check_memory

# Requires check_mem.pl — bundled in nagios-plugins-contrib on Debian/Ubuntu,
# or download from https://exchange.nagios.org/

# Define the command in commands.cfg:
define command {
    command_name  check_memory
    command_line  $USER1$/check_mem.pl -w $ARG1$ -c $ARG2$
}

# Use in a service definition:
define service {
    use                   generic-service
    host_name             web-01
    service_description   Memory Usage
    check_command         check_memory!80!95
    # Warn at 80% memory used, critical at 95%
}