1. 安装certbot客户端

cd /usr/local/bin
wget https://dl.eff.org/certbot-auto
chmod a+x ./certbot-auto

2. 创建目录和配置nginx用于验证域名 

    mkdir -p /data/www/letsencryptserver {listen 80;server_name ~^(?<subdomain>.+).ninvfeng.com;location /.well-known/ {root /data/www/letsencrypt;allow all;}location / {return 301 https://$subdomain.ninvfeng.com$request_uri;}}

3. 生成证书

certbot-auto certonly --webroot -w /data/www/letsencrypt -d jianli.ninvfeng.com

 4. 配置nginx https

server {listen       443;server_name  jianli.ninvfeng.com;root /data/www/jianli;location / {index index.php index.html;}location ~ \.php$ {fastcgi_pass 127.0.0.1:9000;fastcgi_index index.php;fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;include fastcgi_params;}if (!-e $request_filename) {rewrite ^/(.*) /index.php?$1 last;}ssl on;ssl_certificate /etc/letsencrypt/live/jianli.ninvfeng.com/fullchain.pem;ssl_certificate_key /etc/letsencrypt/live/jianli.ninvfeng.com/privkey.pem;ssl_session_timeout  5m;ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;ssl_protocols TLSv1 TLSv1.1 TLSv1.2;ssl_prefer_server_ciphers   on;
}

该方法生成的证书有效期为90天, 在到期前我们需要执行以下命令更新证书

certbot-auto renew0 0 1 * * certbot-auto renew  --quiet --renew-hook "nginx -s reload"