：高性能Web宏观架构之代理服务器Keepalived安装部署

Posted 2022-12-03 S1ow

接上一章，搞下Keepalived的东东，那么它到底是干嘛的呢？
以下是引自百度简介：

Keepalived的作用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当web服务器工作正常后Keepalived自动将web服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的web服务器。

用Keepalived的主要作用其实上面说的那些基本上不会出现，现在的硬件较为发达，所以很少会出现服务器挂掉的时候，主要还是对外提供一个稳定的虚拟ip，用于对外访问使用。

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不废话，Come On！
前提交代：
1、假设，所有的安装包默认被拷贝到 /tmp/ 目录下；
2、至少两台（虚拟）主机，每台虚拟机需要1个静态IP地址，还需要至少1个IP地址作为VIP（虚IP），即最少需要3个静态IP地址。

安装步骤：
1、安装Keepalived：

cd /tmp
tar -zxvf keepalived-1.2.12.tar.gz -C /usr/src/
#等待解压完毕…
cd /usr/src/keepalived-1.2.12/
./configure 
#等待配置完毕…
make && make install

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配置步骤：
1、文件目录的调整：

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/

2、设置开机启动：

chkconfig --add keepalived
chkconfig keepalived on

3、Keepalived Master配置文件：

! Configuration File for keepalived

global_defs 
   notification_email 
     [e-mail]
   
   #邮箱配置
   notification_email_from [e-mail]
   smtp_server stmp.163.com
   smtp_connect_timeout 30
   router_id ACLOME_DEV


vrrp_script chk_nginx   
    script "killall -0 nginx" 
    interval 1  
    weight -2   
    fall 2      
    rise 1     
  

vrrp_instance VI_1 
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication 
        auth_type PASS
        auth_pass 1111
    
    #虚拟ip
    virtual_ipaddress 
        192.168.1.100
    
    track_script   
        chk_nginx  
     

4、Keepalived Backup配置文件：

! Configuration File for keepalived

global_defs 
   notification_email 
     [e-mail]
   
   #邮箱配置
   notification_email_from [e-mail]
   smtp_server stmp.163.com
   smtp_connect_timeout 30
   router_id ACLOME_DEV


vrrp_script chk_nginx   
    script "killall -0 nginx" 
    interval 1  
    weight -2   
    fall 2      
    rise 1     
  

vrrp_instance VI_1 
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication 
        auth_type PASS
        auth_pass 1111
    
    #虚拟ip
    virtual_ipaddress 
        192.168.1.100
    
    track_script   
        chk_nginx  
     

5、配置防火墙：

service iptables stop
chkconfig iptables off

6、启动Keepalived：

service keepalived start

7、执行ip addr命令可以查看虚拟IP地址已经被配置到网卡

[root@lb1 /]# 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 f2:2f:03:a1:5d:81 brd ff:ff:ff:ff:ff:ff
    inet 10.4.55.6/26 brd 10.4.55.63 scope global eth0
    inet 10.4.55.23/32 scope global eth0
    inet6 fe80::f02f:3ff:fea1:5d81/64 scope link
       valid_lft forever preferred_lft forever

至此就完成了Keepalived的安装配置，相对来说比较简单。