SUSE Linux Enterprise Server Administration (Course 3112):

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NFS also has quirks that pose potential security risks. For example, the following command generates the default iostat report: $ iostat Linux 2.4.7-10 (marta.kurtwerks.com) avg-cpu: %user 2.02 %nice 52.99 %sys 1.01 %idle 43.97 Blk_wrtn/s 11.37 1.68 Blk_read 482868 49298 Blk_wrtn 1371784 203210 10/25/2001 Device: dev8-0 dev22-0 tps 0.84 0.48 Blk_read/s 4.00 0.41 The device listed under the Device column shows the physical device partitions in the format devm-n, where m is the major number and n is the minor number.

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Frequently, the term TCP/IP is used to refer to a group of protocols related to the TCP and IP protocols such as the User Datagram Protocol (UDP), File Transfer Protocol (FTP), Terminal Emulation Protocol (TELNET), and so on. In the late 1960s, DARPA (the Defense Advanced Research Project Agency), in the United States, noticed that there was a rapid proliferation of computers in military communications ref.: Linux Kernel Networking( Implementation and Theory)[LINUX KERNEL NETWORKING][Paperback] chiaradalmaviva.com. The simplest invocation is: sar secs count This command instructs sar to take count samples that are secs seconds apart. For example, the following sar invocation shows CPU usage sampled five times in five seconds: $ sar -u 5 5 Linux 2.4.7-10 (marta.kurtwerks.com) 03:09:56 PM 03:10:01 PM 03:10:06 PM 03:10:11 PM 03:10:16 PM 03:10:21 PM Average: CPU all all all all all all %user 9.20 10.00 0.00 0.00 0.00 3.84 10/25/2001 %system 1.60 1.00 0.40 1.00 0.20 0.84 %idle 0.00 0.00 0.00 0.00 0.00 0.00 %nice 89.20 89.00 99.60 99.00 99.80 95.32 The -u option tells sar to report on CPU utilization. %user indicates the percentage of time that the CPU spends executing user mode code (typically, application programs), %nice is the percentage of time the CPU spends executing user mode code with a nonzero nice priority, %system indicates the time spent executing kernel code (system calls), and %idle shows how much time the CPU is not doing anything Mandatory Rule Set Based read pdf read pdf. Here is an example: You can also just use the plain old more command to see one screen at a time of the entire log file without filtering with grep. Here is an example: Logging your system messages to a remote server is a good security practice. With all servers logging to a central syslog server, it becomes easier to correlate events across your company. It also makes covering up mistakes or malicious activities harder because the purposeful deletion of log files on a server cannot simultaneously occur on your logging server, especially if you restrict the user access to the logging server , source: Instructor's CD Linux read online Instructor's CD Linux Networking: Design.

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