NGINX+keepalived

參考部落格: http://pmghong.blog.51cto.com/3221425/1264947/

第一步：配置NGINX負載均衡 http://www.cnblogs.com/carbon3/p/5853590.html

第二步：配置 keepalived 的高可用

二、安裝配置keepalived(node2配置參考node1，大體上一樣)

1、安裝配置keepalived

[root@node1 src]# yum -y install popt popt-devel popt-static openssl-devel kernel-devel libnl libnl-devel

[root@node1 src]# wget http://www.keepalived.org/software/keepalived-1.2.23.tar.gz

[root@node1 src]# tar -zxvf keepalived-1.2.23.tar.gz

[root@node1 src]# cd keepalived-1.2.23

[root@node1 keepalived-1.2.23]# ./configure --prefix=/usr/local/keepalived

configure: error:

!!! Please install libnfnetlink headers.

解決辦法：

yum install -y libnfnetlink-devel

安裝成功後顯示：

Keepalived configuration
------------------------
Keepalived version       : 1.2.23
Compiler                 : gcc
Compiler flags           : -g -O2 -DFALLBACK_LIBNL1
Extra Lib                : -lssl -lcrypto -lcrypt  -lnl  
Use IPVS Framework       : Yes
IPVS sync daemon support : Yes
IPVS use libnl           : Yes
fwmark socket support    : Yes
Use VRRP Framework       : Yes
Use VRRP VMAC            : Yes
Use VRRP authentication  : Yes
SNMP keepalived support  : No
SNMP checker support     : No
SNMP RFCv2 support       : No
SNMP RFCv3 support       : No
SHA1 support             : No
Use Debug flags          : No
Memory alloc check       : No
libnl version            : 1
Use IPv4 devconf         : No
Use libiptc              : No
Use libipset             : No

接着

[root@node1 keepalived-1.2.4]# make && make install

[root@node1 keepalived-1.2.4]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

[root@node1 keepalived-1.2.4]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

[root@node1 keepalived-1.2.4]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

[root@node1 keepalived-1.2.4]# mkdir -p /etc/keepalived

[root@node1 keepalived-1.2.4]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

[root@node1 keepalived-1.2.4]# chmod +x /etc/init.d/keepalived

配置

[root@node1 keepalived-1.2.4]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

[email protected]

}

notification_email_from [email protected]

smtp_server 192.168.128.128 # node2上改為192.168.128.129

smtp_connect_timeout 30

router_id LVS_DEVEL

vrrp_script chk_nginx { # 定義監控腳本

script "/etc/keepalived/checkNginx.sh"

interval 2

weight 2

vrrp_instance VI_1 {

state MASTER # node2 修改為BACKUP

interface eth0 #node2 可能是eth1 我在虛拟測試的時候就是系統是克隆過來的。

virtual_router_id 51

priority 120 # node2上的數值應低于這個值，例如100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

virtual_ipaddress {

192.168.128.120

track_script { # 執行監控腳本，這段代碼一定要加！！否則不會調用上面的腳本

chk_nginx

2、建立檢測腳本

[root@node1 keepalived-1.2.4]# vim /etc/keepalived/checkNginx.sh

#!/bin/bash

#auto check nginx process

killall -0 nginx

if [[ $? -ne 0 ]];then

/etc/init.d/keepalived stop

[root@node1 keepalived-1.2.4]# chmod +x /etc/keepalived/checkNginx.sh

3、啟動服務

[root@node1 ~]# service keepalived start

Starting keepalived: [ OK ]

[root@node2 ~]# service keepalived start

主伺服器：

[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:1c:5b:83 brd ff:ff:ff:ff:ff:ff
    inet 192.168.128.128/24 brd 192.168.128.255 scope global eth0
    inet 192.168.128.120/32 scope global eth0
    inet6 fe80::20c:29ff:fe1c:5b83/64 scope link 
       valid_lft forever preferred_lft forever

從伺服器

[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:b1:0a:0b brd ff:ff:ff:ff:ff:ff
    inet 192.168.128.129/24 brd 192.168.128.255 scope global eth1
    inet6 fe80::20c:29ff:feb1:a0b/64 scope link 
       valid_lft forever preferred_lft forever

當主伺服器挂了的話，從伺服器就會接管VIP 用ip addr 檢視的時候就會出現 192.168.128.120 。當主伺服器恢複的時候 VIP雙會被主伺服器接管。

擴充閱讀：http://zkchang.blog.51cto.com/10574636/1706998

keepalived的主從和雙主模式

雙主的話需要在域名供應商裡給那個域名設定兩個IP 這樣可以輪詢。這樣 keepalived的兩個VIP就起做用了。

http://www.cnblogs.com/holbrook/archive/2012/10/25/2738475.html