keepalive实现web高可用（keepalive离线安装） 有大用

yum安装
以下为离线安装
1.下载地址：
http://www.keepalived.org/software/keepalived-2.0.6.tar.gz
https://share.weiyun.com/5NNQ15a
linux下载
没有wget 先安装 yum -y install wget
wget http://www.keepalived.org/software/keepalived-2.0.6.tar.gz
解压：

tar -zxvf keepalived-2.0.6.tar.gz

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编译：

cd  keepalived-2.0.6
./configure --prefix=/usr/local/keepalived   #prefix 指定安装的目录

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报错了：configure: error: libnfnetlink headers missing
参考：https://blog.yoodb.com/yoodb/article/detail/1378
解决方案一：（在线安装）

执行yum命令yum install -y libnfnetlink-devel解决上述错误问题

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解决方案二：（离线安装）

Linux执行wget下载rpm包（离线安装libnfnetlink包时所需rpm包，执行wget下载libnfnetlink rpm包命令，此步可以忽略，只是为大家提供个下载libnfnetlink地址），具体命令如下：

wget ftp://mirror.switch.ch/mirror/centos/6/os/x86_64/Packages/libnfnetlink-1.0.0-1.el6.x86_64.rpm
wget ftp://mirror.switch.ch/mirror/centos/6/os/x86_64/Packages/libnfnetlink-devel-1.0.0-1.el6.x86_64.rpm

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或者从官网下载 https://pkgs.org/download/libnfnetlink-devel

rpm -ivh libnfnetlink-devel-1.0.1-4.el7.x86_64.rpm

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阿偶 忘了昨天已经安装了

cd keepalived-2.0.6
 ./configure --prefix=/usr/local/keepalived

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make && make instal  #编译keepalive  不知道为啥我执行了两边才在/usr/local/keepalived

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cp /usr/local/keepalived/sbin/keepalived /etc/init.d/
cp /usr/local/keepalived/sbin/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

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打开
/usr/local/keepalived/etc/keepalived/keepalived.conf

参考：
https://blog.yoodb.com/yoodb/article/detail/1378
https://blog.csdn.net/liurui_wuhan/article/details/81910882

cd   /usr/local/src
wget http://www.keepalived.org/software/keepalived-2.0.7.tar.gz
tar xvf keepalived-2.0.7.tar.gz
cd keepalived-2.0.7
./configure --prefix=/usr/local/keepalived
make && make install
完成后会在以下路径生成：

/usr/local/etc/keepalived/keepalived.conf
/usr/local/etc/sysconfig/keepalived
/usr/local/sbin/keepalived


# keepalived启动脚本变量引用文件，默认文件路径是/etc/sysconfig/，也可以不做软链接，直接修改启动脚本中文件路径即可（安装目录下）
[root@localhost /]# cp /usr/local/keepalived/etc/sysconfig/keepalived  /etc/sysconfig/keepalived 
 
# 将keepalived主程序加入到环境变量（安装目录下）
[root@localhost /]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
 
# keepalived启动脚本（源码目录下），放到/etc/init.d/目录下就可以使用service命令便捷调用
[root@localhost /]# cp /usr/local/src/keepalived-2.0.7/keepalived/etc/init.d/keepalived  /etc/init.d/keepalived
 
# 将配置文件放到默认路径下
[root@localhost /]# mkdir /etc/keepalived
[root@localhost /]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
service keepalived start

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加为系统服务：chkconfig –add keepalived
开机启动：chkconfig keepalived on
查看开机启动的服务：chkconfig –list
启动、关闭、重启service keepalived start|stop|restart

查看当前网卡
nmcli connection show

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参考重命名网卡
https://www.cnblogs.com/feiquan/p/9228066.html

MASTER
vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
	notification_email {
		admin@test.com
	}
	notification_email_from admin@test.com
	smtp_server xxx.smtp.com
	smtp_connect_timeout 30
	router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
	 script "/root/monitor_nginx.sh"
	 interval 2
	 weight 2
}
vrrp_instance VI_1 {
	state MASTER    #(主机为MASTER，备用机为BACKUP)
	interface ens33 #(HA监测网络接口)

	virtual_router_id 61 #(主、备机的virtual_router_id必须相同)
	#mcast_src_ip 192.168.0.99 #(多播的源IP，设置为本机外网IP，与VIP同一网卡)此项可不设置
	priority 90 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
	advert_int 1 #(VRRP Multicast广播周期秒数)
	authentication {
		auth_type PASS #(VRRP认证方式)
		auth_pass 1234 #(密码)
	}

	track_script {
		Monitor_Nginx #(调用nginx进程检测脚本)
	}
	virtual_ipaddress {
            192.168.0.101 #(VRRP HA虚拟地址)
	}
}

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BACKUP方面只需要修改state为BACKUP , priority比MASTER稍低即可

monitor_nginx.sh 内容如下：
vim /root/monitor_nginx.sh
当检测到nginx进程不存在的时候，就干掉所有的keepalived，这时候，请求将会由keepalived的backup接管！！

#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
 then
 killall keepalived
fi

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监控docker脚本

#!/bin/bash
if [ "$(docker ps | grep "nginx" )" == "" ]
 then
 killall keepalived
fi

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~

chmod +x /root/monitor_nginx.sh

都重新启动keepalived：
service keepalived restart
这里请注意，当keepalived启动后，我们可以用命令：
ip add show ens33来看我们的eth66网卡确实被添加了虚拟IP，如下图：

参考
https://blog.csdn.net/bbwangj/article/details/80346428
https://blog.csdn.net/l1028386804/article/details/52577875
http://www.178linux.com/56850

第二次安装遇到的一些问题

缺少 yum -y install openssl-devel

问题 Keepalived PID file ///**//var/run/keepalived.pid not readable (yet?) after start.

1;systemctl daemon-reload 重新加载

2:systemctl enable keepalived.service 设置开机自动启动

3:systemctl disable keepalived.service 取消开机自动启动

4:systemctl start keepalived.service 启动

5:systemctl stop keepalived.service停止

换错了


chmod 644 keepalived.conf 改成644

来自  https://blog.csdn.net/qq_22041375/article/details/103479317