R

random script, 26

rankings in weighted round-robin scheduling, 202

rawdevices script, 26

rc program, 17

reads in fcntl locking, 282

real entry, 269–270

real IP (RIP) addresses, 195

real servers

Apache configuration and starting on, 218–219

default route setting on, 219–220

Directors as, 227–229

ldirectord for, 258–261

for LVS clusters, 194

stateful failover modifications for, 277–278

virtual IP addresses on, 214–216

rebooting

for preventative maintenance, 352–353

with watchdog, 178

red cluster nodes, 335

Red Hat init scripts, 21–31

redirection URLs, 403–404

redundant LVS Directors, 255–256

refreshing Ganglia Web package, 333

rehash command, 382

relative path names for links, 403

reload command, 129

removing

cluster nodes, 188, 352

services, 21

resource groups, file, 153

resources

in Heartbeat

client computer access to, 115–116

in haresources file, 152–154

monitoring, 145

scripts for, 125–129

LVS-NAT cluster, accessing, 209–216

respawn entry, 162

respawn hacluster entry, 176

respawning

in Heartbeat, 138, 161–162

services, 18

restart command, 129

retransmission request messages, 115

return packets, 244–246

reverse DNS queries, 404

rexmit-request messages, 115

rhnsd script, 27

RIP (real IP) addresses, 195

rm command, 56

root filesystems, 63–64

round-robin DNS, 155–157

round-robin (RR) scheduling methods, 202

route command, 47

routes and routing

default, 44

for iptables, 47–50

for LVS-NAT clusters, 219–220

packets. See packets and packet routing

rules for, 47

routing start command, 50

routing status command, 50

rpm command, 77

rpm files, 373

.rpm.bz file, 372

.rpm.bz2 file, 372

.rpm.gz file, 372

rpm packages

installing, 392–393

shared libraries for, 390–391

rps10 device, 168

RR (round-robin) scheduling methods, 202

RRDtool, 329

rstatd script, 27

rsync command

for batch jobs, 292

for copying files, 89, 91–92

over slow WAN connections, 89–90

snapshots with, 90–92

with SSH. See SSH (secure shell)

synchronizing servers with, 69–70

in SystemImager servers, 106

rules for iptables and ipchains, 39

DNS, 41

email, 42–43

FTP, 40–41

HTTP, 43

ICMP, 43

INPUT policy, 39–40

reviewing and saving, 43–44

SSH, 42, 92–93

telnet, 42

runlevel command, 17

rup command, 27

rusersd script, 27

rwall script, 27

rwhod script, 27