Simple usage
./ca.sh
./server.sh my.domain.com
./client.sh my.cn
Customized
./ca.sh MyCA # saved to MyCA dir
./server.sh my.domain.com MyCA # saved to my.domain.com dir
./client.sh my.cn MyCA # saved to my.cn dir
Uses acme.sh. Requires access to DNS management to create a TXT record.
./letsencrypt.sh my.domain.com