Keepalived 配置示例
满足基本 HA 功能的配置
global_defs {
notification_email {
root@localhost
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
script_user root
}
vrrp_script chk_haproxy {
script “killall -0 haproxy”
interval 1
weight -2
}
vrrp_instance VI_1 {
state MASTER #备节点改成BACKUP
interface ens33
virtual_router_id 51
priority 101 #倍节点改成100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.75
}
track_script {
chk_haproxy
}
notify_master "/etc/keepalived/notify master" root
notify_backup "/etc/keepalived/notify backup" root
notify_fault "/etc/keepalived/notify fault" root
}
include /etc/keepalived/include/*
基本 LVS 的配置
virtual_server 192.168.0.63 80 {
delay_loop 6
lvs_sched rr
lvs_method DR
protocol TCP
real_server 192.168.1.71 80 {
TCP_CHECK {
connect_timeout 10
}
}
real_server 192.168.0.72 80 {
TCP_CHECK {
connect_timout 10
}
}
}
keepalive 双主模型
global_defs {
notification_email {
linuxedu@foxmail.com
}
notification_email_from kanotify@magedu.com
smtp_connect_timeout 3
smtp_server 127.0.0.1
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 1
weight -2
}
vrrp_instance VI_1 {
interface eth0
state MASTER # BACKUP for slave routers
priority 101 # 100 for BACKUP
virtual_router_id 51
garp_master_delay 1
authentication {
auth_type PASS
auth_pass password
}
track_interface {
eth0
}
virtual_ipaddress {
192.168.0.75
}
track_script {
chk_haproxy
}
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 {
interface eth0
state BACKUP # BACKUP for slave routers
priority 100 # 100 for BACKUP
virtual_router_id 52
garp_master_delay 1
authentication {
auth_type PASS
auth_pass password
}
track_interface {
eth0
}
virtual_ipaddress {
192.168.0.75
}
track_script {
chk_haproxy
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
keepalived 所用到的脚本示例
下面是一个 notify.sh 脚本的简单示例：
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
vip=192.168.0.75
contact='root@localhost'
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mail -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
systemctl start haproxy.service
exit 0
;;
backup)
notify backup
systemctl stop haproxy.service
exit 0
;;
fault)
notify fault
/etc/rc.d/init.d/haproxy stop
exit 0
;;
*)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
;;
esac
keepalived 通知脚本进阶示例：
下面的脚本可以接受选项，其中：
-s, –service SERVICE,…：指定服务脚本名称，当状态切换时可自动启动、重启或关闭此服务；
-a, –address VIP: 指定相关虚拟路由器的 VIP 地址；
-m, –mode {mm|mb}：指定虚拟路由的模型，mm 表示主主，mb 表示主备；它们表示相对于同一种服务而方，其 VIP 的工作类型；
-n, –notify {master|backup|fault}：指定通知的类型，即 vrrp 角色切换的目标角色；
-h, –help：获取脚本的使用帮助；
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
# Usage: notify.sh -m|--mode {mm|mb} -s|--service SERVICE1,... -a|--address VIP -n|--notify {master|backup|falut} -h|--help
#contact='linuxedu@foxmail.com'
helpflag=0
serviceflag=0
modeflag=0
addressflag=0
notifyflag=0
contact='root@localhost'
Usage() {
echo "Usage: notify.sh [-m|--mode {mm|mb}] [-s|--service SERVICE1,...] <-a|--address VIP> <-n|--notify {master|backup|falut}>"
echo "Usage: notify.sh -h|--help"
}
ParseOptions() {
local I=1;
if [ $# -gt 0 ]; then
while [ $I -le $# ]; do
case $1 in
-s|--service)
[ $# -lt 2 ] && return 3
serviceflag=1
services=(`echo $2|awk -F"," '{for(i=1;i<=NF;i++) print $i}'`)
shift 2 ;;
-h|--help)
helpflag=1
return 0
shift
;;
-a|--address)
[ $# -lt 2 ] && return 3
addressflag=1
vip=$2
shift 2
;;
-m|--mode)
[ $# -lt 2 ] && return 3
mode=$2
shift 2
;;
-n|--notify)
[ $# -lt 2 ] && return 3
notifyflag=1
notify=$2
shift 2
;;
*)
echo "Wrong options..."
Usage
return 7
;;
esac
done
return 0
fi
}
#workspace=$(dirname $0)
RestartService() {
if [ ${#@} -gt 0 ]; then
for I in $@; do
if [ -x /etc/rc.d/init.d/$I ]; then
/etc/rc.d/init.d/$I restart
else
echo "$I is not a valid service..."
fi
done
fi
}
StopService() {
if [ ${#@} -gt 0 ]; then
for I in $@; do
if [ -x /etc/rc.d/init.d/$I ]; then
/etc/rc.d/init.d/$I stop
else
echo "$I is not a valid service..."
fi
done
fi
}
Notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date '+%F %H:%M:%S'`, vrrp transition, `hostname` changed to be $1."
echo $mailbody | mail -s "$mailsubject" $contact
}
# Main Function
ParseOptions $@
[ $? -ne 0 ] && Usage && exit 5
[ $helpflag -eq 1 ] && Usage && exit 0
if [ $addressflag -ne 1 -o $notifyflag -ne 1 ]; then
Usage
exit 2
fi
mode=${mode:-mb}
case $notify in
'master')
if [ $serviceflag -eq 1 ]; then
RestartService ${services[*]}
fi
Notify master
;;
'backup')
if [ $serviceflag -eq 1 ]; then
if [ "$mode" == 'mb' ]; then
StopService ${services[*]}
else
RestartService ${services[*]}
fi
fi
Notify backup
;;
'fault')
Notify fault
;;
*)
Usage
exit 4
;;
esac
在 keepalived.conf 配置文件中，其调用方法如下所示：
notify_master "/etc/keepalived/notify.sh -n master -a 172.16.100.1"
notify_backup "/etc/keepalived/notify.sh -n backup -a 172.16.100.1"
notify_fault "/etc/keepalived/notify.sh -n fault -a 172.16.100.1"
keepalived 日志配置
建议使用 local2 级别日志，因为 keepalived_healthcheckers 默认为 local2 级别，新版 keepalived 已不用改该配置
修改启动参数,将 -D 改为 -D -d -S 0
sed -i 's/\(KEEPALIVED_OPTIONS=\)"-D"/\1"-D -d -S 0"/' /etc/sysconfig/keepalived
修改 rsyslog 配置
cat > /etc/rsyslog.d/keepalived-log.conf << EOF
local0.* /var/log/keepalived/keepalived.log
& stop
EOF
配置日志轮替
cat > /etc/logrotate.d/keepalived << \EOF
/var/log/keepalived/keepalived.log {
daily
copytruncate
rotate 10
missingok
dateext
notifempty
compress
sharedscripts
postrotate
/bin/kill -HUP `cat /var/run/syslogd.pid 2> /dev/null` 2> /dev/null || true
/bin/kill -HUP `cat /var/run/rsyslogd.pid 2> /dev/null` 2> /dev/null || true
endscript
}
EOF
systemctl restart rsyslog
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