Debian/Ubuntu Tips and Tricks

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Debian/Ubuntu Tips and Tricks

How-To: Unattended Ubuntu Deployment over Network

Posted by chantra on 23rd June 2007

This entry is part 1 of 5 in the series How-To: Unattended Ubuntu Deployment over Network

there is many ways of installing Linux. Nowadays, the most common one is probably by using a CD. Download the CD, stick it in your CDRom drive and let's roll!!!

If you intent to deploy Ubuntu over several computers, this can easily become cumbersome.

This tutorial will explain how to install Ubuntu/Debian through the network using preseed files so you can turn on your computer, walk away and come back later with your fresh install up and running.

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How-To: Monitor your servers with SNMP and Cacti

Posted by chantra on 11th June 2007

This entry is part 1 of 3 in the series How-To: Monitor your servers with SNMP and Cacti

SNMP (Simple Network Management Protocol) is a protocol for managing networks. Each managed entity in the network will run an snmp server (snmpd) which is going to collect datas from the server such as networking, load, cpu ...

Cacti on the other hand is a frontend to the RRDTool with SNMP support. It collects and keep data in a MySQL database and display them through a PHP web frontend.

This tutorial will show how to configure the network manager to use Cacti and how to set up snmp on the managed host.

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How-To: Monitor your servers with SNMP and Cacti — page 3

Posted by chantra on 10th June 2007

This entry is part 3 of 3 in the series How-To: Monitor your servers with SNMP and Cacti

3. Adding new devices to cacti

A device can be anything which is SNMP enabled. It could be a router, a switch....

In our example, we are going to add the server we configured in the first part of this tutorial. The server is on localhost, but it could be anywhere on a network, as long as our manager host is allowed to connect to its SNMP port.

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How-To: Monitor your servers with SNMP and Cacti — page 2

Posted by chantra on 10th June 2007

This entry is part 2 of 3 in the series How-To: Monitor your servers with SNMP and Cacti

Now that we have our snmp server up and running, we are going to install cacti to manage the snmp server in our network.

2. Installing Cacti

Cacti displays system statistics through a PHP/MySQL web interface.

To gather informations, it runs a script which is going to poll the servers you registered in cacti: /usr/share/cacti/site/poller.php.

So, let's get started an install cacti.

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How-To set up a LDAP server and its clients — page 2

Posted by chantra on 22nd February 2007

This entry is part 2 of 2 in the series How-To set up a LDAP server and its clients

2. Configuring the clients

Each client will need a set of packages. So, now that you are logged on one of your clients, install:

#apt-get install libnss-ldap libpam-ldap nscd
LDAP Account for root: cn=admin,dc=debuntu,dc=local
Password: XXXX
Make local root database admin: yes
Database require logging in: No
Root login account: cn=admin,dc=debuntu,dc=local
Root login password: XXXX

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How-To set up a LDAP server and its clients

Posted by chantra on 22nd February 2007

This entry is part 1 of 2 in the series How-To set up a LDAP server and its clients

LDAP (Lightweight Directory Access Protocol) allows central user, group, domain..... authentication, information storage ...

Using LDAP in a local network, you can allow your users to login and authenticate from anywhere on your network.

This tutorial will be split in 2 parts. In the first part, I will explain how-to install, configure the LDAP server, add a few users and group, in the second part, we will set up Linux client to authenticate through LDAP if the user does not exist on the local filesystem.

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Samba: How to share files for your LAN without user/password

Posted by chantra on 11th February 2007

This tutorial will show how to set samba to allow read-only file sharing for your LAN computers as guest (without be prompted for a password).
Because users won't be prompted for a user/password, this tutorial is meant to be installed in a LAN where all host are to be trusted.

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Secure your SSH server with Public/Private key authentification — page 3

Posted by chantra on 11th January 2007

4. Disabling Authentication by password

In order to disable authentication by password, we need to connect as root on the remote machine. On connected, go and edit /etc/ssh/sshd_config and make sure you have the following setting:

....
ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no
...

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Secure your SSH server with Public/Private key authentification — page 2

Posted by chantra on 11th January 2007

2. Adding the public key to the authorized key

In the first place, we need to upload the key to the remote machine:

user@host:~$ scp ~/.ssh/id_rsa.pub remoteuser@remotehost:~/

Now, the public key is uploaded, let's add it to the authorized keys. To do so, we are going to connect to remotehost as remoteuser and add the key at the end of file ~/.ssh/authorized_keys and delete it once added:

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Secure your SSH server with Public/Private key authentification

Posted by chantra on 11th January 2007

Open SSH is the most widely used SSH server on Linux. Using SSH, one can connect to a remote host and gain a shell access on it in a secure manner as all traffic is encrypted.

A neat feature of open SSH is to authenticate a user using a public/private key pair to log into the remote host. By doing so, you won't be prompted for the remote user's password.

This tutorial will describe how to create a SSH public/private key pair, how to enable key based authentication and finally how to disable password authentication.

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