安裝HAProxy請參考
https://blog.csdn.net/qq_37174887/article/details/106998621
安裝Keepalived
1、下載安裝依賴包
yum install -y wget make gcc openssl-devel popt-devel
2、下載、安裝Keepalived
wget http://www.keepalived.org/software/keepalived-1.2.8.tar.gz
tar zxvf keepalived-1.2.8.tar.gz
cd keepalived-1.2.8
./configure --prefix=/usr/local/keepalived
make
make install
3、安裝成功後做成服務模式。
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
4、配置文件
mkdir -p /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
chmod +x /etc/init.d/keepalived
vi /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_DEVEL
}
#監測haproxy進程狀態,每2秒執行一次
vrrp_script chk_haproxy {
script "/etc/keepalived/chk_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER #從服務器爲BACKUP
interface eth0
virtual_router_id 51
priority 100 #從服務器要低於100
advert_int 1
mcast_src_ip 10.10.3.171 #MASTER服務器IP,從服務器寫從服務器的IP
authentication {
auth_type PASS
auth_pass 111111
}
track_script {
chk_haproxy #監測haproxy進程狀態
}
virtual_ipaddress {
10.10.3.170 #虛擬IP
}
}
chk_haproxy.sh內容
vi /etc/keepalived/chk_haproxy.sh
status=$(ps aux|grep haproxy | grep -v grep | grep -v bash | wc -l)
if [ "${status}" = "0" ]; then
/etc/init.d/haproxy start
status2=$(ps aux|grep haproxy | grep -v grep | grep -v bash |wc -l)
if [ "${status2}" = "0" ]; then
/etc/init.d/keepalived stop
fi
fi
啓動和關閉服務
service keepalived start
service keepalived stop
高可用測試
1、將Master上的keepalived停止
查看Master上的日誌
tail -f /var/log/messages
Sep 23 01:24:34 181 Keepalived[3125]: Stopping Keepalived v1.2.8 (09/23,2013)
Sep 23 01:24:34 181 Keepalived_vrrp[3127]: VRRP_Instance(VI_1) sending 0 priority
Sep 23 01:24:34 181 Keepalived_vrrp[3127]: VRRP_Instance(VI_1) removing protocol VIPs.
發現Master釋放了VIP
再查看Backup上的日誌
Sep 23 01:20:26 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Transition to MASTER STATE
Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Entering MASTER STATE
Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) setting protocol VIPs.
Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180
Sep 23 01:20:27 182 Keepalived_healthcheckers[2886]: Netlink reflector reports IP 10.10.3.180 added
發現Backup綁定了VIP
2、將Master上的keepalived啓動
查看Master上的日誌
tail -f /var/log/messages
Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) Entering MASTER STATE
Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) setting protocol VIPs.
Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180
Sep 23 01:27:56 181 Keepalived_healthcheckers[3449]: Netlink reflector reports IP 10.10.3.180 added
發現Master綁定了VIP
再查看Backup上的日誌
Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Received higher prio advert
Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Entering BACKUP STATE
Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) removing protocol VIPs.
Sep 23 01:21:15 182 Keepalived_healthcheckers[2886]: Netlink reflector reports IP 10.10.3.180 removed
發現Backup釋放了VIP