Debian/Ubuntu Tips and Tricks

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Debian/Ubuntu Tips and Tricks

Archive for the 'Administration' Category

How Tos on administration. How to make your system run smoothly, tips and tricks on getting over common troubles.

How-To: Mounting /dev in a chroot environment

Posted by chantra on 8th May 2010

When working in a chrooted environment, there is a few special file systems that needs to be mounted so all programs behave properly.

For instance, grub will need to access your disk devices....

While most special file systems might be mounted with:

# mount fstype -t fstype /tmp/chroot/mountpoint

Where fstype will be sysfs, proc, /dev is not following this rule.

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How-To: Changing the default text editor

Posted by chantra on 16th September 2009

There is a few software that will use the editor command to find out what text editor to use. Example commands will be dch to add a new .deb changelog entry, revision control softwares when prompting for a commit message ...

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How-To: Virtual emails accounts with Postfix and Dovecot — page 3

Posted by chantra on 18th January 2009

This entry is part 2 of 3 in the series How-To: Virtual emails accounts with Postfix and Dovecot

5. Configuring Dovecot

Dovecot has its SQL configuration gathered in a separated file: /etc/dovecot/dovecot-sql.conf, so let's edit edit with our settings:

# vi /etc/dovecot/dovecot-sql.conf

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Posted in Administration, HowTo, Networking | 1 Comment »

How-To: Virtual emails accounts with Postfix and Dovecot — page 2

Posted by chantra on 18th January 2009

This entry is part 2 of 3 in the series How-To: Virtual emails accounts with Postfix and Dovecot

4. Configuring Postfix

4.1. main.cf and master.cf

Your postfix main.cf file should look like:

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How-To: Virtual emails accounts with Postfix and Dovecot

Posted by chantra on 18th January 2009

This entry is part 1 of 3 in the series How-To: Virtual emails accounts with Postfix and Dovecot

This tutorial will explain how to run a mail server with virtual domains and users using a MySQL backend to store email informations.
Postfix will be our SMTP server, Dovecot will be handling IMAP (optionally one could configure POP3 also) so that users can retrieve their email.

Another tutorial will cover SPAM fighting using DSPAM based on this implementation (yet to be done).

This tutorial was done on Debian Etch using postfix 2.3.8-2etch4 and 1.0.rc15-2etch4.

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Posted in Administration, HowTo, Networking | 2 Comments »

How-To: Apache2 authentication using MySQL backend — page 2

Posted by chantra on 17th December 2008

This entry is part 1 of 2 in the series How-To: Apache2 authentication using MySQL backend

3. Creating users

Here we will be using sha1 password. To create a password, you can use the following command:

# echo -n 'password' | sha1sum
5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8 -

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Posted in Administration, HowTo, HTTP, Networking, System | 5 Comments »

How-To: Apache2 authentication using MySQL backend

Posted by chantra on 17th December 2008

This entry is part 1 of 2 in the series How-To: Apache2 authentication using MySQL backend

this tutorial will explain how to use a MySQL backend in order to authentication users against your Apache website.

To achieve this we will use Apache2 and its auth_mysql module.

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Posted in Administration, HowTo, HTTP, Networking, System | 1 Comment »

How-To: Redirecting network traffic to a new IP using IPtables

Posted by chantra on 6th December 2008

While doing a server migration, it happens that some traffic still go to the old machine because the DNS servers are not yet synced or simply because some people are using the IP address instead of the domain name....

By using iptables and its masquerade feature, it is possible to forward all traffic to the old server to the new IP.

This tutorial will show which command lines are required to make this possible.

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Posted in Administration, HowTo, Networking | 14 Comments »

How-To: Setting up BGP on Vyatta — page 3 — Setting BGP

Posted by chantra on 2nd November 2008

This entry is part 3 of 3 in the series How-To: Setting up BGP on Vyatta

3. Setting BGP

As told earlier on, vyatta-bgp1 will advertise AS 1 with network 1.1.1.0/24 to its neighbor vyatta-bgp2 handling AS 2
and
vyatta-bgp2 will advertise AS 2 with network 2.2.2.0/24 to its neighbor vyatta-bgp1 handling AS 1

They will use a common password for this communication, which is BGPtutorial.

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How-To: Setting up BGP on Vyatta — page 2 — Network interfaces

Posted by chantra on 1st November 2008

This entry is part 2 of 3 in the series How-To: Setting up BGP on Vyatta

2. Setting the network interfaces

During this part, we are going to set up the 2 Border Gateway routers'network interfaces. In vyatta world, you need to enter the interactive configuration shell by typing:

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