一、IPVS的单主高可用
(1)配置RS,我们使用两台服务器作为RS服务器配置过程我们可以使用脚本来配置,这样当我们完成试验后便于卸载,脚本如下:
#!/bin/bash # vip=192.168.125.198 #你用的虚拟路由的IP地址 case $1 in start) echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 1 > /proc/sys/net/ipv4/conf/all/arp_announce echo 1 > /proc/sys/net/ipv4/conf/lo/arp_announce ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up route add -host $vip dev lo:0 ;; stop) ifconfig lo:0 down echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce ;; *)echo "Usage: $(basename $0) start|stop" exit 1 ;; esac
接下来我们可以配置keepalived服务器两台服务器配置大多是相通的,只需修改少量配置参数即可[email protected] keepalived]# vim /etc/keepalived/keepalived.conf! Configuration File for keepalived
#全局配置段 global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 15 router_id node1 vrrp_mcast_group4 224.0.192.100 } #配置虚拟IP vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 11 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 11111111 } virtual_ipaddress { 192.168.125.198/24 dev ens33 label ens33:0 } track_interface { ens33 } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } vrrp_instance VI_2 { state BACKUP interface ens33 virtual_router_id 21 priority 98 advert_int 1 authentication { auth_type PASS auth_pass 18181818 } virtual_ipaddress { 192.168.125.199/24 dev ens33 } track_interface { ens33 } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } #定义虚拟服务器 virtual_server 192.168.125.198 80 { delay_loop 2 lb_kind DR lb_algo rr protocol TCP sorry_server 127.0.0.1 80 real_server 192.168.125.156 80 { weight 1 HTTP_GET { url { path / status_code 200 } nb_get_retry 3 delay_before_retry 1 connect_timeout 3 } } real_server 192.168.125.157 80 { weight 2 HTTP_GET { url { path / status_code 200 } nb_get_retry 3 delay_before_retry 1 connect_timeout 3 } } }
最后完成测试即可;
二、keepalived+nginx的高可用集群服务
(1)分析:在做此实验时我们不仅要监控节点我们还需要监控节点上nginx是否可用,这就需要我们调用脚本来监控他们,首先我们做通知脚本示例如下:
#!/bin/bash
#实现通知脚本
contact=‘[email protected]‘
notify() {
local mailsubject="$(hostname) to be $1, vip floating"
notify() {
local mailsubject="$(hostname) to be $1, vip floating"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
systemctl restart nginx
;;
fault)
notify fault
;;
*)
echo "Usage: $(basename $0) {master|backup|fault}"
exit 1
;;
esac
(2) 脚本调用方法如下:
第一步将脚本放在/etc/keepalived/下并给执行权限
第二步编辑配置文件:vim /etc/keepalived/keepalived.conf
第三步:在vrrp_instance 的上下文编写如下语句:
track_interface {
ens33
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
(3)接着我们要完成脚本监控nginx服务:
keepalived调用外部辅助脚本进行资源监控,并根据监控的结果状态能实现优先级的动态调整:
分两步: (1)先定义一个脚本
(2)调用此脚本
vrrp_script <SCRIPT_NAME> {
script “”
interval INT #返回值0或者1
weight -INT
}
track_script {
SCRIPT _NAME_1
SCRIPT_NAME_2
.....
}
最后我们在上一个脚本的backup下加一行重启nginx服务的命令就可以起到一定的排错能力,如果是nginx服务听了他可以自动帮我们讲服务重启。
(4)接着我们要配置nginx的反代服务这个是在keepalived的两台服务器上做:
编辑代理服务器nginx的主配置文件:vim /etc/nginx/nginx.conf
在http上下文编辑:
upstream websrvs {
server 192.168.125.156:80 weight=1;
server 192.168.125.157:80 weight=1;
}
记着:nginx -s reload
在server段的location中写下:proxy_pass http://websrvs;
(5)接着编辑反代服务器的keepalived 文件:
! Configuration File for keepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 15 router_id node1 vrrp_mcast_group4 224.0.192.100 } vrrp_script chk_nginx { script "killall -0 nginx" interval 1 weight -5 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 11 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 11111111 } virtual_ipaddress { 192.168.125.198/24 dev ens33 label ens33:0 } track_interface { ens33 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } vrrp_instance VI_2 { state BACKUP interface ens33 virtual_router_id 21 priority 98 advert_int 1 authentication { auth_type PASS auth_pass 18181818 } virtual_ipaddress { 192.168.125.199/24 dev ens33 } track_interface { ens33 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" }
另一个发代节点也这样编辑就可以完成然后启动keepalived服务即可。
原文地址:https://www.cnblogs.com/sanqianfanhua01/p/9094112.html