Jovan Stosic
Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4KB to a client app.
Source: Firebase Cloud Messaging
Jovan Stosic
- Add Nagios user:
htpasswd /usr/local/nagios/etc/htpasswd.users joe_user
- update passwd:
htpasswd /usr/local/nagios/etc/htpasswd.users joe_user
- delete user:htpasswd -D /usr/local/nagios/etc/htpasswd.users joe_userSource: Creating user IDs and passwords for the Nagios Core web interface
Jovan Stosic
define host{
use linux-server
host_name email-server
alias Corporate Email Server
address 192.168.1.14
contact_groups unix-admins
}
Source: 4 Steps to Define Nagios Contacts With Email and Pager Notification
Jovan Stosic
Nagios-Status-JSON
Jovan Stosic
In computer networking, xinetd (Extended Internet Service Daemon) is an open-source super-server daemon, runs on many Unix-like systems and manages Internet-based connectivity.
It offers a more secure alternative to the older inetd (“the Internet daemon”), which most modern Linux distributions have deprecated.
xinetd listens for incoming requests over a network and launches the appropriate service for that request. Requests are made using port numbers as identifiers and xinetd usually launches another daemon to handle the request. It can be used to start services with both privileged and non-privileged port numbers.
xinetd features access control mechanisms such as TCP Wrapper ACLs, extensive logging capabilities, and the ability to make services available based on time. It can place limits on the number of servers that the system can start, and has deployable defense mechanisms to protect against port scanners, among other things.
On some implementations of Mac OS X, this daemon starts and maintains various Internet-related services, including FTP and telnet. As an extended form of inetd, it offers enhanced security. It replaced inetd in Mac OS X v10.3, and subsequently launchd replaced it in Mac OS X v10.4. However, Apple has retained inetd for compatibility purposes.
Source: xinetd – Wikipedia
Jovan Stosic
Jovan Stosic
efine command{
command_name check_nrpe_lb
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -p $_HOSTTCPORT$
}
define host{
use linux-remote
host_name WS1
address 1.1.1.1
_tcport 5667
}
define service{
use generic-service,srv-pnp
host_name WS1
service_description Server Load
check_command check_nrpe_lb!check_load
}
Source: remote NRPE help on different port – View topic • Nagios Support Forum
Jovan Stosic
Jovan Stosic
Jovan Stosic
Jovan Stosic
Lf261
Jovan Stosic
sudo apt-get install libssl-dev