使用EFF的Certbot为你的网站自动添加Let‘s Encrypt证书
在https快速普及的今天，有必要为我们http服务添加一层tls加密。这里我们使用免费的letsencrypt来签发https证书。以下粗略记录了在服务端配置的详细过程。
一、安装 Certbot
环境
这里采用的是安装CentOS 7.4的阿里云服务器，操作系统为CentOS 7.4,Web服务器软件为Nginx。
安装
yum -y install yum-utils
yum-config-manager --enable rhui-REGION-rhel-server-extras rhui-REGION-rhel-server-optional
sudo yum install certbot-nginx
然后使用以下命令自动安装并配置Nginx。
sudo certbot --nginx -d yourdomain.com
如果我们只想生成证书，手工配置nginx，则使用
sudo certbot --nginx certonly -d yourdomain.com
二、配置nginx
server {
listen 80;
listen [::]:80;
server_name yourdomain.com;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name yourdomain.com;
root /usr/share/nginx/html;
# certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
ssl_certificate /etc/letsencrypt/live/yourdomain.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/yourdomain.com/privkey.pem;
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;
# Diffie-Hellman parameter for DHE ciphersuites, recommended 2048 bits
#ssl_dhparam /path/to/dhparam.pem;
# intermediate configuration. tweak to your needs.
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
ssl_prefer_server_ciphers on;
# HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
add_header Strict-Transport-Security max-age=15768000;
# OCSP Stapling ---
# fetch OCSP records from URL in ssl_certificate and cache them
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8;
}
三、 证书自动续期
Let’s Encrypt申请的证书会有三个月的有效期，可以到期前手动续约。
使用certbot自带服务
systemctl start certbot-renew.service
systemctl start certbot-renew.timer
systemctl enable certbot-renew.timer
systemctl list-timers