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Running an SSH service usually lets you try both password and key authentication. Most of the time key‑only is the safer bet, but you might want to enforce it only for a handful of high‑privilege accounts—developers, sysadmins, or anyone who needs to keep a tight grip on the machine. OpenSSH’s Match directive makes that a breeze without touching the global defaults.
Open the daemon configuration:
[Read More]A running DHCP server can generate thousands of “client request” and “lease granted” messages every hour. On busy networks this inflates /var/log/syslog to 10 k lines a day, making it hard to spot genuine errors and bloating disk usage. The service must stay online, so the goal is to silence the noise without turning the daemon off.
Disabling dhcpd or dhcp-server removes the spam but also removes the ability to hand out IPs. In a homelab or small office you may have a separate DHCP server (e.g., a router) that you can stop, but in many setups the Linux box is the sole DHCP provider. The logs are useful for troubleshooting mis‑configurations, but the volume is excessive.
If you’re sharing a directory between a handful of people, the first thing most folks do is chmod 777. I’ve seen that go wrong when a rogue script deletes everything. ACLs let you fine‑tune permissions per user or group while keeping the directory’s ownership sane.
Below is a step‑by‑step guide that shows how to enable ACLs, set up a shared folder, and maintain it securely on a modern Linux system (kernel 6.x, systemd 250+). The examples use setfacl and getfacl, the standard ACL utilities that ship with most distributions.
Shared download directories are a staple in home labs, small‑business servers, and even personal media stacks. The temptation to give everyone write access with chmod 777 is strong: it feels quick, it works, and it seems harmless. In practice, it opens a door for accidental deletion, privilege escalation, and data corruption. The Linux ACL subsystem is a lightweight, kernel‑level solution that lets you grant fine‑grained permissions without abandoning the familiar chmod/chown workflow.
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Rootkit detection tools are the unsung heroes of a hardened Linux box.
Even when you’ve got signed binaries, SELinux/AppArmor, and a hardened kernel, a bad actor can still sneak in a compromised binary or a hidden process.
rkhunter (Rootkit Hunter) does the heavy lifting: it scans for known rootkits, flags suspicious binaries, and watches for odd system changes.
It’s lightweight, runs in user space, and you can drop it into a cron job without pulling in a full‑blown IDS.
The aim here is to show how to run rkhunter nightly and get an e‑mail only when something actually needs your attention.
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Systemd’s journal is a reliable source of operational data, but raw journalctl output is hard to sift through at scale. Loki, Grafana’s log aggregation system, can ingest journal entries and expose them through Grafana dashboards. The setup below runs entirely on a single Debian‑based home‑lab server, uses Docker Compose for simplicity, and keeps security tight by running services with the least privilege needed.
I’m happy to help polish the post, but I’ll need the full article text to make sure I keep all the technical details, links, commands, and the final TAGS line intact. Could you paste the rest of the article (or let me know where it’s located) so I can rewrite it in the style you’re looking for?
I’d be happy to help polish the piece, but I need the original article text to work from. Could you paste it here?