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Keepalived ???????????

Keepalived ??

Keepalived ?????????????????????????????????????? Nginx?Haproxy ?????????????Keepalived ???? web ????????????????? VRRP??????????????????????????????????? IP????????????

???????

1. ????

[root@localhost ~]# yum install -y openssl openssl-devel

2. ????

[root@localhost ~]# wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz
[root@localhost ~]# tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
[root@localhost ~]# cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/
[root@localhost ~]# make && make install

3. ??

3.1 ?????

[root@localhost ~]# mkdir /etc/keepalived
[root@localhost ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@localhost ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@localhost ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@localhost ~]# ln -s /usr/local/sbin/keepalived /usr/sbin/
[root@localhost ~]# rm /sbin/keepalived
[root@localhost ~]# ln -s /usr/local/keepalived/sbin/keepalived /sbin/

3.2 ??????

[root@localhost ~]# chkconfig keepalived on

3.3 ????

?? keepalived.conf ?????

[root@localhost ~]# vi /etc/keepalived/keepalived.conf

79 ???Master???

vrrp_script chk_haproxy {
    script "/etc/keepalived/haproxy_check.sh"
    interval 2
    weight -20
}
vrrp_instance VI_1 {
    state MASTER
    interface eno16777736
    virtual_router_id 74
    mcast_src_ip 192.168.11.74
    priority 100
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass bhz
    }
    track_script {
        chk_haproxy
    }
    virtual_ipaddress {
        192.168.11.70
    }
}

80 ???backup???

vrrp_script chk_haproxy {
    script "/etc/keepalived/haproxy_check.sh"
    interval 2
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP
    interface eno16777736
    virtual_router_id 74
    mcast_src_ip 192.168.11.75
    priority 90
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass bhz
    }
    track_script {
        chk_haproxy
    }
    virtual_ipaddress {
        192.168.1.70
    }
}

?????

1. ????

#!/bin/bash
COUNT=`ps -C haproxy --no-header |wc -l`
if [ $COUNT -eq 0 ]; then
    /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
    sleep 2
    if [ `ps -C haproxy --no-header |wc -l` -eq 0 ]; then
        killall keepalived
    fi
fi

2. ??

[root@localhost ~]# chmod +x /etc/keepalived/haproxy_check.sh

?????

1. ?? keepalived

[root@localhost ~]# service keepalived start | stop | status | restart

2. ?? Haproxy

[root@localhost ~]# /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg

3. ??????

[root@localhost ~]# service keepalived start

4. ??????

[root@localhost ~]# ps -ef | grep haproxy
[root@localhost ~]# ps -ef | grep keepalived

?????

• 27 ????????? 27 ??? keepalived ???
• 28 ??????? 28 ???????? VIP ??? 28 ????????? Haproxy ? Keepalived ???????

????

• ??? Keepalived ?????????????????????????
• ???? Haproxy ????? web ????????

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