==== CentOS 6 ====
  - 建立 /root/lets-encrypt/authenticator.sh<code sh>
cd /root/lets-encrypt/
wget https://svn.ichiayi.com/opensvn/opentrysoft/certbot/authenticator.sh
chmod a+x authenticator.sh
</code>
  - 建立 /root/lets-encrypt/cleanup.sh<code sh>
cd /root/lets-encrypt/
wget https://svn.ichiayi.com/opensvn/opentrysoft/certbot/cleanup.sh
chmod a+x cleanup.sh</code>
  - 取得 CloudFlare 的 Zone ID 與 Global API Key 更改 authenticator.sh 與 cleanup.sh 內容<file>
:
API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
EMAIL="xxx@xxx.xxx"
ZONE_ID="xxxxxxxxxxxxxxx"
:
</file>++看 CloudFlare 取得 Zone ID / Global API Key 畫面| {{:tech:2019031501.png}} \\ {{:tech:2019031502.png}} \\ {{:tech:2019031503.png}} \\ {{:tech:2019031504.png}} \\ {{:tech:2019031505.png}}++
  - 執行取得 SSL 憑證命令 Exp. erp.ichiayi.com <code sh>
/root/lets-encrypt/certbot-auto certonly --manual --preferred-challenges=dns --manual-auth-hook /root/lets-encrypt/authenticator.sh --manual-cleanup-hook /root/lets-encrypt/cleanup.sh -d erp.ichiayi.com
</code>
  * 設定憑證到期自動更新
    - 建立 /root/lets-encrypt/renewcert.sh Exp. erp.ichiayi.com <code sh>
vi /root/lets-encrypt/renewcert.sh</code><file>
/root/lets-encrypt/certbot-auto renew --preferred-challenges=dns --manual-auth-hook /root/lets-encrypt/authenticator.sh --manual-cleanup-hook /root/lets-encrypt/cleanup.sh --agree-tos
</file>
    - 設定執行權限<code sh>
chmod a+x /root/lets-encrypt/renewcert.sh
</code>
    - 設定每天 4:30 執行自動檢查一次<code sh>
vi /etc/crontab
</code><file>
:
# erp.ichiayi.com SSL cert auto renew
30 4 * * * root /root/lets-encrypt/renewcert.sh > /tmp/certrenew.log
</file><code sh>
service crond restart
</code>