安裝 Let’s Encrypt 工具

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sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install certbot

設定 nginx config

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location /.well-known {
    alias /var/www/example.org/.well-known;
}

建立會用到的目錄

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sudo mkdir -p /var/www/example.org/.well-known

產生憑證

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sudo certbot certonly --webroot -w /var/www/example.org/ -d example.org

結果

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IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/example.org/fullchain.pem. Your cert will
   expire on 2017-08-30. To obtain a new or tweaked version of this
   certificate in the future, simply run certbot again. To
   non-interactively renew *all* of your certificates, run "certbot
   renew"
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

nginx with ssl and HTTP/2 範例

/etc/nginx/snippets/ssl-params.conf

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# from https://cipherli.st/
# and https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_ecdh_curve secp384r1;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;
# disable HSTS header for now
#add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
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# HTTP - redirect all requests to HTTPS:
server {
    listen 80;
    listen [::]:80;
    return 301 https://$server_name$request_uri;
}

# HTTPS - proxy requests on to local Node.js app:
server {
    # 啟用 ssl 與 http2
    listen 443 ssl http2;

    # 同時啟用 IPv6 的 ssl 與 http2
    listen [::]:443 ssl http2;

    server_name your_domain_name;

    ssl_certificate /etc/letsencrypt/live/your_domain_name/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/your_domain_name/privkey.pem;

    include snippets/ssl-params.conf;

    # Pass requests for / to localhost:8080:
    location / {
        proxy_pass http://localhost:8080/;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_ssl_session_reuse off;
        proxy_set_header Host $http_host;
        proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
    }
}

編輯 crontab

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sudo crontab -e

新增

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45 8 * * * /usr/bin/certbot renew --renew-hook "/bin/systemctl reload nginx" >> /var/log/certbot-renew.log

參考連結

refs.