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keepalived：实现对haproxy服务的高可用，并采用双主模型配置;haproxy：实现对nginx的负载均衡和读写分离;nginx：实现对http请求的高速处理;架构设计图重点概念vrrp_script中节点权重改变算法vrrp_script里的script返回值为0时认为检测成功，其它值都会当成检测失败；weight为正时，脚本检测成功时此weight会加到priority上，检测失败时不加；主失败:主priority从priority+weight时，主依然为主weight为负时，脚本检测成功时此weight不影响priority，检测失败时priority–abs(weight)主失败:主priority–abs(weight)从priority主依然为主具体解释详见博文“keepalived双主模型中vrrp_script中权重改变故障排查”部署配置keepalived部署配置001.yum-yinstallkeepalived#两节点都需部署002.#172.16.25.109003.#vi/etc/keepalived/keepalived.conf004.!configurationfileforkeepalived005.global_defs{006.notification_email{007.root@localhost008.}009.notification_email_fromadmin@lnmmp.com010.smtp_connect_timeout3011.smtp_server127.0.0.1012.router_idlvs_devel013.}014.vrrp_scriptchk_maintaince_down{015.script"[[-f/etc/keepalived/down]]&&exit1||exit0"016.interval1017.weight2018.}019.vrrp_scriptchk_haproxy{020.script"killall-0haproxy"021.interval1022.weight2023.}024.vrrp_instancevi_1{025.interfaceeth0026.statemaster027.priority100028.virtual_router_id125029.garp_master_delay1030.authentication{031.auth_typepass032.auth_pass1e3459f77aba4ded033.}034.track_interface{035.eth0036.}037.virtual_ipaddress{038.172.16.25.10/16deveth0labeleth0:0039.}040.track_script{041.chk_haproxy042.}043.notify_master"/etc/keepalived/notify.shmaster172.16.25.10"044.notify_fault"/etc/keepalived/notify.shfault172.16.25.10"045.}046.vrrp_instancevi_2{047.interfaceeth0048.statebackup049.priority99050.virtual_router_id126051.garp_master_delay1052.authentication{053.auth_typepass054.auth_pass7615c4b7f518cede055.}056.track_interface{057.eth0058.}059.virtual_ipaddress{060.172.16.25.11/16deveth0labeleth0:1061.}062.track_script{063.chk_haproxy064.chk_maintaince_down065.}

lvs linux vitual server