This article will show you how to generate a CSR request and get it signed on a linux CA (CentOS/Red Hat). Follow this link if you have not already installed and configured CA server. We can run the below command to generate the CSR (Certificate Signing Request).

# mkdir /tmp/certs
# openssl req -new -nodes -sha256 -out certificate_request.csr -newkey rsa:2048 -keyout /tmp/certs/certificate_key.key -extensions v3_req

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SED is a very powerful utility which allows find and replace/insert text functionality. It should be used with Caution and is recommended to use dry-run before committing the changes. Below are the various commands for text manipulation.

Note: \n = for newline and \t = for TAB space and For dry run just remove "-i" from the command

 Find the pattern and Insert text AFTER

# sed -i 's/.*search 1st Line.*/&\nInsert 2nd line/' file1

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When you come across this error "LDAP Error: Connect error: TLS error -8054:You are attempting to import a cert with the same issuer" enrolling a client to FreeIPA/IDM server, it means that the existing certificate does not match the one on the IDM server and can be fixed quite easily with just one command. The scenario in which this can happen is that you might have had the client enrolled to a different IDM server previously and the old cert is still lying around.

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