C

cable connections in Heartbeat, 113

caching

attributes, 291

in round-robin DNS, 156

capacity planning, 190–192

case studies, 341

account administration without Active Directory, 342–343

batch job-scheduling systems, 354–357

cluster account authentication mechanisms, 343–345

email, 353–354

fault-tolerant print spoolers, 345–351

rebooting nodes for preventative maintenance, 352–353

cat command, 59

central print servers

custom scripts on, 351

/etc/printcap on, 349–350

LPRng installation on, 347–348

print job management on, 350

centralizing account administration, 189–190

CFS (Cluster File System), 396

CGI programs under Apache, 286

chain policies, 38

checkinterval entry, 268

checkport entry, 271

checktimeout entry, 267–268

checktype entry, 271

chkconfig command, 18–20, 129, 138, 275

CIP (client computer's IP) addresses, 195

cl_respawn utility, 162

client-servers for SSH. See two-node SSH client-servers

clients

access to

in Heartbeat, 115–116

LVS-DR cluster services, 232–236

LVS-NAT cluster resources, 209–216

in data center example, 362–363

for Golden Client, 98–99

for LVS clusters, 194

for LVS-DR clusters and ARP broadcasts, 236–238

NFS configuration options, 296–297

in SystemImager, 108–109

clock skew, 58

cloned systems. See SystemImager package

close-to-open (cto) cache consistency, 291

Cluster File System (CFS), 396

cluster node managers, 5–6

in data center example, 361–362

Ganglia installation on, 330

known_hosts entries on, 355–356

SNMP files on, 317–318

cluster nodes

Apache configuration on, 400–403

configuration changes for, 187

Ganglia for. See Ganglia software package

in Heartbeat configuration, 135–136

least-loaded, 338

load averages for, 334–335

LPRng installations on, 348

monitoring

by ldirectord, 258–261

performance, 189

net-SNMP client software installation on, 310

for print spoolers, 345–347

/etc/printcap file on, 349–350

/etc/printcap.local file on, 348–349

print job management on, 351

purchasing, 190–192

removing, 188, 352

software updates on, 189

sshd_config file on, 355

telnet access to, 353

weight of, 352

cluster transition messages, 114

clusters, 1, 185

architecture of, 4–5

authentication mechanisms for, 343–345

building, 186–192

capacity planning, 190–192

case studies. See case studies

filesystems for, 395–396

high-availability. See high-availability clusters

LVS-DR. See LVS-DR (Linux Virtual Server Direct Routing) clusters

LVS-NAT. See LVS-NAT (Linux Virtual Server Network Address Translation) clusters

partitioned, 113–114

properties of, 2–3

single points of failure in, 6–7

clustersh script, 356

CMF (Content Management Framework), 342

CODA filesystem, 395

command line, testing email from, 354

common Unix printing system, 23

compiling

fping package, 304

kernel, 53

boot loader configuration, 62–64

object code and configuration files for, 60–62

options for, 56–59

process, 59–60

requirements for, 54

source code for, 54–56

Comprehensive Perl Archive Network (CPAN)

for module downloads, 264–266, 306

for Mon package, 305–306

compression methods, 70, 331, 372–374

.config file, 56–57

CONFIG_NFS_DIRECTIO option, 296

configuration files

copying with rsync, 91–92

Heartbeat, 130, 158–159

installing, 60–62

ldirectord, 267–272

connect entry, 271–272

connection templates, 247–248

connection tracking records

for Director, 242–243

timeout values for, 243–244

connections

in Heartbeat, 113

in LVS scheduling, 203

persistent. See persistence

in SSH, 82–86

Content Management Framework (CMF), 342

control messages in Heartbeat, 114–115

converting Unix legacy applications, 192

cooperative locking, 280

copying

encryption keys, 81–82

files with rsync, 89, 91–92

CPAN (Comprehensive Perl Archive Network)

for module downloads, 264–266, 306

for Mon package, 305–306

cron jobs

for batch job-scheduling systems, 356–357

from cluster node manager, 361

for rsync snapshots, 90, 92

crond script, 23, 316, 356

crontab file

for batch job-scheduling systems, 356–357

format of, 92

for rsync snapshots, 90

crossover cable, 112, 132

cto (close-to-open) cache consistency, 291

cups script, 23

custom metrics, 338–340

CustomLog entry, 260