brasey

Use AWS CLI and jq to do some things

I'm just getting up to speed on AWS, and so I'm learning my way around the CLI. It's nice and easy to do lots of things from the CLI, like querying, creating and destroying instances and images. There are lots of fiddly bits involved in parsing output so it can be used by a script or something, though, so here are some notes.

Tools

AWS CLI

Obviously you need the AWS CLI. It's an easy install using pip. Go here to find documentation and other install methods.

ghafran

DROP FUNCTION IF EXISTS MurmurHashV3;
DELIMITER //
CREATE FUNCTION `MurmurHashV3`(`keyx` varchar(65535), `seed` int unsigned)
	RETURNS int unsigned
BEGIN
	DECLARE remainder,bytes,c1,c2,i, m1,m2 INT unsigned;
	DECLARE h1,k1,h1b BIGINT unsigned;
	SET remainder = LENGTH(keyx) & 3;
	SET bytes = LENGTH(keyx) - remainder;
    SET h1 = seed;

hummus

wget http://stedolan.github.io/jq/download/linux64/jq 
aws ec2 describe-instances --filters "Name=tag:Name,Values=$NAME" \
  "Name=instance-state-name,Values=running" \
  |  jq -r \
  ".Reservations[] | .Instances[] | .InstanceId" \

aws ec2 describe-volumes --filters \
  "Name=status,Values=available" \
  | jq -r ".Volumes[] | .VolumeId" \

martijnvermaat

SSH agent forwarding and screen

When connecting to a remote server via SSH it is often convenient to use SSH agent forwarding so that you don't need a separate keypair on that server for connecting to further servers.

This is enabled by adding the

ForwardAgent yes

option to any of your Host entries in ~/.ssh/config (or alternatively with the -A option). Don't set this option in a wildcard Host * section since any user on the remote server that can bypass file permissions can now als use keys loaded in your SSH agent. So only use this with hosts you trust.

jnrbsn

sudo yum update
sudo yum install python27
curl https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py | sudo /usr/bin/python27
sudo easy_install pip
echo "alias python='python27'" >> ~/.bashrc
source ~/.bashrc

justlaputa

jobs

jenkins_url + /api/json?tree=jobs[name,color]

builds

jenkins_url + /job/${job_name}/api/json?tree=builds[number,status,timestamp,id,result]

last build

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

andrewrcollins

function ltrim(s) { sub(/^[ \t\r\n]+/, "", s); return s }
function rtrim(s) { sub(/[ \t\r\n]+$/, "", s); return s }
function trim(s)  { return rtrim(ltrim(s)); }
BEGIN {
# whatever
}
{
# whatever
}
END {

snuggs

############################################################################
#  _
# | |_ _ __ ___  _   ___  __
# | __| '_ ` _ \| | | \ \/ /
# | |_| | | | | | |_| |>  <
#  \__|_| |_| |_|\__,_/_/\_\
#
#  Cheatsheets:
#    https://devhints.io/tmux
# `property not found` issue: