The Linux Guides category on Voxfor offers tutorials, tips, and in-depth guides for Linux users. It covers a range of topics from system administration and server management to troubleshooting common issues, making it a useful resource for both beginners and advanced users seeking to advance their Linux skills.
user:65534:rwx #effective:r-x is not contradictory output. The named user's ACL entry stores rwx, but the access ACL's mask::r-x caps that entry. For this user, the kernel applies a permission intersection: rwx AND r-x = r-x. Reading and execution can succeed while writing is denied.
That distinction matters because ...
Linux normally chooses a route from the destination address. Policy routing adds an earlier decision: the routing policy database, or RPDB, scans ordered rules and chooses which table should answer the lookup. That means a table can contain the right default route while a lower-numbered rule silently ...
qemu-img rebase and qemu-img commit can both shorten a QCOW2 backing chain, but they write in opposite directions. A safe rebase changes the top image so it can inherit from a different backing file without changing the guest-visible bytes. A commit changes a backing image by copying ...
An SMTP server can advertise STARTTLS, complete a TLS handshake, and still present an identity that a careful client must reject. Encryption only proves that a session became unreadable in transit. It does not, by itself, prove that the peer certificate chains to a trusted root, covers ...
A healthy DNS fallback is two observable transport events: the client receives a UDP reply with the TC (truncated) flag, then repeats the same question to the same server over TCP and receives the complete answer. A timeout by itself proves neither event. If TCP port 53 ...
chmod 777 changes one object's discretionary mode bits. Linux still checks the calling process identity, every directory in the pathname, any matching access-control-list entry, filesystem state, mount flags, security policy and the operation being attempted. A file can therefore display -rwxrwxrwx and still return Permission denied or ...
When a file disappears from an rsync --delete source, its absence becomes an instruction: remove the corresponding destination file. That is correct behavior for a mirror, but it can faithfully propagate a mistaken mount, a failed export, an overbroad exclude rule or a human deletion.
A safe run ...
A QCOW2 image has more than one meaningful size. Virtual size is the capacity visible to the guest, apparent file size is the file's logical length, and host allocation is the physical space consumed by the image. Deleting a guest file changes free space inside the filesystem, ...
You add a DNS record, confirm that the authoritative server returns it, and still see NXDOMAIN from the resolver used by your browser, server, or monitoring check. Both observations can be correct. The resolver may have cached an earlier negative answer and will not ask the authority ...
Restic can restore bytes correctly and still return the wrong recovery point. latest is a selector, not a business decision: a shared repository may contain snapshots from several hosts, paths, and jobs. Recovery starts by identifying the snapshot that represents the required state, restoring it beside live ...
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