normoes

This is more or less a sequence of manual steps, because I don't want to remove volumes I might still need, especially if no containers are using those volumes at the moment.

This is also why I, sometimes, prefer the following over: docker volume prune.

---

In situations where I have literally thousands of docker volumes, basically after a long time of not removing any docker volumes, the following comes in handy.

At first I get the 200 (just some number) biggest docker volumes (as root). I exclude containers, that contain postgres or redis in their names, essentially allowing the removal of all other volatile containers, named and unnamed.

normoes

Source: https://stackoverflow.com/questions/42478488/resize-shared-buffer-size-in-postgresql-hosted-in-aws-rds

To calculate the correct value for shared_buffers in a AWS RDS PostgreSQl database:

(2*1024*1024*12.5/100)/8)
# = 32768

The values:

normoes

Python and privy

python -c "import privy; hidden=privy.hide(secret=b'test', password='passwd', security=2); print(hidden); plain=privy.peek(hidden=hidden, password='passwd'); print(plain.decode())"

Output:

1$2$7nzvIxU2Xkt8DE4DgxwIgRt_HE6acDcPx10mCCQXbDM=$Z0FBQUFBQmU1T1pKQ0hfSVJ6bmZxZVpVckpTTzd4NElYNnVfNGdweFZiLUQtdDVCREQ2djJPLWxFVG81bXNHaUtmbnJ4NTVYZXpLbm1CdWl4aEF0cFd3ZTJES19HR1ViNXc9PQ==
test

normoes

Get ASHandle of a domain

I wanted to get all IPs that belong to facebook.com.

The command I found is the following

whois -h whois.radb.net -- '-i origin AS32934'

whois -h whois.radb.net -- '-i origin AS32934' | grep ^route

normoes

Getting the tls pubkey for a DNS over TLS address

I added cloudflare-dns.com to my stubby.yml and couldn't find any information on the value of the tls_pubkey_pinset

tls_pubkey_pinset:
  - digest: "sha256"
    value: MISSING

Although I could find some examples, the value seemed to be wrong.

normoes

Text file is busy

When executing a file whose permissions were changed earlier, a Text file is busy error could appear.

RUN cd scripts/test_env \
    && chmod +x test.prepareapp.sh
    && ./test.prepareapp.sh

It helps to add sync after changing permissions on the file:

normoes

This can be used to retreive files/binaries/information from docker containers.

#!/bin/bash

set -Eeuo pipefail

mkdir ./binary || true

# build most recent docker image

normoes

Ledger nano s

Ledger nano s initialization

After unboxing the ledger, I just connected it via the USB cable. It powered up perfectly and started the initialization process. The ledger asked to set a PIN, then I had to copy the seed word by word and confirm it by repeating it word by word.

I had a short look into the settings and naively tried to create a HW wallet using monero-wallet-cli (see below for the actual command).

Getting the ledger recognized by the system

It turned out the ledger nano s was not detected by my linux system (ubuntu 18.04), so I searched the internet and found a script (see below) from

normoes

create venv in project directory

# create project directory
mkdir ~/project && cd ~/project
# create virtual environment
PIPENV_VENV_IN_PROJECT=true pipenv --three
# check location
pipenv --venv
# output

normoes

Get latest:

curl --silent "https://api.github.com/repos/monero-project/monero/releases/latest" | grep '"tag_name":' | cut -d ':' -f2 | tr -d '", '

Get all

curl --silent "https://api.github.com/repos/monero-project/monero/releases" | grep '"tag_name":' | cut -d ':' -f2 | tr -d '", ' | head -n1