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I am using vnstat for first time and I am getting this error while using vnstat -d

Error: Unable to read database "/var/lib/vnstat/eth0": No such file or directory

The file in /var/lib/vnstat are

 enp1s0  wlp2s0

These are my network interfaces.

I can understand it using eth0 file but how can I changed default file to enp1s0 from eth0.

When I use sudo vnstat -u -i eth0, I get error

Error: Unable to read database "/var/lib/vnstat/eth0": No such file or directory Error: Unable to get interface "eth0" statistics. Only available interfaces can be added for monitoring.

Prvt_Yadav
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4 Answers4

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The default interface is defined in the /etc/vnstat.conf file:

$ head /etc/vnstat.conf 
# vnStat 1.13 config file
##

# default interface
Interface "eth0"

# location of the database directory
DatabaseDir "/var/lib/vnstat"

# locale (LC_ALL) ("-" = use system locale)

Although you could change it there, a possibly better way is to create your own ~/.vnstatrc file and modify that:

cp /etc/vnstat.conf ~/.vnstatrc

then use an editor of your choice to change Interface "eth0" to Interface "enp1s0" in the local copy.

See man vnstat.conf for full details.

steeldriver
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  • What about wireless interface – Prvt_Yadav May 02 '18 at 12:46
  • @Debian_yadav what about it, exactly? AFAIK `vnstat` can only have a single default interface, it doesn't differentiate by type. You will need to choose whether you want that to be the wired or wireless one. – steeldriver May 02 '18 at 12:52
  • @steeldriver vnStat has no built-in limit for the number of interfaces it supports. The `Interface` configuration option only defines the interface that gets shown if no other interface is specified with the `-i` parameter. If no parameters are given for the `vnstat` command then a summary of all tracked interfaces will be shown by default. – Teemu Toivola May 05 '18 at 22:53
1

I solved the issue by changing interface in the file /etc/vnstat.conf from eth0 to wlp3s0. If you don't know your network interfaces, you could get by the command ip addr.

mrghofrani
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Many parson answers correctly but missing one more thing

Needs to change configuration in two places /etc/vnstat.conf and HOME Directory/.vnstatrc (Ex. /home/sagar/.vnstatrc)

Change default interface from eth0 to whatever in your machine like enp1s0 or wlp2s0 or wlp3s0

In both files statment will be likeInterface "wlp3s0"

Save file and check again useing coommend vnstat -d

Sagar Pise
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  • Welcome to AskUbuntu! It's best if you post a complete answer, since we aren't sure which other answer(s) you are referencing. For more info about our Q&A format, check out our [tour](https://askubuntu.com/tour) – Nmath Jan 04 '21 at 23:29
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Please start first vnstat service. No matter if configuration (/etc/vnstat.conf or ~/.vnstatrc) is edited or NOT.

systemctl start vnstat
/etc/rc.d/init.d/vnstat start
Paul Bichis
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