14.5. keepalived¶
14.5.1. 准备工作¶
主要是selinux 、firewalld和时间同步问题，这些这里就不写了。
14.5.2. 安装配置ip漂移¶
# 备份原有的
[root@centos-151 ~]# yum install keepalived
[root@centos-151 ~]# cd /etc/keepalived/
[root@centos-151 keepalived]# ls
keepalived.conf
[root@centos-151 keepalived]# cp keepalived.conf{,.bak}
[root@centos-151 keepalived]# ll
total 8
-rw-r--r-- 1 root root 3598 Mar 20 09:38 keepalived.conf
-rw-r--r-- 1 root root 3598 Mar 20 09:41 keepalived.conf.bak
# 修改配置
[root@centos-151 keepalived]# vim keepalived.conf
[root@centos-151 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 30
router_id LVS_DEVEL
vrrp_mcast_group4 224.1.1.1
}
vrrp_instance VI_1 {
state MASTER
interface ens37
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.46.100/16
}
}
# 复制到远程主机并修改
[root@centos-151 keepalived]# cp keepalived.conf 192.168.46.154:/etc/keepalived/
cp: cannot create regular file ‘192.168.46.154:/etc/keepalived/’: No such file or directory
[root@centos-151 keepalived]# scp keepalived.conf 192.168.46.154:/etc/keepalived/
The authenticity of host '192.168.46.154 (192.168.46.154)' can't be established.
ECDSA key fingerprint is SHA256:CCHUJxa/IGrB0CXKtvPHaiVK+pJAp3xY0djGwCkmQVM.
ECDSA key fingerprint is MD5:54:dd:11:2f:d4:8d:31:18:39:15:5a:ec:9a:9a:43:da.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.46.154' (ECDSA) to the list of known hosts.
root@192.168.46.154's password:
keepalived.conf
[root@centos-154 ~]# cat /etc/keepalived/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 30
router_id LVS_DEVEL_2
vrrp_mcast_group4 224.1.1.1
}
vrrp_instance VI_1 {
state BACKUP
interface ens37
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.46.100/16
}
}
# 启动服务并抓包
# 启动151
[root@centos-151 keepalived]# systemctl restart keepalived
[root@centos-154 keepalived]# systemctl restart keepalived
# 抓包
[root@centos-151 ~]# tcpdump -i ens37 -nn host 224.1.1.1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens37, link-type EN10MB (Ethernet), capture size 262144 bytes
09:56:45.609383 IP 172.18.46.151 > 224.1.1.1: igmp v2 report 224.1.1.1
09:56:46.609380 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:47.613899 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:48.508630 IP 172.18.46.151 > 224.1.1.1: igmp v2 report 224.1.1.1
09:56:48.615603 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:49.617331 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:50.619132 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:51.620877 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:52.621399 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:53.398894 IP 172.18.105.131 > 224.1.1.1: igmp v2 report 224.1.1.1
09:56:53.623045 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:54.624785 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:54.902075 IP 172.18.105.131 > 224.1.1.1: igmp v2 report 224.1.1.1
09:56:55.626201 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:56.628140 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:57.630579 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:58.632492 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:56:59.633962 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:00.636156 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:01.637809 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:02.397616 IP 172.18.105.131 > 224.1.1.1: igmp v2 report 224.1.1.1
09:57:02.639238 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:03.640875 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:04.642235 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:05.643316 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:06.645263 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:57:07.647454 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
# 关闭151
[root@centos-151 keepalived]# systemctl stop keepalived
# 抓包，可以看到主动关闭151发送0优先级， 154机器的优先级是80，就占有ip了。
[root@centos-151 ~]# tcpdump -i ens37 -nn host 224.1.1.1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens37, link-type EN10MB (Ethernet), capture size 262144 bytes
09:59:34.884048 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:35.885537 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:36.887106 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:37.888805 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:38.890461 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:39.892321 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:40.893758 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:41.895278 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
09:59:42.195050 IP 172.18.46.151 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 0, authtype simple, intvl 1s, length 20
09:59:42.884235 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
09:59:43.886181 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
09:59:44.887932 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
09:59:45.889441 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
09:59:46.891284 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
09:59:47.892750 IP 172.18.105.131 > 224.1.1.1: VRRPv2, Advertisement, vrid 51, prio 80, authtype simple, intvl 1s, length 20
14.5.3. 启动日志功能¶
# 修改日志设置
[root@centos-154 ~]# vim /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -S 3"
# 配置特定local
[root@centos-154 ~]# vim /etc/rsyslog.conf
# 添加一行
local3.* /var/log/keepalived.log
# 重启服务
[root@centos-154 ~]# systemctl keepalived
[root@centos-154 ~]# systemctl restart keepalived
# 查看日志信息
[root@centos-154 ~]# cat /var/log/keepalived.log
Mar 20 10:06:05 centos-154 Keepalived[3097]: Starting Keepalived v1.3.5 (03/19,2017), git commit v1.3.5-6-g6fa32f2
Mar 20 10:06:05 centos-154 Keepalived[3097]: Unable to resolve default script username 'keepalived_script' - ignoring
Mar 20 10:06:05 centos-154 Keepalived[3097]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 20 10:06:05 centos-154 Keepalived[3098]: Starting Healthcheck child process, pid=3099
Mar 20 10:06:05 centos-154 Keepalived[3098]: Starting VRRP child process, pid=3100
Mar 20 10:06:05 centos-154 Keepalived_healthcheckers[3099]: Initializing ipvs
Mar 20 10:06:05 centos-154 Keepalived_healthcheckers[3099]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: Registering Kernel netlink reflector
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: Registering Kernel netlink command channel
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: Registering gratuitous ARP shared channel
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) removing protocol VIPs.
