codebling

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

⚠️ This is not maintained. Feel free to check comments and/or forks for more current options.

Background

This was created years ago; at the time I'd been a Shibboleth admin for nearly a decade but we needed something that could handle OIDC/OAuth and that explicitly supported OpenJDK. After a lot of investigation, I really liked Keycloak/Red Hat Single Sign-On. More details here: Gluu vs keycloack vs wso2 identity management

Comparison

(Items in bold indicate possible concerns)

Intro

This note describes how to connect two networks/devices/VMs over public network using Wireguard with Layer 2 support (ARP, IPv6 link-local, etc).

This can also be achieved using SSH and its "tap" tunnel, however, it does not provide the same level of latency and bandwidth as full-blown VPN such as Wireguard.

In addition, this note describes how to tunnel Wireguard over TCP connection. This may be of use if you encounter firewall in-between so, for instance, you can use TCP port 443 only.

Objective

ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

How to use:

./wordle.sh

Or try the unlimit mode:

	import java.security.GeneralSecurityException;
	import java.security.SecureRandom;
	import java.security.cert.X509Certificate;
	import javax.net.ssl.HostnameVerifier;
	import javax.net.ssl.HttpsURLConnection;
	import javax.net.ssl.SSLContext;
	import javax.net.ssl.TrustManager;
	import javax.net.ssl.X509TrustManager;

	/**

	import java.util.function.Consumer;
	import java.util.function.Function;
	import java.util.Optional;

	public class Example {

	public static void main(String []args) {

	// Create a series of nullable objects.
	Test a = new Test();