PRTG Manual: SNMP Linux Meminfo Sensor
The SNMP Linux Meminfo sensor monitors the memory usage of a Linux/Unix system via the Simple Network Management Protocol (SNMP).
SNMP Linux Meminfo Sensor
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
▪Dutch: SNMP Linux meminfo
▪French: Linux information mémoire (SNMP)
▪German: SNMP Linux Speicherinfo
▪Japanese: SNMP Linux メモリ情報
▪Portuguese: Meminfo Linux (SNMP)
▪Russian: Linux Meminfo по SNMP
▪Simplified Chinese: SNMP Linux 内存信息
▪Spanish: Meminfo Linux (SNMP)
▪This sensor supports the IPv6 protocol.
▪This sensor has a very low performance impact.
▪See the Knowledge Base: Monitoring Linux problem - SNMP port not reachable
The Add Sensor dialog appears when you manually add a new sensor to a device. It only shows the settings that are required to create the sensor. You can change nearly all settings on the sensor's Settings tab after creation.
Click the Settings tab of a sensor to change its settings.
Basic Sensor Settings
Setting |
Description |
|---|---|
Sensor Name |
Enter a name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets.
|
Parent Tags |
Shows tags that the sensor inherits from its parent device, parent group, and parent probe.
|
Tags |
Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited.
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor: ▪snmpmeminfosensor ▪memorysensor |
Priority |
Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority ( |
Usually, a sensor connects to the IP Address/DNS Name of the parent device. See the device settings for details. For some sensors, you can explicitly define the monitoring target in the sensor settings.
Sensor Display
Setting |
Description |
|---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.
|
Graph Type |
Define how different channels are shown for this sensor: ▪Show channels independently (default): Show a graph for each channel. ▪Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic. |
Stack Unit |
This setting is only visible if you enable Stack channels on top of each other as Graph Type. Select a unit from the list. All channels with this unit are stacked on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so. |
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click 
under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Scanning Interval
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
Schedules, Dependencies, and Maintenance Window
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window.
Access Rights
For more information, see section Root Group Settings, section Access Rights.
Which channel units are available depends on the sensor type and the available parameters. If no configurable channels are available, this field shows No configurable channels.
Channel Unit Configuration
For more information, see section Root Group Settings, section Channel Unit Configuration.
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel |
Description |
|---|---|
Available Memory |
The available memory |
Available Memory % |
The available memory (%) |
Downtime |
In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status |
Free Physical Memory |
The free physical memory in bytes |
Free Physical Memory % |
The free physical memory in percent
|
Free Swap Space |
The free swap memory in bytes |
Free Swap Space % |
The free swap memory in percent |
Total Free Memory |
The total free memory (physical memory plus swap) in bytes |
Total Free Memory % |
The total free memory (physical memory plus swap) in percent |
KNOWLEDGE BASE
Monitoring Linux problem - SNMP port not reachable
▪https://kb.paessler.com/en/topic/5353
What security features does PRTG include?
▪https://kb.paessler.com/en/topic/61108
My SNMP sensors don’t work. What can I do?
