DenyAll SNMP

Monitoring Connector Assets

Monitored Objects

The Monitoring Connector DenyAll SNMP collects metrics for:

Cpu
Interfaces
Load
Memory
Reverse-Proxy
Storage
Swap

Collected Metrics

Metric name	Description	Unit
cpu.utilization.percentage	CPU utilization	%
cpuid#core.cpu.utilization.percentage	Per Core CPU utilization	%

Metric name	Description	Unit
status	Status of the interface
interface_name#interface.traffic.in.bitspersecond	Incoming traffic going through the interface.	b/s
interface_name#interface.traffic.in.percentage	Percentage of the interface's in bandwidth usage	%
interface_name#interface.traffic.out.bitspersecond	Outgoing traffic going through the interface.	b/s
interface_name#interface.traffic.out.percentage	Percentage of the interface's out bandwidth usage	%

A regexp filter is available to target a specific interface identifier - ifName [--interface='^eth0$' --name]

Metric name	Description	Unit
load1	System load 1 minute-sample
load5	System load 5 minutes-sample
load15	System load 15 minutes-sample

Metric name	Description	Unit
memory.usage.bytes	Memory usage	B
memory.free.bytes	Free memory	B
memory.usage.percentage	Memory usage in percentage	%
memory.buffer.bytes	Buffered Memory allocation	B
memory.cached.bytes	Cached Memory allocation	B
memory.shared.bytes	Shared Memory allocation	B

Metric name	Description	Unit
status	Status of the reverse proxy
reverseproxy_uid#reverse_proxy.cpu.utilization.percentage	CPU utilization	%
reverseproxy_uid#reverse_proxy.memory.usage.bytes	Memory usage	B
reverseproxy_uid#reverse_proxy.requests.persecond	Number of requests per second

Metric name	Description	Unit
storage.partitions.count	Number of disk partition
partition_path#storage.space.usage.bytes	Used space on a disk partition	B

Metric name	Description	Unit
swap.usage.bytes	Used swap	B
swap.free.bytes	Free swap	B
swap.usage.percentage	Percentage of used swap	%

Prerequisites

To control your DenyAll, the SNMP must be configured.

Setup

Online License
Offline License

Install the Centreon Plugin on every Poller:

yum install centreon-plugin-Network-Denyall-Snmp

On the Centreon Web interface in Configuration > Monitoring Connector Manager, install the DenyAll SNMP Monitoring Connector

Install the Centreon Plugin on every Poller:

yum install centreon-plugin-Network-Denyall-Snmp

On the Centreon Central server, install the Centreon Monitoring Connector from the RPM:

yum install centreon-pack-network-denyall-snmp

On the Centreon Web interface in Configuration > Monitoring Connector Manager, install the DenyAll SNMP Monitoring Connector

Host configuration

Add a new Host and fill the IP Address/FQDN, SNMP Version and SNMP Community fields according to the device's configuration
Apply the Net-Denyall-SNMP-Custom Host Template

When using SNMP v3, use the SNMPEXTRAOPTIONS Macro to add specific authentication parameters More information in the Troubleshooting SNMP section.

Mandatory	Name	Description
	SNMPEXTRAOPTIONS	Configure your own SNMPv3 credentials combo

FAQ

How to test the Plugin and what are the main options for?

Once the plugin installed, log into your Centreon Poller CLI using the centreon-engine user account and test the Plugin by running the following command:

/usr/lib/centreon/plugins/centreon_denyall_snmp.pl \
    --plugin=network::denyall::snmp::plugin \
    --mode=reverse-proxy \
    --hostname=10.30.2.114 \
    --snmp-version='2c' \
    --snmp-community='denyall_ro' \
    --warning-cpu-utilization='90' \
    --critical-cpu-utilization='95' \
    --verbose

Expected command output is shown below:

OK: All reverse proxies are ok | 'c0e7cb1b2b6f7f20a19fdbaf3296c552#reverse_proxy.cpu.utilization.percentage'=0.00%;0:90;0:95;0;100 'c0e7cb1b2b6f7f20a19fdbaf3296c552#reverse_proxy.memory.usage.bytes'=11534336B;;;0; 'c0e7cb1b2b6f7f20a19fdbaf3296c552#reverse_proxy.requests.persecond'=0.00;;;0; 'c4b59d91060c39140fcafc114e7d96e4#reverse_proxy.cpu.utilization.percentage'=0.00%;0:90;0:95;0;100 'c4b59d91060c39140fcafc114e7d96e4#reverse_proxy.memory.usage.bytes'=25165824B;;;0; 'c4b59d91060c39140fcafc114e7d96e4#reverse_proxy.requests.persecond'=0.00;;;0;
checking reverse proxy 'c0e7cb1b2b6f7f20a19fdbaf3296c552'
    status: ok
    cpu usage: 0.00 %
    memory used: 11.00 MB
    requests: 0.00/s
checking reverse proxy 'c4b59d91060c39140fcafc114e7d96e4'
    status: ok
    cpu usage: 0.00 %
    memory used: 24.00 MB
    requests: 0.00/s

The command above monitors DenyAll (--plugin=network::denyall::snmp::plugin --mode=memory) identified by the IP address 10.30.2.114 (--hostname=10.30.2.114). As the Plugin is using the SNMP protocol to request the device, the related community and version are specified (--snmp-version='2c' --snmp-community='denyall_ro').

This command would trigger a WARNING alarm if cpu utilization over 90% (--warning-cpu-utilization='90') and a CRITICAL alarm over 95% (--critical-cpu-utilization='95').

All the options as well as all the available thresholds can be displayed by adding the --help parameter to the command:

/usr/lib/centreon/plugins/centreon_denyall_snmp.pl \
    --plugin=network::denyall::snmp::plugin \
    --mode=reverse-proxy \
    --help

Troubleshooting

UNKNOWN: SNMP GET Request : Timeout

If you get this message, you're probably facing one of theses issues:

The SNMP agent of the device isn't started or is misconfigured
An external device is blocking the request (firewall, ...)

UNKNOWN: SNMP GET Request : Cant get a single value.

This error message often refers to the following issues:

The agent doesn't support the MIB used by the plugin
The targeted SNMP OID cannot be fetched because of insufficient privileges on the device. SNMP Agent must be capable of accessing to the enterprise branch: .1.3.6.1.4.1.18433.10

Monitoring Connector Assets​

Monitored Objects​

Collected Metrics​

Prerequisites​

Setup​

Host configuration​

FAQ​

How to test the Plugin and what are the main options for?​

Troubleshooting​

UNKNOWN: SNMP GET Request : Timeout​

UNKNOWN: SNMP GET Request : Cant get a single value.​