H

halt script, 23

Happy Tobi Project, 329

hard option, 296

haresources file. See /etc/ha.d/haresources file

hash buckets, 242

hash table structure, 242

hashing scheduling methods, 202–203

hb_standby command, 160, 180, 324

Healthcheck web page, 272–273

Heartbeat, 112

client computer resource access in, 115–116

configuration, 130–131, 158–159

backup servers, 139–140

/etc/ha.d/authkeys for, 139

/etc/ha.d/ha.cf for, 134–136

/etc/ha.d/haresources for. See /etc/ha.d/haresources file

installation, 132–134

launching, 140–144

ldirectord in, 274–275

preparations for, 132

resource monitoring, 145

stopping and starting, 144–145

system time, 140

testing, 179–181

control messages in, 114–115

deadtime value for, 135, 161

failover in, 161–162

license manager, 162

with Mon, 324–325

GARP broadcasts in, 122–125

for high-availability clusters, 263

informational messages in logs, 161

load sharing with, 154–157

maintenance, 158–162

network failures in, 175–176

operator alerts in, 157–158

physical paths in, 112–114

respawning with, 138, 161–162

scripts for, 125–129

secondary IP addresses and IP aliases in, 116–125

service offers in, 121–122

Stonith for. See Stonith (shoot the other node in the head)

watchdog for, 176–179

hiding loopback interfaces, 261–263

high-availability clusters, 10–11, 255

design goals for, 256–257

Healthcheck web page for, 272–273

Heartbeat installation for, 263

ldirectord. See ldirectord program

loopback interface hiding in, 261–263

LVS-DR, 257–258

NAS server, 364

redundant LVS Directors, 255–256

stateful failover for

of IPVS table, 275–276

modifications for, 277–278

highly available database servers, 365–366

highly available serial devices, 364–365

holdall command, 351

hooks, Netfilter

for load balancer, 244–246

rules for, 34–35

host encryption keys, 72, 79

Host Report web page, 336–337

hostbased authentication, 76

hostname command, 136

hosts

matching packets to, 45–47

virtual, 400–405

HTTP

for iptables and ipchains, 43

with ldirectord, 264

httpd script, 23

hung systems, 176–179

hwclock command, 58

HylaFax program, 361–362, 365