Automating Linux and Unix System Administration Second Edition phần 7 pdf

... has bugs; and all manner of issues crop up that cause hosts and applications to fail. System and service monitoring is automation’s com-panion tool, used to notify us when systems and applications ... chapter, and we believe that our choices will scale with your environment as it grows.฀have chosen Nagios for our system and service monitoring system. Nagios is flex-ible and mature, and help ... schedule plug-ins and handle notifications, plug-ins to perform host and service checks, NRPE to run plug-ins on remote hosts, and the Nagios CGI web interface to display status and to interact...

... tasks that you might never have considered automating. Automating Linux and Unix System Administration Second Edition Nate Campi and Kirk BauerINTRODUCTIONxxivDownloading the CodeThe ... Automating Linux and Unix System Administration, Second Edition Copyright © 2009 by Nate Campi, Kirk BauerAll rights reserved. ... command oq`k)g is executed. xvAbout the AuthorsNATE CAMPI is a UNIX and Linux system administrator by trade, cur-rently working as a UNIX operations manager in San Francisco. His system administration...

... + +7 Naikraha]`ejc]j`pn]ehejcsdepaol]_a heja9zo+ZXo'+ +7  heja9zo+Xo' + +7 Lnk_aoopdaheja$eb]jupdejceohabp% heja]j`Lnk_aooHeja$ heja %7 y_hkoa$?KJB %7 _hkoa$LNEJPO %7 atep ,7 ALWAYS WATCH FOR RACE ... each system by logging in and manually run-ning the _b]cajp command. Cfengine follows a good theory in system- administration automation: the more ways you can initiate changes to a system, ... lnejpo%kn`ea?]j#pklaj lnejpo6 Xj 7 iu$!Lnejpo( heja %7 sdeha$ heja98LNEJPO%w_dkil$ heja %7 iu$ ]__kqjp( lnejp%9olhep++( heja7 Lnejpow lnejpy9 ]__kqjp7y_hkoa$LNEJPO %7 Klajpdahkcbeha]j`lnk_aooa]_dhejaOpknanaoqhpoej]psk)peand]odp]^haklaj$HKC(...

... master, system upgrade, and patching procedures is easy before the systems and procedures are put into use. Once you’ve been deploying and updating systems using automated means, reorganizing and ... odahh_kii]j`o6]hh66+qon+^ej+n`]pa)ojpl-peiakqp9/,na`d]p*Dn,.[M-66+qon+hk_]h+o^ej+hkc[l]_g]cao^]_gcnkqj`9pnqaOn all systems, the n`]pa command is executed to synchronize the system s clock. Cfengine terminates this command in 30 seconds if it has not completed. On systems running Red Hat Linux, a ... INSTALLATION113oq^jap-5.*-24*-*,japi]og.11*.11*.11*,wklpekjnkqpano-5.*-24*-* -7 klpekj`ki]ej)j]ia_]ilej*jap 7 klpekj`ki]ej)j]ia)oanrano-5.*-24*-* -7 klpekjpeia)oanrano-5.*-24*-*.0 57 klpekjjpl)oanrano-5.*-24*-*.0 57 klpekjpbpl)oanran)j]iackh`i]opan*_]ilej*jap 7 oanran)j]iackh`i]opan7jatp)oanran-5.*-24*-*.0 57 behaj]iab]e+ltahejqt*, 7 ydkopap_dh]ilwd]n`s]naapdanjap,,6,_6.56.16a]6_37beta`)]``naooap_dh]il7yOne of...

... safe place!).CHAPTER 7 ฀ AUTOMATING A NEW SYSTEM INFRASTRUCTURE163Internal NTP MastersWe’ll use our cfengine master host (goldmaster.campin.net) and our Red Hat Kickstart system (rhmaster.campin.net) ... +ap_+`d_l`*_kjb฀฀฀฀฀`ajuqjgjksj)_heajpo7klpekj`d_l)i]t)iaoo]ca)oeva.,0 47 qoa)dkop)`a_h)j]iaokj7oq^jap-5.*-24*-*,japi]og.11*.11*.11*,wklpekjnkqpano-5.*-24*-* -7 klpekj`ki]ej)j]ia_]ilej*jap 7 klpekj`ki]ej)j]ia)oanrano-5.*-24*-* -7 y^]oa`kjannkniaoo]casackpsepdkqpep6``jo)ql`]pa)opuha]`)dk _7 CHAPTER ... procedure to use one or more Solaris systems to synchronize off site instead, and have all other systems synchronize to the internal Solaris NTP servers.The Red Hat system already had jpl` installed...

