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  • Nginx+keepalived 脚本安装主从双机热备自动切换解决方案

    Nginx+keepalived 脚本安装主从双机热备自动切换解决方案
    2013-07-02 19:24:13
    标签：filesnginx keepalived
    原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://kling.blog.51cto.com/3320545/1240359

    Nginx+keepalived主从双机热备自动切换解决方案


    测试环境如下：

    系统：Ceentos 6.4 64位

    主nginx服务器：192.168.122.5

    备nginx服务器：192.168.122.6

    VIP：192.168.122.15

    一、Nginx+keepalived安装—脚本安装

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    #!/bin/bash
    # author: kuangl
    # mail: kuangl@orient-media.com
    # description: The installation of Nginx files.
    # -------------------------------------------------------- #
    ## Nginx_install
    # -------------------------------------------------------- #
    # Nginx installation
    #CURRENT_PATH=$(pwd)
    for i in $(rpm -q gcc gcc-c++ kernel-devel openssl-devel zlib-devel popt-devel popt-static libnl-devel wgetmake |grep'not installed' | awk '{print $2}')
    do
    yum -y install$i
    done
    [ -d /root/software]
    [ "$?"!= 0 ] && mkdir/root/software
    cd /root/software
    [ !-e pcre-8.33.tar.gz ] && wgetftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.gz
    tar -zxvf pcre-8.33.tar.gz
    cd pcre-8.33
    ./configure
    make && make install
    echo $? || [ $? != 0] || echo" installation pcrefailed"|| exit 1
    cd /root/software
    [ ! -e nginx-1.2.9.tar.gz ] && wget http://nginx.org/download/nginx-1.2.9.tar.gz
    tar -zxvf nginx-1.2.9.tar.gz
    cd nginx-1.2.9
    ./configure--prefix=/usr/local/nginx--with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module
    make && make install
    echo $? || [ $? != 0] || echo" installationnginxfailed"|| exit 1
    # -------------------------------------------------------- #
    ## Keepalived_intsall
    # -------------------------------------------------------- #
    # Keepalived installation
    cd /root/softwarae
    [ ! -e keepalived-1.2.4.tar.gz ] &&wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
    tar -zxvf keepalived-1.2.4.tar.gz
    cd keepalived-1.2.4
    ln -s /usr/src/kernels/$(uname-r) /usr/src/kernels/linux
    ./configure--prefix=/usr--bindir=/usr/bin--sbindir=/usr/bin--libexecdir=/usr/libexec--localstatedir=/var--libdir=/lib64--infodir=/usr/share/info--sysconfdir=/etc--mandir=/usr/local/share/man--with-kernel-dir=/usr/src/kernels/linux
    make && make install
    echo $? || [ $? != 0] || print " installation keepalivedfailed"|| exit 1
    chkconfig --add keepalived
    chkconfig --level 345 keepalived on


    二、主Nginx 配置

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    [root@node5 conf]# mkdir -p /var/www/html
    [root@node5 conf]# cat "192.168.122.5" > /var/www/html/index.html
    [root@node5 conf]# vim nginx.conf

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    [root@node5 conf]# ../sbin/nginx -s reload
    [root@node5 conf]# curl http://192.168.122.5
    192.168.122.5


    三、主Keepalived配置

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    [root@node6 conf]# vim /etc/keepalived/keepalived.conf
    ! Configuration Filefor keepalived
    global_defs {
    notification_email {
    404060@qq.com
    138162@139.com
    }
    notification_email_from 404060@qq.com
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id LVS_DEVEL
    }
    vrrp_script chk_nginx {
    script "/etc/keepalived/chk_nginx.keepalived.sh"
    interval 2
    weight 2
    }
    vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 200
    advert_int 1
    authentication {
    auth_type PASS
    auth_pass kuangling
    }
    track_script {
    chk_nginx.keepalived
    }
    virtual_ipaddress {
    192.168.122.15
    }
    }


    四、备nginx配置

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    [root@node6 conf]# mkdir -p /var/www/html
    [root@node6 conf]# cat "192.168.122.6" > /var/www/html/index.html
    [root@node6 conf]# vim nginx.conf

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    [root@node6 conf]# ../sbin/nginx -s reload
    [root@node6 conf]# curl http://192.168.122.6
    192.168.122.6


    五、备keepalived配置

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    [root@node6 conf]# vim /etc/keepalived/keepalived.conf
    ! Configuration Filefor keepalived
    global_defs {
    notification_email {
    404060@qq.com
    138162@139.com
    }
    notification_email_from 404060@qq.com
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id LVS_DEVEL
    }
    vrrp_script chk_nginx {
    script "/etc/keepalived/chk_nginx.keepalived.sh"
    interval 2
    weight 2
    }
    vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
    auth_type PASS
    auth_pass kuangling
    }
    track_script {
    chk_nginx.keepalived
    }
    virtual_ipaddress {
    192.168.122.15
    }
    }


    六、分别在2台nginx服务器上添加检测脚本：

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    [root@node6 conf]# vim /etc/keepalived/chk_nginx.keepalived.sh
    #!/bin/bash
    # description:
    # 定时查看Nginx是否存在，如果不存在则启动Nginx
    # 如果启动失败，则停止keepalived
    status=`ps-C nginx --no-header |wc-l`
    if [ $status -eq 0 ];then
    /usr/local/nginx/sbin/nginx
    sleep 3
    if [ `ps -C nginx --no-header |wc-l` -eq 0 ];then
    killall keepalived
    fi
    fi
    [root@node6 conf]#chmod +x /etc/keepalived/chk_nginx.keepalived.sh


    七、测试

    分别在2台nginx上启动nginx和keepalived服务，然后分别用ip a 查看ip


    本文出自 “&思远晨曦” 博客，请务必保留此出处http://kling.blog.51cto.com/3320545/1240359



    注：

    1.这篇文章是keepalived单主高可用配置

    2.keepalived没有解决自身故障的问题，更多是针对操作系统和网络故障来进行vip迁移

    3.keepalived没有和nginx联动，也就是说nginx故障的情况下，keepalived不会知道，也就不会迁移vip，这个问题的解决方法：将监控脚步长期在后台持续运行（while无限循环，sleep 1）

    脚步改造如下：

    #!/bin/bash
    # description:
    # 定时查看Nginx是否存在，如果不存在则启动Nginx
    # 如果启动失败，则停止keepalived
    while [ a==a ]
    do
    status=`ps -C nginx --no-header |wc -l`
    if [ $status -eq 0 ];then
    /usr/local/nginx/sbin/nginx > /dev/null 2>&1
    sleep 3
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
    killall keepalived > /dev/null 2>&1
    fi
    fi
    sleep 1
    done
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  • 原文地址：https://www.cnblogs.com/lixigang/p/5371823.html
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