keepalived+Nginx 搭建高可用主从式集群

前言

这个东西弄了两天的时间,搞的头都大了,终于在小伙伴的帮助下,搭建出来了,下面记录一下搭建过程中的问题和步骤!

环境准备

keepalived安装之前，需要环境：wget、gcc、pcre、openssl、zlib、popt-devel 的支持
安装命令如下:

yum -y install wget 

yum install gcc-c++

yum install -y pcre pcre-devel

yum install -y openssl openssl-devel 

yum install -y zlib zlib-devel

yum install –y popt-devel

nginx的安装教程

keepalived安装和配置

1. 解压keepalived到root目录下

tar -zxvf keepalived-2.0.18.tar.gz 

2. 进入解压完成的keepalived-2.0.18目录并进行配置

cd keepalived-2.0.18

./configure -prefix=/usr/local/keepalived-2.0.18

3. 编译和安装

	make && make install 

4. 因为我安装路径非默认路径故需修改相关路径，保证keepalived能正常启动

修改 /etc/init.d/keepalived 文件

将 . /etc/sysconfig/keepalived 修改为
. /usr/local/keepalived-2.0.18/etc/sysconfig/keepalived**

5. 将keepalived注册为服务

cp /root/keepalived-1.3.4/keepalived/etc/init.d/keepalived /etc/init.d/keepalived 

cp /root/keepalived-1.3.4/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

6. 编辑配置文件(*最重要)
   我使用Xftp进行找个响应的配置文件进行编辑

主机配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER   #主机是MASTER  从机是BACKUP
    interface enp0s3   # 是你的网卡的名称,一定不要写错
    virtual_router_id 51
    priority 100      #优先级  主机100 从机90  越大优先级越高
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
		192.168.56.99    #VIP   是你自己随便设置的  但是不要重复并在一个网段
    }
}

从机配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP
    interface enp0s3
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
		192.168.56.99  
    }
}

7. 测试 启动keepalived

	service keepalived start 

8. 查看keepalived的运行状态

	service keepalived status 

一定要看到running才算启动成功

9. 把修改主机nginx的欢迎页面index.html,以区分主从
   

10. 测试我们搭建好的集群
    主机和从机nginx和keepalived都启动

	systemctl stop nginx.service
	
	service keepalived start

11 在浏览器上输入我们设置的VIP我的是192.168.56.99

12. 很显然它优先选择了主机,然后我们主机keepalived服务关掉

	service keepalived stop

在主机宕机的情况,他会启动从机,至此我们主从式集群就搭建完毕了,下面是我遇到的一些问题!

查看网卡名称

1. cd 到 /etc/sysconfig/network-scripts/ 目录下

	cd /etc/sysconfig/network-scripts/

1. ls 查看目录下的文件
   
2. ifcfg-enp0s3就是我的网卡名称 ,但是在配置keepalived只写enp0s3就可以了

pcre-8.36/missing:行81: aclocal-1.14: 未找到命令

出现如上错误,只需执行 autoreconf -iv f命令。即可