
apache.scboard.keepalive Number of worker threads that keep the connection alive (expecting another request on the same connection).
apache.scboard.logging Number of worker threads writing to the log file.
apache.scboard.open Number of open worker slots.
apache.scboard.reading Number of workers receiving requests.
apache.scboard.sending Number of workers sending responses.
apache.scboard.starting Number of workers in the process of starting.
apache.scboard.waiting Number of workers waiting for incoming requests.
apache.scoreboard.gauge Scoreboard gauge.
apache.sent.kilobytes.total.counter Total number of kilobytes sent.
apache.up.gauge Shows whether server could be reached.
apache.uptime.seconds.total.counter Total uptime, in seconds.
apache.workers.gauge Apache worker status.