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With Apache it is possible to renew the SSL Certificate with the original CSR, however, most sites recommend creating a new CSR.
The key piece of information is that creating a Most sites can recommend creating a new CSR because creating a new certificate with an identical DN , the new key will not invalidate the previous keycertificate. This allows
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Openssl is a more straight forward and popular choice. Openssl will create one key at a time where as utilities such as IBM's ikeyman can create both in one step. The private key is needed to complete the CSR. When it comes time for renewal, you can use your existing private key to generate the CSR and public key OR generate a new one. There is no clear consensus on whether creating a new or using an old private key is considered best practice. It is not necessary to create a new private key depending on which web server you are using, (ie you'd need to create new private keys due to the way Microsoft IIS Web server handles storing private keys) but many sites like sslshopper.com recommend that a new private key be created as it avoids confusion and is simplest. |
Private Key
You can use your existing private key to generate the CSR or create a new one.
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There is no clear consensus on whether creating a new or using an old private key is considered best practice. It is not necessary to create a new private key depending on which web server you are using, (ie you'd need to create new private keys due to the way Microsoft IIS Web server handles storing private keys) but many sites like sslshopper.com recommend that a new private key be created as it avoids confusion and is simplest. |
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Duncan the sentence "It is not necessary to create a new private key depending on which web server you are using, (ie you'd need to create new private keys due to the way Microsoft IIS Web server handles storing private keys) but many sites like sslshopper.com recommend that a new private key be created as it avoids confusion and is simplest." does not make sense to me. We'll talk about it tomorrow. |
Condensed instructions are as follows:
Gather all required information from the existing certificate
Run openssl to generate a new server private key
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openssl genrsa -out www.example.com_server.key 2048
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Generate a CSR with the private key
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openssl req -new -key www.example.com_server.key -out www.example.com_server.csr
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Submit the CSR to your root CA to be signed.
Refer to to creating a new CSR for more details.