Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

carlwgeorge

# https://docs.ansible.com/ansible/latest/modules/dconf_module.html
#
# To determine what dconf keys and values to use, you can run `dconf watch /`
# in a terminal as you make changes in settings or tweaks.  You can also use
# `dconf read <key>` and `dconf write <key> <value>` to experiment with various
# settings.  The dconf-editor application is also useful for exploring various
# keys along with their descriptions.

- hosts: localhost
  tasks:

alces

• using Ansible command line:

ansible-playbook --connection=local 127.0.0.1 playbook.yml

• using inventory:

127.0.0.1 ansible_connection=local

shamil

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

runcom

FROM quay.io/centos-boot/centos-tier-1-dev:stream9
RUN rpm-ostree install gdm firefox gnome-kiosk-script-session plymouth-system-theme
RUN rm -rf /var/lib/gdm/.config/pulse/default.pa && rm -rf /var/lib/xkb/README.compiled
RUN echo -e "\
#Enable autologin for the user core \n\
# GDM configuration storage \n\
[daemon] \n\
# Uncomment the line below to force the login screen to use Xorg \n\
#WaylandEnable=false \n\
AutomaticLogin=core \n\

181192

How to increase the root partition size on Fedora

Boot up with an Fedora Live USB stick.

1. Run vgs to check if there's any space:

$ sudo vgs
  VG     #PV #LV #SN Attr   VSize    VFree
  fedora   1   3   0 wz--n- <237.28g    0 

wsargent

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

coderanger

How to patch Ubuntu for Heartbleed

1. sudo apt-get update
2. sudo apt-get install -y libssl1.0.0 openssl
3. openssl version -a and confirm the "built on" date is >= 2014-04-07
4. sudo lsof -n | grep ssl | grep DEL and restart all listed services.

Repeat #4 until no results are returned.

mislav

connection = Faraday::Connection.new('http://example.com') do |builder|
  builder.request :url_encoded  # for POST/PUT params
  builder.adapter :net_http
end

# same as above, short form:
connection = Faraday.new 'http://example.com'

# GET
connection.get '/posts'

ordinaryzelig

I'm a fan of MiniTest::Spec. It strikes a nice balance between the simplicity of TestUnit and the readable syntax of RSpec. When I first switched from RSpec to MiniTest::Spec, one thing I was worried I would miss was the ability to add matchers. (A note in terminology: "matchers" in MiniTest::Spec refer to something completely different than "matchers" in RSpec. I won't get into it, but from now on, let's use the proper term: "expectations").

Understanding MiniTest::Expectations

Let's take a look in the code (I'm specifically referring to the gem, not the standard library that's built into Ruby 1.9):

# minitest/spec.rb

module MiniTest::Expectations