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  • keepalived + nginx

    本文主要介绍keepalived的安装,Nginx自行解决,也可以使用httpd.随便任何服务都可以...

    keepalived 官网http://www.keepalived.org/index.html#

    我不的不吐槽keepalived 官方文档写的...

    环境:

    CentOS 6.6x64 minimal 禁用selinux iptables

    1.安装环境包:

    yum install openssl-devel gcc popt wget  libnl-devel -y

    2.安装keepalived:

    wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz
    tar xvf  keepalived-1.2.19.tar.gz
    cd keepalived-1.2.19
    ./configure
    make
    make install

     (最新的包自己去官网下)

    安装很简单,但是装完我不得不吐槽了..

    3.配置:

    mkdir /etc/keepalived
    ln -s /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
    ln -s /usr/local/etc/sysconfig/keepalived  /etc/sysconfig/keepalived
    ln -s /usr/local/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/keepalived
    ln -s /usr/local/sbin/keepalived /usr/bin/

    主要用ln是为了方便管理.这个keepalived都安装在/etc/user/local 而他却需要的配置文件又是从/开始的 所以搞不懂....

    4.真正的配置keepalived.conf

    cd /usr/local/etc/keepalived/
    vi keepalived.conf

     Master(样例):  

    [root@web2 ~]# cat /etc/keepalived/keepalived.conf 
    ! 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 127.0.0.1
       smtp_connect_timeout 30
       router_id LVS_DEVEL
    }
    
    vrrp_instance VI_1 {
        state MASTER
        interface eth0
        virtual_router_id 51
        mcast_src_ip 192.168.6.25
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            192.168.6.20
        }

    解释一下:
    因为我没有使用LVS所以virtual server段都被删除了....
    global_defs{ #块全局的配置(也没发现能配置什么)
    notification_email {} #通知邮件的收件人,下边from 就是发件人
    支持SMTP.但是不支持用户登录(找了好多文档也没找到用户登陆的user和passwd 谁知道可以留言)
    route_id #不知道什么估计就是keepalived的iD名字吧,或者和LVS有关系

    }

    VRRP_instance VI_1{ #VRRP实例段,关键地方 VI_1 也可以有VI_2,不同的VRRP实例 需要不同的 virtual_router_id

    state  #标记主备的 MASTER主BACKUP是备
    interface #VIP绑定在哪个网卡上
    virtual_router_id # VRRP实例的ID用来区分不同的VRRP
    mcast_src_ip #VRRP包的封装IP,真实网卡IP
    priority #权重,主备之间值不一样,值越大越优先,做实验的时候忘记改了..结果 VIP回不到主上..
    advert_int #指定VRRP广播包发送间隔
    authentication #VRRP实例之间的认证
    virtual_ipaddress #VIP 就是用户要访问的IP地址.这个ip地址会在不同的keepalived实例上飞来飞去

    }

    5.查看IP

    [root@web2 ~]# ip addr
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 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 52:54:00:35:cb:3d brd ff:ff:ff:ff:ff:ff
    inet 192.168.6.25/24 brd 192.168.6.255 scope global eth0
    inet 192.168.6.20/32 scope global eth0
    inet6 fe80::5054:ff:fe35:cb3d/64 scope link
    valid_lft forever preferred_lft forever

    6.监控

    这个东西不会主动去监控服务是否正常.自己写脚本监控主机上的服务如果服务不正常就把keepalived停掉就好了...

    BACKUP(样例):

    [root@we1 ~]# cat /etc/keepalived/keepalived.conf 
    ! 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_instance VI_1 {
        state BACKUP
        interface eth0
        virtual_router_id 51
        priority 99
        mcast_src_ip 192.168.6.26
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            192.168.6.20
        }
    }
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  • 原文地址:https://www.cnblogs.com/idnf/p/4651648.html
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