# \#linux
**URL:** https://hub.mender.io/tag/linux/152.md
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## [Port knocking three ways on Linux](https://hub.mender.io/t/port-knocking-three-ways-on-linux/8302)
**Author:** [@TheYoctoJester](https://hub.mender.io/u/TheYoctoJester)\
**Replies:** 0\
**Last updated:** [June 30, 2026, 3:51pm UTC](https://hub.mender.io/t/port-knocking-three-ways-on-linux/8302 "2026-06-30T15:51:40Z")
Introduction A service that is reachable is a service that can be attacked. The usual answer is authentication: let anyone connect, then prove they are allowed. Port knocking turns that around. The service is firewalled …
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## [Inspecting disk image partitions and contents on Linux](https://hub.mender.io/t/inspecting-disk-image-partitions-and-contents-on-linux/7951)
**Author:** [@TheYoctoJester](https://hub.mender.io/u/TheYoctoJester)\
**Replies:** 0\
**Last updated:** [August 8, 2025, 1:16pm UTC](https://hub.mender.io/t/inspecting-disk-image-partitions-and-contents-on-linux/7951 "2025-08-08T13:16:56Z")
Understanding the internal structure of disk images is essential for debugging conversions, verifying configurations, and troubleshooting boot issues. This tutorial demonstrates systematic approaches to analyze partition…
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## [Using ser2net to remotely access a serial terminal or port](https://hub.mender.io/t/using-ser2net-to-remotely-access-a-serial-terminal-or-port/7807)
**Author:** [@TheYoctoJester](https://hub.mender.io/u/TheYoctoJester)\
**Replies:** 0\
**Last updated:** [June 2, 2025, 11:20am UTC](https://hub.mender.io/t/using-ser2net-to-remotely-access-a-serial-terminal-or-port/7807 "2025-06-02T11:20:24Z")
In this tutorial, we will guide you through the process of setting up and using ser2net to remotely access a serial terminal on a Linux computer. This setup is particularly useful for managing embedded systems, IoT devic…
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## [How to get kernel build date on Raspberry Pi for mender integration checklist?](https://hub.mender.io/t/how-to-get-kernel-build-date-on-raspberry-pi-for-mender-integration-checklist/2826)
**Author:** [@Ks89](https://hub.mender.io/u/Ks89)\
**Replies:** 1\
**Last updated:** [November 13, 2020, 1:04pm UTC](https://hub.mender.io/t/how-to-get-kernel-build-date-on-raspberry-pi-for-mender-integration-checklist/2826 "2020-11-13T13:04:22Z")
I built a yocto image (dunfell) with u-boot and mender based on meta-raspberry. Everything was ok. In mender integration checklist I have to check kernel build date in both steps 12 and 16. However if I run cat /proc/v…