How to install and use vnstat in Centos

1. Install vnstat

The epel package comes with vnstat. You can install epel and run the following command:

Yum install vnstat-y
II. Configuration

Modify the/etc/sysconfig/vnstat file and you can see the following configuration (if the default network port is eth0, you can not modify it ):

VNSTAT_OPTIONS = "-u-I eth0"
Modify/etc/vnstat. conf and focus on "Interface" to confirm the default network port.

Interface "eth0"
For ease of viewing, I modified the following parameters
RateUnit 0
3. Create a database

Before creating a database file, run the chsh command to modify the vnstat execution script.

# Chsh-s/bin/bash vnstat
Run the following command to create a database:

# Runuser-l vnstat-g vnstat-c '/usr/bin/vnstat-u-I eth0'
When you create a database for the first time, the following content appears:

Error: Unable to read database "/var/lib/vnstat/eth0 ".
Info:-> A new database has been created.
If you directly execute runuser to create a database without modifying the shell environment of vnstat, the following error is reported:

This account is currently not available.
After the database is successfully created, the shell environment of vnstat is restored to nologin.

# Chsh-s/sbin/nologin vnstat
Run vnstat after creation. An error is returned due to insufficient data volume:

Eth0: Not enough data available yet.
After waiting for a while, you can output the result:

[Root @ li815-118 ~] # Vnstat
Database updated: Wed Jan 21 22:45:02 2015

Eth0 since 01/21/15

Rx: 521.74 MB tx: 581.62 MB total: 1.08 GB

Monthly
Rx | tx | total | avg. rate
------------------------ + ------------- + ---------------
Jan '15 521.74 MB | 581.62 MB | 1.08 GB | 0.62 KB/s
------------------------ + ------------- + ---------------
Estimated 771 MB | 859 MB | 1.59 GB |

Daily
Rx | tx | total | avg. rate
------------------------ + ------------- + ---------------
Today 521.74 MB | 581.62 MB | 1.08 GB | 13.80 KB/s
------------------------ + ------------- + ---------------
Estimated 549 MB | 612 MB | 1.13 GB |
4. Boot Service

The vnstat service is automatically started when centos6 is started:

Chkconfig vnstat on
Some service control commands of vnstat:

Service vnstat start
Service vnstat stop
Service vnstat restart
Service vnstat status
V. Example

Output xml format data

Vnstat-I eth0-xml
View eth0 status

Vnstat-I eth0
View daily status

Vnstat-I eth0-d
View the status of each hour

Vnstat-I eth0-h
View Weekly Status

Vnstat-I eth0-w
View Top 10 networks

Vnstat-I eth0-t
View information in simple mode

Vnstat-I eth0-s
Computing transmission

Vnstat-I eth0-tr
View real-time rate

Vnstat-I eth0-l