Keepalived 中文权威指南

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§Ïd30Keepalivedƒc§·‚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 192.168.200.17/24 dev eth1 192.168.200.18/24 dev eth2 label eth2:1 } virtual_routes { # src [to] / via|gw dev scope tab src 192.168.100.1 to 192.168.109.0/24 via 192.168.200.254 dev eth1 192.168.110.0/24 via 192.168.200.254 dev eth1 192.168.111.0/24 dev eth2 192.168.112.0/24 via 192.168.100.254 } nopreempt preemtp_delay 300 debug } state state½instanceЩ(Initial)G§3ürouterÑéħêþ ¬u)¿À§ppriority¬¿ÀMaster§¤±ùpstate¿ØL «ùҘ†´Master" interface inside network¢~”½k dont track primary ÑVRRPinterface†Ø(%@ؘ) track interface ˜ i›,p¡?¿˜‡kÑy¯K§Ñ¬? \FAULTG mcast src ip uxõ /Œ,XJؘ§%@¦^”½ k primary IP" garp master delay 3ƒ†MASTERG§ò´?1gratuitous ARPž ¦ virtual router id VRIDIP(0. . . 255) 2.3 KeepAlived˜) 11 priority 100 p`k?¿ÀMASTER§MASTER‡puBACKUP–50 advert int um…,%@1s virtual ipaddress p¡½¤£/Œ(VIP)§Ò´ƒ†MASTERž§ ù IP¬V\§ƒ†BACKUPž§ù IPíØ(D‰ip addr ·-),¤±zÑÖìþŒ±Ø”½?ÛJ[/Œ§ Ñr¦‚ ˜virtual ipaddressp¡(Œ±õ‡)§keepalived¬gĦ^ip addr? 1”½(ØI‡±5ifcfg-eth0),ip addŒ±w virtual routes Úvirtual ipaddress˜§u)ƒ†žV\/íØ´d lvs sync daemon interface lvs syncd”½k authentication ù˜ã˜@y auth type @yª§|±PASSÚAH auth pass @y—è nopreempt ˜ØsÓ§5¿ù‡˜U˜3stateBACKUP ÌÅþ§ …ù‡ÌÅpriority7L', ˜p preempt delay sÓò´§%@5©¨ debug Debug?O notify master Úsync groupp¡˜˜" 2.3.3 LVS˜ LVS˜)2Ü©:J[ÌÅ|(virtual server group)ÚJ[Ì Å(virtual server)"ù ˜Ñ¬D4‰ipvsadmŠëê" J[ÌÅ| ù‡˜ã´ŒÀ§8´ 4˜RealServerþ,‡serviceŒ ±áuõ‡Virtual Server§¿…‰˜gèxu" virtual_server_group { # VIP port 12 KEEPALIVED , fwmark } J[ÌÅ virtual serverŒ±±e¡3«ª¥?¿˜«˜µ 1. virtual server IP port 2. virtual server fwmark int 3. virtual server group string Xe~µ virtual_server 192.168.1.2 80 { # ˜˜‡virtual server: VIP:Vport delay_loop 3 # service pollingdelayž m lb_algo rr|wrr|lc|wlc|lblc|sh|dh # LVSNݎ{ lb_kind NAT|DR|TUN # LVS8+ª persistence_timeout 120 # ¬{±žm(¦) persistence_granularity # LVS¬{±âݧipvsadm¥ -Mëê§%@´0xffffffff§=Šâz‡rà‰¬{±" protocol TCP # ¦^Æ´TCP„´UDP ha_suspend # suspendhealthchecker’s activity virtualhost # HTTP_GET‰èxuž§ uWebÑÖìJ[ÌÅ£=Host:Þ¤ sorry_server # ^ŧ¤kreal server” é^ # zRealServerÑI‡˜‡e¡˜‘ real_server { weight 1 # %@1§0” inhibit_on_failure # 3ÑÖìèxu”} ž§òÙweight˜0§ Ø´†lIPVSp¡íØ" 2.3 KeepAlived˜) 13 notify_up | # 3uÿservice up ‰1 notify_down | # 3uÿservice down ‰1 # e¡˜?