24 Jul 2018
Docker Compose is a amazing tool for manage and running multi-container docker applications. it’s allow you to easily encapsulated your ruby on rails environment including database inside container. This tutorial will guide you through how to up and running a Ruby on Rails application with a Postgres inside a container.
In this tutorial i’m using docker version version 18.06.0-ce and docker-compose version version 1.22.0. You should have basic knowledge about it before continuing to the next step.
Getting Started
Create new project folder and cd into it. We will create new rails project with rails new, before running it, we need to create Dockerfile first
$ mkdir -p ~/Workspace/rails-docker
$ cd ~/Workspace/rails-docker
$ vi Dockerfile
and define basic environment in it.
FROM ruby:2.5-alpine
RUN apk update && apk add build-base postgresql-dev
RUN mkdir /app
WORKDIR /app
COPY Gemfile Gemfile.lock ./
RUN bundle install --binstubs
COPY . .
CMD puma -C config/puma.rb
17 Dec 2016
I found this blog which describe how to build erlang project using rebar and then generating release with reltool : http://alancastro.org/2010/05/01/erlang-application-management-with-rebar.html. I’m following step by step and everything goes smoothly until the step when trying to run the release with reltool. I had got stuck during release generation, this error occours when i run command service with console
sh mysample/bin/mysample console
{"init terminating in do_boot",{'cannot load',elf_format,get_files}}
Crash dump is being written to: erl_crash.dump...done
init terminating in do_boot ()
Read More >>
24 Nov 2016
If you have problem experienced when you run phoenix server and got error like this [error] Failed to start Ranch listener CoWall.Endpoint.HTTP in :ranch_tcp:listen([port: 4000]) for reason :eaddrinuse (address already in use) . It’s mean that, the default port(4000) has reserved with another process, so you need to release it or use another port.
If you want to known which process is listening on this port You can use this linux cmd lsof -i :4000 to find out more, See this article for examples: http://www.cyberciti.biz/faq/what-process-has-open-linux-port/. Below is the example one.
(erlang-1802)[yrsdi@mac co_wall]$ lsof -i :4000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
Google 274 yrsdi 103u IPv4 0xa174d9f2406034c5 0t0 TCP localhost:54543->localhost:terabase (ESTABLISHED)
beam.smp 7640 yrsdi 20u IPv4 0xa174d9f2438e60e5 0t0 TCP *:terabase (LISTEN)
beam.smp 7640 yrsdi 25u IPv4 0xa174d9f2443e7bcd 0t0 TCP localhost:terabase->localhost:54543 (ESTABLISHED)
Use another port
$ PORT=4001 mix phoenix.server
or release it
03 Sep 2016
Introduction
Programming languages regularly release new versions. As a developer, I need to try that version without breaking our existing application in our local environment. The solution is using the version manager tool. version manager helps developers switch between versions easily, several languages have version managers (like SDKman for Java, NVM for Node.js, or Rbenv/RVM for Ruby, etc).
Too many tools in our local environment is another obstacle. in my case, I need one tool that can be handling multiple programming languages in multiple versions. so my choice is ASDF.
In this tutorial, you’ll learn how to install specific versions of Erlang/OTP and Elixir and use the ASDF as version manager.
Install asdf
asdf is a version manager tool that supports various programming languages including Ruby, Node.js, Erlang, Elixir and more. Before install asdf you need to install the curl and git utilities as prerequisites.
$ brew install coreutils curl git # on macOS with Homebrew
$ sudo apt install curl git # on Linux
After the prerequisites installed, now ready to install the ASDF:
$ git clone https://github.com/asdf-vm/asdf.git ~/.asdf
Depending on your OS, in this guide I use OSX. if you are using OSX, open ~/.bash_profile and put this path. If you are on linux, put on ~/.bashrc
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01 Sep 2016
** (MatchError) no match of right hand side value: {:error, {:ssl, {'no such file or directory', 'ssl.app'}}}
(mix) lib/mix/utils.ex:409: Mix.Utils.read_httpc/1
(mix) lib/mix/utils.ex:354: Mix.Utils.read_path/2
(mix) lib/mix/local.ex:107: Mix.Local.read_path!/2
(mix) lib/mix/local.ex:86: Mix.Local.find_matching_versions_from_signed_csv!/2
(mix) lib/mix/tasks/local.hex.ex:23: Mix.Tasks.Local.Hex.run/1
(mix) lib/mix/dep/loader.ex:140: Mix.Dep.Loader.with_scm_and_app/4
(mix) lib/mix/dep/loader.ex:98: Mix.Dep.Loader.to_dep/3
(elixir) lib/enum.ex:1043: anonymous fn/3 in Enum.map/2
%
If you use version manager like kerl for installing erlang system, you need to re-configure openssl to add full path of it. in this case I build new erlang version and set openssl to kerl config
$ KERL_CONFIGURE_OPTIONS="--with-ssl=/usr/local/opt/openssl" kerl build 18.2 erlang-1802
Resosource : http://quabr.com/35170911/mix-deps-get-failed-seems-missing-ssl
27 Aug 2016
To install erlang on Mac OSX is so easier, you just go to download from this site and installing it by one click or using homebrew by using brew install erlang command and tada your erlang will live on your system. But Installing by using it. It will force you to have only one version of the language to use at any point in time, when you need a specific language version of erlang for one of your projects, you will have to break. Versioned language management is the way to avoid the hassle of it.
Kerl is a versioned management tool to building and installing of Erlang/OTP instances. Here are Prerequisites, before installing it on Mac OS X.
- XCode Developer Tools
- Homebrew – Package Manager
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12 Nov 2014
Scastie adalah Scala pastebin yang merupakan salah satu tool yang bisa jadi pilihan
untuk mendebug code scala secara online. Fitur-fiturnyapun cukup lengkap untuk keperluan debbuging.
salah satu fiturnya adalah realtime update pada saat copy paste code, dan running code,
memungkinkan untuk menghapus dan cloning paste, memungkinkan untuk menentukan versi scala,
menyediakan beberapa template yang berguna (misalnya scalaz, Akka, bermain, scala 2.10)
untuk lengkapnya bisa dibaca https://github.com/OlegYch/scastie
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