openssl genrsa -des3 -out server.key 2048
生成server.key

openssl rsa -in server.key -out server.key
去除server.key 里面密码

openssl req -new -key server.key -out server.csr
生成server.csr

提交server.csr 内容到godaddy，审核后下载zip文件
把里面的非gd_bundled的文件和server.key 合并为pem

cat bf5d584ffa226fa6.crt server.key > /etc/nginx/server.pem
cp server.key /etc/nginx/server.key

nginx的配置里面这样写

ssl on;
ssl_certificate /etc/nginx/server.pem;
ssl_certificate_key /etc/nginx/server.key;