Blog host_ Automatic renewal of free certificate

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

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An unexpected error occurred: UnicodeEncodeError: 'ascii' codec can't encode

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./certbot-auto certonly  -d *.example.cn --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory

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Requesting to rerun ./certbot-auto with root privileges...
./certbot-auto has insecure permissions!
To learn how to fix them, visit https://community.letsencrypt.org/t/certbot-auto-deployment-best-practices/91979/
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for example.cn

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NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
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(Y)es/(N)o: y

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Please deploy a DNS TXT record under the name
_acme-challenge.example.cn with the following value:

v8somjB6jyjkZ9-fi_5l705CA_ERu0hRJcGFbLpHNaQ# To configure dns Of txt analysis 

Before continuing, verify the record is deployed.
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Press Enter to Continue
Waiting for verification...
Cleaning up challenges
Subscribe to the EFF mailing list (email: xxxxx(your email)@163.com).

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/example.cn/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/example.cn/privkey.pem
   Your cert will expire on 2021-02-20. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again. To non-interactively renew *all* of your certificates, run
   "certbot-auto 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

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#  The domain name is the resolved secondary domain name 
 nslookup -q=txt _acme-challenge.example.cn

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(base) john@VM-0-3-ubuntu:~$ sudo ls -lh /etc/letsencrypt/live/example.cn
 Total usage  4.0K
lrwxrwxrwx 1 root root  33 Nov 22 16:25 cert.pem -> ../../archive/example.cn/cert1.pem
lrwxrwxrwx 1 root root  34 Nov 22 16:25 chain.pem -> ../../archive/example.cn/chain1.pem
lrwxrwxrwx 1 root root  38 Nov 22 16:25 fullchain.pem -> ../../archive/example.cn/fullchain1.pem
lrwxrwxrwx 1 root root  36 Nov 22 16:25 privkey.pem -> ../../archive/example.cn/privkey1.pem
-rw-r--r-- 1 root root 692 Nov 22 16:25 README

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server {
        listen       443 ssl;
        server_name  localhost;
        
        location / {
            root   html;
            index  index.html index.htm;
        }
        ssl on;
        ssl_session_timeout 5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
        ssl_prefer_server_ciphers on;
        ssl_certificate      /etc/letsencrypt/live/example.cn/fullchain.pem;#  If you use cert.pem Although the certificate is valid , But the browser still tells you it's not secure 
        ssl_certificate_key  /etc/letsencrypt/live/example.cn/privkey.pem;
}

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touch sslrenew.sh
chmod +x sslrenew.sh

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<path to certbot>/certbot-auto renew

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 Edit scheduled tasks ：crontab -e
0 0 1 * * /home/john/opt/sslrenew.sh # monthly 1 Japan 
 View scheduled tasks ：crontab -l