单实例主备切换---keepalived

时间：2020-03-19 09:46:34 收藏：0 阅读：54

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！！！

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