https://lead-devops.blackdevhub.online/en/tags/openssl/Recent content in Openssl on Lead DevOpsHugoen-USSun, 06 Sep 2026 00:00:00 +0000https://lead-devops.blackdevhub.online/en/posts/openssl-check-tls-certificates/Sun, 06 Sep 2026 00:00:00 +0000https://lead-devops.blackdevhub.online/en/posts/openssl-check-tls-certificates/<p>Certificates expiring on prod at the worst moment — a familiar story. OpenSSL answers TLS certificate questions faster than any marketplace checker. Here are the key scenarios without the fluff.</p> <h2 id="basic-certificate-parsing">Basic Certificate Parsing </h2> <p>The first command for any diagnostics is the text dump:</p> <div class="td-code td-code--untitled" id="td-code-63c22da9-fence-0" data-td-code data-td-code-auto-id data-td-language="bash" data-td-line-count="1"> <div class="td-code__viewport" id="td-code-63c22da9-fence-0-viewport" data-td-code-viewport><div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">openssl x509 -text -noout -in cert.pem</span></span></code></pre></div></div> </div> <p>Output shows Subject, Issuer, validity dates, signature algorithm, and public key. For a quick summary without the wall of text:</p>