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: Using LinkWatch kernel netlink reflector...
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) Entering BACKUP STATE
Mar 20 10:06:05 centos-154 Keepalived_vrrp[3100]: VRRP sockpool: [ifindex(3), proto(112), unicast(0), fd(10,11)]
Mar 20 10:06:09 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) Transition to MASTER STATE
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) Entering MASTER STATE
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) setting protocol VIPs.
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens37 for 172.18.46.100
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:10 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
Mar 20 10:06:15 centos-154 Keepalived_vrrp[3100]: Sending gratuitous ARP on ens37 for 172.18.46.100
# 查看vip是不是回到151机器上面来了。
[root@centos-154 ~]# ip a show ens37
14.5.4. 状态切换脚本通知¶
# 准备脚本
[root@centos-151 ~]# cd /root/
[root@centos-151 ~]# vim notify.sh
[root@centos-151 ~]# cat notify.sh
#!/bin/bash
contact='root@localhost'
notify() {
mailsubject="$(hostname) to be $1, vip floating"
mailbody="$(date +'%F %T'): vrrp 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
# 添加权限
[root@centos-154 ~]# chmod 755 notify.sh
# 测试脚本
[root@centos-151 ~]# /root/notify.sh master
[root@centos-151 ~]# mail
Heirloom Mail version 12.5 7/5/10. Type ? for help.
"/var/spool/mail/root": 1 message 1 new
>N 1 root Tue Mar 20 10:43 22/1043 "centos-151.linuxpanda.tech to be master, vip floating"
& quit
# 添加通知
[root@centos-154 ~]# vim /etc/keepalived/keepalived.conf
[root@centos-151 ~]# vim /etc/keepalived/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 30
router_id LVS_DEVEL_2
vrrp_mcast_group4 224.1.1.1
}
vrrp_instance VI_1 {
state BACKUP
interface ens37
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.46.100/16
}
notify_master "/root/notify.sh master"
notify_backup "/root/notify.sh backup"
notify_fault "/root/notify.sh fault"
}
# 删除邮件，危险
[root@centos-151 ~]# rm -rf /var/spool/mail/root
# 重启151的keepalived服务，发现收到邮件通知。
[root@centos-151 ~]# mail
Heirloom Mail version 12.5 7/5/10. Type ? for help.
"/var/spool/mail/root": 1 message 1 new
>N 1 root Tue Mar 20 10:54 22/1043 "centos-151.linuxpanda.tech to be master, vip floating"
& q
Held 1 message in /var/spool/mail/root
[root@centos-151 ~]# amil
bash: amil: command not found
[root@centos-151 ~]# mail
Heirloom Mail version 12.5 7/5/10. Type ? for help.
