Nagios

Nagios is one of the most used tools for controlling the status of services and servers. Nagios is capable of regularly auditing the state of servers and services, and notifying users in case of problems. If you have Nagios in your environment, you need to be very careful when you administer your machines, because in cases where Nagios finds servers or services in an unhealthy state, it will start sending e-mails, SMS messages, and calls to your whole team. When you run Ansible scripts against nodes that are controlled by Nagios you have to be even more careful, because you risk e-mails, SMS messages, and calls being triggered during the night or other inappropriate times. To avoid this, Ansible is able to notify Nagios beforehand, so that Nagios does not send notifications in that time window even if some services are down (for instance, because they are rebooted) or other checks fail.

In this example, we are going to stop a service, wait for 5 minutes, then start it again since this...