====== Ubuntu - SystemD - Accounting ======

Systemd allows you to check how much CPU and Memory is used by a service and how many tasks are running by the service.

  * Many recent Linux distros enable accounting by default.
  * On old Linux distros like Ubuntu 18.04, you need to manually enable accounting.

----

===== Example =====

To enable accounting for Nginx on Ubuntu 18.04.

==== Create a directory to store the custom systemd configuration for this service ====

<code bash>
sudo mkdir -p /etc/systemd/system/nginx.service.d/
</code>

----

==== Create the custom config file under this directory ====

<code bash>
sudo vi /etc/systemd/system/nginx.service.d/custom.conf
</code>

<WRAP info>
**NOTE:**  The filename extension must be .conf.
</WRAP>

...add the following lines in this file.

<file bash>
[Service]
CPUAccounting=true
MemoryAccounting=true
TasksAccounting=true
</file>

----

==== Reload systemd ====

<code bash>
sudo systemctl daemon-reload
</code>

----

<WRAP info>
**NOTE:**  There is no need to restart Nginx.
</WRAP>

----

==== Check Nginx status ====

<code bash>
systemctl status nginx
</code>

<WRAP info>
**NOTE:**  This should show Tasks, Memory and CPU information.
</WRAP>