Convert SSL certificate from CRT format to PEM

Q. Ubuntu 8.04 is setup by default to accept PEM certificates instead of CRT, is there any way to convert it?

A. You can convert the SSL certificates using the following commands:

openssl x509 -in server.crt -out server.der -outform DER

and:

openssl x509 -in server.der -inform DER -out server.pem -outform PEM

Once done, you will get something like that:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

You should add your private key at the top, so the file looks like this:

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Replace apache.pem with that file and restart apache.