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AnatomicJC

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AnatomicJC / ksmtuned.txt
Created September 11, 2019 12:51
Check is ksmtuned is efficient
$ 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
@AnatomicJC
AnatomicJC / letsencrypt-cerbot-wildcard.md
Last active September 12, 2019 19:02
Let's Encrypt wildcard docker OVH

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/*
@AnatomicJC
AnatomicJC / get-ssl-certificates-details.md
Created September 13, 2019 08:34
Get SSL certificate details with curl 
echo | openssl s_client -showcerts -servername doamin.ltd -connect domain.ltd:443 2>/dev/null | openssl x509 -inform pem -noout -text
@AnatomicJC
AnatomicJC / zfs-arc-memory.md
Created September 15, 2019 16:26
ZFS ARC Memory 
$ 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
@AnatomicJC
AnatomicJC / debug-gluster.md
Created September 20, 2019 14:28
debug gluster 
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
@AnatomicJC
AnatomicJC / debian_ksm.md
Created September 23, 2019 08:39 — forked from mapuo/debian_ksm.md
Enable KSM (Kernel Same-Page Merging) on boot in Debian

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:

  1. Install ksmtuned without all the QEMU dependencies:
@AnatomicJC
AnatomicJC / nfs-automount-with-systemd.md
Created October 30, 2019 09:55
NFS automount with systemd
@AnatomicJC
AnatomicJC / postgresql-read-only-user.md
Created March 3, 2020 14:02
PostgreSQL read-only user 
CREATE ROLE "ro-user" WITH PASSWORD 'secret';
ALTER ROLE "ro-user" WITH LOGIN;
GRANT USAGE ON SCHEMA public TO "ro-user";
GRANT SELECT ON ALL TABLES IN SCHEMA public TO "ro-user";
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO "ro-user";
@AnatomicJC
AnatomicJC / tmux-notes.md
Last active September 24, 2020 09:55
tmux powerline / mouse / cheat sheet

Powerline

# apt install powerline

$ cat ~/.tmux.conf 
source "/usr/share/powerline/bindings/tmux/powerline.conf"
set -g default-terminal "screen-256color"
@AnatomicJC
AnatomicJC / xfs-write-cache.md
Last active August 5, 2021 20:45
XFS write-cache

/etc/systemd/system/xfs-write-cache.service

[Unit]
Description=Set XFS Write cache to write through

[Service]
Type=oneshot
User=root
Group=root
ExecStart=/usr/lib/systemd/system-sleep/xfs-write-cache