Configurare Sistem de operare

How to Modify Your Hosts File MacOS

Your hosting provider may offer you a temporary URL in the http://IP/~username format (where IP represents the server’s IP address and username represents the cPanel account name) to access your website. This is useful, for example, if you migrate your website to a new server and want to test the site before you point the DNS records to it.

However, some sites will not work with a temporary URL. For those sites, you can configure your workstation with the server’s IP address. To do this, modify your workstation’s /etc/hosts file to use the server’s domain name and IP address.

This document explains how to modify your workstation’s /etc/hosts file.

[mai mult...]

How To Clear Your DNS Cache on MAC OS

Overview

Your DNS cache stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you can no longer access the site.

If you encounter a large number of HTML 404 error codes, you may need to clear your DNS cache. After you clear your DNS cache, your computer will query nameservers for the new DNS information.

[mai mult...]

Reset Your Ubuntu Password Easily from the Live CD

Our last article on how to reset your Ubuntu password easily through the grub menu was quite popular, so I’ve decided to make a series on all the different ways to reset your password on either Linux or Windows… today’s lesson is how to use the Live CD to reset the password.

Note that we’ll also cover how to protect yourself against somebody else resetting your password, so stay tuned!

image

Of course, this method will also work if you’ve installed your Ubuntu Live CD to a thumb drive.

Resetting the Password

You’ll want to boot from your Ubuntu Live CD, choosing “Try Ubuntu without any change to your computer” from the boot menu.

image

Once the system boots, open up a new Terminal window from Applications \ Accessories and then type in the following command:

sudo fdisk -l

This command is used to tell what device name the hard drive is using, which in most cases should be /dev/sda1, but could be different on your system.

image

Now you’ll need to create a directory to mount the hard drive on. Since we’re actually booting off the live cd, the directory doesn’t really get created anywhere.

sudo mkdir /media/sda1

The next command will mount the hard drive in the /media/sda1 folder.

sudo mount /dev/sda1 /media/sda1

Now it’s time for the command that actually does the magic: chroot. This command is used to open up a shell with a different root directory than the current shell is using, and we’ll pass in the folder where we mounted the hard drive.

sudo chroot /media/sda1

Now you should be able to use the passwd command to change your user account’s password, and it will be applied to the hard drive since we are using chroot.

passwd geek

Note that you’ll have to type your username after the passwd command in order to change the right password.

image

Now you should be able to reboot your system and log yourself in with your new password.

[mai mult...]

Install the Firestarter Firewall on Ubuntu Linux

Firestarter is an easy to use firewall for Ubuntu that includes a GUI administration tool. Installation of this firewall is as easy as using it. In this HowTo we will cover how to install the firewall.

Open a terminal window, and type in the following command:

sudo apt-get install firestarter

After the installation is finished, you can find the administration GUI at System \ Administration \ Firestarter:

When you launch the GUI for the first time, it will take you through a setup wizard:

Click forward, and you will be able to select the network device. If you are using DHCP for your machine, make sure you select that checkbox here:

Click Forward, and then Forward again. You will see the final screen of the wizard:

Click the save button and you will see the normal GUI screen:

This GUI is accessible from the tray icon, shown here:

The firewall is now installed. The firewall will continue running whether or not you are running the GUI, but the GUI will not be started up automatically unless you add it to the startup list using this path:

sudo /usr/sbin/firestarter

[mai mult...]