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/srccd /usr/src/keepalived-2.0.8sudo apt-get install autoconfaclocalautoconfautoheaderautomake --add-missingsudo apt-get install libssl-dev./configure --prefix=/usr/local/keepalivedmake && make installcd /usr/local/keepalived/sbin./keepalivedps -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