Keepalived 中文权威指南

chrrity

贡献于2012-06-26

字数:0 关键词: 网络技术

1 KEEPALIVED %H Keepalived: The Definitive Guide Šöµ FinalBSD(Kevin Kuang) ooÊcn www.sanotes.net 3 Kevin Kuang Pk‡ c 2009 ±9Ö¤ku1‡"3¤k|" ù°© ´¤¶3gd^‡|„…Ù GNU Ï^чNŒy^±e§ \Œ±2‡½ö?U§"NŒyŒ±´1‡§½ö?ÛU‡£‘\¿¤" 8¹ 1 VRRP 1 1.1 VRRPÆ{0 .......................... 1 1.2 óŠÅ› ............................. 2 2 KEEPALIVED 3 2.1 KeepalivedOÚ¢y ..................... 3 2.1.1 õ?§ª ........................ 4 2.1.2 ››¡† ......................... 4 2.1.3 WatchDog ......................... 4 2.1.4 IPVSµC......................... 4 2.2 KeepAlivedSC........................ 5 2.3 KeepAlived˜)....................... 6 2.3.1 Û˜ ......................... 7 2.3.2 VRRPD˜ ....................... 8 2.3.3 LVS˜ .......................... 11 3 A^¢~ 15 3.1 ^Keepalived‰HA ........................ 15 3.1.1 HAProxyÚwebÑÖì˜ ............... 15 3.1.2 Keepalived˜ ...................... 15 3.2 ^Keepalived˜LVS ...................... 19 ë©z 21 1˜Ù VRRP Keepalived´VRRP{¢y§Ïd30 Keepalivedƒc§·‚k7 ‡k )VRRPn" )VRRPÐ© #LuVRRPRFC© 1" 1.1 VRRPÆ{0 3y¢䂸¥('XInternet)§üI‡Ï&ÌÅ(end-host)Œ õꜹe¿vk†Ônë"éuùœ¹§§‚ƒm´dN oÀJºÌÅXÛÀ½ˆ8ÌÅe˜a´d§ù´˜‡¯K"Ï~ )û{kü«µ • 3ÌÅþ¦^Ä´dÆ('XRIP,OSPF) • 3ÌÅþ˜·´d é²w§3ÌÅþ˜Ä´dÆ´š~؃¢S§Ï+n! ‘o¤±9´Ä|±Ãõ¯K"@o˜·´dÒC›©6 1"¢Sþ§ù«ª·‚–8˜†3^"´§´dì(½ö`%@ 'default gateway)%²~¤ü:"Ҏ˜ õ‡·´d§%Ϗ7 L­éäâU) CØ¢^" VRRP8Ò´ )û·´dü:æ¯Kœ VRRPÏL˜«¿À(election)Æ5Äò´d?Ö‰LAN¥J [´dì¥,VRRP´dì"ùpwå5é7§Ïkü‡'…¶ c:J[´dìÚVRRP´dì" VRRP´dì VRRP´dìÒ´˜´d짐ØLþ¡$1 VRRPDù§S 5¢yVRRPÆ ®§ù´Ôn´dì"˜VRRP´d쌱 uõ ‡J[´dì" 1´RFC 3768 Ø´2338§XJ\U§Òw2338j 2 VRRP VRRPJ[´dì ¤¢J[§Ò´`¿Ø´¢S3§´˜‡Ü6 Ø´Ôn´d ì"J[´dìÏ~dõ(Ôn)VRRP´dìÏL,«ª|¤§ÒÐ 'ù Ôn´dìÑ¿˜‡³(pool)p¡§‡poolé wå5Җ ´˜´dì§Ù¢SÜkõ"J[´dìI£¡VRID" MASTERÚBACKUP 3˜‡VRRPJ[´d쥧kõÔnVRRP´d짴ùõ ÔnÅì¿ØӞóŠ2§ ´d˜¡MASTERKI´dóŠ§Ù ¦Ñ´BACKUP§MASTER¿š˜¤ØC§VRRPÆ4z‡VRRP´ dì놿À§ª¼‘Ò´MASTER"MASTERk˜ A3§'X PkJ[´dìIP/Œ§·‚ÌÅÒ´^ù‡IP/ŒŠ·´d "PkAMASTER‡KI=uux‰'/ŒÚAARPž ¦" 1.2 óŠÅ› VRRPÏL¿ÀÆ5¢yJ[´dìõU§¤kÆ©Ñ´ ÏLIPõÂ(multicast)£õÂ/Œ224.0.0.18¤/ªux"J[´dì dVRID(‰Œ0–255)ژ|IP/Œ|¤§é Ly˜‡±MAC/ Œµ00-00-5E-00-01-{VRID} 4"¤±§3˜‡J[´d쥧Ø+X ´MASTER§é Ñ´ƒÓMACÚIP(¡ƒVIP)"ràÌÅ¿Ø I‡ÏMASTERUC ?UgC´d˜§é¦‚5`§ù«Ìl ƒ†´ß²" 3˜‡J[´d쥧kŠMASTERVRRP´d쬘†u xVRRP2w(VRRP Advertisement message)§BACKUPجsÓMASTER§ ؚ§`k?(priority)p"MASTER،^ž£BACKUPÂØ2 w¤§õBACKUP¥`k?pù¬sӏMASTER"5"ù «sÓ´š~¯„(<1s)§±yÑÖëY5" ÑuS5ħVRRP¦^ \—Æ?1\—" 2¦+ùwå5éL¤ 3PŒo´kA 4ùÒ´Ÿo¡˜virtual router idŸoU´0. . . 