Linux LUKS and dm-crypt and cryptsetup for filesystem encryption


A Linux 2.6 kernel with device mapper and dm-crypt support is needed. On Fedora Core 4 systems you really don’t have to do anything as the kernel has device mapper and dm-crypt enabled as modules (dm-mod and dm-crypt respectively). The modules are loaded automatically when the system needs them.

Filesystem Tuning for RRDtool and RRDtool in Zenoss

= Tuning RRDtool for performance =

RRDtool minimizes writing to disk by using circular buffers. If you run a small deployment of RRDtool with a few hundred rrd files, you will find RRDtool to be very fast in updating its rrd files. If your installation runnins into 50k or 100k or even more rrd files, things may be less speedy.

== Background Information ==

To understand RRDtool performance tuning, you must know some basics about the RRDtool file format as well as the way the OS accesses files on disk.

How to Grow a ext2 / ext3 LVM filesystem

lvextend -L +1G /dev/vg0/vol_mysql


resize2fs /dev/vg0/vol_mysql 



Linux Encrypted Filesystem How-To with dm-crypt

An encrypted filesystem will protect against bare-metal attacks against a hard drive. Anyone getting their hands on the drive would have to use brute force to guess the encryption key, a substantial hindrance to getting at your data.

How to use Logical Volume Manager (LVM) to grow etx4 file systems online

One aspect of moving towards a highly available, always up system is being able to add space to a server without having to shutdown the applications and without having to unmount file systems. 

LVM and ext4 combined are a giant leap to being able to run mission critical applications on Linux systems.

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