Linux System Administration Recipes A Problem-Solution Approach

More documents

Recommendations

Info

CHAPTER 3 ■ MONITORING AND UPDATING■ Note Be very, very careful with this! If you type something wrong, you could hose not just one system but allthe systems you’re connected to. However, used carefully, it can be incredibly useful. Just check twice (maybeeven three times in some cases...) before you hit Enter.It’s available as a package for Debian/Ubuntu:sudo apt-get install clustersshor can be installed from source (http://sourceforge.net/projects/clusterssh/).Generate a default global config file with this:cssh -u > /etc/csshrcThen, to set up a system-wide cluster definition, edit the /etc/clusters file to look somethinglike this:servers server1 server2 server3This creates a group called servers, with members server1, server2, and server3. If you nowtype this:cssh serversyou’ll see three SSH windows opening, one to each of the servers.■ Note You can also generate a personal config file with this:cssh -u > /$HOME/.csshrcand can add cluster definitions to this with the same syntax as with the /etc/clusters file. Any cluster definitionsin here will of course exist only for you, rather than being system-wide.92Download at WoweBook.Com
CHAPTER 3 ■ MONITORING AND UPDATINGWith this setup, though, you’ll be logging on as whatever user you’re currently logged in as. To set itup so that you log in as a specific user (say, as root), you can use this syntax in the cluster tag:servers root@server1 root@server2 root@server3It becomes even more useful if you have login via SSH key set up; see recipe 6-1 for more on this.■ Note You can also stick clusters together. If you set up these cluster definitions (tags):servers server1 server2 server3desktops desktop1 desktop2 desktop3all servers desktopsthen cssh all will connect to all six machines at once.93Download at WoweBook.Com
Page 2:
Download at WoweBook.Com
Page 5 and 6:
Download at WoweBook.Comiii
Page 7 and 8:
Contents■About the Author .......
Page 9 and 10:
■ CONTENTS3-7. Writing a Nagios P
Page 11 and 12:
■ CONTENTS■Chapter 8: Using the
Page 13 and 14:
■ CONTENTSAbout the Author■Juli
Page 15 and 16:
■ CONTENTSAcknowledgmentsMany tha
Page 17 and 18:
■ CONTENTSIntroductionThis book i
Page 19 and 20:
■ INTRODUCTIONDownloading the Cod
Page 21 and 22:
C H A P T E R 1■ ■ ■Saving Yo
Page 23 and 24:
CHAPTER 1 ■ SAVING YOURSELF EFFOR
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
C H A P T E R 2■ ■ ■Centraliz
Page 43 and 44:
CHAPTER 2 ■ CENTRALIZING YOUR NET
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62: CHAPTER 2 ■ CENTRALIZING YOUR NET
Page 83 and 84: C H A P T E R 3■ ■ ■Monitorin
Page 85 and 86: CHAPTER 3 ■ MONITORING AND UPDATI
Page 111: CHAPTER 3 ■ MONITORING AND UPDATI
Page 115 and 116: C H A P T E R 4■ ■ ■Taking Ba
Page 117 and 118: CHAPTER 4 ■ TAKING BACKUPS AND MA
Page 139 and 140: C H A P T E R 5■ ■ ■Working w
Page 141 and 142: CHAPTER 5 ■ WORKING WITH FILESYST
Page 155 and 156: C H A P T E R 6■ ■ ■Securing
Page 157 and 158: CHAPTER 6 ■ SECURING YOUR SYSTEMS
Page 163 and 164:
CHAPTER 6 ■ SECURING YOUR SYSTEMS
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
C H A P T E R 7■ ■ ■Working w
Page 179 and 180:
CHAPTER 7 ■ WORKING WITH APACHEOn
Page 181 and 182:
CHAPTER 7 ■ WORKING WITH APACHEdi
Page 183 and 184:
CHAPTER 7 ■ WORKING WITH APACHE4.
Page 185 and 186:
CHAPTER 7 ■ WORKING WITH APACHE
Page 187 and 188:
CHAPTER 7 ■ WORKING WITH APACHEAl
Page 189 and 190:
CHAPTER 7 ■ WORKING WITH APACHE
Page 191 and 192:
C H A P T E R 8■ ■ ■Making Be
Page 193 and 194:
CHAPTER 8 ■ USING THE COMMAND LIN
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
C H A P T E R 9■ ■ ■Working w
Page 207 and 208:
CHAPTER 9 ■ WORKING WITH TEXT IN
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
C H A P T E R 10■ ■ ■Things G
Page 225 and 226:
CHAPTER 10 ■ THINGS GO IN, THINGS
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
C H A P T E R 11■ ■ ■Tracking
Page 235 and 236:
CHAPTER 11 ■ TRACKING DOWN BUGSTh
Page 237 and 238:
CHAPTER 11 ■ TRACKING DOWN BUGS01
Page 239 and 240:
CHAPTER 11 ■ TRACKING DOWN BUGS
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
CHAPTER 11 ■ TRACKING DOWN BUGSTh
Page 247 and 248:
CHAPTER 11 ■ TRACKING DOWN BUGSAn
Page 249 and 250:
CHAPTER 11 ■ TRACKING DOWN BUGS#
Page 251 and 252:
C H A P T E R 12■ ■ ■Managing
Page 253 and 254:
CHAPTER 12 ■ MANAGING TIME AND PE
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
APPENDIX■ ■ ■Perl TipsSee rec
Page 269 and 270:
APPENDIX ■ PERL TIPS• Date::Par
Page 271 and 272:
APPENDIX ■ PERL TIPSPerl Syntax N
Page 273 and 274:
■ ■ ■Index■Symbols$CDPATH,
Page 275 and 276:
■ INDEXenscript option (printing)
Page 277 and 278:
■ INDEX■NNagiosadding hosts to,
Page 279 and 280:
■ INDEXsyslogcentralized logging
Page 281 and 282:
Download at WoweBook.Com
show all

Linux System Administration Recipes A Problem-Solution Approach

Create successful ePaper yourself

Delete template?

Save as template?