255 5ù`² ŸoI‡state§kI‡priorityù˜ 1Ù KEEPALIVED KeepalivedOÚ¢y,{ü§´˜kاÙ̇Ò ãù " 2.1 KeepalivedOÚ¢y Keepalived´˜‡pݬzO^‡§ “è(qéN´ wÑù˜:§p¡k check core libipfwc libipvs-2.4 libipvs-2.6 vrrp ùo˜ 8¹" 4 KEEPALIVED core keepalivedØ%§S§'XÛ˜)Û§?§éĶ vrrp Keepalivedvrrpdf?§±9ƒ'“è" check keepalivedhealthcheckerf?§8¹§) ¤kèxu ª±9éA˜)Û§LVS˜)ۏ3ù‡p¡ libipfwc iptables(ipchains)¥§Ì‡^5˜LVS¥firewall-mark" libipvs* ´¦^LVSI‡^" 2.1.1 õ?§ª keepalivedæ^ õ?§Oª§z‡?§KIØÓõU§·‚ 3¦^LVSÅìþÏ~Œ±wù?§µ 111 Keepalived < I?§:S+n§i›f?§ 112 \_ Keepalived < VRRPf?§ 113 \_ Keepalived < healthcheckerf?§ k ·-1ëê5››Ømé, ?§§'XØ$1LVSÅìþ§m éVRRPҌ± (–P), XJ$1healthcheckerf?§,¦^–C" 2.1.2 ››¡† ¤¢››¡†Ò´é˜©‡?ÈÚ)Û§Keepalived˜© ‡)Û',a§¿Ø´˜gÚÚ)Û¤k˜§3^,¬ž ÿâ)ۃA˜§3z‡¬p¡ÑŒ±wXXX parser.cù© ‡§Ò´‰ù‡Š^" 2.1.3 WatchDog ù«µeJø éf?§(VRRPÚhealthchecker)i›. 2.1.4 IPVSµC Keepalivedp¡¤kéLVSƒ'öŠ¿Ø†¦^ipvsadmù ^rà§S§ ´†¦^IPVSJø¼ê?§öŠ§ù “èÑ 3check/ipwrapper.c¥" 2.2 KeepAlivedSC 5 2.2 KeepAlivedSC SCKeepalivedÚSCÙ¦m ^‡˜§š~{ü§configure§make§make installҌ±t½§´·‚„´I‡{ü`²˜eù‡öŠL§µ ./configure --prefix=/ \ --mandir=/usr/local/share/man \ --with-kernel-dir=/usr/src/kernels/2.6.9-67.EL-smp-i686/ make make install `²Xeµ 1. prefix ù‡½/j§ù˜©‡¬˜8¹e§BöŠ" 2. mandir ù‡˜LinuxXÚ%@man8¹e§Bw" 3. with-kernel-dir ù´‡­‡ëê§ù‡ëê¿ØL«·‚‡r :XJ‡^LVS§âI‡ù ½§ÄK´ØI‡§ …XJ‡¦ ^netlink§„I‡link watch.cù‡ ©‡ Keepalived??Sا ´¦^SØ èp¡Þ©‡§Ò ´include8¹" 3confiure(‰1§Œ±e¡Ñѵ Keepalived configuration ------------------------ Keepalived version : 1.1.15 Compiler : gcc Compiler flags : -g -O2 Extra Lib : -lpopt -lssl -lcrypto Use IPVS Framework : Yes IPVS sync daemon support : Yes Use VRRP Framework : Yes Use LinkWatch : Yes Use Debug flags : No  5¿ Use IPVS Framework IPVSµe—=LVSØ%“èµe§XJØ ¦^LVS§Œ±3configurež½ëêdisable-lvs§ù{§ùpw Ò´No Ø´Yes" 6 KEEPALIVED IPVS sync daemon support IPVSÓÚ?§§éw,§XJc¡@‘ ´No{§@oùp’½´No§,XJc¡ù‘´Yes–=¦ ^LVS§ ؎¦^LVSÓÚ?§(sync daemon), Œ±3configure žÿ½disable-lvs-syncd" Use VRRP Framework VRRPµe§ùÄþ´7L§Keepalived Ø%?§vrrpd" Use LinkWatch ¤¢LinkwatchŒV¿g´ÏLÂSØuÑ'u kG&E5äkG§Ï´SØuÑ&E§ù3^ ràI‡ÓPù &E=Œ§ƒ'†3^ràÏLÙ¦ª5 ¢ywå5¬Ž] §Keepalived3k‡L20¬œ¹eí¦ ^"1 { óƒ§XJئ^LVSõU§@o‡wUse VRRP Frame- workYesҌ±§‡ƒ§7LkUse IPVS FrameworkYes§Ù¦Ñ ´optional" SCÄÒùo{ü§´\ŒU„k¦¯§.3=pe1Keepalivedº †Keepalived(ejµwww.keepalived.org 2.3 KeepAlived˜) Keepalived¤k˜Ñ3˜‡˜©‡p¡˜§|±˜‘' õ"©naµ 1. Û˜(Global Configuration) 2. VRRPD˜ 3. LVS˜ é²w§Û˜Ò´é‡keepalived嘧Ø+´Ä¦ ^LVS"VRRPD´keepalivedØ%§LVS˜3‡¦^keepalived5 ˜Ú+nLVSžI‡¦^§XJ=¦^keepalived5‰HA2§LVS˜ ´ØI‡" ˜©‡Ñ´±¬(block)/ª|„§z‡¬Ñ3{Ú}Œ‰Œ S"#Ú!mÞ1Ñ´5º" 1I ‡link watch.cù ‡ © ‡ § d © ‡ 3LinuxSØ  “ è ¥ § ´ » a q/usr/src/kernels/2.6.9-67.EL-smp-i686/net/core/ link watch.c 2'X`‰˜éHAProxyHA½öÙ¦aqHA 2.3 KeepAlived˜) 7 2.3.1 Û˜ Û˜)ü‡f˜§=¤¢µÛ½Â(global definition)Ú· /Œ´d(static ipaddress/routes) ۽ Û½Â̇˜keepalivedÏśÚI£µ global_defs { notification_email { admin@example.com } notification_email_from admin@example.com smtp_server 127.0.0.1 stmp_connect_timeout 30 router_id my_hostname } • notification email½keepalived3u)¯‡('Xƒ†)ž§I‡u xemail閧Œ±kõ‡§z1˜‡" • smtp *½uxemailsmtpÑÖì§XJ/mé sendmail{§ Œ±¦^þ¡%@˜" • route id$1keepalivedÅ옇I£" ·/ŒÚ´d ¤¢·(static)Ò´`ج‘vrrpd instancem/' Cz§VIPÒ Ø´static§¬‘Xvrrpd V\/íØ"ù‡˜Œ±^5‰ÑÖì˜ ·IP/Œ/´d§,XJÑÖì˜p¡®²kù ˜§ùpÒ ØI‡˜ " static_ipaddress { 192.168.1.1/24 brd + dev eth0 scope global 8 KEEPALIVED ... } static_routes { src $SRC_IP to $DST_IP dev $SRC_DEVICE ... src $SRC_IP to $DST_IP via $GW dev $SRC_DEVICE } z˜1˜˜‡IP§ù ˜Ñ´Linuxeipù‡·-ëê§'Xþ ¡192.168.1.1/24 brd + dev eth0 scope global§keepalivedª¬ †¦^ip addr add 192.168.1.1/24 brd + dev eth0 scope global5V\§¤ ±ùp˜Ñ‡ÎÜip·-5K" ùÒ´Û˜ãÜ" 2.3.2 VRRPD˜ VRRPD˜)2Ü©:VRRPÓÚ|(synchroization group)ÚVRRP¢ ~(VRRP Instance)" VRRP Sync Groups(s) ئ^Sync Group{,XJÅì(½ö`router)kü‡㧘‡ S˜‡ ,z‡ãm阇VRRP¢~§bVRRP˜uS §@o Ñy¯Kž§VRRPD@gCE,èx§@oجu xMasterÚBackupƒ†§l — ¯K"Sync groupÒ´ )ûù ‡¯K§Œ±rü‡¢~ј?˜‡Sync Group§ù{§groupp¡? ۘ‡¢~Ñy¯KѬu)ƒ†" vrrp_sync_group VG_1 { group { inside_network # ùp´¢~¶('XVI_1) outside_network , } notify_master /path/to/to_master.sh notify_backup /path_to/to_backup.sh notify_fault "/path/fault.sh VG_1" 2.3 KeepAlived˜) 9 notify /path/to/notify.sh smtp_alert } • notify master ½ƒ†Masterž§‰1 §ù‡ Œ±D \ëê(ÚÒÚå)§Ù¦2‡aí" • notify-k3‡ëê§ù ëêdkeepalivedJøµ$1(GROUP—INSTANCE),$2(group½ öinstance¶i),$3(MASTER—BACKUP—FAULT) • smtp alter ¦^global defsp¡½Âe‡/ŒÚsmtpÑÖì3ƒ† uxe‡Ï" VRRP¢~(instance)˜ VRRP¢~ÒL«3þ¡mé VRRPƧù‡¢~`² VRRP ˜ A5§'XÌl!VRID§Œ±3z‡interfaceþm阇¢ ~"VRRP¢~˜Ì‡½Âvrrp sync groupp¡z‡|¤£IP" vrrp_instance inside_network { state MASTER interface eth0 dont_track_primary track_interface { eth0 eth1 } mcast_src_ip garp_master_delay 10 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS autp_pass 1234 10 KEEPALIVED } virtual_ipaddress { #/ brd dev scope label

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