James Dube jamesdube

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

How to disable systemd-resolved in Ubuntu

Stages

Disable and stop the systemd-resolved service:

  sudo systemctl disable systemd-resolved.service
  sudo systemctl stop systemd-resolved

Then put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf:

Enable TCP port 2375 for external connection to Docker

See this issue.
Docker best practise to Control and configure Docker with systemd.

Create daemon.json file in /etc/docker:

 {"hosts": ["tcp://0.0.0.0:2375", "unix:///var/run/docker.sock"]}

This gist describes the configuration required for Spring reactive WebClient to make a call to an OAuth2 protected resource through OAuth2.0 Client Credentials Grant Type Flow.

Assumption is that the Authorization Server supports OpenId Connect 1.0 specifications.

	#!/bin/bash
	# run this scripts with `bash emoji-info.sh` or `./emoji-info.sh`

	usage() {
	cat << EOF
	usage: $0 [options] <emoji>

	Options:
	-h Show this message
	-o Octal Escape Sequence

	import java.net.InetSocketAddress
	import scala.xml.{Elem, XML}
	import org.jboss.netty.buffer.ChannelBuffers
	import org.jboss.netty.util.CharsetUtil.UTF_8
	import com.twitter.finagle.Service;
	import com.twitter.finagle.builder.ClientBuilder;
	import com.twitter.finagle.http.{Http, RequestBuilder};
	import org.jboss.netty.handler.codec.http._
	import org.jboss.netty.buffer.ChannelBuffers.wrappedBuffer
	import java.net.URL

	#!/usr/bin/env python

	import gitlab
	from jira import JIRA
	import urllib3

	## Disable urllib3 ssl checks warnings
	urllib3.disable_warnings( urllib3.exceptions.InsecureRequestWarning )

	## GitLab config

	@Component
	public class LogFilter extends OncePerRequestFilter {

	private static Logger LOG = LoggerFactory.getLogger(LogFilter.class);

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
	throws ServletException, IOException {
	LOG.info(request.getRequestURI()); // log the request path.
	}

	stages:
	- build
	- push
	- cleanup

	build:
	stage: build
	variables:
	REGISTRY_SERVER: foo.bar
	IMAGE_NAME: vrutkovs-public/openshift-ansible-testing