By: utlemming

April 1, 2009 7:14 am

20,380 views

PXE Booting NFS or iSCSI Roots for a Diskless Environment

Abstract SLES 10 and SLES 11 both support interesting features -- that is the idea of diskless booting. There are a couple of really good guides on how to do it, but very few take you step by step through the process. By following this guide, you should be able to configure a PXE Boot […]

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By: utlemming

November 7, 2008 12:12 pm

7,755 views

Implementing MPIO over iSCSI: Considerations, Common Issues and Clustering Concerns

Scope This paper seeks to demystify multipath over software iSCSI initator and common concerns. Most notably, it addresses some concerns about fail-over, OCFS2, Linux Heartbeat and OCFS2 questions. Why? While it is true that the TCP/IP stack has built in redundancy, the idea of highly available systems is to reduce single points of failure. There […]

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By: utlemming

September 12, 2008 1:40 pm

10,996 views

IPSEC: Implementing Server-to-Server Encryption of TCP/IP Connections

Introduction Under a variety of circumstances, it is desirable to encrypt data between multiple computers. One of the beauties of open source is that there is a multiplicity of answers. Unfortunately, with those answers comes some confusion. Often times, people overlook some solutions, and one of those solutions is the use of IPSEC transport mode […]

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By: utlemming

September 5, 2008 4:32 pm

42,803 views

stunnel: Securing the Insecure with SSL and Creating SSL Tunnels

Introduction to stunnel Just about every system administrator comes across a time when there is a need to encrypt some service. Perhaps your mail program just can't handle it. Or maybe you need to take a non-SSL aware VNC server and make it SSL-aware. Maybe you're just paranoid. For such moments in system administrating there […]

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By: utlemming

June 27, 2008 4:32 pm

3,104 views

SLES 10 SP2 networking under Xen, troubleshooting and recommendations

Introduction This guide seeks to address common networking issues with SLES 10 SP2. Between SLES 10 SP1 and SLES 10 SP2, the networking configuration was redone to enable request enterprise features. Audience This guide is targeted at new and intermediate Xen users. Advanced users may find the information in this guide to be somewhat-lacking or […]

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By: utlemming

June 25, 2008 12:46 pm

4,857 views

Enabling UID 0 logins via LDAP or other external authentication source

Scope This article is targeted at advanced users migrating from other Linux platforms to SUSE Linux who require UID 0 logins. Skill Level The methods described in this article are advanced. If you fail to follow the precautions, you will be booting into the rescue system to recover. Security Note There is a reason why […]

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By: utlemming

March 21, 2008 2:14 pm

15,056 views

Xen Network Bridges Explained with Troubleshooting Notes

The topic of Xen Networking is an area that is somewhat muddled. A simple Google search shows that many people have written on this topic, with very few of them understanding how Xen networking works. This article was written with the goal of defining how the networking works and why certain behavior exists. This document […]

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By: utlemming

January 25, 2008 5:08 pm

4,735 views

Implementing boot.crypter for USB token/password authentication of encrypted hard drives and swap space

Download crypter.tar_0.bz2 the idea For most system administrators, desktop users, auditors and managers, data is extremely import. Data like financial, business secrets, and medical records, among a few, are extremely sensitive. The risk of having that data leaked, is greater than the minimal performance hit than doing disk based encryption. With modern computers, […]

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