How to use OpenSSL to manage PKCS #12 archive

Use OpenSSL to manage PKCS #12 archive.

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SysOps

How to match certificate and its intermediate counterpart

Match certificate and its intermediate counterpart by using X.509 key identifier extension.

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SysOps

How to display and verify certificate chain for specific domain

Use openssl utility to display and verify the certificate chain for a specific domain.

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How to match certificate and its private key

Match certificate and its private key by comparing the modulus of the certificate to the modulus of the private key.

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SysOps

How to display TLS server extensions

Use openssl command-line utility to display TLS server extensions.

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How to determine if web-server still supports deprecated TLS 1.0 protocol

Use essential openssl utility to quickly determine if your web-server still supports deprecated TLS 1.0 protocol.

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How to monitor SSL certificates using icinga2

Create custom data field to define multiple domain names and service apply rule to verify those SSL certificates.

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SysOps

How to locally check SSL certificate

Check locally stored SSL certificate using essential utilities like openssl and curl. This knowledge is especially useful when you want to prepare an SSL certificate for a load balancer.

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SysOps

How to generate and decode CSR

Create a certificate signing request and use it to generate an SSL certificate. I strongly suggest reading my two earlier blog posts about self-signed SSL certificates and private keys as these contain useful information. I will describe three different ways to generate a certificate signing request.

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How to generate private key

Generate private key for an SSL certificate and verify its consistency.