架构方案如下：
---Open××× server 搭建部署
1、在Open×××-1 server上安装流程
（1.添加epel源
[root@ShangHai-×××-1 ~]# yum install epel-release
（2.安装Open×××
[root@ShangHai-×××-1 ~]# yum install open*** lzo-devel easy-rsa -y
（3.复制server示例文件
[root@ShangHai-×××-1 ~]# cp /usr/share/doc/open***-*/sample/sample-config-files/server.conf /etc/open***
（4.使用easy-rsa生成服务器证书以及密钥
[root@ShangHai-×××-1 ~]# cp -R /usr/share/easy-rsa/ /etc/open*** [root@ShangHai-×××-1 ~]# cd /etc/open***/easy-rsa/2.0/ #vars文件修改如下 [root@ShangHai-×××-1 2.0]# egrep -v '^$|^#' vars export EASY_RSA="`pwd`" export OPENSSL="openssl" export PKCS11TOOL="pkcs11-tool" export GREP="grep" export KEY_CONFIG=`$EASY_RSA/whichopensslcnf $EASY_RSA` export KEY_DIR="$EASY_RSA/keys" echo NOTE: If you run ./clean-all, I will be doing a rm -rf on $KEY_DIR export PKCS11_MODULE_PATH="dummy" export PKCS11_PIN="dummy" export KEY_SIZE=2048 export CA_EXPIRE=3650 export KEY_EXPIRE=3650 export KEY_COUNTRY="CN" export KEY_PROVINCE="BJ" export KEY_CITY="BeiJing" export KEY_ORG="example.com" export KEY_EMAIL="[email protected]" export KEY_OU="www.example.com" export KEY_NAME="EasyRSA" #初始化配置 [root@ShangHai-×××-1 2.0]# source vars [root@ShangHai-×××-1 2.0]# ./clean-all #生成CA证书 [root@oShangHai-×××-1 2.0]# ./build-ca Generating a 2048 bit RSA private key ..............................+++ ................................+++ writing new private key to 'ca.key' ----- You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [CN]: State or Province Name (full name) [BJ]: Locality Name (eg, city) [BeiJing]: Organization Name (eg, company) [example.com]: Organizational Unit Name (eg, section) [www.example.com]: Common Name (eg, your name or your server's hostname) [example.com CA]: Name [EasyRSA]: Email Address [[email protected]]: #生成服务器证书 [root@oShangHai-×××-1 2.0]# ./build-key-server server Generating a 2048 bit RSA private key ....................+++ ....................................................................................+++ writing new private key to 'server.key' ----- You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [CN]: [直接回车] State or Province Name (full name) [BJ]:[直接回车] Locality Name (eg, city) [BeiJing]:[直接回车] Organization Name (eg, company) [example.com]:[直接回车] Organizational Unit Name (eg, section) [www.example.com]:[直接回车] Common Name (eg, your name or your server's hostname) [server]:[直接回车] Name [EasyRSA]:[直接回车] Email Address [[email protected]]:[直接回车] Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []:[直接回车] An optional company name []:[直接回车] Using configuration from /etc/open***/easy-rsa/2.0/openssl-1.0.0.cnf Check that the request matches the signature Signature ok The Subject's Distinguished Name is as follows countryName :PRINTABLE:'CN' stateOrProvinceName :PRINTABLE:'BJ' localityName :PRINTABLE:'BeiJing' organizationName :PRINTABLE:'example.com' organizationalUnitName:PRINTABLE:'www.example.com' commonName :PRINTABLE:'server' name :PRINTABLE:'EasyRSA' emailAddress :IA5STRING:'[email protected]' Certificate is to be certified until Jul 18 03:07:04 2025 GMT (3650 days) Sign the certificate? [y/n]:y 1 out of 1 certificate requests certified, commit? [y/n]y Write out database with 1 new entries Data Base Updated #生成服务器密钥 [root@oShangHai-×××-1 2.0]# ./build-dh Generating DH parameters, 2048 bit long safe prime, generator 2 This is going to take a long time ........................