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A deeper look into the /sys/devices directory reveals this listing:
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[root@serverA ~]# ls /sys/devices/ isa LNXSYSTM:00 pci0000:00 platform pnp0 pnp1 system virtual
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If we look at a sample representation of a device connected to the PCI bus on our system, we ll see these elements:
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[root@serverA ~]# ls -1 /sys/devices/pci0000:00/0000:00:000/ class config device driver enable irq local_cpus <OUTPUT TRUNCATED> resource resource0 vendor
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The topmost element under the devices directory in the preceding output describes the PCI domain and bus number The particular system bus here is the pci0000:00 PCI bus, where 0000 is the domain number and the bus number is 00 The functions of some of the other files are listed here: File class config detach_state device irq local_cpus resource resource0 (resource0 n) vendor Function PCI class PCI config space Connection status PCI device IRQ number Nearby CPU mask PCI resource host address PCI resource zero PCI vendor ID (a list of vendor IDs can be found in the /usr/share/hwdata/pciids file)
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Linux Administration: A Beginner s Guide
SUMMARY
In this chapter, you learned about the proc file system and how you can use it to get a peek inside the Linux kernel, as well as to influence the kernel s operation The tools used to accomplish these tasks are relatively trivial (echo and cat), but the concept of a pseudo-file system that doesn t exist on disk can be a little difficult to grasp Looking at proc from a system administrator s point of view, you learned to find your way around the proc file system and how to get reports from various subsystems (especially the networking subsystem) You learned how to set kernel parameters to accommodate possible future enhancements Finally, brief mention was made of the allnew (and very important) SysFS virtual file system
Security and Networking
Copyright 2009 by The McGraw-Hill Companies Click here for terms of use
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TCP/IP for System Administrators
Copyright 2009 by The McGraw-Hill Companies Click here for terms of use
Linux Administration: A Beginner s Guide
ight from its inception, a key feature of UNIX has been network awareness To imagine a UNIX system that is not connected to a network is to imagine a sports car without a race track Linux inherits that legacy and keeps it going in full strength To be a system administrator today is to also have a reasonably strong understanding of the network and the protocols used to communicate over it After all, if your server is receiving or sending any information, you are responsible for your server s actions This chapter is an introduction to the guts of the Transmission Control Protocol/ Internet Protocol, better known as TCP/IP We ll tackle the contents in two parts: First, we will walk through the details of packets, Ethernet, TCP/IP, and some related protocol details This part may seem a little tedious at first, but perseverance will pay off in the second part The second part will walk through several examples of common problems and how you can quickly identify them with your newfound knowledge of TCP/IP Along the way we will use a wonderful tool called tcpdump, a tool that you ll find indispensable by the end of the chapter Please note that the intent of this chapter is not to be a complete replacement for the many books on TCP/IP, but rather an introduction from the standpoint of someone who needs to worry about system administration If you want a more complete discussion on TCP/IP, we highly recommend TCP/IP Illustrated, Vol 1, by Richard Stevens (AddisonWesley, 1994)
THE LAYERS
TCP/IP is built in layers, thus the references to TCP/IP stacks In this section, we take a look at what the TCP/IP layers are, their relationship to one another, and finally, why they really don t match the International Organization for Standardization (ISO) sevenlayer Open Systems Interconnection (OSI) model We ll also translate the OSI layers into meanings that are relevant to your network
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