# LinuxPizza

Personal notes and occasional posts

## 2020 is here, what's next?

#### ok, here it goes: the obligatory post that everyone writes in the beginning of a new year.

2019 was a year of progress for Linux.Pizza and growth, it has been fun to curate for the small “platform” and the userbase residing here.

2020 is here, and I'll try to summarize what we hope to achieve during this year:

• Build are more robust infrastructure: This is something that we started with last summer with OperationTulip (basically a hosted Nextcloud provider) and we will continue to do so during this year. I (Jonathan) is a part of the OperationTulip team and have contributed with alot of time and hardware into the project, so it is only fair that Linux.Pizza can reside in that environment too!

• Get more supporters: One of the blockers of many project is money and that is mostly storage and fees for domain names and such. We have been able to mitigate a big chunk of expenses by hosting our own authorive DNS-environment and getting a room in an already existing email server. As I mentioned in the 2019 recap we have gotten donation that have been covering the cost of operation for month – and we are not able to show enough gratitude for the generosity of the people that has donated to Linux.Pizza – Thank you!!

• Spread the word about the Librehosters: Linux.Pizza is a part of the Librehosters – a loose community of people and organizations that hosts and provide ethical and libre services for public use. We would really like to see it grow and more projects that joins the community

• Participate in real-life events: Altough I can't attend events like FOSDEM this year, we do hope that we can join the FOSS NORTH event this spring together with the team from OperationTulip. And who knows, we may have stickers for you then? ;)

• Linux.Pizza staff: Currently, when I am basically the sole admin of Linux.Pizza. Sure, my wife has full access to the services and will act if something would happend to me, but that's about it. So if you want to help out, or know someone that wants to help out – just contact me on Mastodon or Matrix (@j:matrix.linux.pizza).

Well, there is goes. Have a great day everybody!

## Linux.Pizza 2019 recap

#### 2019 has been a great year for Linux.Pizza, we have seen hundreds of new users on our Mastodon-instance, thousands of visitors on our trashmail service and hundreds of thousand of machines using our mirror

##### but sadly, due to lack of time and money, I have been forced to close down a few service like Pleroma, Social relay, & Invidious.

Linux.Pizza is one of many providers in the librehost network – everyone aims to offer ethical services that focus on privacy and fairness. 2019 has been a year of growth for the network and Linux.Pizza is not excluded.

Linux.Pizza was able to achieve the following:

2020 is approaching rapidly, and Linux.Pizza is ready! If you have any suggestions of services that you would like to see, please let us know! We are always exploring ways extend our list of services that is beneficial to our users!

In your haproxy.cfg, you should do this:

global
log /dev/log local0 notice
user haproxy
group haproxy
stats socket /var/run/haproxy.sock mode 660 level admin
defaults
log global
retries 2
timeout connect 3000
timeout server 5000
timeout client 5000
listen galera
bind /var/run/mysqld/mysqld.sock mode 666
option mysql-check user HAPROXY
balance first
server galera1 192.168.20.21:3306 check maxconn 64
server galera2 192.168.20.22:3306 check maxconn 64
server galera3 192.168.20.23:3306 check maxconn 64


And why do I listen on a socket? That is because an application will assume that mysql/mariadb are listening on a socket when you specify “localhost” by default.

## Expanding RAM on a Linux system without rebooting

#### This assumes that you are running your Linuxsystem as a virtual server on VMWare, KVM, XEN or AHV.

We have been there a couple of times – your application need more RAM. Or just want more RAM in order to have your Minecraft server run smoothly.

