Category Archives: Servers

News and issues relating to server side technology.

How to change the SSH server port on Ubuntu?

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To change the port of the SSH server, the systemd configuration for ssh.socket must be changed or supplemented. The configuration adjustment is made by creating a *.conf file in the directory /etc/systemd/system/ssh.socket.d/ (if the directory does not exist, create it with the root user).

Source: How to change the SSH server port on Ubuntu? – Server Fault

JFC!

Needed to configure ssh to listen on a different port on a new Ubuntu server 24.04. Have done this many times before editing ssh_config. But this time nothing happened. The server wasn’t accepting the change. Googled and googled all night until I found out that systemd took over the god damned opening of ports away from openssh config.

I have other Ubuntu 24.04 installations that don’t do this so this is new and finding this new systemd fuck up hasn’t propagated the search engines. 14 year old answers don’t cut it anymore.

Still pissed off even though this site fixed the problem. Systemd sucks!

Had to get this off my chest.

NextCry Ransomware Targets NextCloud Linux Servers and Remains Undetected Features

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This statement provides insight into how hackers may have been able to access his system. On October 24, NextCloud disclosed a remote code execution vulnerability (CVE-2019-11043) which has been exploited to compromise servers with the default Nextcloud NGINX configuration.

Source: NextCry Ransomware Targets NextCloud Linux Servers and Remains Undetected Features

Linux Foundation exec believes edge computing will be more important than cloud computing

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When Joshipura is talking about edge computing, he means compute and storage resources that are five to 20 milliseconds away. He also means edge computing should be an open, interoperable framework. This framework should be independent of hardware, silicon, cloud, or operating system. Open-edge computing should also work with any edge-computing use case: Internet of Things (IoT) edge, a telecom edge, cloud edge, or enterprise edge, whatever, “Our goal here is to unify all of these.”

Source: Linux Foundation exec believes edge computing will be more important than cloud computing | ZDNet

To make this happen, Joshipura announced two more projects were being incorporated into LF Edge: Baetyl and Fledge.

Raspberry Pi 4 on sale now from $35

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Raspberry Pi 4 Model B

Here are the highlights:

  • A 1.5GHz quad-core 64-bit ARM Cortex-A72 CPU (~3× performance)
  • 1GB, 2GB, or 4GB of LPDDR4 SDRAM
  • Full-throughput Gigabit Ethernet
  • Dual-band 802.11ac wireless networking
  • Bluetooth 5.0
  • Two USB 3.0 and two USB 2.0 ports
  • Dual monitor support, at resolutions up to 4K
  • VideoCore VI graphics, supporting OpenGL ES 3.x
  • 4Kp60 hardware decode of HEVC video
  • Complete compatibility with earlier Raspberry Pi products

Source: Raspberry Pi 4 on sale now from $35 – Raspberry Pi

Google’s Tensor Processing Unit could advance Moore’s Law 7 years into the future

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“We’ve been running TPUs inside our data centers for more than a year, and have found them to deliver an order of magnitude better-optimized performance per watt for machine learning. This is roughly equivalent to fast-forwarding technology about seven years into the future (three generations of Moore’s Law),” the blog said. “TPU is tailored to machine learning applications, allowing the chip to be more tolerant of reduced computational precision, which means it requires fewer transistors per operation. Because of this, we can squeeze more operations per second into the silicon, use more sophisticated and powerful machine learning models, and apply these models more quickly, so users get more intelligent results more rapidly.”

Source: Google’s Tensor Processing Unit could advance Moore’s Law 7 years into the future | PCWorld

How I Hacked Facebook, and Found Someone’s Backdoor Script

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Here I’d like to explain some common security problems found in large corporations during pentesting by giving an example.

Source: How I Hacked Facebook, and Found Someone’s Backdoor Script | DEVCORE 戴夫寇爾

A brief summary, the hacker created a proxy on the credential page to log the credentials of Facebook employees. These logged passwords were stored under web directory for the hacker to use WGET every once in a while

What’s the best way to check if a volume is mounted in a Bash script?

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What’s the best way to check if a volume is mounted in a Bash script? What I’d really like is a method that I can use like this: if <something is mounted at /mnt/foo> then <Do some

Source: What’s the best way to check if a volume is mounted in a Bash script?

Avoid using /etc/mtab because it may be inconsistent.

Avoid piping mount because it needn’t be that complicated.

Simply:

if grep -qs '/mnt/foo' /proc/mounts; then
    echo "It's mounted."
else
    echo "It's not mounted."
fi

HTTP is obsolete. It’s time for the distributed, permanent web

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IPFS is still in the alpha stages of development, so we’re calling this an experiment for now. It hasn’t replaced our existing site storage (yet). Like with any complex new technology, there’s a lot of improvements to make. But IPFS isn’t vaporware, it works right now. You can try it out on your own computer, and already can use it to help us serve and persist Neocities sites.

Source: HTTP is obsolete. It’s time for the distributed, permanent web