Automating Linux and Unix System Administration Second Edition phần 3 ppsx

... 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 ... 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 ... run Linux, and the NFS server hosts run Solaris.One of the major goals of this project is to rapidly deploy and configure the systems hosting the site, as well as to deploy application and...

... ฀฀฀฀฀฀฀฀฀฀฀฀฀CONTENTSxiiiPerl 37 9Basic Usage 38 0Other Scripting Languages 38 2Perl Resources 38 3Basic Regular Expressions 38 3Characters 38 3Matching Repeating Characters 38 4Other Special Characters 38 5Marking and ... Referencing 38 5grep 38 6The sed Stream Editor 38 9Modifying a File 38 9Modifying stdin 39 0Isolating Data 39 1Other Tools 39 1sed Resources 39 2AWK 39 2Very Basic Usage 39 2Not-Quite-As-Basic Usage 39 3AWK ... tasks that you might never have considered automating. Automating Linux and Unix System Administration Second Edition Nate Campi and Kirk BauerINTRODUCTIONxxivDownloading the CodeThe...

... 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, ... $skng`en%+^ej+_boanr`-1ik`a 931 1-2pula9_da_goqi -3 CHAPTER 3 ฀ USING SSH TO AUTOMATE SYSTEM ADMINISTRATION SECURELY 38 jk)lknp)bkns]n`ejc: SSH allows ... 20.55,0/2/,,)+'^qbbano+_]_da612 .32  3, /24Os]l61-0 ,3. -,1121,/1-2Finally, the o_l command allows you to copy files between hosts using the SSH proto-col. The syntax resembles the standard _l command,...

... AUTOMATING A NEW SYSTEM INFRASTRUCTURE1 63 Internal NTP MastersWe’ll use our cfengine master host (goldmaster.campin.net) and our Red Hat Kickstart system (rhmaster.campin.net) as the two systems ... to choose Linux over Solaris systems to handle this role. You should find it quite easy to modify this procedure to use one or more Solaris systems to synchronize off site instead, and have ... exam-ple systems):@D?LI=?=@@N6,,,0 31 30 =.0/@D?L***+?HEAJPEL6-5.*-24*-* I=OG6.11*.11*.11*,@D?LEL6-5.*-24*-*.1,C=PAS=UEL6-5.*-24*-*.10LTAHEJQT/*/-$@a^e]j(., ,3) ,/),5%?klunecdp$?%-550).,,1D*Lapan=jrejQJ@E`]p]oaciajp]p6,,,5 @30 ,QJ@E`]p]oaciajpoeva6/.40QJ@E_k`aoaciajp]p6,,,5,,,,QJ@E_k`aoaciajpoeva6.0?,LTAajpnulkejpbkqj`$sadkla%]p5 @30 6,,B2IuEl]``naoooaaiopk^a?,=4,-?,-5.*-24*-*...

... identical, and contain only a single line:&)jkhk_g(noeva9/ .32 3(soeva9/ .32 3(lnkpk9p_l(d]n`(ejpn(peiak94(jkoqe`(napn]jo91]qnkn]6+atlknp+dkia+"Note The single line in the ]qpk[dkia and ... 5.฀฀฀฀฀฀฀฀฀+ap_+]qpk*i]opan and +ap_+]qpk*dkia. On Solaris, the files are +ap_+]qpk[i]opan and +ap_+]qpk[dkia. The ]qpk*i]opan and ]qpk[i]opan files map filesystem paths to files that contain the commands to ... router at -5.*-24*-*- that handles routing, Network Address Translation (NAT), and DNS- caching services. After we get DNS up and running on one or more of our UNIX systems, we’ll have cfen-gine...

... 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 ... client systems inoperable.With NFS, a user should have the same user ID on all systems. All file ownership on an NFS filesystem—well, any filesystem, really—is assigned by user IDs (UIDs) and ... 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...

... 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...

... 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 ... revision and repository path of the 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 ... line:chk^]hhuecjkna_anp]ejbehao]j``ena_pkneaoecjkna+_b*ecjknaCHAPTER 11 ฀ INFRASTRUCTURE ENHANCEMENT 33 0We issued the orj_kiiep command again, and now, our Subversion repository should have all the changes required to...

... -,40=??ALPq`l))apd,&,*,*,*,+,,*,*,*,+,q`l`lp61-01/,,=??ALPp_l))apd,&,*,*,*,+,,*,*,*,+,p_l`lp61-0,,bh]co6,t -3+ ,t,.,,=??ALPp_l))apd,&,*,*,*,+,,*,*,*,+,p_l`lp61222bh]co6,t -3+ ,t,.,,=??ALPp_l))apd,&,*,*,*,+,,*,*,*,+,p_l`lp61/,4bh]co6,t -3+ ,t,./-4,=??ALPp_l))apd,&,*,*,*,+,,*,*,*,+,p_l`lp6 bh]co6,t -3+ ,t,./.4 233 .,=??ALP,))hk&,*,*,*,+,,*,*,*,+, 32  435 /@NKL,))&&,*,*,*,+,,*,*,*,+,op]paEJR=HE@(JAS-,//-13G=??ALP,))&&,*,*,*,+,,*,*,*,+,op]paNAH=PA@(AOP=>HEODA@?d]ejBKNS=N@$lkhe_u@NKL,l]_gapo(,^upao%lgpo^upaop]ncaplnkpklpejkqpokqn_a`aopej]pekj?d]ejKQPLQP$lkhe_u=??ALP -3 ... 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. ... contents:behpano6wnkkpksja`behaoKsjan6nkkpNaoqhp6KsjanyCHAPTER 12 ฀ IMPROVING SYSTEM SECURITY 36 3Oal./,-61.6,0]qnkn]_bajceja6]qnkn]W-, 13/ Y6WE@ 3, .5 `]aikj*jkpe_aY@eo]^hejc+naj]iejcbeha+ap_+dkopo*amqerpk+ap_+dkopo*amqer*_b`eo]^ha`$laj`ejcnalkoepknuikra%Oal./,-61.6,0]qnkn]_bajceja6]qnkn]W-, 13/ Y6WE@ 3, .5...

... languageadvanced usage, 39 3 39 4basic usage, 39 2 39 3description of, 38 2, 39 2resources, 39 4Bback referencing, 38 5 38 6backupsFAI and, 34 2 34 6Jumpstart and, 33 8 34 0Kickstart and, 34 0 34 2of Subversion ... 35 4 35 5protecting system accounts, 35 9 36 0removing SUID bit, 35 5 35 8removing unsafe files, 36 2 36 3shutting down daemons, 36 1 36 2firewalls and overview of, 36 5 36 6TCP Wrappers, 36 6 36 7Kerberos and, 36 5LDAP ... machines, 39 –40ssh-agent program, 36 37 GGangliabuilding and distributing programs, 31 3 31 8configuring web interface, 31 8 32 1daemons, 31 3overview of, 274, 31 2 31 3Garfinkel, Simson, 35 4GID...