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# for hdd
device=sata4; sudo sh -c "echo 1 > /sys/block/${device}/device/delete"

# for usb
udisksctl power-off -b /dev/sdd

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identify big pods/containers

investigage big files

DST=/mnt
find /var/lib -type f -size +1G -exec ls -lh {} \; | tee  $DST/bigfiles_var_lib_$(date "+%H%M").log
find /var/lib -type f -size +1G -exec ls -lh {} \; | awk '{ print $5 ": " $9 }' | sort -rh > $DST/bigfiles_var_lib_$(date "+%H%M").sorted.log

misbehave processes

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for REPO in $(gcloud alpha container images list --repository=gcr.io/volterraio --sort-by="~TIMESTAMP"|grep -Ev '^NAME'); do \
  gcloud container images list-tags $REPO --format="table[no-heading](DIGEST,TIMESTAMP)"|\
    grep 2024-08 | xargs -I% echo $(basename $REPO) %; done |\
clipivot count --rows=0 --val=3 |sort -g -t, -k2 -r |head -n 50

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Adding trusted root certificates to the server

Mac OS X

sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain ~/new-root-certificate.crt
sudo security delete-certificate -c "<name of existing certificate>"

Windows

certutil -addstore -f "ROOT" new-root-certificate.crt

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easy-rsa 3.x

https://github.com/OpenVPN/easy-rsa/tree/master/doc

Init:

  wget https://github.com/OpenVPN/easy-rsa/releases/download/3.0.1/EasyRSA-3.0.1.tgz
  tar xzvf EasyRSA-3.0.1.tgz
  cd EasyRSA-3*
  vim vars # var.example
 ./easyrsa init-pki

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pass cheat sheet/guide

Getting started guide to the unix password manager pass. Manage gpg encripted passwords (files) in a standar directory-like hierarchy. Such files can be copied or stored in a git repository.

Requirements

1. Install [pass][pass-homepage] (standard unix password manager):

Ubuntu/Debian:

$ sudo apt-get install pass

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CA - based on gnutls-bin

---

this directory holds CA key + wildcard certificates created for new infrastructure the CA key/cert is "ca-cert.pem/key"

TODO:

• create scripts to re-generate client certificates based on NEW CA
• develop procedure to generate client/server certs from template (partialy done)
• develop procedure to generate clr files + revocate certificate + distribute them on public places

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doc

http://fahdshariff.blogspot.cz/2012/12/sed-mutli-line-replacement-between-two.html

Sed: Mutli-Line Replacement Between Two Patterns
This post has some useful sed commands which can be used to perform replacements and deletes between two patterns across multiple lines. For example, consider the following file:
$ cat file
line 1
line 2
foo

line 3

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add sign/stamp to PDF files

First convert the image to PDF

convert image.png image.pdf

Then scale up and offset the image using pdfjam (another free tool)

pdfjam --paper 'a4paper' --scale 0.3 --offset '7cm -12cm' image.pdf

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❯ sudo sntp -sS time.apple.com
Password:
+9763418.309211 +/- 0.019967 time.apple.com 17.253.14.253