Keepalived單實例簡單環境搭建

使用兩臺虛擬機簡單搭建一個 keepalived 的單實例環境

環境介紹：主機名 IP地址

keepalived-01  192.168.240.137

keepalived-02  192.168.240.139

內核版本（兩臺主機系統相同）

[root@keepalived-01 ~]# uname -r

2.6.32-573.el6.x86_64

[root@keepalived-01 ~]# cat /etc/redhat-release

CentOS release 6.7 (Final)

########################keepalived-01上的操做###########################

建立軟鏈接

[root@keepalived-01 ~]# ln -s /usr/src/kernels/2.6.32-573.el6.x86_64/ /usr/src/linux

[root@keepalived-01 ~]# ll /usr/src/

total 8

drwxr-xr-x. 2 root root 4096 Sep 23  2011 debug

drwxr-xr-x. 3 root root 4096 May 23 17:59 kernels

lrwxrwxrwx  1 root root   39 Jun 22 20:40 linux -> /usr/src/kernels/2.6.32-573.el6.x86_64/

安裝依賴軟件

[root@keepalived-01 ~]# yum -y install openssl* libnl* popt*

安裝 ip_vs 軟件

[root@keepalived-01 ~]# pwd

/root

[root@keepalived-01 ~]# ls

anaconda-ks.cfg  install.log.syslog  keepalived-1.1.19.tar.gz install.log ipvsadm-1.26.tar.gz

[root@keepalived-01 ~]# tar zxf ipvsadm-1.26.tar.gz

[root@keepalived-01 ~]# cd ipvsadm-1.26

[root@keepalived-01 ipvsadm-1.26]# make && make install

安裝完成後須要在執行一遍命令才能生效

[root@keepalived-01 ipvsadm-1.26]# /sbin/ipvsadm

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

安裝完成後要使用 lsmod 命令查看 ip_vs 是否存在

[root@keepalived-01 ~]# lsmod | grep ip_vs

ip_vs                 126534  0

libcrc32c               1246  1 ip_vs

ipv6                  335589  270 ip_vs,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6

編譯安裝 keepalived 軟件

[root@keepalived-01 ~]# tar zxf keepalived-1.1.19.tar.gz

[root@keepalived-01 ~]# cd keepalived-1.1.19

[root@keepalived-01 keepalived-1.1.19]# ./configure

[root@keepalived-01 keepalived-1.1.19]# make && make install

拷貝文件，用於 /etc/init.d/ 啓動

/bin/cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

/bin/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived -p

/bin/cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

/bin/cp /usr/local/sbin/keepalived /usr/sbin/

啓動 keepalived 服務

/etc/init.d/keepalived start

檢查 keepalived 服務

ps -ef | grep keep

root      34234      1  0 06:49 ?        00:00:00 keepalived -D

root      34236  34234  0 06:49 ?        00:00:00 keepalived -D

root      34237  34234  0 06:49 ?        00:00:00 keepalived -D

root      34243  28089  0 06:50 pts/1    00:00:00 grep keep

服務啓動成功後，須要中止服務

/etc/init.d/keepalived stop

keepalived 的配置文件是在 /etc/keepalived/ 目錄下的 keepalived.conf 文件

cd /etc/keepalived/

先將源文件備份

mv keepalived.conf keepalived.conf.ori

配置文件

vim keepalived.conf

#!/bin/bash

! Configure File for keepadlived   #註釋

global_defs {

router_id LVS_1

}

vrrp_instance VI_1 {

state MASTER         #狀態

   interface eth0       #端口

   virtual_router_id 55    #虛擬路由id，在兩個keeplived之間必須同樣

priority 150         #優先級

   advert_int 1         #接管的間隔，超過1秒接管

   authentication {      #受權

       auth_type PASS    

       auth_pass 1111

   }

   virtual_ipaddress {

       192.168.240.10/24   #vip地址

   }

}

########################keepalived-01操做結束###########################

########################keepalived-02上的操做###########################

在 keepalived-02 上的操做和 01相同，可是要注意配置文件 keepalived.conf 文件

實驗中的 keepalived-02 的配置文件以下

#!/bin/bash

! Configure File for keepadlived  

global_defs {

router_id LVS_2

}

vrrp_instance VI_1 {

state BACKUP

   interface eth0      

   virtual_router_id 55   

priority 100

   advert_int 1       

   authentication {     

       auth_type PASS    

       auth_pass 1111

   }

   virtual_ipaddress {

       192.168.240.10/24  

   }

}

########################keepalived-02操做結束###########################

以上標黃的都是兩個配置文件絕對不能同樣的地方

兩臺服務器的優先級有 priority 爲主，此次實驗的兩臺機器 keepalived-01 priority 值爲 150，keepalived-02 priority 值爲 100

（官方文檔介紹最好兩臺相差 50）

因此主爲 keepalived-01

兩臺機器分別重啓 keepalived 服務

[root@keepalived-01 ~]# /etc/init.d/keepalived restart

[root@keepalived-02 ~]# /etc/init.d/keepalived restart

到此爲止一個簡單的 keepalived 單實例環境搭建完成

檢查環境搭建是否成功

要查看 vip 地址須要使用命令 ip add 查看

在 keepalived-01 上查看 vip 地址

在 keepalived-02 上查看 vip 地址

並無發現 vip 地址

正常狀況下

keepalived-01 有 vip 地址

keepalived-02 沒有 vip 地址

若是兩臺服務器都有 vip 地址，說明 keepalived 發生腦裂現象

進行高可用測試，中止 keepalived-01 主機上的 keepalived 服務，應該自動切換到 keepalived-02 上

[root@keepalived-01 ~]# /etc/init.d/keepalived stop

[root@keepalived-02 ~]# ip add

在 keepalived-02 上成功查看到 vip 地址

一次簡單的 keepalived 單實例高可用環境搭建完成