单实例主备切换---keepalived

一:环境说明

• 1：操作系统rhel7内核   3.10.0-123.el7.x86_64 
  2：keepalived软件版本  keepalived-1.3.9.tar.gz

二:环境配置

• 1:主Keepalived服务器IP地址    192.168.1.10
  2：备Keepalived服务器IP地址   192.168.1.20
  3：Keepalived 虚拟IP地址      192.168.1.15 [局域网中任意未使用IP]

三:安装流程

• 1：上传Keepalived软件到/bankapp目录

• 2: 解压软件

  tar -zxvf keepalived-1.3.9.tar.gz 
  cd keepalived-1.3.9

• 编译以及编译安装

  ./configure --prefix=/usr/local/keepalived
  make && make install

• 注意：
  configure: error:
  !!! OpenSSL is not properly installed on your system. !!!
  !!! Can not include OpenSSL headers files.

  解决办法:
  openssl version -a 查看一下openssl是否安装
  yum -y install openssl-devel --安装开发包，包含头文件和链接库

• 3：制作快捷启动，在源文件的目录./keepalived-1.3.5/keepalived/etc/init.d下有两个快捷启动文件和生成/usr/local/keepalived/目录下一个配置文件需要复制

  1:cp  /bankapp/keepalived-1.3.9/keepalived/etc/init.d/keepalived  /etc/rc.d/init.d/
  2:cp  /bankapp/keepalived-1.3.9/keepalived/etc/sysconfig/keepalived   /etc/sysconfig
  #cp  /usr/local/keepalived/etc/sysconfig/keepalived      /etc/sysconfig
  
  3:mkdir -p /etc/keepalived   
   cp  /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
  
  4:cp  /usr/local/keepalived/sbin/keepalived   /usr/sbin
  
  
  ###注意 /etc/init.d是/etc/rc/init.d软链接文件

• 4:设置为服务，开机启动

  vi /etc/rc.local
  
  # THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
  #
  # It is highly advisable to create own systemd services or udev rules
  # to run scripts during boot instead of using this file.
  #
  # In contrast to previous versions due to parallel execution during boot
  # this script will NOT be run after all other services.
  #
  # Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
  # that this script will be executed during boot.
  
  touch /var/lock/subsys/local
  
  /etc/init.d/keepalived start

四:keepalived配置

• 1:主机修改配置文件

• cp keepalived.conf keepalived.conf.20200319   #备份原来的
  vi  /etc/keepalived/keepalived.conf 
  ! Configuration File for keepalived
  
  vrrp_instance VI_1 {
      state BACKUP          #mdodel :MASTER-BACKUP,BACKUP-BACKUP
      interface eno16777728 
      virtual_router_id 51   #主备要一致
      priority 150        #优先级主要比从高50，一般是50为一个分级
      advert_int 1
      nopreempt         #非抢占式，主服务器要配置,备机不配置
      authentication {
          auth_type PASS
          auth_pass 1111
      }
      virtual_ipaddress {
          192.168.1.15
      }
  }

• 2：备机也按照主机那样安装，配置

• 然后修改配置文件

  ! Configuration File for keepalived
  
  
  vrrp_instance VI_1 {
      state BACKUP        #备机也是BACKUP
      interface eno16777728
      virtual_router_id 51
      priority 100
      advert_int 1
      authentication {
          auth_type PASS
          auth_pass 1111
      }
      virtual_ipaddress {
          192.168.1.15
      }
  }

五:启动服务

• 1:service keepalived start
  #service keepalived   stop
  #service keepalived restart
  
  2:ps - ef | grep keep |grep -v grep   查看进程，有3个进程说明正常启动     
  root       8732      1  0 19:14 ?        00:00:00 /usr/local/keepalived/sbin/keepalived -D
  root       8733   8732  0 19:14 ?        00:00:00 /usr/local/keepalived/sbin/keepalived -D
  root       8734   8732  0 19:14 ?        00:00:00 /usr/local/keepalived/sbin/keepalived -D

六：查看网卡信息

• 主Keepalived网卡信息

# ip addr show eno16777728 
2: eno16777728: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:5d:1a:f0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.10/24 brd 192.168.1.255 scope global noprefixroute eno16777728
       valid_lft forever preferred_lft forever
    inet 192.168.1.15/32 scope global eno16777728
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe5d:1af0/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

• 备Keepalived网卡信息

# ip addr show eno16777728 
2: eno16777728: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:5a:67:0e brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.20/24 brd 192.168.1.255 scope global eno16777728
       valid_lft forever preferred_lft forever
    inet 192.168.1.15/32 scope global eno16777728
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe5a:670e/64 scope link 
       valid_lft forever preferred_lft forever
    
    ###我这备机也有虚拟IP，可能裂脑了
    
    

• 注意error:

• #eno16777728: <BROADCAST,MULTICAST,UP,LOWER_UP>  这里会显示网卡模式
      #主备都有VIP，裂脑了，通过修改网卡的为混杂模式解决
  
  ifconfig  eno16777728  #临时修改
  eno16777728: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
          inet 192.168.1.10  netmask 255.255.255.0  broadcast 192.168.1.255
          inet6 fe80::20c:29ff:fe5d:1af0  prefixlen 64  scopeid 0x20<link>
          ether 00:0c:29:5d:1a:f0  txqueuelen 1000  (Ethernet)
          RX packets 15605  bytes 12116937 (11.5 MiB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 8017  bytes 1558236 (1.4 MiB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
  
  #永久修改开机执行命令:
  vi /etc/rc.local
  ifconfig eno16777728 promisc
  
  
  #注意关闭防火墙 
  systemctl status firewalld
  systemctl disable firewalld
  

七:测试

• 1:主机
  ip addr show eno16777728 |grep 192.168.1.15
      inet 192.168.1.15/32 scope global eno16777728
  
  2：备机
  ip addr show eno16777728 | grep 192.168.1.15
  无输出
  
  3:停掉主机keepalived服务
  [root@docker log]# service keepalived stop
  Stopping keepalived (via systemctl):                       [  OK  ]
  [root@docker log]# ip addr show eno16777728 |grep 192.168.1.15
  [root@docker log]#   
  
  4:查看备机
  [root@registry log]# ip addr show eno16777728 | grep 192.168.1.15
      inet 192.168.1.15/32 scope global eno16777728
  
   成功！！！
  

?

单实例主备切换---keepalived

原文：https://www.cnblogs.com/zhoujun007/p/12521564.html