https://nobe4.fr/tags/go/Recent content in Go on nobe4Hugoen-us<a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA</a>Sat, 27 Jun 2026 12:13:35 +0200https://nobe4.fr/posts/when-go-user.lookup-fails/Thu, 11 Jun 2026 00:00:00 +0000https://nobe4.fr/posts/when-go-user.lookup-fails/<p>A Docker base image bump turned into a multi-day debug of Go&rsquo;s <code>os/user</code> package, NSS, SSSD, LDAP and GLIBC ABI. Here is what happened and what I learned.</p> <p>Throughout this post, <code>alice</code> is an admin account with a hardcoded entry in <code>/etc/passwd</code>, and <code>bob</code> is a regular user who only exists in the central LDAP directory. All details of <code>/bin/client</code> are fictitious for the purpose of this post.</p> <h2 id="how-it-started-glibc-errors">How it started: GLIBC errors</h2> <p>After deploying a routine docker update, users started seeing errors:</p>