https://e-mc2.net/ Recent content in Home on Hugo en Mon, 09 Oct 2023 00:00:00 +0000 https://e-mc2.net/presentation/dataops-sikker-oktober/ Mon, 09 Oct 2023 00:00:00 +0000 https://e-mc2.net/presentation/dataops-sikker-oktober/ Sikker Oktober (Safe October) at the University of Oslo is organized every year in connection with the National Security Month from NORSIS (Norwegian Center for Information Security). The purpose is to increase engagement, awareness, and knowledge about digital security, both among the public and in organizations https://e-mc2.net/blog/ups-nut-pfsense-zabbix/ Sat, 05 Aug 2023 00:00:00 +0000 https://e-mc2.net/blog/ups-nut-pfsense-zabbix/ In this article I am going to explain how I got control of my UPS (Uninterruptible Power Supply) installation using NUT via PFSense+ so I can monitor and manage the UPS from the main router in my HomeLab. In addition I will show how I have configured Zabbix with a new NUT template for monitoring, alarm generation and long term metrics for my UPS. https://e-mc2.net/homelab/office/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/office/ I needed a place to have the HomeLab and my own Home Office/Lab. After all, they sent us to work from home and couldn&rsquo;t go to the office or school for months because of the COVID pandemic. https://e-mc2.net/homelab/intro/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/intro/ <p>After years of working within IT and having a very simple infrastructure at home, I decided to invest in some equipment in 2020 so I could have a proper infrastructure and my own HomeLab. What triggered this decision was probably de COVID pandemic, the extra free time I had to expend at home and the months my family and I had to spent working/studing from home.</p> <p>After several weeks reading, thinking and planning, I started building and realizing this project and in these pages you have information about the process, the components, why they were chosen and how they are used.</p> https://e-mc2.net/homelab/kvm-server/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/kvm-server/ The Linux KVM server is one of the central components in the HomeLab. The server was going to run KVM and all the virtual machines in my HomeLab so I spent some time trying to find out a good balance between number og CPU cores, memory size and fast storage before I decided what I needed. https://e-mc2.net/homelab/network/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/network/ One of the main components in a HomeLab is the network infrastructure. https://e-mc2.net/homelab/rack-cabinet/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/rack-cabinet/ A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is 19 inches (482.6 mm) wide. https://e-mc2.net/homelab/ups/ Sat, 08 Apr 2023 00:00:00 +0000 https://e-mc2.net/homelab/ups/ One of the components one should have in a HomeLab is an UPS (Uninterruptible Power Supply). An UPS will protect your HomeLab when the input power source or mains power fails, giving you time to save your data/work and shutdown your HomeLab without data lost or data corruption. https://e-mc2.net/blog/openai-speech-recognition/ Tue, 28 Feb 2023 00:00:00 +0000 https://e-mc2.net/blog/openai-speech-recognition/ Will OpenAI/Whisper recognized my “Andalusian accent” when I speak Spanish and transcribe the audio to text without problems? I had to use 0.032759 kWh of energi to find this out. https://e-mc2.net/blog/openzfs-on-ubuntu/ Thu, 15 Dec 2022 00:00:00 +0000 https://e-mc2.net/blog/openzfs-on-ubuntu/ Is OpenZFS as good as its reputation says? In this article I install and test OpenZFS on Linux and see how it replaces my hardware RAID5 installation. https://e-mc2.net/blog/megaraid-sas-9341-8i-not-working-with-linux/ Wed, 13 Apr 2022 00:00:00 +0000 https://e-mc2.net/blog/megaraid-sas-9341-8i-not-working-with-linux/ <p>Not long ago I got some nice second-hand SAS drives that I could use with my home server. I didn&rsquo;t have a SAS controller that I could use with these drives at that time, so I started looking for one. I didn&rsquo;t want to spend too much money and the specifications I wanted were not very advanced.