2. Second, we need to tell the kernel that there is more RAM available for use, we can do that by using this simple script:

for f in /sys/devices/system/memory/memory*/state ; do grep -v -q online $f || continue echo -n "Bringing$f online... " echo online > $f || continue echo OK done  That's all! You can now verify with your favorite way to check RAM usage. ## Expanding the drive on a live Linux system #### This assumes that you are running your Linuxsystem as a virtual server on VMWare, KVM, XEN or AHV. #### Be sure to take a backup first! It is quite common – for me atleast – that a busy databaseserver is going to use more and more space. And in most cases it is not always that attractive to have to restart the server and resize it with a LiveCD such as gparted live. Luckily, there is possible to expand the partitions while your machine is running. I will try to guide you with this step to step guide on how you can successfully proceed with it: 1. First of all, add the storage in you hypervisor. 2. Next, you want to tell the kernel that to rescan the bulk device: echo 1 > /sys/class/block/sda/device/rescan fdisk are now able to “see” the expanded disk, in this case /dev/sda 3. Now, we need to do the actual expansion of the partinion, so we need to “delete” the partion and add it again via fdisk – dont worry, we are not going to write the changes to disk while the partinion is deleted: fdisk /dev/sda 4. Just to make sure, check the partinion by selecting p, if the disk looks like it should, you may continue 5. Delete the partition by pressing d 6. Press n to create a new partinion 7. Press p to chose “Primary Partition” 8. Press 1 to chose the partition number 1 9. Press ENTERtwice 10. And lastly, doublecheck the changes by pressing p, note the difference from the first time you did it. You should see that the partition has been expanded. 11. !The following actions will write the changes to disk! Now, in order to make is real, press w in order to write the changes to disk, you will see a warning about that the partition table has been changed. Do not worry, it is expected. ##### LVM If you are utilizing LVM, do the following: pvresize /dev/sda lvextend -r -l +100%FREE /dev/mapper/LVM 12. Now, run partprobe (you have to install parted for this to work). If you are using an older kernel, you maybe would need to reboot if the partprobe task did not work. 13. Now, we just need to expand the filesystem itself in order to actually use the newly added space: resize2fs -p /dev/sda1 Verify with df -h You should be able to see the new size now. ## Adding more CPU-cores without rebooting you Linux-server #### This assumes that you are running your Linuxsystem as a virtual server on VMWare, KVM, XEN or AHV with CPU Hotplug enabled. From time to time, I have been in need of extra CPU-power for various reasons. It might be that someone suddenly got alot of traffic to their PHP-based website, or they want to add more containers but loosing the time and uptime that comes with a reboot it not an option. Luckily, there is solutions for that! 1. First of all, add the cores to your VM via your hypervisor. 2. Second, we need to tell the kernel that there is more cores available for use, we can do that by using this simple script: for f in /sys/devices/system/cpu/cpu*/online ; do grep -v -q 0$f || continue echo -n "Bringing $f online... " echo 1 >$f || continue echo OK done

1. Done, you can now verify that you have added more cores to your system.

## A relative small event that defined my life

#### It is almost 18 years since I first came in contact with Linux, and I did not know at all what kind of journey it would take me on.

I was 9 years old at the time, when me and my brother got our first PC. It was an Fujitsu-Siemens with 128MB of RAM, Pentium II 233 MHZ and a HDD with amazing 8GB space. SuSE 7.0 was installed on that machine and we loved it. Although at the time, we only used Linux so we can brag to our friends that “we didn't use Windows”. That part kind of failed because our friends did'nt even know what Windows was and my brother and I thought that was absurd that our friends was so “informed about something so essential in life”.

At school, I loved to just “click around” and find stuff. Schools in the 90's/early 2000 did not consider “security” as something prioritized = more fun for us kids.

Today, I mainly work with Linux and basically almost every hobby that I have has something to do with Linux.

It is amazing how such a small event as getting a PC with Linux could alter the course of my life.

## Gab, and the fediverse

### Why I decided to block gab.[com|ai], and some other thoughts.

##### It has not gone unoticed, but gab – the plattform that champions “free speechs” has joined the fediverse. Why? Because probably (hopefully) they are running out of money.

4th of July, 2019 – gab did enter the fediverse with glory and might. Users loved it and the software was great!