+............................................................................................+...........................+.............................................+........................+...................................................................................................................+........+.............................................+...............................................................................................................+..............++*++*
（5.生成客户端证书和密钥
[root@ShangHai-×××-1 2.0]# ./build-key client Generating a 2048 bit RSA private key ......+++ .......................+++ writing new private key to 'client.key' ----- You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [CN]:[直接回车] State or Province Name (full name) [BJ]:[直接回车] Locality Name (eg, city) [BeiJing]:[直接回车] Organization Name (eg, company) [example.com]:[直接回车] Organizational Unit Name (eg, section) [www.example.com]:[直接回车] Common Name (eg, your name or your server's hostname) [client]:[直接回车] Name [EasyRSA]:[直接回车] Email Address [[email protected]]:[直接回车] Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []:[直接回车] An optional company name []:[直接回车] Using configuration from /etc/open***/easy-rsa/2.0/openssl-1.0.0.cnf Check that the request matches the signature Signature ok The Subject's Distinguished Name is as follows countryName :PRINTABLE:'CN' stateOrProvinceName :PRINTABLE:'BJ' localityName :PRINTABLE:'BeiJing' organizationName :PRINTABLE:'example.com' organizationalUnitName:PRINTABLE:'www.example.com' commonName :PRINTABLE:'client' name :PRINTABLE:'EasyRSA' emailAddress :IA5STRING:'[email protected]' Certificate is to be certified until Jul 18 03:09:14 2025 GMT (3650 days) Sign the certificate? [y/n]:y 1 out of 1 certificate requests certified, commit? [y/n]y Write out database with 1 new entries Data Base Updated
（6.将四个所需文件复制到Open×××配置目录
[root@ShangHai-×××-1 2.0]# [root@oShangHai-×××-1 2.0]# cp keys/{dh2048.pem,ca.crt,server.crt,server.key} /etc/open***/
（7.修改server配置文件
[root@ShangHai-×××-1 2.0 ~]# egrep -v '^;|^#|^$' /etc/open***/server.conf #公网IP local 192.168.64.129 port 11194 proto tcp dev tun ca ca.crt cert server.crt key server.key # This file should be kept secret dh dh2048.pem #×××获取的IP网段 server 10.10.10.0 255.255.255.0 ifconfig-pool-persist ipp.txt #允许×××访问的本地私网网段 push "route 172.16.65.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" client-to-client duplicate-cn keepalive 10 120 comp-lzo max-clients 300 user nobody group nobody persist-key persist-tun status /var/log/open***-status.log log-append /var/log/open***.log verb 3 mute 10
（8.配置路由转发
[root@oShangHai-×××-1 2.0]# sed -i s'/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/' /etc/sysctl.conf
（9.配置防火墙开启端口并做NAT
