linux中keepalived实现nginx高可用配置

linux中keepalived实现nginx高可用配置

安装keepalived

运行如下命令即可

tar -zxvf keepalived-2.0.8.tar.gz -C /usr/src

cd /usr/src/keepalived-2.0.8

sudo apt-get install autoconf

aclocal

autoconf

autoheader

automake --add-missing

sudo apt-get install libssl-dev

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

make && make install

cd /usr/local/keepalived/sbin

./keepalived

ps -ef | grep keepalived

修改keepalived配置文件

keepalived的作用，基本上是和多台nginx服务器通信，当主服务器宕机，将ip分法给备用服务器

例如，写类似如下代码

    在你的linux网卡中添加一个ip地址，这个ip地址可以ping通，也就是多个nginx服务器，可以共用这一个ip，通过keepalived决定谁可以拥有这个ip

    ip addr add yourtestip dev ens33

    ip addr

    ping yourtestip

配置keepalived配置文件

sudo vim /usr/local/keepalived/etc/keepalived/keepalived.conf

    ! Configuration File for keepalived

    global_defs {

        # 服务器宕机发送通知邮件

        notification_email {

            acassen@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

    }

    # 虚拟路由器配置

    vrrp_instance VI_1 {

        state MASTER                                # 设置当前nginx服务器为主节点，备用nginx服务器对应设置成BACKUP即可

        interface eth0                              # 绑定服务器网卡

        virtual_router_id 51                        # 主备nginx服务器此id必须一致

        priority 100                                # 设置优先级，1-254之间，备用服务器的结点优先级设置低点

        advert_int 1                                # 信息发送间隔，主备都要一致

        authentication {                            # 授权信息，主备服务器一致

            auth_type PASS

            auth_pass 1111

        }

        virtual_ipaddress {                         # 虚拟IP，主备服务器必须一致，网段必须和nginx一致

            192.168.200.16

        }

        notify_master "/usr/local/keepalived/sbin/notify_sh master"  # 主服务器宕机，备用服务器要成为主服务器则调用此脚本

        notify_backup "/usr/local/keepalived/sbin/notify_sh backup"

        notify_fault "/usr/local/keepalived/sbin/notify_sh fault"

    }

    vrrp_script chk_health {

        script "[[`ps -ef | grep nginx | grep -v grep | wc -l`-ge 2]] && exit 0 || exit 1"          # 判断nginx进程是否大于等于2

        interval 1          # 1秒钟执行一次

        weight -2           # nginx宕机，本机权重降低2

    }

    track_script {

        chk_health          # 检查nginx

    }

notify_sh脚本

    #!/bin/bash

    case $1 in

        master)

            /usr/local/nginx/sbin/nginx

            exit 0

            ;;

        backup)

            /usr/local/nginx/sbin/nginx -s stop

            /usr/local/nginx/sbin/nginx

            exit 0

            ;;

        fault)

            /usr/local/nginx/sbin/nginx -s stop

            exit 0

        *)

            echo "(notify.sh(master|backup|fault)"

            exit 1

        ;;

    esac

巴特西

linux中keepalived实现nginx高可用配置

安装keepalived

修改keepalived配置文件

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