... `ec<ap_dh]ilcs*_]ilej*jap 7 88::@eC5*/*0)L-*-88::<ap_dh]ilcs*_]ilej*jap 7 $-oanranbkqj`% 77 chk^]hklpekjo6lnejp_i` 77 Ckp]josan6 77 )::DA=@AN88)kl_k`a6MQANU(op]pqo6JKANNKN(e`615335 77 bh]co6mn]]n`n ]7 MQANU6-(=JOSAN6-(=QPDKNEPU6-(=@@EPEKJ=H6- 77 MQAOPEKJOA?PEKJ67cs*_]ilej*jap*EJ= 77 =JOSANOA?PEKJ6cs*_]ilej*jap*2,,EJ=-5.*-24*-*- 77 =QPDKNEPUOA?PEKJ6_]ilej*jap*2,,EJJOap_dh]il*_]ilej*jap*CHAPTER ... INFRASTRUCTURE 174 vkja-,*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja-2*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja-3*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja-4*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja-5*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.,*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja *-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja ... *-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja./*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.0*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.1*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.2*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.3*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.4*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja.5*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja/,*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja/-*-3.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7vkja-24*-5.*ej)]``n*]nl]wpulai]opan7beha+ap_+^ej`+`^*ailpu 7 y7It...

... LNK@+ejlqpo+_h]ooao+_b*i]ej[_h]ooao, and all the appropriate tasks will execute on the host and bring it up to date with our Apache configuration and web content.CHAPTER 7 ฀ AUTOMATING A NEW SYSTEM INFRASTRUCTURE211odahh_kii]j`o6na^qeh`[renpq]h[i]l66+qon+o^ej+lkopi]l+ap_+lkopbet+renpq]h 7 +qon+o^ej+lkopbetnahk]`peiakqp92,ejbkni9pnqaNow ... applications and data from mul-tiple systems. You can modify the files on any system, and the changes become instantly available on all other systems.Problems with network filesystems begin ... this book’s second edition, that rsync now uses the SSH protocol by default to communicate with a remote system, allowing it to use all the standard SSH authentication methods and perform encrypted...

... COURSEMost system administrators are familiar with the `ebb and l]p_d commands. The `ebb command is used to compare text files line by line and show the differences. The l]p_d command takes a ... of state on the system, relays the state changes on to other systems via TCP or multicast UDP, listens for and gathers the state of other cikj` daemons in the local cluster, and answers request ... source files.If merging is entirely new to you and you’re still struggling to understand the concepts, you’re not alone. Revision control system tools and concepts are best learned by working with...

... with Perl as standard software. However, most administrators find that adding Perl to all of their UNIX systems is well worth the effort, and it comes preinstalled on all major Linux distributions. ... `en %7 Jatp(`k]`enheopejcqoejcejpanj]hLanh_kii]j`oPda#`ea#bqj_pekjsehh_]qoapdao_nelppk]^knpebpda#klaj`en#bqj_pekj_]hhb]eholnejpXjHeopejc`ena_pknuejpanj]hhu6Xj 7 klaj`en$@EN( `en%kn`ea?kqh`jkpbej``ena_pknu6 `enXj 7 iu ajpnu7Jks(na]`a]_dajpnu(kja]p]peia(ejpkpda ajpnur]ne]^hasdeha$ ajpnu9na]``en$@EN%%wlnejp ajpnuXj 7 y_hkoa`en$@EN %7 APPENDIX ... command that provides information on all of the built-in Bash commands, including control constructs often used in shell scripts, for example: dahlsdehasdeha6sdeha?KII=J@O7`k?KII=J@O7`kjaAtl]j`]j`ata_qpa?KII=J@O]ohkjc]opdabej]h_kii]j`ejpda#sdeha#?KII=J@Od]o]jatepop]pqokbvank*Finally,...

... sectionsclasses, 67 copy, 68–69creating, 66– 67 directories, 69disable, 69 71 editfiles, 71 72 files, 72 73 links, 74 processes, 74 75 shellcommands, 75 cfrun command, 75 76 classescustom, 56– 57 predefined, ... 274 , 312–313immediate errors or failures, 273 Nagios and alerts, 312components of, 275 – 276 configuration files, 276 – 277 features of, 274 – 275 object types, 277 – 278 overview of, 274 remote systems, ... of, 253sectionsclasses, 56, 67 copy, 68–69creating, 66– 67 directories, 69disable, 69 71 editfiles, 71 72 files, 72 73 links, 74 processes, 74 75 shellcommands, 75 cfagent robot, 49–53cf.any...