![]() If you see these lines then use the instructions for the PEM form otherwise it is most likely a DER certificate. How to recognize the form?Ī PEM-formatted certificate is human-readable in base64 format, and starts with the lines -BEGIN CERTIFICATE. $ sudo openssl x509 -inform der -outform pem -in r -out local-ca.crtĪfter this point you can use Ubuntu’s tools like curl and wget to connect to local sites. ![]() $ sudo apt-get install -y ca-certificates Installing a certificate in DER formĪssuming the DER-formatted root CA certificate is in r follow the steps below to install it. crt extension on the file, otherwise it will not be processed.Īfter this point you can use Ubuntu’s tools like curl and wget to connect to local sites. $ sudo cp local-ca.crt /usr/local/share/ca-certificates Assuming the root CA certificate is in PEM form at a file called local-ca.crt, follow the steps below to convert to DER form an install. To install a certificate in the trust store it must be in PEM form. For an Ubuntu server to be functional and trust the hosts in this environment this CA must be installed in Ubuntu’s trust store. Often in an enterprise environments there is a local Certificate Authority (CA) that issues certificates local to the organization. Installing a root CA certificate in the trust store
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