[root@oShangHai-×××-1 2.0]# iptables -t nat -A POSTROUTING -s 10.10.10.0/24 -j SNAT --to-source 172.16.65.128 [root@oShangHai-×××-1 2.0]# iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 11194 -j ACCEPT [root@oShangHai-×××-1 2.0]# /etc/init.d/iptables save iptables：将防火墙规则保存到 /etc/sysconfig/iptables： [确定] [root@oShangHai-×××-1 2.0]# /etc/init.d/iptables restart iptables：将链设置为政策 ACCEPT：filter nat [确定] iptables：清除防火墙规则： [确定] iptables：正在卸载模块： [确定] iptables：应用防火墙规则： [确定]
（10.启动Open××× [如果启动失败,请查看日志]
[root@oShangHai-×××-1 2.0]# /etc/init.d/open*** start 正在启动 open***： [确定] [root@oShangHai-×××-1 2.0]# netstat -antup |grep open*** tcp 0 0 192.168.64.128:11194 0.0.0.0:* LISTEN 2419/open***
2、在Open×××-2 server上安装流程
（1.添加epel源
[root@ShangHai-×××-2 ~]# yum install epel-release
（2.安装Open×××
[root@ShangHai-×××-2 ~]# yum install open*** lzo-devel easy-rsa -y
（3.从Open×××-1 server上拷贝配置文件和证书密钥
[root@ShangHai-×××-2 ~]# scp -r 192.168.64.128:/etc/open***/* /etc/open***/
（4.修改server配置文件
[root@ShangHai-×××-1 2.0 ~]# egrep -v '^;|^#|^$' /etc/open***/server.conf #本机公网IP [和Open×××-1 server 有区别] local 192.168.64.129 port 11194 proto tcp dev tun ca ca.crt cert server.crt key server.key # This file should be kept secret dh dh2048.pem #×××获取的IP网段 [和Open×××-1 server 有区别] server 10.10.11.0 255.255.255.0 ifconfig-pool-persist ipp.txt #允许×××访问的本地私网网段 push "route 172.16.65.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" client-to-client duplicate-cn keepalive 10 120 comp-lzo max-clients 300 user nobody group nobody persist-key persist-tun status /var/log/open***-status.log log-append /var/log/open***.log verb 3 mute 10
（5.配置路由转发
[root@oShangHai-×××-2 ~]# sed -i s'/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/' /etc/sysctl.conf
（6.配置防火墙开启端口并做NAT [和Open×××-1 server 有区别]
[root@oShangHai-×××-2 ~]# iptables -t nat -A POSTROUTING -s 10.10.11.0/24 -j SNAT --to-source 172.16.65.129 [root@oShangHai-×××-2 ~]# iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 11194 -j ACCEPT [root@oShangHai-×××-2 ~]# /etc/init.d/iptables save iptables：将防火墙规则保存到 /etc/sysconfig/iptables： [确定] [root@oShangHai-×××-2 2.0]# /etc/init.d/iptables restart iptables：将链设置为政策 ACCEPT：filter nat [确定] iptables：清除防火墙规则： [确定] iptables：正在卸载模块： [确定] iptables：应用防火墙规则： [确定]
（8.启动Open××× [如果启动失败,请查看日志]
[root@ShangHai-×××-2 ~]# /etc/init.d/open*** start 正在启动 open***： [确定] [root@ShangHai-×××-2 ~]# netstat -antup |grep open*** tcp 0 0 192.168.64.129:11194 0.0.0.0:* LISTEN 2419/open***
3、安装Open××× client端
（1.添加epel源
[root@BeiJing-Client ~]# yum install epel-release
（2.安装Open×××
[root@BeiJing-Client ~]# yum install open*** lzo-devel easy-rsa -y
（3.复制client示例文件
[root@BeiJing-Client ~]# cp /usr/share/doc/open***-*/sample/sample-config-files/client.conf /etc/open***
（4.修改client配置文件
[root@BeiJing-Client ~]# egrep -v '^;|^#|^$' /etc/open***/client.conf client dev tun proto tcp #Open×××-1 server remote 192.168.64.128 11194 #Open×××-2 server remote 192.168.64.129 11194 resolv-retry infinite nobind persist-key persist-tun comp-lzo verb 3 ca ca.crt cert client.crt key client.key
（5.从Open××× server端拷贝client证书
[root@BeiJing-Client ~]# scp 192.168.64.128:/etc/open***/easy-rsa/2.0/keys/{ca.crt,client.crt,client.key} /etc/open***/
（6.启动Open××× Client
[root@ShangHai-×××-2 ~]# /etc/init.d/open*** start 正在启动 open***： [确定] #查看是否获取到IP [获取到的是Open×××-1 server的虚拟IP段] [root@BeiJing-Client ~]# ifconfig tun0 tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.10.10.6 P-t-P:10.10.10.5 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
