Linux Tips, Troubleshooting, Package, Installation Tools

profile System wide environment and startup script program. /dev/MAKEDEV The /dev/MAKEDEV file is a script written by the system administrator that creates local only device files or links such as device files for a non-standard device driver. /etc/aliases Where the user's name is matched to a nickname for e-mail. /etc/bootptab The configuration for the BOOTP server daemon. /etc/crontab Lists commands and times to run them for the cron deamon. /etc/dhcpd.conf The configuration file for the DHCP server daemon. /etc/ethers File for RARP mapping from hardware addresses to IP addresses. See the man page ethers(5). /etc/exports The file describing exported filesystems for NFS services. /etc/fdprm The floppy disk parameter table. Describes the formats of different floppy disks. Used by setfdprm. /etc/filesystems Can be used to set the filesystem probe order when filesystems are mounted with the auto option. The nodev parameter is specified for filesystems that are not really ...

This detailed how to guides to achieve high availability and performance on Debian and CentOS for accessing storage space at IBM DS8300 Data Storage Systems. Tested on Debian GNU/Linux 5.x Lenny 64 bits and CentOS 5.3 64 bits running on 8 cores blades, with Host Bus Adapters Qlogic and Emulex Light Pulse Fiber Channel in deployed systems at SERPRO . Observations showed that Debian Lenny has the best performance, for our app load profile and hardware. Also, there are listed a number of previously not clearly documented critical pitfalls to avoid. STUDY whole articles, hints, implications, and cited resources before planning your deployment. Every detail matters . Before start, you must have LUNs at IBM DS8300 storage configured for high availability and performance as explained at the article How to configure maximum performance storage space for Debian GNU/Linux on IBM DS 8300 Data Storage Systems . Multipath and storage basic concepts In order t...

Introduction You can monitor your system's Web performance quite easily with graphical Linux tools. You'll learn how to use several in this chapter, including MRTG, which is based on SNMP and monitors raw network traffic, and Webalizer, which tracks Web site hits. SNMP Most servers, routers and firewalls keep their operational statistics in object identifiers (OIDs) that you can remotely retrieve via the Simple Network Management Protocol (SNMP). For ease of use, equipment vendors provide Management Information Base (MIB) files for their devices that define the functions of the OIDs they contain. That's a lot of new terms to digest in two sentences, so take a moment to look more closely. OIDs And MIBs OIDs are arranged in a structure of management information (SMI) tree defined by the SNMP standard. The tree starts from a root node, which then descends through branches and leaves that each add their own reference value to the path separated by a period.. Figure 22-1 sh...