【Linux】Keepalived实现多实例高可用配置

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title: 【Linux】Keepalived实现多实例高可用配置 categories:

  • Linux
  • Keepalived tags:
  • Keepalived urlname: use-keepalived-in-two-instance

keepalived 双实例配置

实验环境

  • server_1(tomcat_1+mysql_1)，IP：192.168.68.221
  • server_2(tomcat_2+mysql_2)，IP：192.168.68.222
  • tomcat_VIP：192.168.68.223
  • mysql_VIP：192.168.68.224

期望效果：在正常工作时tomcat_1作为主用，mysql_2作为主用。当tomcat_1应用异常时，将对外提供tomcat服务的虚拟IP漂移至tomcat_2，实现tomcat故障转移。当mysql_2应用出现异常时，将tomcat应用连接mysql时的虚拟IP漂移至mysql_1，实现mysql的故障转移。

keepalived配置方法

  • server_1 keepalived配置详解
# 在server_1中安装keepalived
# 安装相关依赖包
    yum install kernel-devel openssl-devel gcc make -y
    tar -xvf keepalived.tar.gz
    cd keepalived-1.2.19
    ./configure --prefix=/ --with-kernel-dir/usr/src/kernels/2.6.32-642.el6.x86_64/
    make && make install
# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    global_defs {
       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
    }
    # 配置mysql_check脚本
    vrrp_script mysql_check_port {
            script "/etc/keepalived/doublecheck/check.sh"
            interval 3
            weight 2
    }
    # 配置tomcat_check配置脚本
    vrrp_script web_check_port {
            script "/etc/keepalived/check/check.sh"
            interval 3
            weight 2
    }
    # 配置server_1中tomcat_1为主用，且优先级较高，并且设置VIP为192.168.68.223
    vrrp_instance VI_1 {
        state MASTER
        interface eth0
        virtual_router_id 51
        macst_src_ip 192.168.68.221
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        track_script {
            web_check_port
            }
        virtual_ipaddress {
            192.168.68.223/24
        }
    }
    # 配置server_1中的mysql_1为备用，且优先级较低，并设置VIP为192.168.68.224
    vrrp_instance VI_2 {
        state BACKUP
        interface eth0
        virtual_router_id 52
        macst_src_ip 192.168.68.221
        priority 90
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        track_script {
            mysql_check_port
            }
        virtual_ipaddress {
            192.168.68.224/24
        }
    }
  • server_2keepalived配置详解
# 在server_2中安装keepalived
# 安装相关依赖包
    yum install kernel-devel openssl-devel gcc make -y
    tar -xvf keepalived.tar.gz
    cd keepalived-1.2.19
    ./configure --prefix=/ --with-kernel-dir/usr/src/kernels/2.6.32-642.el6.x86_64/
    make && make install
# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    global_defs {
       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
    }
    # 配置mysql_check脚本
    vrrp_script mysql_check_port {
            script "/etc/keepalived/doublecheck/check.sh"
            interval 2
            weight 2
    }
    # 配置tomcat_check配置脚本
    vrrp_script web_check_port {
            script "/etc/keepalived/check/check.sh"
            interval 3
            weight 2
    }
    # 配置server_2中tomcat_2为备用，且优先级较低，并且设置VIP为192.168.68.223
    vrrp_instance VI_1 {
        state BACKUP
        interface eth0
        virtual_router_id 51
        macst_src_ip 192.168.68.222
        priority 90
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        track_script {
            web_check_port
            }
        virtual_ipaddress {
            192.168.68.223/24
        }
    }
    # 配置server_2中的mysql_2为主用，且优先级较高，并设置VIP为192.168.68.224
    vrrp_instance VI_2 {
        state MASTER
        interface eth0
        virtual_router_id 52
        macst_src_ip 192.168.68.222
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        track_script {
            mysql_check_port
            }
        virtual_ipaddress {
            192.168.68.224/24
        }
    }
  • 定义在vrrp_script中的相关check脚本
# 相关脚本
# mkdir /etc/keepalived/doublecheck/
# mkdir /etc/keepalived/check/
# vim /etc/keepalived/doublecheck/check.sh
    #!/bin/bash
    MYSQL_ALIVE=`ps -C mysqld |grep -v PID|wc -l`
    if [ $MYSQL_ALIVE -eq 0 ];then
    service mysql restart
    sleep 3
    if [ `ps -C mysqld |grep -v PID |wc -l` -eq 0 ];then
    killall keepalived
    fi
    fi
# vim /etc/keepalived/check/check.sh
    if [ $(ps aux | grep tomcat | grep -v grep | wc -l) != 1 ];then
    cd /usr/local/tomcat/bin;./startup.sh >> /dev/null 2>&1
    sleep 2
    if [ `ps aux | grep tomcat | grep -v grep | wc -l` != 1 ];then
    killall keepalived
    fi
    fi
 # chmod +x /etc/keepalived/check/check.sh /etc/keepalived/doublecheck/check.sh
  • 启动keepalived服务
# service keepalived start
  • 相关调试信息
通过查看/var/log/message