The problem: I have a Mac keyboard where the Alt/Win (i.e. Option/Command) keys are inverted compared to a regular PC keyboard, and I’d like to swap them. The answer: [codesyntax lang=”bash”] # clear all options setxkbmap -model “pc105” -layout “us,se” -option “” # set the Apple keyboard setxkbmap -rules “evdev” -model “pc105” -layout “us,se” -option … Continue reading Swap Alt and Windows keys with xmodmap?
If you need to perform real-time ALTER TABLE processes on MySQL (InnoDB, TokuDB) tables, a great tool for the job is the Percona Toolkit. The Percona Toolkit includes a utility (pt-online-schema-change) to perform such a process, without write-locking tables, or having to manually create a temporary table and triggers to synchronize the data during the … Continue reading Alter mysql tables on the fly, without locking them
Purpose This article describes a way to use a Groovy script to remove old builds from all jobs up to a set number. In other words, you set how many of the latest builds to keep and run it on the Jenkins Master to cleanup all previous builds for all jobs. This script includes Cloudbees … Continue reading Remove Old Job Builds on Jenkins with Groovy Script
This is only to remember what I did to migrate from InnoDB to TokuDB on a MariaDB cluster. TokuDB settings are specific to my environment, so please don’t ask me what/how/why. root@dbrfoo:~# mysql -u root -p MariaDB [(none)]> INSTALL SONAME ‘ha_tokudb’; Query OK, 0 rows affected (0.07 sec) MariaDB [(none)]> show engines; +——————–+———+—————————————————————————-+————–+——+————+ | Engine … Continue reading MariaDB 10.0: How to migrate from InnoDB to TokuDB
After upgrading the kernel to 4.8.13-1-ARCH some of the vmware kernel modules failed to compile: /tmp/modconfig-6BT70S/vmmon-only/linux/hostif.c:1592:47: error: ‘NR_ANON_PAGES’ undeclared (first use in this function) /tmp/modconfig-BBuLH6/vmnet-only/netif.c:468:7: error: ‘struct net_device’ has no member named ‘trans_start’; did you mean ‘mem_start’? The fix: [codesyntax lang=”bash”] cd /usr/lib/vmware/modules/source tar xf vmnet.tar tar xf vmmon.tar mv vmnet.tar vmnet.old.tar mv vmmon.tar vmmon.old.tar sed … Continue reading VMware modules, Arch Linux & kernel 4.8.13
Disclaimer: I am writing this post mostly for me to remember how and what I did to solve wrong field mapping in elasticsearch. Quote from Elasticsearch Dynamic Mapping documentation page When Elasticsearch encounters a previously unknown field in a document, it uses dynamic mapping to determine the datatype for the field and automatically adds the … Continue reading Custom Elasticsearch template with custom field mapping
Usually I am using the packages from the official repositories. However, sometimes it’s necessary to use a newer version, I recently had to do this with strongswan and I’m sharing the procedure for other people to try. Get the build dependencies [codesyntax lang=”bash”] apt-get update apt-get install devscripts fakeroot apt-get build-dep strongswan [/codesyntax] Obtain and build … Continue reading Build strongswan v5.5.0 debian package — with debug symbols
Last week I had to install my new work computer. Although I am a Debian guy, I thought I should give a chance to Arch Linux as well. In theory full disk encryption and Linux is not a big deal (there’s a lot of documentation out there) and it should be pretty straight forward. In practice, … Continue reading Full Disk Encryption on Arch Linux: NVMe, GRUB2, LVM and LUKS
Disclaimer: at some point I found this page describing how to delete duplicate e-mail messages with mutt. Unfortunately the page is not up anymore (HTTP 404) and I took the liberty to post it on my blog. Anyway, credit goes to Marianne Promberger. The original page was here: http://promberger.info/linux/2008/03/31/mutt-delete-duplicate-e-mail-messages/ Here we go: Sometimes, if you consolidate different … Continue reading Mutt: delete duplicate e-mail messages
Ever happened to be focused on something and miss the fact that your laptop is running out of battery? And to lose your work? Yesterday happened twice! “Really? Hmm… I need to fix this as soon as possible.” I googled a bit and this stackexchange post popped up. Nice, great! But being notified even when you’re … Continue reading Be notified when critical battery level is reached