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Generate keypair

openssl genrsa -out dkim.server.com.key 2048 -outform PEM
openssl rsa -in dkim.server.com.key -out dkim.server.com.pem -pubout -outform PEM

Choose domain selector

Each key has assigned a label called domain selector. For domain server.com, selector will be i.e.: 20150726._domainkey.server.com

Example DNS entry will be: 

20150726._domainkey.server.com IN TXT "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC30aRx6rlDA7LkhsM1AtuW8LoBrjo6RZH3yS7nC9EgqV5ntFIzQyCo88hNBz72XwwFAAGKuCVIwcxV06lAHWnUTt+ZyjJlP/4XJo9JH76ZJu9vUTaHw753IY3SZR+xEnJuyBr/LZknAEFqHuDP7V3+B6SWuBElSFFnImnP7oeMQQIDAQAB"