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Create a swap file on Linux

March 26, 2025 · admin Unix Ubuntu Linux Raspberry PI MAC OS X Raspbian

The simple following steps will create a swap file. Swap files are used when the operating system need more memory. It uses the swap space as memory. Its usage shall be limited, since a swap space is less efficient than memory. It will save you a memory upgrade if it is need seldomly.

What performance to expect using a Raspberry Pi as a firewall?

October 2, 2021 · admin Raspberry PI Raspbian RaspberryPI Router Firewall

I've tested 3 different Raspberry Pi used as firewalls at measured the performance I was getting. The Raspberry Pis are:

hwclock: ioctl(RTC_RD_TIME) to /dev/rtc to read the time failed: Invalid argument

May 1, 2016 · admin Raspberry PI ARPI600 Raspbian

This error occurred on Raspbian Jessie using an ARPI600. I was trying to set up the real-time clock. I could resolve the issue by running the following command: hwclock --systohc -D --noadjfile --utc after enabling it with the command echo pcf8563 0x51 > /sys/class/i2c-adapter/i2c-1/new_device 0x51 may differs on you installation. Run i2cdetect -y 1 to find the right value.

Create a swap file on Linux

What performance to expect using a Raspberry Pi as a firewall?

hwclock: ioctl(RTC_RD_TIME) to /dev/rtc to read the time failed: Invalid argument

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