MajorLinux
631d7e8bc5
Documents three lessons from the 2026-05-10 fleet outage where the Fedora half (majorhome, majorlab) had been silently failing to send notification mail for days: - Missing /etc/pki/tls/certs/ca-bundle.crt symlink (extracted bundle exists at /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem but the consumer-path symlink was lost during a ca-certificates package event). Diagnosis includes the cross-tool tell — dnf and curl break with the same path. Fix is a single ln -sfn. - Methodology: Fedora and majormail log postfix to journald; Debian and Ubuntu log to /var/log/mail.log. Querying the wrong source returns false negatives for healthy hosts. - Bounce-source addresses (Watchtower NOTIFICATION_EMAIL_FROM, fail2ban sender, root@<host>.localdomain) must resolve to real mailboxes — otherwise the first failed delivery generates bounce-of-bounce churn. Also promoting the article from untracked to committed; it had been authored on 2026-05-09 and not yet added to the repo. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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| cloud | ||
| dns-networking | ||
| docker | ||
| monitoring | ||
| reverse-proxy | ||
| security | ||
| services | ||
| storage-backup | ||
| index.md | ||