If you need wildcard certificate from Let's Encrypt for your domain, you can use certbot to do it.
First of all, you should have access to your dns to create TXT records like this
_acme-challenge.domain.com IN TXT "some_value"
Second - install certbot
yum install -y certbot
then make a request like this:
certbot certonly --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory --manual-public-ip-logging-ok -d '*.domain.com' -d domain.com
During a dialog, you will receive wich TXT record you should put in your DNS
First of all, you should have access to your dns to create TXT records like this
_acme-challenge.domain.com IN TXT "some_value"
Second - install certbot
yum install -y certbot
then make a request like this:
certbot certonly --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory --manual-public-ip-logging-ok -d '*.domain.com' -d domain.com
During a dialog, you will receive wich TXT record you should put in your DNS