How to create letsencrypt wildcard certificates

What’s Certbot?

Certbot is a free, open-source software tool for automatically using Let’s Encrypt certificates on manually-administrated websites to enable HTTPS.

Wildcard certificates

Let’s Encrypt supports wildcard certificate via ACMEv2 using the DNS-01 challenge.

It is necessary to add a TXT record specified by Certbot to the DNS server.

Caution: As it is necessary to update Let’s Encrypt’s certificate every 90 days, a new TXT record is required at every renewal.

 

Step 1: Run command

 

Step 2: Update DNS TXT record

 

After a successful verification

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