</p> <p>After some investigation I decided to purchase a Broadcom MegaRaid SAS 9341-8i controller. This controller is a bit old but it had the functionality I was looking for at an affordable price.</p> https://e-mc2.net/presentation/behind-scenes-elk-system/ Fri, 17 Jan 2020 00:00:00 +0000 https://e-mc2.net/presentation/behind-scenes-elk-system/ Have you ever wondered how to manage billions of logs and metrics from thousands of devices in your infrastructure? If you need high-availability and a resilient and stable system to process your data this is the tutorial for you. https://e-mc2.net/blog/elasticsearch-garbage-collection-hell/ Thu, 30 May 2019 00:00:00 +0000 https://e-mc2.net/blog/elasticsearch-garbage-collection-hell/ After several weeks of intense testing, fixing configuration problems, re-indexing data and experiencing problems when upgrading our Kibana indices, we managed to upgrade our 36 Kibana instances and our Elasticsearch cluster in production from version 5.6.16 to 6.7.1 a couple of weeks ago. https://e-mc2.net/blog/keepalived-documentation-nightmare/ Tue, 06 Mar 2018 00:00:00 +0000 https://e-mc2.net/blog/keepalived-documentation-nightmare/ I am writing this article with contradictory feelings, Am I having a bad day on top of The Oracle at Google not giving me answers, or is the documentation of the Keepalived software totally outdated and old? https://e-mc2.net/presentation/zabbix-devops-environment/ Fri, 15 Sep 2017 00:00:00 +0000 https://e-mc2.net/presentation/zabbix-devops-environment/ A case study about how the University of Oslo uses Zabbix in a DEVOPS environment where changes happen fast and no one can have control of everything. https://e-mc2.net/blog/elasticsearch-common-maintenance-tasks/ Mon, 10 Jul 2017 00:00:00 +0000 https://e-mc2.net/blog/elasticsearch-common-maintenance-tasks/ If you have to administrate an Elasticsearch cluster, there are some common maintenance tasks that you will have to run to keep your data growth under control, backup your indexes and keep the cluster updated. https://e-mc2.net/blog/access-elasticsearch-cerebro-sslldap/ Sun, 25 Jun 2017 00:00:00 +0000 https://e-mc2.net/blog/access-elasticsearch-cerebro-sslldap/ &ldquo;CEREBRO&rdquo; is an Elasticsearch web admin tool built using Scala, Play Framework, AngularJS and Bootstrap. It is equivalent to KOPF with some extra new features. https://e-mc2.net/blog/using-zabbix-postgresql-database-backend/ Mon, 19 Jun 2017 00:00:00 +0000 https://e-mc2.net/blog/using-zabbix-postgresql-database-backend/ We started using Zabbix to monitor the IT infrastructure at The University of Oslo in 2014. During all this time we have been running all our Zabbix servers on VMware virtual servers with an acceptable level of performance. This situation changed some months ago when the VMvare+Storage we were using did not have more available resources for us to grow and it was slowing down the future development of our monitoring system. https://e-mc2.net/presentation/zabbix-automation-uio/ Tue, 02 May 2017 00:00:00 +0000 https://e-mc2.net/presentation/zabbix-automation-uio/ A short presentation focused on how we automate the Zabbix configuration at the Universitity of Oslo https://e-mc2.net/presentation/lightning-talk-zabbix-cli/ Sat, 10 Sep 2016 00:00:00 +0000 https://e-mc2.net/presentation/lightning-talk-zabbix-cli/ A 5 minuttes lightning talk to present Zabbix-CLI. https://e-mc2.net/presentation/zabbix-uio/ Sat, 10 Sep 2016 00:00:00 +0000 https://e-mc2.net/presentation/zabbix-uio/ A case study showing the problems we have resolved with Zabbix and the challenges we had when we implemented Zabbix as the main monitoring tool at the University of Oslo. https://e-mc2.net/presentation/postgresql-backup-manager/ Thu, 29 Oct 2015 00:00:00 +0000 https://e-mc2.net/presentation/postgresql-backup-manager/ A 5 minuttes lightning talk to present PgBackMan. https://e-mc2.net/projects/zabbix-cli/ Thu, 09 Oct 2014 00:00:00 +0000 https://e-mc2.net/projects/zabbix-cli/ Zabbix-cli is a tool for managing some administration tasks in monitoring systems running Zabbix. It is a terminal client written in Python that uses the Zabbix-API to connect to your Zabbix installation. https://e-mc2.net/projects/pgbackman/ Sun, 12 Jan 2014 00:00:00 +0000 https://e-mc2.net/projects/pgbackman/ PgBackMan is a tool for managing PostgreSQL logical backups created with pg_dump and pg_dumpall. It is designed to manage backups from thousands of databases running in multiple PostgreSQL nodes, and it supports a multiple backup server topology. https://e-mc2.net/projects/postgresql.org/ Mon, 20 Apr 2009 00:00:00 +0000 https://e-mc2.net/projects/postgresql.org/ The PostgreSQL-ES project was a website about PostgreSQL in Spanish that was active between April 2009 and June 2017. For a long period of time It was the website of reference in spanish for the PostgreSQL database. https://e-mc2.net/presentation/postgresql-what-makes-database-so-powerful/ Tue, 08 Apr 2008 00:00:00 +0000 https://e-mc2.net/presentation/postgresql-what-makes-database-so-powerful/ A general presentation about PostgreSQL database for the GoOpen2008 conference in Oslo. https://e-mc2.net/presentation/postgresql-most-advanced-database-world/ Thu, 13 Oct 2005 00:00:00 +0000 https://e-mc2.net/presentation/postgresql-most-advanced-database-world/ An extended presentation about PostgreSQL, the history of the project, features, administration and the most important tuning parameters. https://e-mc2.net/projects/linux-es.org/ Wed, 28 Oct 1998 00:00:00 +0000 https://e-mc2.net/projects/linux-es.org/ The Linux-ES project, also known as &ldquo;The Linux Corner&rdquo; was inaugurated in 1998 and was one of the first websites about Linux in Spanish. https://e-mc2.net/contact/ Mon, 01 Jan 0001 00:00:00 +0000 https://e-mc2.net/contact/ Name: Rafael Martinez Guerrero Email: rafael@e-mc2.net / rafael@3.14159.tech Web: https://e-mc2.net/ RSS: https://e-mc2.net/index.xml Social Mastodon LinkedIn GitHub Flickr Twitter PGP-keys rafael@e-mc2.net -----BEGIN PGP PUBLIC KEY BLOCK----- xjMEYg0c+xYJKwYBBAHaRw8BAQdAMTmDpwlgM7hFEKRVzqjT6zMsKTiOA9Xd 4Ig495zlaGjNI3JhZmFlbEBlLW1jMi5uZXQgPHJhZmFlbEBlLW1jMi5uZXQ+ wo8EEBYKACAFAmINHPsGCwkHCAMCBBUICgIEFgIBAAIZAQIbAwIeAQAhCRDO zIcgdVhnHRYhBFvmLX8ltUbOLOHdCs7MhyB1WGcd3WYBAJ6OWCiaiU0YxrWn o1a7YcQz7FQITnBtU+bSenf399qmAP0fQQJD2dbMTIIKMjM8RCyUGaaYFhJe Rvxsb0hag8HSD844BGINHPsSCisGAQQBl1UBBQEBB0CYq0U0GLrvtMkGUjEG KnugcZg6/LFcr1b0I1l23kZHEQMBCAfCeAQYFggACQUCYg0c+wIbDAAhCRDO zIcgdVhnHRYhBFvmLX8ltUbOLOHdCs7MhyB1WGcdBOwA/RCjZ6FJ8GJ2x8XZ hVGxDloc4wlU4iXcjo0LNTsR5uIpAPwMgbRX3CqIDTMp2+yHBl83L8TrRTX4 vB0o5Z70SPiKDA== =nSxv -----END PGP PUBLIC KEY BLOCK----- rafael@3.14159.tech -----BEGIN PGP PUBLIC KEY BLOCK----- xjMEYg9qdxYJKwYBBAHaRw8BAQdAtlARRRk7ironBpd1S+d2HIvhlxEw+PSh URJAJYiUHUvNKXJhZmFlbEAzLjE0MTU5LnRlY2ggPHJhZmFlbEAzLjE0MTU5 LnRlY2g+wo8EEBYKACAFAmIPancGCwkHCAMCBBUICgIEFgIBAAIZAQIbAwIe AQAhCRAtdiHLBdbzPBYhBJJfeYndr/H4WLJdGS12IcsF1vM8K58A/0Fv3o7+ b2leAAPR84bmzB4XVMBohOpHuC+7dvtcLtOvAQCWN6auOLTpSq2RlvT+kAsS dtxWnBF4ttiTf9esNu7KC844BGIPancSCisGAQQBl1UBBQEBB0Dn/W3tlB9U N/D/S7e7I/ejj53llqE8vO6e6mNlpfSMSAMBCAfCeAQYFggACQUCYg9qdwIb DAAhCRAtdiHLBdbzPBYhBJJfeYndr/H4WLJdGS12IcsF1vM8u2gA/15kR3ye I5MByWo3sckNHEqW33Cv2s5fMxc/BtAzxOv/AP4ms+rfummfNFoZrpr7mf41 zQlPb459bVxcyEwWwGB+AQ== =CbOL -----END PGP PUBLIC KEY BLOCK-----