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@synther
synther / gist:d376100a8bae896d0caf
Last active June 16, 2025 15:51
linux signals cheat sheet
Signal Value Action Comment
SIGHUP 1 Term Hangup detected on controlling terminal or death of controlling process
SIGINT 2 Term Interrupt from keyboard
SIGQUIT 3 Core Quit from keyboard
SIGILL 4 Core Illegal Instruction
SIGABRT 6 Core Abort signal from abort(3)
SIGFPE 8 Core Floating point exception
SIGKILL 9 Term Kill signal
SIGSEGV 11 Core Invalid memory reference
SIGPIPE 13 Term Broken pipe: write to pipe with no readers
@afolarin
afolarin / resource_alloc_docker.md
Last active December 22, 2025 22:00
Resource Allocation in Docker

#Container Resource Allocation Options in docker-run

now see: https://docs.docker.com/engine/reference/run/#runtime-constraints-on-resources

You have various options for controlling resources (cpu, memory, disk) in docker. These are principally via the docker-run command options.

##Dynamic CPU Allocation -c, --cpu-shares=0
CPU shares (relative weight, specify some numeric value which is used to allocate relative cpu share)

@P7h
P7h / tmux_vs_screen.md
Last active June 2, 2026 15:13
tmux vs screen commands

tmux vs. screen commands


Action tmux screen
start a new session tmux
tmux new
tmux new-session
screen
start a new session with a name tmux new -s name screen -S name
re-attach a detached session tmux attach
tmux attach-session
screen -r
re-attach a detached session with a name tmux attach -t name
tmux a -t name
screen -r name
re-attach an attached session (detaching it from elsewhere) tmux attach -dtmux attach-session -d screen -dr
@tuxfight3r
tuxfight3r / tcp_flags.txt
Last active May 26, 2026 15:57
tcpdump - reading tcp flags
##TCP FLAGS##
Unskilled Attackers Pester Real Security Folks
==============================================
TCPDUMP FLAGS
Unskilled = URG = (Not Displayed in Flag Field, Displayed elsewhere)
Attackers = ACK = (Not Displayed in Flag Field, Displayed elsewhere)
Pester = PSH = [P] (Push Data)
Real = RST = [R] (Reset Connection)
Security = SYN = [S] (Start Connection)
@johanndt
johanndt / upgrade-postgres-9.3-to-9.5.md
Last active July 27, 2024 16:49 — forked from dideler/upgrade-postgres-9.3-to-9.4.md
Upgrading PostgreSQL from 9.3 to 9.5 on Ubuntu

TL;DR

Install Postgres 9.5, and then:

sudo pg_dropcluster 9.5 main --stop
sudo pg_upgradecluster 9.3 main
sudo pg_dropcluster 9.3 main
@slattery
slattery / firstboot.sh.erb
Created December 16, 2015 14:19 — forked from mtak/firstboot.sh.erb
Generator for Debian preseed files
#!/bin/sh
# set hostname
echo <%= hostname %> > /etc/hostname
/etc/init.d/hostname.sh
# Set up networking
cat > /etc/network/interfaces << EOF
# The loopback network interface
auto lo
@drmalex07
drmalex07 / README-setup-systemd-timer.md
Last active May 11, 2023 19:17
An example systemd timer. #systemd #timer #systemd.timer #cron #cronjob

README

Timers provided by systemd can be used as cronjob replacements. More at man systemd.timer.

Suppose we want to periodically trigger cleanup tasks for a baz utility. We 'll create a baz-cleanup.service which will be triggered by a baz-cleanup.timer.

Define the target service unit

Create a minimal service at /etc/systemd/system/baz-cleanup.service:

@shmup
shmup / torrents.md
Last active May 25, 2026 22:53
transmission blocklist guide

Transmission Blocklist

The Transmission torrent client has an option to set a Blocklist, which helps protect you from getting caught and having the DMCA send a letter/email.

It's as simple as downloading and installing the latest client:

@kyptov
kyptov / rabbitmq_cheatsheet_ru.md
Last active August 21, 2025 08:02
RabbitMQ Cheat Sheet (russian)

Общие упрощенные понятия. Возможно существуют способы задать другое поведение нежели данное упощенное.

Понятия

  • producer - отправитель, программный код, который отправляет сообщение.
  • consumer - получатель, программный код, который должен получить сообшение.
  • exchange - обменник, функционал RabbitMQ, получает сообщение с заданными параметрами от отправителя и:
    • может сбросить(удалить) сообщение или вернуть отправителю (зависит от атрибутов сообщения),
    • может отправить сообщение в очередь,
    • может отправить сообщение в несколько очередей (сообщение будет скопировано для каждой очереди)
  • queue - очередь, функционал RabbitMQ, хранит все сообщения и раздает их получателям.
  • message - сообщение, содержит атрибуты необходимые RabbitMQ, а также данные для передачи от отправителя к получателю
@delameko
delameko / upgrade-postgres-9.5-to-9.6.md
Last active March 30, 2026 03:42 — forked from johanndt/upgrade-postgres-9.3-to-9.5.md
Upgrading PostgreSQL from 9.5 to 9.6 on Ubuntu 16.04

TL;DR

Install Postgres 9.6, and then:

sudo pg_dropcluster 9.6 main --stop
sudo pg_upgradecluster 9.5 main
sudo pg_dropcluster 9.5 main