- DNS: ns1.etersoft.ru structure, zone files, nameservers
- NFS: servers, 16 groups workaround, FS-Cache setup
- Fail2ban: eterban integration with priv.etersoft.ru
- Proxmox: VM management, SPICE connection hints
- SSH: ALT Linux sshd_config path, StreamLocalBindUnlink
- Various admin workflow notes

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>