nginx高可用集群的实现过程

  [root@topcheer dev]# yum install keepalived -y  已加载插件：fastestmirror, langpacks  Loading mirror speeds from cached hostfile   * base: mirrors.cn99.com   * epel: ftp.riken.jp   * extras: mirrors.cn99.com   * updates: mirror.lzu.edu.cn  gitlab_gitlab-ce/x86_64/signature                                         | 836 B 00:00:00  gitlab_gitlab-ce/x86_64/signature                                         | 1.0 kB 00:00:00 !!!  gitlab_gitlab-ce-source/signature                                         | 836 B 00:00:00  gitlab_gitlab-ce-source/signature                                         | 951 B 00:00:00 !!!  正在解决依赖关系  --> 正在检查事务  ---> 软件包 keepalived.x86_64.0.1.3.5-16.el7 将被 安装  --> 正在处理依赖关系 libnetsnmpmibs.so.31()(64bit)，它被软件包 keepalived-1.3.5-16.el7.x86_64 需要  --> 正在处理依赖关系 libnetsnmpagent.so.31()(64bit)，它被软件包 keepalived-1.3.5-16.el7.x86_64 需要  --> 正在检查事务  ---> 软件包 net-snmp-agent-libs.x86_64.1.5.7.2-43.el7 将被 安装  --> 解决依赖关系完成  ​  依赖关系解决  ​  ==========================================================================================================================================   Package                 架构            版本                源             大小  ==========================================================================================================================================  正在安装:   keepalived                x86_64           1.3.5-16.el7            base           331 k  为依赖而安装:   net-snmp-agent-libs           x86_64           1:5.7.2-43.el7           base           706 k  ​  事务概要  ==========================================================================================================================================  安装 1 软件包 (+1 依赖软件包)  ​  总下载量：1.0 M  安装大小：3.0 M  Downloading packages:  (1/2): net-snmp-agent-libs-5.7.2-43.el7.x86_64.rpm                                 | 706 kB 00:00:00  (2/2): keepalived-1.3.5-16.el7.x86_64.rpm                                     | 331 kB 00:00:00  ------------------------------------------------------------------------------------------------------------------------------------------  总计                                                   1.8 MB/s | 1.0 MB 00:00:00  Running transaction check  Running transaction test  Transaction test succeeded  Running transaction   正在安装  : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64                                       1/2   正在安装  : keepalived-1.3.5-16.el7.x86_64                                            2/2   验证中   : keepalived-1.3.5-16.el7.x86_64                                            1/2   验证中   : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64                                       2/2  ​  已安装:   keepalived.x86_64 0:1.3.5-16.el7  ​  作为依赖被安装:   net-snmp-agent-libs.x86_64 1:5.7.2-43.el7  ​  完毕！

  [root@topcheer keepalived]# cat keepalived.conf  global_defs {    notification_email {    acassen@firewall.loc    failover@firewall.loc    sysadmin@firewall.loc    }    notification_email_from Alexandre.Cassen@firewall.loc    smtp_server 192.168.180.113    smtp_connect_timeout 30    router_id LVS_DEVEL    }    vrrp_script chk_http_port {    script "/usr/local/src/nginx_check.sh"    interval 2 #（检测脚本执行的间隔）    weight 2    }    vrrp_instance VI_1 {     state BACKUP # 备份服务器上将 MASTER 改为 BACKUP     interface ens33 //网卡     virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同     priority 40 # 主、备机取不同的优先级，主机值较大，备份机值较小     advert_int 1    authentication {     auth_type PASS     auth_pass 1111    }    virtual_ipaddress {    192.168.180.114 // VRRP H 虚拟地址    }  }

  [root@topcheer src]# cat nginx_check.sh  #!/bin/bash  A=`ps -C nginx ▒Cno-header |wc -l`  if [ $A -eq 0 ];then    /usr/local/nginx/sbin/nginx    sleep 2    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then      killall keepalived    fi  fi[root@topcheer src]#