"/var/spool/mail/root": 1 message 1 unread
>U 1 root Tue Mar 20 10:54 23/1053 "centos-151.linuxpanda.tech to be master, vip floating"
& 1
Message 1:
From root@centos-151.linuxpanda.tech Tue Mar 20 10:54:14 2018
Return-Path: <root@centos-151.linuxpanda.tech>
X-Original-To: root@centos-151.linuxpanda.tech
Delivered-To: root@centos-151.linuxpanda.tech
From: root <root@centos-151.linuxpanda.tech>
Date: Tue, 20 Mar 2018 10:54:08 +0800
To: root@centos-151.linuxpanda.tech
Subject: centos-151.linuxpanda.tech to be master, vip floating
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
Status: RO
2018-03-20 10:54:08: vrrp transition, centos-151.linuxpanda.tech changed to be master
14.5.5. lvs+keepalived配合使用¶
14.5.5.1. 拓扑图¶
14.5.5.2. 配置2个lvs¶
# 151机器的
[root@centos-151 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 30
router_id LVS_DEVEL_1
vrrp_mcast_group4 224.1.1.1
}
vrrp_instance VI_1 {
state MASTER
interface ens37
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.46.100/16
}
notify_master "/root/notify.sh master"
notify_backup "/root/notify.sh backup"
notify_fault "/root/notify.sh fault"
}
virtual_server 172.18.46.100 80{
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.46.152 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.46.153 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
# 154机器的
[root@centos-154 ~]# cat /etc/keepalived/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 30
router_id LVS_DEVEL_2
vrrp_mcast_group4 224.1.1.1
}
vrrp_instance VI_1 {
state BACKUP
interface ens37
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.46.100/16
}
notify_master "/root/notify.sh master"
notify_backup "/root/notify.sh backup"
notify_fault "/root/notify.sh fault"
}
virtual_server 172.18.46.100 80{
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.46.152 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.46.153 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
# 安装ipvsadm
[root@centos-151 keepalived]# yum install ipvsadm
[root@centos-154 keepalived]# yum install ipvsadm
# 重启keepalived
[root@centos-151 keepalived]# systemctl restart keepalived
[root@centos-154 keepalived]# systemctl restart keepalived
# 查看keepalived自动生成的规则
[root@centos-151 keepalived]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.18.46.100:80 rr persistent 50
-> 192.168.46.152:80 Masq 1 0 0
-> 192.168.46.153:80 Masq 1 0 0
14.5.5.3. 配置2个RS¶
# 在152上执行脚本
[root@centos-152 ~]# rz
[root@centos-152 ~]# ls
anaconda-ks.cfg lvs_dr_rs.sh
[root@centos-152 ~]# vim lvs_dr_rs.sh
[root@centos-152 ~]# chmod a+x lvs_dr_rs.sh
[root@centos-152 ~]# bash lvs_dr_rs.sh start
The RS Server is Ready!
[root@centos-152 ~]# cat lvs_dr_rs.sh
#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=172.18.46.100
mask='255.255.255.255'
dev=lo:1
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 $dev $vip netmask $mask #broadcast $vip up
#route add -host $vip dev $dev
echo "The RS Server is Ready!"
;;
stop)
ifconfig $dev 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 "The RS Server is Canceled!"
;;
*)
echo "Usage: $(basename $0) start|stop"
exit 1
;;
esac
# 在153上也执行下
[root@centos-152 ~]# scp lvs_dr_rs.sh 192.168.46.153:/root
The authenticity of host '192.168.46.153 (192.168.46.153)' can't be established.
ECDSA key fingerprint is SHA256:CCHUJxa/IGrB0CXKtvPHaiVK+pJAp3xY0djGwCkmQVM.
ECDSA key fingerprint is MD5:54:dd:11:2f:d4:8d:31:18:39:15:5a:ec:9a:9a:43:da.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.46.153' (ECDSA) to the list of known hosts.
root@192.168.46.153's password:
lvs_dr_rs.sh
[root@centos-153 ~]# bash lvs_dr_rs.sh start
The RS Server is Ready!
# 配置nginx服务
[root@centos-152 ~]# yum install nginx
[root@centos-153 ~]# yum install nginx
[root@centos-152 ~]# systemctl restart nginx
[root@centos-153 ~]# systemctl restart nginx
[root@centos-152 ~]# echo "rs152" > /usr/share/nginx/html/index.html
[root@centos-153 ~]# echo "rs153" > /usr/share/nginx/html/index.html
[root@centos-151 keepalived]# curl 192.168.46.152
rs152
[root@centos-151 keepalived]# curl 192.168.46.153
rs153
14.5.5.4. 测试¶
[root@localhost ~]# for i in {1..100} ; do sleep 2 ; curl 10.0.46.100; done
rs152
rs153
rs152
rs153
rs152
rs153
rs152
rs153
rs152
rs153
rs152
rs153
rs152
rs153
rs152
rs153
rs152
^C
# 停掉151的keepalived服务
[root@localhost ~]# for i in {1..100} ; do sleep 1 ; curl 10.0.46.100; done
rs152
rs153
rs152
rs153
rs152
rs153
^C
# 继续停掉152的nginx服务，
[root@localhost ~]# for i in {1..10} ; do sleep 1 ; curl 10.0.46.100; done
rs153
curl: (7) Failed connect to 10.0.46.100:80; Connection refused
rs153
curl: (7) Failed connect to 10.0.46.100:80; Connection refused
rs153
curl: (7) Failed connect to 10.0.46.100:80; Connection refused
rs153
rs153
rs153
rs153
# 继续停掉153的nginx服务后测试
[root@localhost ~]# for i in {1..10} ; do sleep 1 ; curl 10.0.46.100; done
sorry page
sorry page
sorry page
sorry page
sorry page
sorry page
sorry page
sorry page
sorry page
sorry page
上面的测试，出现连接拒绝问题，是因为我们停掉了nginx服务，keepalived没有及时发现， 需要3次确认才下线。