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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

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$ genisoimage  -output seed.iso -volid cidata -joliet -rock user-data meta-data

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stages:
- build
- push
- cleanup

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

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@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.
    }

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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.

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#!/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

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Enable TCP port 2375 for external connection to Docker

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

1. Create daemon.json file in /etc/docker:

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

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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:

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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

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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