xf.is blog

I’ve decided to migrate this blog to Hugo due to several reasons. hugo generates a static webpage so it removes the need for constant updates server side, such as MariaDB, PHP and WordPress itself.

Many types of malware and remote access trojans (RAT) today now use built-in Windows binaries to stage and infect computers.

At work I’m setting up a new syslog server and wanted the logs to be stored raw on disk (that is not compressed using gzip).

I recently purchased a MikroTik CRS309-1G-8S-IN router/switch and some generic SFP+ modules from FS.com (mix of 10GbE RJ45 and 850nm MMF modules) to upgrade my home network to 10 gigabit ethernet.

After doing a pfSense upgrade where the underlying base system has been upgraded like from 2.4.5p1 (FreeBSD 11.3) to 2.5.1 (FreeBSD 12.2) it is wise to upgrade the ZFS feature level.

When installing pfSense 2.5.0 on Seeedstudio Odyssey Blue J4105 I observed the following error message in the system buffer after I selected ZFS install: ahcich0: is 00000000 cs 00000000 ss 00000080 rs 00000080 tfd 50 serr 00000000 cmd 0000d117 (ada0:ahci…

At work we recently moved our DNS hosting to Azure DNS in order to simplify our hosting and benefiting from existing RBAC in Azure AD.

At work we are moving everything to Microsoft 365 and Azure AD and removing our on-premises environment.

Please note that many ACME clients only support Let’s Encrypt.

To run systemd timer jobs (cron) as a user you’ll need to create a systemd service folder as the user: mkdir -p ~/.config/systemd/user/ By default, systemd will only run timers if the user is logged in so to be able to run timer jobs without logged in use

There are couple of methods for haproxy to monitor what PostgreSQL instance is currently master so that “dumb” clients can always write to a PostgreSQL instance (instead of connecting to the standby node).

Took me a while to figure this one out in the netplan yaml syntax: network: version: 2 renderer: networkd ethernets: eno1: dhcp4: no dhcp6: no bridges: br20: dhcp4: no dhcp6: no interfaces: [ vlan20 ] ad…

Simple way to pipe cron script output to journalctl / syslog MAILTO="" * * * * * user (echo "testing") 2>&1 | logger -t tag-to-use gives following in journalctl $ journalctl SYSLOG_IDENTIFIER=tag-to-use -- Logs begin at Tue 2019-02-26 16:48:53 UTC, end at

When upgrading PostgreSQL cluster from one major version to another you cannot use pg_upgrade tool to upgrade/convert cluster with page checksums disabled to a cluster with page checksums enabled.

A small powershell snippet to show what CPU microcode revision is running and what microcode revision the BIOS provides.

Update: Following guide might not work since Predictive Failure Analysis (PFA) memory settingsare not working in Windows 10 2004 and 20H2 releases.