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For some reason “gpg –gen-key” still defaults to SHA1 and RSA2048, due to the known weaknesses of SHA1 it is probably a better idea to use SHA256. First of all, we need to create a configuration file. personal-digest-preferences SHA256 cert-digest-algo SHA256 default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed To generate a new key type (also specify to use RSA 4096): gpg --gen-key ### or gpg --full-generate-key Other useful commands are:

Apcupsd is a powerful daemon that can be used to manage APC UPS, add epel repositories and run: $ yum install apcupsd To configure apcupsd edit the following file: ## apcupsd.conf v1.1 ## # # for apcupsd release 3.14.14 (31 May 2016) - redhat # # "apcupsd" POSIX config file # # Note that the apcupsd daemon must be restarted in order for changes to # this configuration file to become active.

I have got my hands on an APC UPS and some HP gen8 server, installed apcupsd on CentOS 7, connected the USB cable and everything was working fine except for this very annoying issue I had: 1. power goes down (pull the UPS power cord). 2. after some minutes the UPS battery threshold is triggered and the server shutdown procedure is launched by apcupsd. 3. power goes back up (plug in the power cord) while the server is already shutting down but the shutdown sequence is not yet completed.

After upgrading my OpenVPN server to CentOS 7.5 I had trouble connecting to it. Specifically, I had two different issues: ** the laptop, which is running Fedora 28, was able to connect just fine but DNS resolution was broken. ** OpenVPN for Android was also connecting just fine but reporting a weird error: OpenVPN: tun tap invalid argument (code=22). The first one was caused by me because after the CentOS upgrade procedure was completed I also run yum autoremove which deleted dnsmasq; the solution was fairly simple, reinstall and reconfigure dnsmasq.

Since I am a real master at forgiving things I am writing this one down. PHP mail function relies on sendmail but SELinux by default block webservers from sending emails, the usual error that pop-out is: sendmail[16328]: NOQUEUE: SYSERR(nginx): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied Allow webservers to send email is as easy as editing the appropriate SELinux boolean: setsebool -P httpd_can_sendmail 1 Use “sestatus” to check SELinux booleans:

LineageOS in Android Oreo flavor is finally here, I guess it is time to update the guide I wrote a while back. Most of the stuff is exactly the same, for the sake of simplicity this guide will be pretty much a copy and paste of the old one with just some bits changed here and there. Required packages on Fedora are (rpmfusion repo must be previously installed): $ sudo dnf install screen java-1.

I normally move /home/user/Downloads off /home/user to a secondary mechanical drive and then symlink it back to /home/user. Firejail for security reasons does not allow whitelisting directories residing outside of the home directory, the simplest solution I found is mount Download directory using mount –bind. sudo mount --bind /mnt/data/Downloads/ /home/user/Downloads To make the change permanent edit fstab: /mnt/data/Downloads /home/user/Downloads none bind

Suunto makes some solid sport-watches, problem is that the management software is comprised of a closed source synchronization program (compatible with Windows and OSX only) and some cancerous cloud web interface accessible directly from their website. Even putting aside my personal aversion for closed source software, it is clear that this approach is retarded because an internet connection is required to be able to download any kind of data from the watch.

If I had to guess I would say that more than 90% of AMD Ryzen based builds use Single Rank memory sticks. Finding any information regarding how Dual Rank DDR4 perform, how they react to overclock or even worse, what memory settings are the best is pretty much mission impossible. Since I use Dual Rank DDR4, because, face it, it is 2017 and 16 GB of RAM does not cut it anymore, I had to dig in unexplored territories to find out what the best settings are.

LEDE, formerly OpenWRT, is a free open source Linux based operating system aimed at networking hardware. Every time the system is upgraded to a newer version using the so called “Sysupgrade BIN” image every package the user manually installed gets lost; this makes the upgrade process very tedious especially if one does not properly write down all the customization he has made. I don’t use many custom packages but QoS, USB support and vnstat are a must have.