在Nginx上配置NameCheap免费SSL
4月底在NameCheap用优惠码注册了一个JunGeHost.com，并且免费赠送了一年的Positive SSL，于是顺便搞上SSL，这样传输数据也更加安全。SSL需要有一个独立IP，也就是一个独立IP只能对应一个SSL。（什么是SSL？）
一、准备工作
1、需要Nignx已经编译ssl 模块(lnmp一键安装包已经编译安装上)，如果没有需要重新编译，方法可以参考Nginx无缝升级。
2、再NameCheap已注册/转移域名或购买主机产品，且购买是在购物车上添加了免费SSL。
二、使用OpenSSL生成证书 (注：一下蓝色加粗字为执行时输入的命令！)
1、生成RSA密钥
li88-99:~# cd /usr/local/nginx/conf/
li88-99:/usr/local/nginx/conf# openssl genrsa -out jungehost.pem 2048
Generating RSA private key, 2048 bit long modulus
.....+++
.+++
e is 65537 (0x10001)
2、生成一个证书请求
li88-99:/usr/local/nginx/conf# openssl req -new -key jungehost.pem -out jungehost.csr
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.
现有 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 //输入国家简写
State or Province Name (full name) :ShanDong //省市
Locality Name (eg, city) []:JiNan //城市
Organization Name (eg, company) :JunGe Host //组织名称或公司名称
Organizational Unit Name (eg, section) []: //可以不用填
Common Name (eg, YOUR name) []:jungehost.com //输入要配置ssl的域名，如jungehost.com，注意jungehost.com 和www.jungehost.com 属于不同的域名。
Email Address []:admin@jungehost.com //输入邮箱
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []: //可以不用填
An optional company name []: //可以不用填
按上面的注释输入相关信息后，会在目录下面生成jungehost.csr这个文件，执行cat jungehost.csr
将下面以-----BEGIN CERTIFICATE REQUEST-----开头到-----END CERTIFICATE REQUEST-----结尾的全部内容复制下来。需要使用这个jungehost.csr去NameCheap生成数字证书。
li88-99:/usr/local/nginx/conf# cat jungehost.csr
-----BEGIN CERTIFICATE REQUEST-----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-----END CERTIFICATE REQUEST-----
三、NameCheap生成数字证书
1、登录NameCheap.com后，会在后台首页提示你有一个未激活的SSL认证产品，如下图：
点击上面的“SSL Certificates Page”链接。
2、激活SSL证书
页:
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