阿里云基于弹性网卡实现高可用ip
一、环境介绍
阿里云服务器CentOS 7.9
[root@keep1 ~]# cat /etc/hosts ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 172.16.208.195 keep1 172.16.208.196 keep2
二、创建阿里云弹性网卡
三、安装keepalived
yum install keepalived -y
四、安装安装自动配置eni网卡（2台都需安装）
阿里云的eni只对CentOS 7.3和CentOS 6.8能自动识别到网卡，其他版本需要配置网卡参数
官方文档
https://www.alibabacloud.com/help/zh/doc-detail/56955.htm?spm=a2c63.p38356.b99.398.5367779fyWo75G
1、安装自动配置eni网卡(系统需高于CentOS 7.3版本)
wget https://image-offline.oss-cn-hangzhou.aliyuncs.com/multi-nic-util/multi-nic-util-0.6.tgz tar -zxvf multi-nic-util-0.6.tgz cd multi-nic-util-0.6 bash install.sh
五、创建阿里云的accessKeyId和accessSecret，授权ECS管理权限（AliyunECSFullAccess）
六、go环境安装
go sdk安装文档:https://help.aliyun.com/document_detail/63640.htm?spm=5176.12573546.1318498.5.433c97a5QYvwVA
api文档:https://www.alibabacloud.com/help/zh/doc-detail/25485.htm?spm=a2c63.p38356.b99.657.25a92647ynVJk3
1、golang安装与代理配置
#golang安装 yum install -y golang #添加代理 go env -w GO111MODULE=on go env -w GOPROXY=https://goproxy.cn,direct
七、创建eni项目
1、创建目录
mkdir /go/eni/ -p
2、创建main脚本文件
package main
import (
"encoding/json"
"flag"
"fmt"
"github.com/aliyun/alibaba-cloud-sdk-go/services/ecs"
"github.com/buger/jsonparser"
"time"
)
type aliyunAuth struct {
regionId string
accessKeyId string
accessSecret string
}
func (self aliyunAuth) ecsBindingEni(NetworkInterfaceId,InstanceId string) {
client, err := ecs.NewClientWithAccessKey(self.regionId,self.accessKeyId,self.accessSecret)
request := ecs.CreateAttachNetworkInterfaceRequest()
request.Scheme = "https"
request.NetworkInterfaceId = NetworkInterfaceId
request.InstanceId = InstanceId
response, err := client.AttachNetworkInterface(request)
if err != nil {
fmt.Print(err.Error())
}
fmt.Printf("response is %#v\n", response)
}
func (self aliyunAuth) ecsRemoveEni(NetworkInterfaceId,InstanceId string) {
client, err := ecs.NewClientWithAccessKey(self.regionId,self.accessKeyId,self.accessSecret)
request := ecs.CreateDetachNetworkInterfaceRequest()
request.Scheme = "https"
request.NetworkInterfaceId = NetworkInterfaceId
request.InstanceId = InstanceId
response, err := client.DetachNetworkInterface(request)
if err != nil {
fmt.Print(err.Error())
}
fmt.Printf("response is %#v\n", response)
}
func (self aliyunAuth) getEcsId( eni_ip string) string {
client, err := ecs.NewClientWithAccessKey(self.regionId,self.accessKeyId,self.accessSecret)
request := ecs.CreateDescribeNetworkInterfacesRequest()
request.Scheme = "https"
request.PrimaryIpAddress = eni_ip
response, err := client.DescribeNetworkInterfaces(request)
result, _ := json.Marshal(response)
ecs_id, _ := jsonparser.GetString(result,"NetworkInterfaceSets","NetworkInterfaceSet","[0]","InstanceId")
if err != nil {
fmt.Print(err.Error())
}
fmt.Printf("response is %#v\n", response)
return ecs_id
}
func main() {
var (
behavior = flag.String("b","attach","执行操作")
eniInterfaceId = flag.String("n", "", "弹性网卡Id")
ecsId = flag.String("e", "", "ECSId")
eniIp = flag.String("i", "", "弹性网卡Ip")
)
flag.Parse()
var eni = new(aliyunAuth)
eni.regionId = "cn-hangzhou"
eni.accessKeyId = "xxxxxxxxxxxx"
eni.accessSecret = "xxxxxxxxxxxxxx"
switch *behavior {
case "attach" :
ecs_id := eni.getEcsId(*eniIp)
if ecs_id == "" {
eni.ecsBindingEni(*eniInterfaceId,*ecsId)
}else {
if *ecsId == ecs_id {
break
}
eni.ecsRemoveEni(*eniInterfaceId,ecs_id)
for i := 0;i < 10; i++ {
time.Sleep(time.Millisecond*500)
if eni.getEcsId(*eniIp) == ""{
eni.ecsBindingEni(*eniInterfaceId,*ecsId)
break
}
}
}
case "remove":
eni.ecsRemoveEni(*eniInterfaceId,*ecsId)
default:
fmt.Println("Usage: { attach|remove }")
}
}
3、go mod与go vendor
