You probably already wanted to have your own test environment to allow others in the company to tests what you did. Perhaps you have a common one, but as your team is growing, it is probable that the common environment is a bottleneck and you wish each developer could have …

This will, for instance, allow you to redirect all matching domains to a certain server: dnsmasq will intercept the DNS query and return the ip you specified.

To do this, edit NetworkManager configuration in /etc/NetworkManager/NetworkManager.conf and add in the main section dns=dnsmasq:

[main]
dns=dnsmasq

You …

I recently had to integrate Rollbar (a service to track errors) with a JS application. One nice thing about Rollbar is that if you provide it with source maps, it will point to you where the error is in the original unminified code.

Since the application is deployed with Ansible …

You can use signals and a context manager to acheive this. The idea is to register a function that will raise an exeption when the alarm signal is received and schedule the alarm signal for the timeout.

import signal
from contextlib import contextmanager


@contextmanager
def timeout(time):
    # Register a function …

Today I am going to explain how you can run multiple docker daemons on the same host. This can be useful if you want several users to use docker and want each of them to be isolated from one another (ie don't see images, containers, … of other users). The solution …