karlospn

sachinsmc

Top HN posts

1. Ask HN: What books changed the way you think about almost everything?

2. Ask HN: What are the best MOOCs you've taken?

3. Ask HN: How to self-learn electronics?

4. Ask HN: Successful one-person online businesses?

nginx-gists

#!/usr/bin/env bash

if [ "$EUID" -ne 0 ];then
  >&2 echo "This script requires root level access to run"
  exit 1
fi

if [ -z "${WORDPRESS_DB_PASSWORD}" ]; then
  >&2 echo "WORDPRESS_DB_PASSWORD must be set"
  >&2 echo "Here is a random one that you can paste:"

martezr

#!/usr/local/bin/python3

import os
import time
import hvac
import urllib3
from prettytable import PrettyTable

urllib3.disable_warnings()

MichaelSimons

Retrieving Docker Image Sizes

There are two metrics that are important to consider when discussing the size of Docker images.

1. Compressed size - This is often referred to as the wire size. This affects how fast/slow images can be pulled from a registry. This impacts the first run experience on machines where images are not cached.
2. Uncompressed size - This is often referred to as the size on disk. This affects how much local storage is required to support your Docker workloads.

The example commands shown below will work on Windows, MacOS, and Linux.

How to Measure the Compressed Size

FilipaBarros

Top Questions for Sysadmin Interview:

Disclaimer: These questions and answers aren't at all mine. These were scavanged around in the web. I hope it helps.

Basic:

1. What is Linux and also explain the basic components of Linux?

   Answer: Linux is the most commonly used operating system that is open source and free. For any computer, the operating system acts as the backbone, and it is most important software that is required for any computer.

adam-hanna

Introduction

I often find myself ssh'ing into my servers and checking my systemd service logs with $ journalctl -f -u {name}.service. One day I got tired of this and wanted all of my important logs in once place (Amazon AWS Cloudwatch). To my dismay, there weren't any real good tutorials on how to do so. So, voilà.

Steps

Overall, it's a fairly simple process consisting of the following few steps.

1. Modify the service file

Open the service file with $ sudo vi /lib/systemd/system/{name}.service

Modify the [Service] section:

tuxpower

package main

import (
	"fmt"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/ec2"
)

func main() {

ekreutz

Ansible variable precedence

Source: http://docs.ansible.com/ansible/latest/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable

From least to most important

• command line values (for example, -u my_user, these are not variables)
• role defaults (defined in role/defaults/main.yml)
• inventory file or script group vars
• inventory group_vars/all

realityforge

MAX_BUILDS = 5
MAX_ENV_BUILDS = 2

Jenkins.instance.getAllItems(org.jenkinsci.plugins.workflow.job.WorkflowJob.class).each { it ->
  def job = Jenkins.instance.getItemByFullName(it.fullName, Job.class)
  def limit = (it.fullName =~ /^environment/) ? MAX_ENV_BUILDS : MAX_BUILDS
  def recent = job.getBuilds().limit(limit)
  println "Processing job " + it.fullName + " " + it.class + " BuildCount: " + job.getBuilds().size() + " Limit: " + limit