Why doesn't OneAgent start to monitor Apache process after restart?

adham_sabry — Wed, 02 Nov 2022 07:45:21 GMT

Following installation of OneAgent, your Apache web server must be completely restarted to enable monitoring. To do this correctly, it's important to understand the difference between "partial" and "complete" restarts. In the case of partial restarts, the main Apache process re-reads its configuration files, re-opens its log files, and then restarts its worker processes. OneAgent however, requires a complete Apache web server restart in which all workers and—most importantly—the main Apache process are shut down entirely and then restarted.

See Stopping and Restarting Apache HTTP Server for more information on the different types of available restarts.

To perform a complete restart:

Linux and AIX
- You may be accustomed to restarting Apache by issuing an
```
apachectl restart
```
  command. However, this command only results in a partial Apache restart.
- To execute a complete Apache restart and enable deep monitoring with Dynatrace OneAgent, you need to first invoke a complete shutdown using the
```
apachectl stop
```
  command. Only following this step can you restart the server using
```
apachectl start
```
- It's fine to use
```
service apache2 restart
```
  on Ubuntu systems. Note however that whatever commands you use, you'll likely need superuser rights (sudo).
Windows
- On Windows, you can either use the built-in Windows Service Management or Apache Service Monitor (httpd.exe) to restart Apache services. Restarting the Apache service with Windows Service Management guarantees the complete restart. With httpd.exe, you may be accustomed to restarting Apache by issuing a
```
httpd.exe -k restart -n "Apache2.4"
```
  command. However, this command only results in a partial Apache restart.
- To execute a complete Apache restart and enable deep monitoring with OneAgent, you need to first invoke a complete shutdown using the
```
httpd.exe -k stop -n "Apache2.4"
```
  command. Only following this step can you restart the server using
```
httpd.exe -k start -n "Apache2.4".
```

Re: Why doesn't OneAgent start to monitor Apache process after restart?

ChadTurner — Tue, 10 Jan 2023 15:08:08 GMT

And if all else fails, restart the entire box 🤣 Thanks @adham_sabry for providing clarity on this issue and the solutions that are available to us 🙂

article Why doesn't OneAgent start to monitor Apache process after restart? in Troubleshooting

Why doesn't OneAgent start to monitor Apache process after restart?

Re: Why doesn't OneAgent start to monitor Apache process after restart?