[root@keep1 ~]# cd /go/eni/ [root@keep1 eni]# ls main.go [root@keep1 eni]# go mod init eni go: creating new go.mod: module eni [root@keep1 eni]# go mod vendor go: finding module for package github.com/buger/jsonparser go: finding module for package github.com/aliyun/alibaba-cloud-sdk-go/services/ecs go: downloading github.com/aliyun/alibaba-cloud-sdk-go v1.61.865 go: downloading github.com/buger/jsonparser v1.1.1 go: found github.com/aliyun/alibaba-cloud-sdk-go/services/ecs in github.com/aliyun/alibaba-cloud-sdk-go v1.61.865 go: found github.com/buger/jsonparser in github.com/buger/jsonparser v1.1.1 go: downloading github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af go: downloading github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 go: downloading gopkg.in/ini.v1 v1.42.0 go: downloading github.com/json-iterator/go v1.1.5 go: downloading github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
4、编译
go build -o eni main.go
八、keepalived检查脚本
[root@keep2 ~]# cat /etc/keepalived/check_eni.sh #!/bin/bash KEEPALIVED_VIP=192.168.1.100 ENI_VIP=172.31.0.240 if [ `ip a s eth0|grep ${KEEPALIVED_VIP}|wc -l` -eq 1 ]; then if [ `ip a s eth1|grep $ENI_VIP|wc -l` -eq 1 ]; then ping -c 1 -w 1 $ENI_VIP >/dev/null [ $? -ne 0 ]&& exit 1 fi fi
九、keepalived配置文件
1、主配置文件
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc #发送邮箱 } notification_email_from Alexandre.Cassen@firewall.loc #邮箱地址 smtp_server 127.0.0.1 #邮件服务器地址 smtp_connect_timeout 30 router_id LVS_DEVEL-01 #主机名，每个节点不同即可 } vrrp_script check_LVS { script "/etc/keepalived/check_eni.sh" #脚本路径 interval 2 #2秒执行一次 timeout 2 #超时时长 weight -2 #脚本执行失败优先级降低2 rise 3 #连续3次执行脚本成功表示ok fall 3 #连续3次脚本执行失败表示失败 } vrrp_instance VI_1 { state MASTER #节点主从，在另一个节点上为BACKUP interface eth0 #IP地址漂移到的网卡 virtual_router_id 51 #多个节点必须相同 priority 100 #优先级，备用节点的值必须低于主节点的值 advert_int 1 #通告间隔1秒 authentication { auth_type PASS #预共享密钥认证 auth_pass 1111 #密钥 } unicast_src_ip 172.16.208.195 #本机地址 unicast_peer { 172.16.208.196 #目标地址 } notify_master "/go/eni/eni -b attach -n 弹性网卡Id -e ECSId -i 172.16.208.200" track_script { check_LVS } virtual_ipaddress { 192.168.1.100/24 dev eth0 #VIP地址 } }
主配置
2、备配置
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL-02 } vrrp_script check_LVS { script "/etc/keepalived/check_eni.sh" interval 2 timeout 2 weight -2 rise 3 fall 3 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 1111 } unicast_src_ip 172.16.208.196 unicast_peer { 172.16.208.195 } notify_master "/go/eni/eni -b attach -n 弹性网卡Id -e ECSId -i 弹性网卡Ip" track_script { check_LVS } virtual_ipaddress { 192.168.1.100/24 dev eth0 } }
备配置
3、启动keepalived
systemctl start keepalived.service
十、测试
keep1服务器停止keepalived后查看eni的ip是否会绑定到keep2服务器上
1、keep1服务器操作
[root@keep1 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:16:3e:12:e6:15 brd ff:ff:ff:ff:ff:ff inet 172.16.208.195/20 brd 172.16.223.255 scope global dynamic eth0 valid_lft 315354146sec preferred_lft 315354146sec inet 192.168.1.100/24 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::216:3eff:fe12:e615/64 scope link valid_lft forever preferred_lft forever 8: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:16:3e:16:d2:e5 brd ff:ff:ff:ff:ff:ff inet 172.16.208.200/20 brd 172.16.223.255 scope global dynamic eth1 valid_lft 315359996sec preferred_lft 315359996sec inet6 fe80::216:3eff:fe16:d2e5/64 scope link valid_lft forever preferred_lft forever [root@keep1 ~]# systemctl stop keepalived.service
2、keep2服务器查看（弹性网卡已绑定到keep2服务器）
[root@keep2 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:16:3e:16:c4:39 brd ff:ff:ff:ff:ff:ff inet 172.16.208.196/20 brd 172.16.223.255 scope global dynamic eth0 valid_lft 315353960sec preferred_lft 315353960sec inet 192.168.1.100/24 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::216:3eff:fe16:c439/64 scope link valid_lft forever preferred_lft forever 9: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:16:3e:16:d2:e5 brd ff:ff:ff:ff:ff:ff inet 172.16.208.200/20 brd 172.16.223.255 scope global dynamic eth1 valid_lft 315359985sec preferred_lft 315359985sec inet6 fe80::216:3eff:fe16:d2e5/64 scope link valid_lft forever preferred_lft forever
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