Can we fulfil our internal CA requirement using keytool?

Hi
Thank you for reading my post.
is it possible for us to fulfil all of our requirement to test SSL stuff using keytool?
for now what i can do is:
create a key
import/export it into cert / csr (pem)
Why we need to provide the csr to a CA to sign it for us?
Does it really required to send a CSR to a CA to sign it for us?
1-Cant we create a CA certification usin keytool, import it into our trust_store?
if we can do 1 then we can simply sign our CSR ourself and it make our life easier.
Is there any tool that can help us do this?
Thanks.

If you want to trust a server, its certificate or that of one of its signers needs to be in your truststore. Conversely, if you want the server to trust you, your cert or that of one of its signers needs to be in the server's truststore. As you are talking about a self-signed certificate that means the cert itself must be in the server's truststore. If it's a Java server it can be put there with keytool -import, after you've exported it from your keystore with keytool -export.

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