Breathing Linux

Sometimes we have to configure IP fixed in server and even on workstations.
In this article I will show to configure the IP on Debian and Ubuntu distributions.
Is good idea make backup this configuration before modify.
Use this command

#cp /etc/network/interface /etc/network/interface.bkp

If you want to restore settings

#cp /etc/network/interface.bkp /etc/network/interface

Now you have interface backup.

First check which interface is connected to your network

#ifconfig

eth0      Link encap:Ethernet HWaddr 94:de:80:f3:ca:94
          inet addr:192.168.200.2 Bcast:192.168.200.255 Mask:255.255.255.0
          inet6 addr: fe80::96de:80ff:fef3:ca94/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:71628 errors:0 dropped:0 overruns:0 frame:0
          TX packets:55307 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:47699321 (47.6 MB) TX bytes:7476368 (7.4 MB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:65536 Metric:1
          RX packets:10114 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10114 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:826870 (826.8 KB) TX bytes:826870 (826.8 KB)

As in the example eth0 interface is connected with the IP 192.168.200.2

We most configure this archive /etc/network/interface
Use your favorite text editor, i like to use vi.

#vi /etc/network/interface

now let's edit the last line

auto eth0
iface eth0 inet static
address 192.168.200.100
netmask 255.255.255.0
gateway 192.168.200.1

Save configuration and after run the command
#/etc/init.d/networking restart

Another way to configure the IP is used ifconfig command , but every time the system is booted, IP configuration will not be saved.

#ifconfig eth0 192.168.200.100 netmask 255.255.255.0

After configure your gateway which command:

#route add default gw 192.168.200.1 eth0

This article will show you how to start at system startup scripts in Ubuntu and Debian.
First we must create the script in /etc/init.d.

#vi /etc/init.d/myscript.sh

#!/bin/bash
sleep 10 &&
conky &
exit

After creating the script in the /etc/init.d we should give execute permission with the chmod command.

#chmod +x myscript.sh

Now we go using command:
update-rc.d /etc/init.d/myscritp.sh defaults

This exemple will go initialize the conky a software the hardware monitoring. When the system up, the script will initialize with the operational system.

If you want to remove the script from system startup:

You can delete the script

Remove permission with the command

#chmod -x /etc/init.d/myscript.sh

Or remove the boot witch own update-rc.d

#update -rc.d -n -f myscritp.sh remove

Breathing Linux

sábado, 16 de abril de 2016

Setting fixed IP on Linux Ubuntu and Debian

Initialize script on startup the system