AnatomicJC

Create a dedicated ZFS docker pool with deduplication disabled in case of dedup enabled on your system:

zfs create -o mountpoint=/var/lib/docker -o dedup=off rpool/docker

Sometimes, you don't want ZFS for docker storage. ZFS can be sadly quite painful with Docker in Docker and similar scenarios. It might be best to avoid the problem by creating a volume in your ZFS pool, formatting that volume to ext4, and having docker use "overlay2" on top of that, instead of "zfs".

zfs create -s -V 30G rpool/docker

mkfs.ext4 /dev/zvol/rpool/docker

Go to https://api.ovh.com/console/ and create a new API key with these rights (replace domain.ltd with your domain managed at OVH):

GET /domain/zone/
GET /domain/zone/domain.ltd/status
GET /domain/zone/domain.ltd/record
GET /domain/zone/domain.ltd/record/*
POST /domain/zone/domain.ltd/record
POST /domain/zone/domain.ltd/refresh
DELETE /domain/zone/domain.ltd/record/*

echo | openssl s_client -showcerts -servername doamin.ltd -connect domain.ltd:443 2>/dev/null | openssl x509 -inform pem -noout -text

$ cat /proc/spl/kstat/zfs/arcstats |grep c_
c_min                           4    536870912
c_max                           4    2147483648

cat /etc/modprobe.d/zfs.conf
# https://www.google.com/search?q=bit+calculator Bit > GigaBit
# Min 512MB / Max 2048 MB Limit

gluster volume set nextcloud-data performance.cache-size 1GB
gluster volume set nextcloud-data performance.client-io-threads on
gluster volume set nextcloud-data performance.io-cache on
gluster volume set nextcloud-data performance.io-thread-count 16
gluster volume set nextcloud-data performance.readdir-ahead enable
gluster volume set nextcloud-data performance.read-ahead disable
gluster volume set nextcloud-data features.cache-invalidation on
gluster volume set nextcloud-data features.cache-invalidation-timeout 600
gluster volume set nextcloud-data performance.stat-prefetch on

Enable KSM (Kernel Same-Page Merging) on boot in Debian

I have installed and running Netdata on my Debian based home server and I wanted to enable KSM after Netdata installer suggested it cloud save some RAM.

To enable the KSM on boot in Debian you I executed these steps:

Install ksmtuned without all the QEMU dependencies:

Backup android app, data included, no root needed, with adb

Note: This gist may be outdated, thanks to all contributors in comments.

adb is the Android CLI tool with which you can interact with your android device, from your PC

You must enable developer mode (tap 7 times on the build version in parameters) and install adb on your PC.

Don't hesitate to read comments, there is useful tips, thanks guys for this !

Powerline

# apt install powerline

$ cat ~/.tmux.conf 
source "/usr/share/powerline/bindings/tmux/powerline.conf"
set -g default-terminal "screen-256color"

@_ip_serveur:/chemin/vers/partage /mnt/<nom_partage>/	nfs4	x-systemd.automount,x-systemd.idle-timeout=300,async	0 0

https://doc.fedora-fr.org/wiki/Partage_de_disques_en_r%C3%A9seau_avec_NFS#Montage_automatique_.C3.A0_la_demande_avec_timeout_via_fstab_et_x-systemd

	$ grep -H '' /sys/kernel/mm/ksm/pages_*
	/sys/kernel/mm/ksm/pages_shared:69
	/sys/kernel/mm/ksm/pages_sharing:1085
	/sys/kernel/mm/ksm/pages_to_scan:100
	/sys/kernel/mm/ksm/pages_unshared:81
	/sys/kernel/mm/ksm/pages_volatile:158263