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What do Etcd, Consul, and Zookeeper do?

• Service Registration:
  • Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
• Service Discovery:
  • Ability for client application to query the central registry to learn of service location.
• Consistent and durable general-purpose K/V store across distributed system.
  • Some solutions support this better than others.
  • Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
• Centralized locking can be based on this K/V store.

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Go (Golang) Standard Library Interfaces (Selected)

This is not an exhaustive list of all interfaces in Go's standard library. I only list those I think are important. Interfaces defined in frequently used packages (like io, fmt) are included. Interfaces that have significant importance are also included.

All of the following information is based on go version go1.8.3 darwin/amd64.

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webserver=yes
webserver-address=0.0.0.0
webserver-port=8081
webserver-allow-from=0.0.0.0/0
api=yes
api-key=changeme
local-port=5300
launch=gsqlite3
gsqlite3-database=/opt/homebrew/etc/powerdns/pdns.sqlite3

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Using a Local Registry with Minikube

Install a local Registry

These instructions include running a local registry accessible from Kubernetes as well as from the host development machine at registry.dev.svc.cluster.local:5000.

1. Use the docker CLI to run the registry:2 container from Docker, listening on port 5000, and persisting images in the ~/.registry/storage directory.

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dotnet nuget add source https://api.nuget.org/v3/index.json -n nuget.org

check file:
%appdata%\NuGet\NuGet.Config

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#!/bin/bash

if [ $# -lt 1 ]
then
cat << HELP

dockertags  --  list all tags for a Docker image on a remote registry.

EXAMPLE: 
    - list all tags for ubuntu:

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### Keybase proof

I hereby claim:

  * I am geokal on github.
  * I am gakis41 (https://keybase.io/gakis41) on keybase.
  * I have a public key ASBh_LNb9l6qu8btC5myIefiAExxD2VGkZ5tDQ09VgK2pQo

To claim this, I am signing this object:

geokal

Keybase proof

I hereby claim:

• I am geokal on github.
• I am gakis41 (https://keybase.io/gakis41) on keybase.
• I have a public key ASAZoLIiWLyquZlfXMh5bJHUMibZs2EhCEoywoC4cxR2hgo

To claim this, I am signing this object:

geokal

vpngate.py

This script allows to use the free VPN service provided by VPNGate in an easy way. The user just needs to provide the desidered output country, and the script automatically chooses the best server.

After this step, OpenVPN is launched with the proper configuration. The VPN can be terminated by pressing Ctrl+C.

Usage

Run the script by providing the desired output country:

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let regex;

/* matching a specific string */
regex = /hello/; // looks for the string between the forward slashes (case-sensitive)... matches "hello", "hello123", "123hello123", "123hello"; doesn't match for "hell0", "Hello" 
regex = /hello/i; // looks for the string between the forward slashes (case-insensitive)... matches "hello", "HelLo", "123HelLO"
regex = /hello/g; // looks for multiple occurrences of string between the forward slashes...

/* wildcards */
regex = /h.llo/; // the "." matches any one character other than a new line character... matches "hello", "hallo" but not "h\nllo"
regex = /h.*llo/; // the "*" matches any character(s) zero or more times... matches "hello", "heeeeeello", "hllo", "hwarwareallo"