Choosing a specific cipher to use for SSH can have a large performance impact when transferring files using tools that use SSH as a transport. For testing, I decided to benchmark the impact of using scp with various ciphers locally on my laptop as well as a VPS from Linode. […]
Read moreThe wp-cron.php script for WordPress handles various scheduled events (such as checking for updates, publishing scheduled posts and more). By default this will be executed at each page load (to check if anything needs to be done). A common recommendation is to disable this and instead run it as a […]
Read moreAt the time of writing, the Linode Longview agent is not working with MariaDB 10.5 onwards. This happens because there is a hard coded binary name in the Perl script responsible for determining if MySQL monitoring is required; from MariaDB 10.5 the binary name has changed from mysqld to mariadbd. […]
Read moreFor convenience I like to name the interfaces for my desktop/laptop in an easy to remember convention so that I don’t need to think about what the interface names are at all when running things like tcpdump. The best way I have found to do this is with udev rules. […]
Read moreThe KDE Plasma Thermal Monitor widget has an annoying issue where the temperature sources will sometimes show as “Off” after rebooting. This seems to have broken around Ubuntu Groovy for me. This is a well known issue as referenced on the KDE forum among other places. To fix, I edited […]
Read moreping6 can be used on Linux hosts to ping the “allhosts” address, ff02::1. If you try running ping6 ff02::1 with no arguments you will get an error like connect: Invalid argument, instead you must provide the interface to ping from with the -I argument. As an example, to ping all […]
Read moreThese are some common commands that are used when managing LVM devices. Volume Groups Create a volume group: vgcreate vg0 /dev/sda3 [/dev/sdb /dev/sdc /dev/sdd …] Logical Volumes Create a LV: lvcreate -n LV-NAME -L 30G VG-NAME Delete a LV: lvremove -n LV-NAME VG-NAME
Read moreThese are some common PostgreSQL commands for things that I need to remember. Opening session This assumes linux authentication (default for Debian Linux). Run the psql command as the postgres user: Open a database with \c DBNAME: Showing Table Info Use \dt to show table information (same as show tables; […]
Read morePart of a standard server setup for me includes installing SNMPD for remote monitoring of hosts. A simple SNMPD configuration template can be found below. You will need to change these variables: COM_NAME: This should be the community name that your SNMP poller users when connecting to the host. PREFIX: […]
Read moreBy default, the Ubiquiti Unifi controller runs on port 8443 for inbound HTTPS requests to the web interface. I instead wanted to change this to listen on the standard HTTPS port (443) and I wanted my own valid SSL to be used to access the web interface. The easiest way […]
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