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下文給大家帶來實現keepalived雙主模型lvs高可用集群的實驗總結，希望能夠給大家在實際運用中帶來一定的幫助，負載均衡涉及的東西比較多，理論也不多，網上有很多書籍，今天我們就用億速云在行業內累計的經驗來做一個解答。
實現keepalived雙主模型lvs高可用集群
一、拓撲圖
二、環境準備
兩臺負載均衡調度器，兩臺web云服務器。
調度器A環境:
VS:一張網卡
DIP:192.168.0.7/24
VIP（主）：192.168.0.200
VIP(備)：192.168.0.201
軟件包：yum install -y keepalived ipvsadm nginx(作用：sorry-server服務)
調度器B環境：
VS:一張網卡
DIP:192.168.0.8/24
VIP（主）：192.168.0.201
VIP(備)：192.168.0.200
軟件包：yum install -y keepalived ipvsadm nginx(作用：sorry-server服務)
web服務器A環境：
RS1:192.168.0.3
lo:0:192.168.0.200
lo:1:192.168.0.201
軟件包：yum install -y httpd
web服務器B環境：
RS1:192.168.0.4
lo:0:192.168.0.200
lo:1:192.168.0.201
軟件包：yum install -y httpd
三、配置
調度器A配置
主要操作：ip配置，時間同步、hosts文件更改，修改主機名（確保主從節點能夠通信）、keepalived.conf配置文件更改，通知腳本配置(兩個腳本)，ipvsadm規則查看
ip配置
[root@node1keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:0c:d2:06 brd ff:ff:ff:ff:ff:ff inet 192.168.0.7/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.0.200/24 scope global secondary ens33:1 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe0c:d206/64 scope link valid_lft forever preferred_lft forever
時間同步
ntpdate ntp-server-ip #時間服務器的ip
hosts文件
[root@node1 keepalived]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 node1 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 node1 192.168.0.8 node2 192.168.0.7 node1
主機名修改
hostnamectl set-hostname node1
keepalived.conf配置文件更改
[root@localhost keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 10
router_id node1
vrrp_mcast_group4 224.0.0.223
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 110
advert_int 1
authentication {
auth_type PASS
auth_pass JzvnmfkY
}
virtual_ipaddress {
192.168.0.200/24 dev ens33 label ens33:1
}
notify_master "/etc/keepalived/notify1.sh master"
notify_backup "/etc/keepalived/notify1.sh backup"
notify_fault "/etc/keepalived/notify1.sh fault"
}
virtual_server 192.168.0.200 80 {
delay_loop 3
lb_algo wrr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.0.3 80 {
weight 2
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.0.4 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
vrrp_instance VI_2 {
state BACKUP
interface ens33
virtual_router_id 52
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass JzvnmfkY
}
virtual_ipaddress {
192.168.0.201/24 dev ens33 label ens33:2
}
notify_master "/etc/keepalived/notify2.sh master"
notify_backup "/etc/keepalived/notify2.sh backup"
notify_fault "/etc/keepalived/notify2.sh fault"
}
virtual_server 192.168.0.201 80 {
delay_loop 3
lb_algo wrr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.0.3 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.0.4 80 {
weight 2
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}通知腳本配置
腳本1
[root@node1 keepalived]# cat notify1.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.200
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp1 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac腳本2
[root@node1 keepalived]# cat notify2.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.201
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp2 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esacipvsadm規則查看
[root@node1 keepalived]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.0.200:80 wrr -> 192.168.0.3:80 Route 2 0 0 -> 192.168.0.4:80 Route 1 0 0 TCP 192.168.0.201:80 wrr -> 192.168.0.3:80 Route 1 0 0 -> 192.168.0.4:80 Route 2 0 0
調度器B配置
主要操作：ip配置，時間同步、hosts文件更改，修改主機名（確保主從節點能夠通信）、keepalived.conf配置文件更改，通知腳本配置(兩個腳本)，ipvsadm規則查看
ip配置
[root@node2 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:3f:e3:9e brd ff:ff:ff:ff:ff:ff inet 192.168.0.8/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.0.201/24 scope global secondary ens33:2 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe3f:e39e/64 scope link valid_lft forever preferred_lft forever
時間同步
ntpdate ntp-server-ip
hosts文件更改
[root@node2 keepalived]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 node2 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 node2 192.168.0.7 node1 192.168.0.8 node2
主機名修改
hostnamectl set-hostname node2
keepalived.conf配置文件更改
[root@localhost keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 10
router_id node2
vrrp_mcast_group4 224.0.0.223
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass JzvnmfkY
}
virtual_ipaddress {
192.168.0.200/24 dev ens33 label ens33:1
}
notify_master "/etc/keepalived/notify1.sh master"
notify_backup "/etc/keepalived/notify1.sh backup"
