When you are running bonding in active-backup mode, you can detect which slave is active by listing /proc/net/bonding/bond0. How to change active slave?
Read More »How to change Currently Active Slave when runnning bonding in active-backup mode
Enable stateless offloads to improve system performance.
Stateless offloads, such as checksum offload, segmentation offload, and large receive offload, can improve system performance by moving some of the processor-intensive tasks that do not require a connection to the network adapter.
Read More »ethtool: offloading
LVM is a logical volume manager for the Linux kernel; it manages disk drives and similar mass-storage devices, in particular large ones. The term “volume” refers to a disk drive or partition thereof.
Every LVM operation makes backup of lvm metadata. Metadata archive stored in directory /etc/lvm/archive/ in easily readable text files. Each operation creates own metadata backup file, with information when it was created. For example:
When you need install some package to old discontinued debian, you will get Error 404 Not Found Solution is change /etc/apt/sources.list deb http://archive.debian.org/debian/ etch main… Read More »Still using debian etch?
Very often problems like ‘my website is not working’ or ‘I did not get any emails’ are caused by improperly set up dns records or expired domain. At my work, I’m permanently dealing with incorrectly set up dns records. There are available services like intodns.com which you can use to check dns records for domain. But what to do, if you have problem with reverse dns? Or you want to check, if your reverse delegation is set up correctly?
To manage and monitor hardware raid, you need proper utility. Most of vendors provides raid utilities only for Redhat based linuxes. For Debian based distribution… Read More »Hardware raid in debian
I have found nice howto about apache and Active directory authentication http://www.netexpertise.eu/en/apache/authentication-against-active-directory.html
With shrinking IT budgets you will at some point be tempted fill your RAID controllers with cheap desktop hard drives. You may also be tempted to replace your servers system drives with them as well. I’m going to give you some reasons why you should consider buying those pricey enterprise class drives instead.
Common setup used at many mailservers is postfix with amavis. It is possible to be less restrictive to emails sent by our clients using our server without turning off antispam itself for sent emails.Read More »Whitelist SMTP Authorized users
If your dealing with big RAID arrays with a linux 2.6 kernel you will need to tweak your block device readahead settings. This can double or triple your read speeds. The tweak is very easy. Read More »Tweak the readahead of a raid in linux