Emil CHERICHES – computer passionate, electrician, handyman

Arch to Manjaro – the dirty way

July 24, 2024 Emil C

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In my lab I’ve been running arch on a NFS server and the filesystem used is ZFS. I think you already know that in Arch the zfs packages are located in AUR. There are several options like zfs-linux and zfs-dkms. Sadly both are problematic during kernel updates. One solution I…

The anatomy of a smart bulb

October 7, 2023 Emil C

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I’ve been having some troubles with Zigbee. Yes, at our airbnb we have a rather big dining room where I’ve put 7 Zigbee RGBWW Smart bulbs. The problem is that each time I try to turn all 7 on or off there’s either a lag or some of them just…

Smart Home firmware flashing OpenBeken OpenBK7231T Tuya

OpenVPN on 443

October 4, 2023 Emil C

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SSL VPN? Lately I’ve been working on a project where security is very important. In order to connect to the hosting provider I needed to use a specific VPN provided by FortiNet. What’s interesting about this VPN solution is that apparently it uses HTTPS. this gave me the idea to…

linux security HTTPS OpenVPN VPN

DokuWiki a simple solution to sorting documentation

July 6, 2020 Emil C

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In the IT world you can’t just remember everything you ever do, so you need a way to set a trail of what you do. Some people write journals and some (me included) write their documentation in a wiki. Wiki today means Wikipedia, Wikipedia runs MediaWiki software which is a…

Tips & Tricks Apache php

High Availability Load Balancer

August 12, 2015 Emil C

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Suppose you really need a highly available service. Normally you would put a load balancer in front of a server farm. But what happens when the load balancer fails? Well, we could have to load balancers, one which is actually active and the second one kicking in when first one…

linux Cluster High Availability VRRP

Chasing Ads

January 29, 2015 Emil C

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I hate ads. Don’t get me wrong, I understand why they’re here, I understand how the system works, I just hate when ads get in your way. For Chrismas, Santa and my Piggy Bank decided to make me have a Galaxy S5 Duos (Duos stands for Dual SIM). It all…

Phones & Tablets adb ADS Android

Quick TIP: Postfix Reverse lookup

October 31, 2014 Emil C

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When your maillog on a CentOS/*EL machine looks like this: mail postfix/smtpd[19345]: connect from unknown[XXX.YYY.ZZZ.QQQ]

Tips & Tricks CentOS Postfix

ClamAV Milter

September 16, 2014 Emil C

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CentOS 7 – still discovering it. ClamAV & ClamAV Milter related things have changed a bit.

Mail Server Series ClamAV Milter Postfix

Hosting a Virtual Machine With a Public IP (proxy_arp)

September 5, 2014 Emil C

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I run this website on a physical server that i rent. Recently I wanted to run on the same server a virtual machine, with a different OS, with a public IP address(I use KVM for that, as there’s nothing to really change on the physical server’s OS and performance-wise it’s…

linux CentOS KVM Proxy_ARP

follow the logs

August 29, 2014 Emil C

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Well, on a high-traffic mail server we need to follow the server log, to look for possible issues. The “tail -f” method might just not be as good as we would want, text is going up too fast and web just can’t read that fast. A solution to that is…

Tips & Tricks Postfix