Maksim Milykh aidmax

crontab add oneliner

(crontab -l; echo "0 */4 * * * ls")| crontab -

external IP to environment variable

export EXTERNAL_IP=$(dig @resolver1.opendns.com ANY myip.opendns.com +short)

Adding a secret to environment variable without echoing to console

README

Create a template service file at /etc/systemd/system/[email protected]. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target

Bash function to execute a sequence of commands with time tracking and error handling

#!/bin/bash

do_cmd()
{
    SECONDS=0

 echo

A few show tricks to find slow queries in mongodb

Enable profiling

First, you have to enable profiling

> db.setProfilingLevel(1)

Now let it run for a while. It collects the slow queries ( > 100ms) into a capped collections, so queries go in and if it's full, old queries go out, so don't be surprised that it's a moving target...

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	# This tells kubecfg to read its config from the local directory
	export KUBECONFIG=./kubeconfig

	# Looking at the cluster
	kubectl get nodes
	kubectl get pods --namespace=kube-system

	# Running a single pod
	kubectl run --generator=run-pod/v1 --image=gcr.io/kuar-demo/kuard-amd64:1 kuard
	kubectl get pods


	pip freeze > requirements.txt
	and distribute that. T
	his will allow others using your project to reinstall all the same requirements into their virtualenv with:

	pip install -r requirements.txt

	node {
	echo 'Results included as an inline comment exactly how they are returned as of Jenkins 2.121, with $BUILD_NUMBER = 1'
	echo 'No quotes, pipeline command in single quotes'
	sh 'echo $BUILD_NUMBER' // 1
	echo 'Double quotes are silently dropped'
	sh 'echo "$BUILD_NUMBER"' // 1
	echo 'Even escaped with a single backslash they are dropped'
	sh 'echo \"$BUILD_NUMBER\"' // 1
	echo 'Using two backslashes, the quotes are preserved'
	sh 'echo \\"$BUILD_NUMBER\\"' // "1"

	output google_compute_image extension:tf
	rpm user:geerlingguy