No it was'nt. People hated it and complained everywhere over the extremely bad performance and the unreliable service. I enjoyed the show, it was great because it means that gab is loosing money when the deploy did not work well. gab also uses cloudflare

The funny thing aside for a moment, and lets focus on the dangerous and evil side of gab. Gab claims to be a champion of free speech, sadly this has turned into a harbor of extremist – actual Nazis.

I decided to create an account on the platform to observe it myself. I did not have to scroll much to be greeted with this:

More:

And more: This was presented to me withing the first minute.

So much for the All are welcome slogan.

You maybe wonder – why does a platform allow content that celebrates genocide, fascism , violence, hate, and authoritarian governments and hides it in the free speech bucket? I do not know, I honestly do not know. The founder of gab – Andrew Torba – is even a proclaimed christian. Is'nt christianity supposed to be the opposite of the content that is spreading on gab?

This is why I have suspended gab on my instance. And if you as an admin does it – great! But it would also be great if people could federate with them to be able to ridicule them (or as some people calls it – virtual milk-shaking).

We can't let history repeat itself.

Note: I do publish social.linux.pizza's blocklist here

## The homelab

#### Since I was a little kid I've always had a love for computes. Later on, that love transformed to a love for servers – hence that's why I got myself a tiny homelab.

Currently, the homelab is rocking the following setup: One Proliant Microserver G8 8TB disk, 8GB RAM, simple celeron CPU, 10Gbit Network running Debian 9. Currently using this as a shared storage (iSCSI) between my to hypervisors. I had two of those before, but I gave one away.

One homebuild server with an SuperMicro X9SCI/X9SCA motherboard, Xeon E3-1240 V2, 32GB RAM and 4TB storage (mostly ZFS with alot of SSD cache) Currently running Proxmox in a HA-environment

One homebuild PC that was repurposed into a server. ASRock H61 Pro BTC motherboard, Intel i5-2400, 16GB RAM and 1,1 TB of ZFS with SSD-cache storage. Also running Proxmox in a HA-environment

An EdgeRouter X-SFP (serving the secondary connection”

Three MikroTik Switches – RouterBOARD 260GS, 260GSP & CSS326-24G-2S+RM.

A Meraki accesspoint

This is the hardware my environment utilizes. I am running Pfsense in a virtual environment instead of using the Edgerouter as the main router. The reason is that I wanted a more advanced firewall than the EdgeRouter on my “main” connection. And the reason that I run pfsense in a virtual machine is because I want the ability to easily restore backups in case if something goes wrong – which pfsense often do when I upgrade for some reason.

I hope that I can get a newer server in the coming month so I can replace my ASRock “server” and convert that one to a router instead – hopefully.

## Fediverse?

#### You probably came here because some friend of you mentioned “fediverse” to you, while you responded – fediverse? what is that?.

And your friend did not really wanted to explain it, so you was sent here instead.

Great! I will try my best into explaining what the “Fediverse” is, and how it might save your digital life.

The Fediverse is a name of a network of tens of thousands connected servers, consisting of many different kind of software that “speaks” to each other. The most popular software is Mastodon, that basically is a Twitter clone. The big difference is that the code that is being used on the server is publicly available to everyone, so that ensures that the code is secure and does not hide any hidden “feature” such as data collection on a massive scale, such as Twitter.

Mastodon is developed by many, but the leader and founder of the project is Eugen “Gargron” Rochko that wanted to create a social network because he was tired of having his friends and family being on different networks. And if he wanted to keep in touch with he had to create account on different places (MySpace, Twitter, Viber, Telegram and so on). And so Mastodon was born.

Today, there is thousands of Mastodon servers up and running, each one with it's own characteristic, culture, rules and people. Servers for those who love beer, cats, politics, Linux or just being social. Most of the servers is connected to each other. Yes, you can join that super-niche server that focuses exclusively on cats with moustaches, while still connecting to your friends who is on that instance about helicopters – is'nt that awesome?

Or, if you just want to listen to someone explain how it works, here is a Peertube (which is also a fediverse compatible piece of software) video explaining how it works