Clivern

A Software Engineer and Occasional Writer.

Leveraging Consul’s DNS Interface

08 May 2019

Consul DNS interface allows applications to make use of service discovery without any integration with Consul. For example, instead of making HTTP API requests to Consul, a host can use the DNS server directly via name lookups like clivern.service.us.consul.

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Django Custom Month and Year Lookup

27 April 2019

Everyone want to keep Django timezone support but sometimes you need to keep your SQL queries a way from timezone conversion especially if by default your application timezone is UTC. Django will do something like this `CONVERT_TZ(`app_incident`.`datetime`, 'UTC', 'UTC'))` and it will return `Null` if the timezone table is empty. Even that conversion is not even needed.

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Django Custom Lookups

23 April 2019

By default Django has a `date` lookup that support timezones. It actually will wrap your field with `CONVERT_TZ` in case `USE_TZ` is `True`. This is pretty awesome unless you have timezones table empty because this call will return `Null.`

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Building a Service Mesh with Consul

16 February 2019

Load balancers aren't efficient in a dynamic environment where we scale services up or down. Consul uses a registry to keep a real-time list of services, their location, and their health. Services query the registry to discover the location of upstream services and then connect directly. This allows services to scale up/down and gracefully handle failure

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Docker in a Nutshell

21 October 2017

Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files.

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How To Set Up MySQL Master-Master Database Replication

03 September 2017

One of the most difficult tasks for software engineers is scaling out the databases incase of large traffic applications. Today we will discuss one of the horizontal scaling techniques which is the Master-Master replication. Master-Master replication adds speed and redundancy and also distribute the writes load over many servers.

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Build Realtime Apps With Redis PubSub

02 September 2017

Last week I worked with Pusher. Pusher is really amazing product to build scalable realtime apps. Also there is slanger and Poxa, Both are open source implementation compatible with Pusher libraries. But today we will use PHP, NodeJs, SocketIO and Redis Pub/Sub To work with realtime messaging.

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How To Install LAMP Stack on Ubuntu

02 May 2017

LAMP stack is a group of open source software and it stands for Linux, Apache, MySQL, and PHP. To install them Just run the following bash script with a non-root user with sudo privileges configured on a server running Ubuntu.

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