When the RAM runs out, the computer becomes very slow as it accesses the swap file on the hard drive. To solve this problem, the zswap module was invented. By default, it is disabled in the Linux operating system, but you can enable it.

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For diagnostic purposes, I have boot-time messages enabled in /etc/default/grub (line GRUB_CMDLINE_LINUX=""
).
When starting a computer running Linux Mint 19.2, errors like FAILED Failed to start AppArmor are visible. The problem started after reinstalling the MySQL service to manage relational databases. The solution to the "Failed to start AppArmor" problem is given below...

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Due to the accessibility of the balcony at my place of stay, I decided to install the Ground Plane antenna on all amateur bands 7-28 MHz, and, if I can tune it, then on 3.6 MHz. The design from the article was taken as a basis http://www.dk3red.homepage.t-online.de/de/s15_01.htm. The antenna is a fishing rod with wire wound around it, a tuner at the base, grounded on the railing or glazing frame of the balcony.

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Previously, about 10-15 years ago, our whole family went on vacation to the islands near Vyborg, using Vysotsk as an intermediate point for transferring by boat to the Ostrovok recreation center. Now we don’t go to the base, because... she has owner changed. Therefore, I decided to visit the city of Vysotsk itself to remember how it was, just like that.

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In a TP-Link network router ("router") with OpenWrt firmware, it was necessary to block the MAC address of the network device on the local network so that the device would not have access to the Internet.

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Task: upload photos via Wi-Fi from a smartphone to a personal computer running Linux.

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Full moon August 1-3, 2020.

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In a large network with DHCP enabled, intrusions sometimes occur - third-party connections.
They need to be tracked. It is convenient to take pictures of the network - before and after.
In the article I talk about two ways to compile a list of computers (a network snapshot) - using nmap and arp-scan.

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On July 22, 2020, a rainbow shone over St. Petersburg.

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After several years of using the Yaesu VX-6r portable transceiver, it developed an unpleasant drawback - quiet modulation in the 144 MHz range. Symptoms - at the repeater’s “round table” the presenter could not make out the call sign, and when answering a regular call, the correspondents ran away in fear with the words “sorry, I can’t receive you, see you later.” 😏 The reason for this is the reduced modulation level, which appears as a quiet and unintelligible signal.

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