¿˜«èxuª:HTTP_GET|SSL_GET|TCP_CHECK|SMTP_CHECK|MISC_CHECK HTTP_GET | SSL_GET { url { # HTTP/SSLuURL§ùpŒ±½õ‡URL path / digest # SSLuÁ‡&E(genhashó äŽÑ) status_code 200 # HTTPuˆ£Gè } connect_port 80 # èxuà # ±d/Œuxž¦éÑÖì?1èxu bindto connect_timeout # 뇞žm nb_get_retry 3 # ­ëgê delay_before_retry 2 # ­ëm…žm£¦¤ } # END OF HTTP_GET|SSL_GET # TCPªèxu TCP_CHECK { connect_port 80 bindto 192.168.1.1 connect_timeout 4 } # TCP_CHECK # SMTP ªèxu SMTP_CHECK # ùp˜¿ÂÚHTTPp¡aq host { connect_ip connect_port # %@u25à 14 KEEPALIVED bindto } connect_timeout retry delay_before_retry # "smtp HELO"ž¦·-ë꧌À" helo_name | } #SMTP_CHECK #MISCèxuª, ‰1˜‡§S MISC_CHECK { # ܧS½´» misc_path | # ‰1‡žžm misc_timeout #XJ˜ misc_dynamic{§ healthchecker§S òÑGè¬^5ÄNÑÖì­(weight). # ˆ£0: èxuOK§­Ø?U # ˆ£1: èxu”}§­0 # ˆ£2-255: èxuOK, ­˜µ òÑGè-2§ 'Xˆ£255§@oweight=255-2=253 misc_dynamic } } # Realserver } # Virtual Server 1nÙ A^¢~ Ù̇0ü«Keepalived¦^§˜«=¦^Keepalived‰HA§˜ «Q‰HAq^5˜LVS" 3.1 ^Keepalived‰HA ^Keepalived‰HA´Xd{ü§·‚¤k°åÑ3˜KeepalivedVRRPf ?§þ§ Œ±Ø+LVS˜"ù!·‚b‰ü$1HAProxy Åì‰HA§JøVIP"eXeµ shared IP=192.168.1.1 192.168.1.3 192.168.1.4 192.168.1.11-192.168.1.14 192.168.1.2 -------+------------+-----------+-----+-----+-----+--------+---- | | | | | | _|_db +--+--+ +--+--+ +-+-+ +-+-+ +-+-+ +-+-+ (___) | LB1 | | LB2 | | A | | B | | C | | D | (___) +-----+ +-----+ +---+ +---+ +---+ +---+ (___) haproxy haproxy 4 cheap web servers keepalived keepalived 3.1.1 HAProxyÚwebÑÖì˜ ù Ü © Ø á u  © ?Ø ‰ Œ S § · ‚  ' 5 3haproxy Å ì þ Keepalivedƒ'˜" 3.1.2 Keepalived˜ bhaporxyÚà webÑÖìÑOÐ §y3Ҍ±m© ˜Keepalived "ù«œ¹e§Ï·‚^KeepalivedHA§=‰virtual 16 A^¢~ routerõU§¤±I‡¤1Ùp¡£ãÛÚVRRP˜=Œ" ˜cI‡O&Eµ 1. VRID—·‚¦^%@511 2. VIP—þã192.168.1.1, VIP=Keepalivedp¡vritual addressip/ Œ 3. LBIP—ùpÒ´ühaproxy/Œ£192.168.1.3Ú1.4§¿bc öMASTER¤ 4. `k?–priority§3õ‡BACKUP¿ÀMASTERžÿ§`k?p ¬¼À"ùpb192.168.1.3`k?150§, ˜100 ¤±§¢S‡˜µ J[IP=192.168.1.1 192.168.1.3 192.168.1.4 192.168.1.11-192.168.1.14 192.168.1.2 -------+-----------------+------------+-----+-----+-----+--------+---- | prio:150 | prio:100 | | | | _|_db +---+----+ +----+---+ +-+-+ +-+-+ +-+-+ +-+-+ (___) | MASTER | | BACKUP | | A | | B | | C | | D | (___) +--------+ +--------+ +---+ +---+ +---+ +---+ (___) haproxy haproxy 4 cheap web servers keepalived keepalived ØsÓ MASTERÑy¯K§BACKUP¬¿À#MASTER§@o ƒcMASTER­#ONLINE§´UY¤MASTER„´C¤BACKUPQº %@œ¹e§XJv˜ØsÓ§@oƒcMASTERå5¬UYsÓ ¤MASTER§Ò´`§‡L§I‡u)2gƒ†µ 1. MASTER->BACKUP 2. BACKUP->MASTER ùé’Öª„ƒ†´ØUN=§Ïd·‚F"MASTERå5§ ¤BACKUPœ¤±‡˜ØsÓ"Keepalivedp¡Jø nopreemptù ‡˜§´ù‡˜U^3stateBACKUPÅìþ§´·‚ 1ý´3$ʛ˜Bœ 3.1 ^Keepalived‰HA 17 ²²F"´MASTERØ?1sÓ§v{§MASTERstate˜ ¤BACKUP"Ò´`192.168.1.3Ú192.168.1.4чòstate˜BACKUPœ @o.X´MASTERºsÓj§ÏLpriority§¤±·‚3üBACKUPþ ¡ÏL˜ØÓpriority54¦‚˜å5ÒsÓ§ppriority192.168.1.3¤ ÐMASTER" SC MASTERÚBACKUPþSCL§˜§¦^e¡·-(ùp b3RedHat Enterprise AS4 Update 4þSC)µ $wget http://www.keepalived.org/software/keepalived-1.1.17.tar.gz $tar xzvf keepalived-1.1.17.tar.gz $cd keepalived-1.1.17 $./configure --prefix=/ \ --mandir=/usr/local/share/man \ --with-kernel-dir=/usr/src/kernels/2.6.9-67.EL-smp-i686/ $make #make install #cp keepalived/etc/init.d/keepalived.rh.init /etc/init.d/keepalived #chmod +x /etc/init.d/keepalived #cp keepalived/etc/init.d/keepalived.sysconfig /etc/sysconfig/keepalived #chkconfig --add keepalived #chkconfig --level 345 keepalived on MASTER˜ MASTER˜—192.168.1.3˜ global_defs { notification_email { finalbsd@gmail.com } notification_email_from finalbsd@gmail.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id haproxy-ha 18 A^¢~ } vrrp_sync_group VG1 { group { VI_1 } } vrrp_instance VI_1 { state BACKUP smtp_alert notify_fault "/root/script/notify_mail.sh fault" notify_master "/root/script/notify_mail.sh master" nopreempt interface eth1 track_interface { eth0 eth1 } virtual_router_id 51 priority 150 advert_int 1 authentication { auth_type PASS auth_pass fsaf..7&f } virtual_ipaddress { 192.168.1.1/24 dev eth1 scope global } } BACKUP˜ BACKUP˜—192.168.1.4˜ BACKUP˜ÚMASTERʧk2‡ØÓ:µ 1. priority ˜100 3.2 ^Keepalived˜LVS 19 2. ؘnopreempt éÄÑÖ ©O3üþ‰1service keepalived startéÄÑÖ" 3.2 ^Keepalived˜LVS ·‚be¡œ/µ 4webÑÖìÏL˜éLVS?1NݧLVS=uªNAT"˜éLVSÏ LKeepalived‰HA§ J[IP=192.168.1.1 192.168.1.3 192.168.1.4 192.168.1.11-192.168.1.14 192.168.1.2 -------+-----------------+------------+-----+-----+-----+--------+---- | prio:150 | prio:100 | | | | _|_db +---+----+ +----+---+ +-+-+ +-+-+ +-+-+ +-+-+ (___) | MASTER | | BACKUP | | A | | B | | C | | D | (___) +--------+ +--------+ +---+ +---+ +---+ +---+ (___) LVS LVS 4 cheap web servers 3LVS¥§õ A‡Vgµ virtual server Ò´VIP+VPORT§VIPI‡ÏLVRRPD˜ã?1 ˜" real server ùpLVSNÝwebÑÖìIP/Œ§=ã¥192.168.11–14 lb algo Nݎ{§ùp¦^wlc lb kind =uª§ùp¦^NAT weight ­§%@ùpј3 SC SCÚþ˜!3.1.2ùSC˜§ùpØ2Kã" 20 A^¢~ MASTERÚBACKUP˜ KeepalivedÛÚvrrp˜ãÚc˜!3.1.2˜§ùp·‚I ‡V\virtual server˜ãµ virtual_server 192.168.1.1 80 { delay_loop 3 lb_algo wlc lb_kind DR persistence_timeout 1200 protocol TCP ha_suspend real_server 192.168.1.11 80 { weight 3 TCP_CHECK { connect_timeout 3 } } real_server 192.168.1.12 80 { weight 3 TCP_CHECK { connect_timeout 3 } } } ë©z [1] RFC 3768 — Virtual Router Redundancy Protocol (VRRP) [2] man 5 keepalived.conf [3] man 8 keepalived [4] www.keepalived.org [5] keepalived “è 22 ë©z