（7.登录 Open×××-1 server 查看Open×××日志信息
[root@ShangHai-×××-1 network-scripts]# tail -f /var/log/open***.log Tue Jul 21 15:55:41 2015 192.168.64.138:52258 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key Tue Jul 21 15:55:41 2015 192.168.64.138:52258 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Jul 21 15:55:41 2015 192.168.64.138:52258 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 DHE-RSA-AES256-GCM-SHA384, 2048 bit RSA Tue Jul 21 15:55:41 2015 192.168.64.138:52258 [client] Peer Connection Initiated with [AF_INET]192.168.64.138:52258 Tue Jul 21 15:55:41 2015 client/192.168.64.138:52258 MULTI_sva: pool returned IPv4=10.10.10.6, IPv6=(Not enabled) Tue Jul 21 15:55:41 2015 client/192.168.64.138:52258 MULTI: Learn: 10.10.10.6 -> client/192.168.64.138:52258 #显示将10.10.10.6分配给192.168.64.138 client Tue Jul 21 15:55:41 2015 client/192.168.64.138:52258 MULTI: primary virtual IP for client/192.168.64.138:52258: 10.10.10.6 Tue Jul 21 15:55:43 2015 client/192.168.64.138:52258 PUSH: Received control message: 'PUSH_REQUEST' Tue Jul 21 15:55:43 2015 client/192.168.64.138:52258 send_push_reply(): safe_cap=940 Tue Jul 21 15:55:43 2015 client/192.168.64.138:52258 SENT CONTROL [client]: 'PUSH_REPLY,route 172.16.64.0 255.255.255.0,dhcp-option DNS 8.8.8.8,dhcp-option DNS 8.8.4.4,route 10.10.10.0 255.255.255.0,topology net30,ping 10,ping-restart 120,ifconfig 10.10.10.6 10.10.10.5' (status=1)
4、测试Open×××的连通性和Open×××的fuzaijun高可用性能
（1.获取到虚拟IP后，测试ping上海机房的内部server
（2.关闭Open×××-1 server
[root@ShangHai-×××-1 ~]# /etc/init.d/open*** stop 正在关闭open***： [确定] [root@ShangHai-×××-1 ~]# netstat -antup |grep open***
（3.查看Open×××-2 server Open×××日志信息
[root@ShangHai-×××-2 ~]# tail -f /var/log/open***.log Tue Jul 21 16:29:07 2015 192.168.64.138:40636 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key Tue Jul 21 16:29:07 2015 192.168.64.138:40636 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Jul 21 16:29:07 2015 192.168.64.138:40636 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 DHE-RSA-AES256-GCM-SHA384, 2048 bit RSA Tue Jul 21 16:29:07 2015 192.168.64.138:40636 [client] Peer Connection Initiated with [AF_INET]192.168.64.138:40636 Tue Jul 21 16:29:07 2015 client/192.168.64.138:40636 MULTI_sva: pool returned IPv4=10.10.11.6, IPv6=(Not enabled) Tue Jul 21 16:29:07 2015 client/192.168.64.138:40636 MULTI: Learn: 10.10.11.6 -> client/192.168.64.138:40636 #显示将10.10.11.6分配给192.168.64.138 client Tue Jul 21 16:29:07 2015 client/192.168.64.138:40636 MULTI: primary virtual IP for client/192.168.64.138:40636: 10.10.11.6 Tue Jul 21 16:29:09 2015 client/192.168.64.138:40636 PUSH: Received control message: 'PUSH_REQUEST' Tue Jul 21 16:29:09 2015 client/192.168.64.138:40636 send_push_reply(): safe_cap=940 Tue Jul 21 16:29:09 2015 client/192.168.64.138:40636 SENT CONTROL [client]: 'PUSH_REPLY,dhcp-option DNS 8.8.8.8,dhcp-option DNS 8.8.4.4,route 10.10.11.0 255.255.255.0,topology net30,ping 10,ping-restart 120,ifconfig 10.10.11.6 10.10.11.5' (status=1)
（4.查看是否获取新的IP，再次测试ping上海机房的内部server
至此,Open×××异地跨机房以及负载均衡高可用方案以构建完成，不足至此请大家指出，相互学习，共同进步。