bmon - bandwidth monitor and rate estimator
bmon [--show-all] [--use-si]
[--input=MODULE] [--output=MODULE]
[OPTIONS...]
bmon is a monitoring and debugging tool to capture networking
related statistics and prepare them visually in a human friendly way. It
features various output methods including an interactive curses user
interface and a programmable text output for scripting.
-h, --help
Prints a short help text and exits.
-V, --version
Prints the versioning identifier and exits.
-i, --input=MODULE[:OPTIONS][,MODULE...]
Set list of input modules to load and use. Multiple
modules can be used in parallel. bmon automatically loads a useful and working
input module by default. See INPUT MODULES for more details.
-o, --outputMODULE[:OPTIONS][,MODULE...]
Set list of output modules to load and use. Multiple
modules can be used in parallel. By default, bmon will use the curses output
mode, if that is not available due to an incompatible console it will fall
back to a simple text mode. See OUTPUT MODULES for more details.
-U, --use-si
Use SI unit system (1KB = 1'000 bytes) instead of 1KB =
1'024 bytes.
-f, --configfile=FILE
Set alternative path to configuration file.
-p, --policy=POLICY
Set policy defining which network interfaces to display.
See INTERFACE SELECTION for more details.
-a, --show-all=
Display all interfaces, even interface that are
administratively down.
-r, --read-interval=FLOAT
Set interval in seconds in which input modules read
statistics from their source. The default is 1.0 seconds.
-R, --rate-interval=FLOAT
Set interval in seconds in which the rate per counter is
calculated. The default is 1.0 seconds.
-b, --use-bit
Show rates in bits per second instead of bytes per
second.
-L, --lifetime=FLOAT
Set lifetime of an element in seconds before it is no
longer displayed without receiving any statistical updates. The default is 30
seconds.
Input modules provide statistical data about elements. Each
element consists of attributes which represents a counter, a rate, or a
percentage. Elements may carry additional child elements to represent a
hierarchy. Each element is assigned to a group defined by the input module.
Input modules are polled in the frequence of the configured read
interval.
The following input modules are available:
- netlink
- Uses the Netlink protocol to collect interface and traffic control
statistics from the kernel. This is the default input module.
- proc
- Reads interface statistics from the /proc/net/dev file. This is considered
a legacy interface and provided for backwards compatibily reasons. This is
a fallback module if the Netlink interface is not available.
- dummy
- Programmable input module for debugging and testing purposes.
- null
- No data collected.
To receive additional information about a module, run the module
with the "help" option set like this:
bmon -i netlink:help
See MODULE CONFIGURATION for more details.
Output modules display or export the statistical data collected by
input modules. Multiple output modules can be run at the same time. bmon
will not prevent possible conflicts such as multiple output modules writing
to the console.
The following output modules exist:
- curses
- Interactive curses based text user interface providing real time rate
estimations and a graphical representatio nof each attribute. Press '?' to
display the quick reference guide. This is the default output mode.
- ascii
- Simple programmable text output intended for human consumption. Capable of
printing list of interfaces, detailed counters and graphs to the console.
This is the default fallback output mode if curses is not available.
- format
- Fully scriptable output mode inteded for consumption by other programs.
See the module help text for additional information.
- null
- Disable output.
To receive additional information about a module, run the module
with the "help" option set like this:
bmon -o curses:help
See MODULE CONFIGURATION for more details.
The syntax to configure modules is as follows:
ARGUMENT ::= mod1[:OPTS][,mod2[:OPTS]...]
OPTS ::= OPTION[;OPTION...]
OPTION ::= option[=value]
Run the module with option "help" to receive the list of
options for each module:
bmon -i module:help
The following syntax is used to define the interface selection
policy:
SELECTION ::= NAME[,NAME[,...]]
NAME ::= [!]interface
The interface name may contain the character '*' which will act as
a wildcard and represents any number of any character type, e.g. eth*, h*0,
...
Examples:
lo,eth0,eth1
eth*,!eth0
To run bmon in curses mode monitoring the interfaces eth0 and
eth1:
bmon -p eth0,eth1 -o curses
To run bmon in format mode, monitoring any eth* interfaces, with a
specified format string:
bmon -p 'eth*' -o format:fmt='$(element:name)
$(attr:rxrate:packets)\n'
/etc/bmon.conf
$HOME/.bmonrc
Thomas Graf <tgraf@suug.ch> among others