Previously, I got ssl certification by Let’s Encrypt. Now, I try to get wildcard certification.

I already installed certbot by yum. Run the following command.

certbot certonly --manual -d * -m <mail address> --agree-tos --manual-public-ip-logging-ok --preferred-challenges dns-01 --server

Waiting for a while…

Please deploy a DNS TXT record under the name with the following value:


Before continuing, verify the record is deployed.

the above message was shown and set the value on the DNS server. I use muumuu domain and write the value as follows.

After setting the value, push Enter. After a while, “Congratulations!” was shown and I was able to get ssl certification.

Very easy!

However, wildcard certification is not apply to the domain itself (if we get ssl for “*”, is excluded. Only sub domain is applied).

We can update the certification by certbot renew.

We can not use “certbot renew” to update the certification.



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