Ubuntu 14.04 General config

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Not use ubuntu for long time… some useful commands had forgot, summary again:

1. Permit root login
gedit /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf –> “greeter-show-manual-login=true”
sudo passwd root
reboot

2. Change language
gedit /etc/default/locale –> change what do you want
reboot

3. Script couldn’t run on linux “bad interpreter: No such file or directory”
that should dos format, need change to unix format
vi xxx
check format by “:set ff” or “:set fileformat”
change format by “:set ff=unix” or “:set fileformat=unix”
:wq

4. Enable ssh service
sudo apt-get install openssh-server
gedit /etc/ssh/sshd_config –> “PermitRootLogin yes”
restart by “/etc/init.d/ssh restart”
check by “ps -ef|grep ssh”
reboot

5. Disable firewall
check whether enable by “ufw status”
disable by “ufw disable”

6. Change update source
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vim /etc/apt/sources.list
sudo apt-get update

Refer to default source, can reference this article.

7. Change ip address, add/del GW route, add text to file
sudo ifconfig eth1 up
sudo ifconfig eth0 down
sudo ifconfig eth1 up 10.0.0.30 netmask 255.255.255.128
sudo route add -net 0.0.0.0/0 gw 10.0.0.126 dev eth1
sudo echo ‘nameserver x.x.x.x’ >> /etc/resolv.conf

8. Install DHCP Server

sudo apt-get install isc-dhcp-server
vim /etc/default/isc-dhcp-server

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