注: LVS + Keepalived 不知道為什麼出現一個很鬱悶的問題.......
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原來的拓撲是:
LVS 主 + WEB1
LVS 從 + WEB2
IP 是3個外網IP WEB1 123.123.123.121 WEB2 123.123.123.122
VIP 123.123.123.123
直接訪問 WEB1 123.123.123.121 正常
直接訪問 WEB2 123.123.123.122 正常
訪問VIP 不行 VIP 可以ping通····
關閉 WEB1 服務 VIP 可以了.... 鬱悶....是否VIP 80 與 WEB1 80埠衝突？
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轉入正題.......
拓撲
WEB1 + Keepalived 主 IP 123.123.123.121
WEB2 + Keepalived 從 IP 123.123.123.122
VIP 123.123.123.123
兩臺機都安裝 Keepalived
下載 wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
tar zxvf keepalived-1.2.1.tar.gz
cd keepalived-1.2.1
./configure
make
make install
將keepalived做成啟動腳務:
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
【service keepalived start 可啟動，這裡暫時不啟動，等修改完配置檔案以後再啟動】
Keealived的配置檔案修改..
vi /etc/keepalived/keepalived.conf
【主 的Keepalived 的配置檔案設定】
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vrrp_script chk_http_port {
script "/opt/local/nginx/nginx_pid.sh" 監控指令碼
interval 2 監控時間
weight 2
}
vrrp_instance VI_1 {
state MASTER 主
interface eth0 監控網路卡
virtual_router_id 51 這個兩臺伺服器必須一樣
priority 101 權重值 高於 從
authentication {
auth_type PASS 加密
auth_pass 1111 與從想同
}
track_script {
chk_http_port 執行監控的服務
}
virtual_ipaddress {
123.123.123.123 VIP
}
}
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【從 的Keepalived 的配置檔案設定】
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vrrp_script chk_http_port {
script "/opt/local/nginx/nginx_pid.sh" 監控指令碼
interval 2 監控時間
weight 2
}
vrrp_instance VI_1 {
state BACKUP 從
interface eth0 監控網路卡
virtual_router_id 51 這個兩臺伺服器必須一樣
priority 100 權重值 低於 主
authentication {
auth_type PASS 加密
auth_pass 1111 與從想同
}
track_script {
chk_http_port 執行監控的服務
}
virtual_ipaddress {
123.123.123.123 VIP
}
}
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【編寫Nginx 的監控指令碼】
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#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
/opt/local/nginx/sbin/nginx
sleep 3
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
killall keepalived
fi
fi
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WEB1 WEB2 分別啟動...Nginx 與 Keepalived 測試一下...
# ip add list 檢視 eth0 是否繫結 vip
關閉 主 Keepalived 檢視是否 從 會 接管 VIP