notify_fault "/etc/keepalived/notify1.sh fault"
}
virtual_server 192.168.0.200 80 {
delay_loop 3
lb_algo wrr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.0.3 80 {
weight 2
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.0.4 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
vrrp_instance VI_2 {
state MASTER
interface ens33
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass JzvnmfkY
}
virtual_ipaddress {
192.168.0.201/24 dev ens33 label ens33:2
}
notify_master "/etc/keepalived/notify2.sh master"
notify_backup "/etc/keepalived/notify2.sh backup"
notify_fault "/etc/keepalived/notify2.sh fault"
}
virtual_server 192.168.0.201 80 {
delay_loop 3
lb_algo wrr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.0.3 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.0.4 80 {
weight 2
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}通知腳本配置(同調度器A的腳本一致)
腳本1
[root@node2 keepalived]# cat notify1.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.200
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp1 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac腳本2
[root@node2 keepalived]# cat notify2.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.201
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp2 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esacweb服務器A配置
ip配置
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet 192.168.0.201/32 brd 192.168.0.201 scope global lo:1 valid_lft forever preferred_lft forever inet 192.168.0.200/32 brd 192.168.0.200 scope global lo:0 valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ab:50:14 brd ff:ff:ff:ff:ff:ff inet 192.168.0.4/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:feab:5014/64 scope link valid_lft forever preferred_lft forever
lvs-dr-預配置腳本
腳本1
[root@localhost ~]# cat vip200-setrs.sh #!/bin/bash # vip=192.168.0.200 mask='255.255.255.255' 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 2 > /proc/sys/net/ipv4/conf/all/arp_announce echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce ifconfig lo:0 $vip netmask $mask broadcast $vip 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
腳本2
[root@localhost ~]# cat vip201-setrs.sh #!/bin/bash # vip=192.168.0.201 mask='255.255.255.255' 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 2 > /proc/sys/net/ipv4/conf/all/arp_announce echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce ifconfig lo:1 $vip netmask $mask broadcast $vip up route add -host $vip dev lo:1 ;; stop) ifconfig lo:1 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
web服務器B配置
ip配置
[root@localhost ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet 192.168.0.201/32 brd 192.168.0.201 scope global lo:1 valid_lft forever preferred_lft forever inet 192.168.0.200/32 brd 192.168.0.200 scope global lo:0 valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ab:50:14 brd ff:ff:ff:ff:ff:ff inet 192.168.0.4/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:feab:5014/64 scope link valid_lft forever preferred_lft forever
lvs-dr-預設腳本
腳本內容同web服務A相同，拷貝過去即可
vip200-setrs.sh vip201-setrs.sh
客戶端測試
ip配置
[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:d0:37:77 brd ff:ff:ff:ff:ff:ff inet 192.168.0.14/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fed0:3777/64 scope link valid_lft forever preferred_lft forever
curl測試
[root@localhost ~]# for i in {1..10};do curl http://192.168.0.200;done
backend server1
backend server1
backend server2
backend server1
backend server1
backend server2
backend server1
backend server1
backend server2
backend server1
[root@localhost ~]# for i in {1..10};do curl http://192.168.0.201;done
backend server1
backend server2
backend server2
backend server1
backend server2
backend server2
backend server1
backend server2
backend server2
backend server1四、健康狀態查看以及故障排查參考方式
方式1：查看keepalived的切換過程
systemctl status keepalived
方式2：mail命令查看郵件
方式3：查看web服務器日志
tail /var/log/httpd/access_log
tail /var/log/httpd/error_log
五、模擬故障
1.模擬調度器B故障
調度器B上操作
停止keepalived服務
systemctl stop keepalived [root@node2 keepalived]# systemctl status keepalived #分析以下信息，VIP2已移除 Jul 02 10:18:53 node2 systemd[1]: Stopping LVS and VRRP High Availability Monitor... Jul 02 10:18:53 node2 Keepalived_vrrp[50773]: VRRP_Instance(VI_2) sending 0 priority Jul 02 10:18:53 node2 Keepalived_vrrp[50773]: VRRP_Instance(VI_2) removing protocol VIPs. Jul 02 10:18:53 node2 systemd[1]: Stopped LVS and VRRP High Availability Monitor.
