Khoulaiz

Here are several different ways to test a TCP port without telnet.

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23

nathanielks

This script will pull down an S3 remote configuration before running any terraform actions. Assumes the following structure:

main.tf
terraform.cfg
env/dev/vars
env/staging/vars
env/whatever/vars
env/whatever/somefile.tf

gaearon

function mapValues(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    result[key] = fn(obj[key], key);
    return result;
  }, {});
}

function pick(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    if (fn(obj[key])) {

apparentlymart

Issues with Terraform State Management

The idea of "state" is the lynchpin of Terraform, and yet Terraform's workflow is fraught with gotchas that can lead to the loss or destruction of state. This doc is a set of notes about issues I've encountered, what caused them, and in many cases ideas about how to improve Terraform to avoid or reduce the chances of them.

Each of these scenarios has occured at least within my team. Each time one of these occurs it erodes people's confidence in Terraform, giving it a reputation for being fragile and unforgiving of errors. This this document is not written just to criticize but rather to identify ways in which the situation could be improved.

mattupstate

resource "aws_db_instance" "core" {
    username = "postgres"
    password = "changeme"
    ...
}

resource "null_resource" "master_password" {
    triggers {
        db_host = "${aws_db_instance.address}"
    }

maxvt

Currently, there is an explosion of tools that aim to manage secrets for automated, cloud native infrastructure management. Daniel Somerfield did some work classifying the various approaches, but (as far as I know) no one has made a recent effort to summarize the various tools.

This is an attempt to give a quick overview of what can be found out there. The list is alphabetical. There will be tools that are missing, and some of the facts might be wrong--I welcome your corrections. For the purpose, I can be reached via @maxvt on Twitter, or just leave me a comment here.

There is a companion feature matrix of various tools. Comments are welcome in the same manner.

apparentlymart

AWS Describe and Get actions as Terraform Data Sources

Beyond the read-only resources that existed in Terraform before data resources were an official feature, I'd like to make room for a new pattern for re-usable modules where they accept only the minimum set of ids they need as variables and look up other data via data sources.

Here's a motivating example:

variable "aws_subnet_id" {
    description = "Id of the subnet where the EC2 instance will be created"
}

hakobe

package main

import (
	"io"
	"log"
	"net"
	"time"
)

func reader(r io.Reader) {

adambom

Run this in order to backup all you k8s cluster data. It will be saved in a folder bkp. To restore the cluster, you can run kubectl apply -f bkp.

Please note: this recovers all resources correctly, including dynamically generated PV's. However, it will not recover ELB endpoints. You will need to update any DNS entries manually, and manually remove the old ELB's.

Please note: This has not been tested with all resource types. Supported resource types include:

• services
• replicationcontrollers
• secrets
• deployments
• horizontal pod autoscalers

amitkgupta

kubernetes.click-ops

1. Generalizing to your own Kubernetes cluster
2. A note on non-standard kops and nodeup binaries
3. Installing required binaries
4. Setting up "permanent" resources
5. Creating the cluster
6. Administering the cluster
7. Other operations on the cluster
8. Updating your local state