James Dube jamesdube

Envoy TCP Proxy

This is an example of Envoy TCP Proxy from localhost:10000 to www.google.com:80. See also https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/listeners/tcp_proxy.

To run a proxy:

% docker run --rm getenvoy/envoy:stable --version

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.

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"]}

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:

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

	stages:
	- build
	- push
	- cleanup

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

	@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.
	}

	#!/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

	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