查看ip
[root@node2 keepalived]# ip a #VIP2移除 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:3f:e3:9e brd ff:ff:ff:ff:ff:ff inet 192.168.0.8/24 brd 192.168.0.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe3f:e39e/64 scope link valid_lft forever preferred_lft forever
調度器A操作
[root@node1 keepalived]# systemctl status keepalived #分析以下信息，可知VIP漂移到調度A ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled) Active: active (running) since Sun 2017-07-02 10:07:36 CST; 17min ago Process: 20019 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS) Main PID: 20020 (keepalived) CGroup: /system.slice/keepalived.service ├─20020 /usr/sbin/keepalived -D ├─20021 /usr/sbin/keepalived -D └─20022 /usr/sbin/keepalived -D Jul 02 10:07:37 node1 Keepalived_vrrp[20022]: Opening script file /etc/keepalived/notify1.sh Jul 02 10:07:37 node1 Keepalived_healthcheckers[20021]: Netlink reflector reports IP 192.168.0.200 added Jul 02 10:07:42 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_1) Sending gratuitous ARPs on ens33 for 192.168.0.200 Jul 02 10:18:54 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Transition to MASTER STATE Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Entering MASTER STATE Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) setting protocol VIPs. Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Sending gratuitous ARPs on ens33 for 192.168.0.201 Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: Opening script file /etc/keepalived/notify2.sh Jul 02 10:18:55 node1 Keepalived_healthcheckers[20021]: Netlink reflector reports IP 192.168.0.201 added Jul 02 10:19:00 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Sending gratuitous ARPs on ens33 for 192.168.0.201
查看郵件
[root@node1 keepalived]# mail #node1成為VIP192.168.0.201的主節點 Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/root": 1 message > 1 root Sun Jul 2 10:18 19/702 "node1 to be master:192.168.0.201 floating" & 1 Message 1: From root@node1.localdomain Sun Jul 2 10:18:55 2017 Return-Path: <root@node1.localdomain> X-Original-To: root@localhost Delivered-To: root@localhost.localdomain Date: Sun, 02 Jul 2017 10:18:55 +0800 To: root@localhost.localdomain Subject: node1 to be master:192.168.0.201 floating User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii From: root@node1.localdomain (root) Status: RO 2017-07-02 10:18:55:vrrp2 transition,node1 changed to be master
2.模擬web服務器A故障(RS1)
webA上操作
[root@localhost ~]# systemctl stop httpd
調度器A上操作
查看郵件
[root@node1 keepalived]# mail #分析以下信息，可知RS1宕機 Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/root": 4 messages 2 new 1 root Sun Jul 2 10:18 19/702 "node1 to be master:192.168.0.201 floating" 2 root Sun Jul 2 10:28 19/702 "node1 to be backup:192.168.0.201 floating" >N 3 keepalived@localhost Sun Jul 2 10:28 17/642 "[node1] Realserver [192.168.0.3]:80 - DOWN" N 4 keepalived@localhost Sun Jul 2 10:28 17/642 "[node1] Realserver [192.168.0.3]:80 - DOWN"
客戶端請求查看
[root@localhost ~]# curl http://192.168.0.200 #只能訪問到RS2 backend server2
調度器B上操作
[root@node2 keepalived]# mail #分析以下信息，可知RS1宕機 Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/root": 4 messages 2 new 1 root Sun Jul 2 10:28 19/702 "node2 to be backup:192.168.0.200 floating" 2 root Sun Jul 2 10:28 19/702 "node2 to be master:192.168.0.201 floating" >N 3 keepalived@localhost Sun Jul 2 10:28 17/642 "[node2] Realserver [192.168.0.3]:80 - DOWN" N 4 keepalived@localhost Sun Jul 2 10:28 17/642 "[node2] Realserver [192.168.0.3]:80 - DOWN"
3.模擬web服務雙機故障
RS1和RS2停止web服務
調度器A上操作
查看郵件 #分析以下信息，可知雙機宕機
[root@node1 keepalived]# mail Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/root": 6 messages 2 new 1 root Sun Jul 2 10:18 19/702 "node1 to be master:192.168.0.201 floating" 2 root Sun Jul 2 10:28 19/702 "node1 to be backup:192.168.0.201 floating" 3 keepalived@localhost Sun Jul 2 10:28 18/653 "[node1] Realserver [192.168.0.3]:80 - DOWN" 4 keepalived@localhost Sun Jul 2 10:28 18/653 "[node1] Realserver [192.168.0.3]:80 - DOWN" >N 5 keepalived@localhost Sun Jul 2 10:36 17/642 "[node1] Realserver [192.168.0.4]:80 - DOWN" N 6 keepalived@localhost Sun Jul 2 10:36 17/642 "[node1] Realserver [192.168.0.4]:80 - DOWN"
查看keepalived狀態
[root@node1 keepalived]# systemctl status keepalived #分析以下信息，雙機宕機，啟動sorry服務器 ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled) Active: active (running) since Sun 2017-07-02 10:07:36 CST; 30min ago Process: 20019 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS) Main PID: 20020 (keepalived) CGroup: /system.slice/keepalived.service ├─20020 /usr/sbin/keepalived -D ├─20021 /usr/sbin/keepalived -D └─20022 /usr/sbin/keepalived -D Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: Removing alive servers from the pool for VS [192.168.0.200]:80 Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: Remote SMTP server [127.0.0.1]:25 connected. Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: SMTP alert successfully sent. Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Error connecting server [192.168.0.4]:80. Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Removing service [192.168.0.4]:80 from VS [192.168.0.201]:80 Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Lost quorum 1-0=1 > 0 for VS [192.168.0.201]:80 Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Adding sorry server [127.0.0.1]:80 to VS [192.168.0.201]:80 Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Removing alive servers from the pool for VS [192.168.0.201]:80 Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Remote SMTP server [127.0.0.1]:25 connected. Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: SMTP alert successfully sent.
客戶端請求
[root@localhost ~]# curl http://192.168.0.201 #請求至sorry服務器的web頁面 sorry server [root@localhost ~]# curl http://192.168.0.200 sorry server
看了以上關于實現keepalived雙主模型lvs高可用集群的實驗總結，如果大家還有什么地方需要了解的可以在億速云行業資訊里查找自己感興趣的或者找我們的專業技術工程師解答的，億速云技術工程師在行業內擁有十幾年的經驗了。
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