With Huawei Enterprise Access points you have different firmware versions for different deployment scenarios. A FIT version for when you have an Wireless Access Controller (AC). This AC will managed all your AP and you have metrics available from within the AC. Huawei also offers a FAT version of the firmware for the AP. This is an standalone verion and there is no central management and overview of your AP’s with the FAT version. ...

Recently I got my hands on a nice all flash storage from Huawei, the Dorado 5000. Off course I wanted to see if my Grafana dashboard I created for the Huawei Oceanstor series was also working on the Dorado, most is working, but some mibs are different and not all performance metrics that are availble on the Oceanstor are on the Dorado. So I adjusted the Telegraf and Grafana dashboard to work correclty with the Dorado. ...

This plugin/script for Telegraf will collect the metrics from LizardFS and stores it into InfluxDB, then you can view your metrics in Grafana on a templated dashboard.

With hackers around every corner, governments wants to read your emails, now a days encryption is a necessity. Now most major sites are only available on https, and more and more IM are using encryption. But what about and old protocol email that is still very popular and we cant go without it any more. How can we increase security for this? Of course you can use S/MIME or PGP and have end to end encryption, but the problem that in transit between mail servers the from, to, cc, and subject fields are not encrypted. For this we can use Transport Layer Security (TLS) encryption between the smtp servers. Now in June 2018 from Google’s perspective 89% outbound mails and 88% inbound mails are using encryption. ...

After I logged into Snorby to check some events on our IDS. I notice that one of my sensors didn’t return any events any more into the database. I log in the sensors and I notice that Barnyard2 wasn’t running any more. Barnyard2 parses the Snort logs and inserts the min the database. So I started the service again and after a few minutes it stoped running again. Upon inspection of the logs I fount this warning. So the data doesn’t fit in the column. ...

I manage a couple of storages at work. I got a few Huawei OceanStor storages. v2 as wel v3 storages. There is some commercial tooling from Huawei available to gather metrics, but that didn’t fit my needs. I found out that all or almost all metrics that I need are available via SNMP. So it was not hard to setup a Grafana dashboard with all metrics. Pre install Make sure you have installed InfluxDB as the time-series database Telegraf as the collector first. ...

A couple of weeks ago I discover zswap. zswap is a Linux kernel feature that provides a compressed write-back cache for swapped pages, as a form of virtual memory compression. Instead of moving memory pages to a swap device when they are to be swapped out, zswap performs their compression and then stores them into a memory pool dynamically allocated in the system RAM. Later writeback to the actual swap device is deferred or even completely avoided, resulting in a significantly reduced I/O for Linux systems that require swapping; the tradeoff is the need for additional CPU cycles to perform the compression. ...

Just for fun, try to play music with old floppy drives and an Arduino.

I created a Arduino controled led clock with 60 rgb led’s. This one is inspired by the Equinox Clock from Bram Knaapen. LED strip For the 60 RGB leds I use a string of RGB leds that I order directly from China, each of those leds has a LPD6803 IC. A arduino library for this string can be found at adafruit’s github. Time Keeping For time keeping I am using a a RTC DS1307 that is connected via I2C to pin A4 and A5 on the Arduino. Pin 7 from the DS1307 is connected to pin D2 on the Arduino an is set to a 1Hz Square Wave. I am using this to give the Arduino every second a interrupt, this made the timing a lot easier. I build the DS1307 on a custom should with breakout pins. ...

Found an old magnetic card reader. I hooked it up to an Arduino to read magnetic cards.