in this small blog post I wanted to show you a nice script to see which drivers are used by the Network Interfaces of a Linux machine.
for f in /sys/class/net/*; do
if [ $driver ]; then
printf "%10s [%s]: %10s (%s)\n" "$dev" "$addr" "$driver" "$operstate"
I find this very useful when you need to find out if your interface is running at 10gb or only 1gb. The output looks like this:
eno1 [2c:60:0c:da:7b:fc]: igb (up)
eno1.361 [2c:60:0c:da:7b:fc]: (up)
eno1.362 [2c:60:0c:da:7b:fc]: (up)
ens255f0 [2c:60:0c:f1:e6:5b]: ixgbe (up)
So you can see that ens255f0 is a 10gb interface and en1 is only 1 gb.
This script has not been written by me but by an Stackexchange user, all credits goes to him. For reference here’s the link to the Stackexchange question.
in this small post we are going to see how systemd works and what are the difference from the old init.d system.
A problem I recently had to solve was a mongodb instance which was starting with the wrong arguments. To debug it I used the following commands:
vdo@ubuntu:/lib/systemd/system$ systemctl status mongod.service
- mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2016-11-04 14:24:21 CET; 3 days ago
Main PID: 2870 (code=exited, status=100)
vdo@ubuntu:/lib/systemd/system$ systemctl status mongodb
- mongodb.service - LSB: An object/document-oriented database
Loaded: loaded (/etc/init.d/mongodb; bad; vendor preset: enabled)
Active: active (running) since Mon 2016-11-07 15:14:44 CET; 1min 23s ago
Process: 16456 ExecStop=/etc/init.d/mongodb stop (code=exited, status=0/SUCCESS)
Process: 16474 ExecStart=/etc/init.d/mongodb start (code=exited, status=0/SUCCESS)
+-16486 /usr/bin/mongod --config /etc/mongodb.conf
So basically I had mongod and mongodb. But which was I suppesed to use and how should I start it?
By googling around I found that mongodb was renamed to mongod after version 2.4. Now that I was sure of the version I was supposed to use I could then enable the correct start script. If you have no startup script you can create one follwing this template:
Description=High-performance, schema-free document-oriented database
ExecStart=/usr/bin/mongod --replSet singleNodeRepl --quiet --config /etc/mongodb.conf
To enable the script:
sudo systemctl enable mongod.service
this command creates a symlink to your service file:
mongod.service -> /lib/systemd/system/mongod.service