本文借鉴于：lvs+keepalived+nginx 搭建主备
防止 nginx 服务器 挂了，需要配置 一个备用nginx。
一、把之前配置好的nginx ，commit 成镜像
docker commit 0dce1173d7c0 nginx1:v1
二、给linux主机加个 虚拟网卡
ifconfig eth0:1 192.168.46.228 netmask 255.255.255.0 up
三、运行刚弄好的 nginx镜像 ，创建容器、同时给 使用 service 命令的 权限（-itd代表后台运行、-p代表映射）
docker run --privileged=true -itd -p 192.168.46.228:80:80 556b04ca3b57 /bin/bash
四、进入刚 创建的容器
docker exec -it 19543a6b3af9 /bin/bash
五、到 init.d 文件夹下
cd /etc/init.d
vi realserver
输入以下内容
SNS_VIP=172.17.0.50 #配置一个虚拟ip，之后输入这个ip地址可以访问到该nginx
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
保存退出
六、更改权限、变为 可 执行
还是在cd /etc/init.d 下
chmod 755 realserver
七 、执行
service realserver start
八、安装 keepalived
yum -y install keepalived
九、更改配置文件
cd /etc/keepalived/
vi keepalived.conf
将以前的内容全部删除 ： ESC :1,$d
如果是主nginx配置以下内容：
global_defs {
# notification_email {
# [email protected]
# }
# notification_email_from [email protected]
# smtp_server smtp.exmail.qq.com
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.17.0.50 #之前配置的虚拟ip
}
}
virtual_server 172.17.0.50 80 { #之前配置的虚拟ip
delay_loop 6
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP
real_server 192.168.46.228 80 { #映射该docker的linux 的ip
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
备：
global_defs {
# notification_email {
# [email protected]
# }
# notification_email_from [email protected]
# smtp_server smtp.exmail.qq.com
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.17.0.50
}
}
virtual_server 172.17.0.50 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP
real_server 192.168.46.227 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
十、启动服务
service keepalived start
配置 第二个 一样，从第二步开始，注意 虚拟ip 要和 第一个一样，就是 172.17.0.50 不要变。
real_server 是 docker run --privileged=true -itd -p 192.168.46.228:80:80 556b04ca3b57 /bin/bash 映射的那个ip