... 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-
ibl...
... + +7
Naikraha]`ejc]j`pn]ehejcsdepaol]_a
heja9zo+ZXo'+ +7
heja9zo+Xo' + +7
Lnk_aoopdaheja$eb]jupdejceohabp%
heja]j`Lnk_aooHeja$ 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...
... 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)ojpl-peiakqp9/,
na`d]p*Dn,.[M-66
+qon+hk_]h+o^ej+hkc[l]_g]cao^]_gcnkqj`9pnqa
On all systems, the n`]pa command is execut...
... safe place!).
CHAPTER 7 AUTOMATING A NEW SYSTEM INFRASTRUCTURE
163
Internal NTP Masters
We’ll use our cfengine master host (goldmaster.campin.net) and our Red Hat Kickstart
system (rhmaster.campin.net) ...
+ap_+`d_l`*_kjb
`ajuqjgjksj)_heajpo7
klpekj`d_l)i]t)iaoo]ca)oeva.,0 47
qoa)dkop)`a_h)j]iaokj7
oq^jap-5.*-24*-*,japi]og.11*.11*.11*,...
... 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 INFRASTRUCTURE
211
odahh_kii]j`o6
na^qeh`[renpq]h[i]l66
+qon+o^ej+lkopi]l+ap_+lkopbet+renpq]h 7 +qon+o^ej+lkopbetnahk]`
peiakqp9...
... COURSE
Most 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 answe...
... 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]`enheopejcqoejcejpanj]hLanh_kii]j`o
Pda#`ea#bqj_pekjsehh_]qoapdao_nelppk]^knpebpda
#klaj`en#bqj_pekj_]hhb]eho
lnejpXjHeopejc`ena_pknuejpa...