使用场景：对于装有ubuntu操作系统的内部虚拟机要安装配置nginx的高可用，没有公网，无法通过网络直接安装keepalived，于是需要先下载好keepalived的包，以及安装keepalived所需要的的依赖包，因此选择一台有网的ubuntu机器，和内网的操作系统版本相同;如下
1.在通互联网的A机器上，apt一键式下载keepalived的依赖包,不安装，脚本depends.sh如下
depends.sh
apt-cache depends $1|grep Depends|awk -F: '{print $2}'>> dependspackage
echo $1 >> dependspackage
for i in `cat dependspackage`;do aptitude download $i ;done
Usage:
sh depends.sh packagename
eg: sh depends keepalived
2.下载好所有keepalived所需要的的deb后，进行安装：
执行：sudo apt install ./*deb
3.配置keepalived：
机器A：MASTER
机器B： BACKUP
两个节点均设置：
vi /etc/sysctl.conf
#net.ipv4.ip_forward=1
#该文件表示是否允许进程邦定到非本地地址
net.ipv4.ip_nonlocal_bind=1
sudo sysctl -p 生效
机器A：MASTER，配置如下：
global_defs {
notification_email {
xxxxx@qq.com
}
notification_email_from xxxx@163.com
smtp_server smtp.163.com
smtp_connection_timeout 30
router_id node2
}
vrrp_script chk_http_port {
script "/usr/local/src/check_nginx_pid.sh"
interval 10 #轮询
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface ens39
virtual_router_id 66
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
192.168.124.11
}
}
机器B： BACKUP，配置如下：
global_defs {
notification_email {
xxxxx@qq.com
}
notification_email_from xxxx@163.com
smtp_server smtp.163.com
smtp_connection_timeout 30
router_id node2
}
vrrp_script chk_http_port {
script "/usr/local/src/check_nginx_pid.sh"
interval 10 #轮询
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 66
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
192.168.124.11
}
}
check_nginx_pid.sh
#/bin/bash
A=`ps -C nginx --no-header | wc -l`
if [ $A -eq 0 ];then
service nginx restart
if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
killall keepalived
fi
fi
或者：
#!/bin/bash
echo $password |sudo -S killall -0 nginx > /dev/null 2>&1
res=`echo $?`
while [ $res -ne 0 ];do
sudo systemctl restart nginx
sleep 3
res=`echo $?`
done