注意
- 不需要修改默认源
- 全程需要以root身份执行
- 目前只能在虚拟机或实体机安装，docker中暂时还有问题
安装
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| apt-cache search keepalived
keepalived - Failover and monitoring daemon for LVS clusters
apt-get install keepalived
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安装完成，会生成/etc/keepalived/目录，该目录是keepalived的配置文件目录。
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| #!/bin/sh
A=$(ps -C nginx --no-header |wc -l)
if [ "$A" -eq 0 ]
then
systemctl start nginx
sleep 2
A2=$(ps -C nginx --no-header |wc -l)
if [ "$A2" -eq 0 ]
then
killall keepalived
fi
fi
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主配置
- ifconfig 查看网卡名称和ip
- vim /etc/keepalived/keepalived.conf
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| vi /etc/keepalived/keepalived.conf
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| # 全局配置
global_defs {
notification_email {
chensz@xxx.com
}
notification_email_fromchensz@xxx.com
smtp_server 192.168.140.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
# 严格遵守vrrp协议，下面这些功能将会禁止：1. 0 VIP 2. unicast(单播) peers 3. vrrp 版本2的ipv6功能
vrrp_strict
# 小数类型，单位秒，在一个网卡上每组gratuitous arp消息之间的延迟时间，默认为0，一个发送的消息=n组 arp报文
vrrp_garp_interval 0
# 小数类型，单位秒， 在一个网卡上每组na消息之间的延迟时间，默认为0
vrrp_gna_interval 0
}
vrrp_script check_nginx_alive {
script "/usr/bin/check_nginx_alive.sh"
# 检查时间间隔
interval 2
# 脚本执行失败则优先级减10
weight -10
# 表示两次失败才算失败
fall 2
}
# 定义实例
vrrp_instance VI_1 {
state MASTER
interface ens32
# 指定VRRP实例ID，范围是0-255.同一个组要一致
virtual_router_id 51
priority 100
# 指定发送VRRP通告的间隔。单位是秒。
advert_int 1
# 指定认证方式。PASS简单密码认证(推荐),AH:IPSEC认证(不推荐)。密码" 最多8位
authentication {
auth_type PASS
auth_pass 1111
}
# 设备之间使用的虚拟ip地址
virtual_ipaddress {
192.168.140.222
}
# 执行脚本
track_script {
check_nginx_alive
}
}
virtual_server 192.168.140.222 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.140.210 80 {
weight 1
TCP_CHECK{
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
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备配置
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| vim /etc/keepalived/keepalived.conf
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|
# 全局配置
global_defs {
notification_email {
chensz@xxx.com
}
notification_email_from chensz@xxx.com
smtp_server 192.168.140.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
# 严格遵守vrrp协议，下面这些功能将会禁止：1. 0 VIP 2. unicast(单播) peers 3. vrrp 版本2的ipv6功能
vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script check_nginx_alive {
script "/usr/bin/check_nginx_alive.sh"
interval 3
weight -10
fall 2
}
# 定义实例
vrrp_instance VI_1 {
state BACKUP
interface ens160
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.140.222
}
track_script {
check_nginx_alive
}
}
virtual_server 192.168.140.222 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.140.213 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
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| systemctl enable keepalived
systemctl start keepalived
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注意
新版本
查看网卡，只会存在 主master 可以看到 虚拟vip
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| tail -500f /var/log/syslog | grep Keepalived
cat /var/log/syslog | grep Keepalived
|
