Josemar Furegatti de Abreu Silva

domingo, 5 de novembro de 2017

Installing OpenJDK (8 default for Ubuntu 16.04)

1. Introduction

This post shows how to install Open JDK 8 default for Ubuntu 16.04.

2. Step By Step

2.1. Update package list

$ sudo apt-get update

2.2. Install Java JDK 8 default

$ sudo apt-get install default-jdk

2.3. Testing Java Compiler

$ javac -version

3. References

quinta-feira, 2 de novembro de 2017

Install Jenkins on Ubuntu 16.04

1. Introduction

2. Step by Step

2.1. Prerequisites

2.1.a. Check Memory available

1 GB of RAM minimum;
4 GB desired;

2.1.b. System Update

$ sudo apt-get update

2.2. Install Jenkins

$ wget -q -O - https://pkg.jenkins.io/debian/jenkins-ci.org.key | sudo apt-key add -
OK
$ cat /etc/apt/sources.list.d/jenkins.list
deb http://pkg.jenkins.io/debian-stable binary/
$ sudo apt-get update

2.3. Upgrade Jenkins version ( optional )

$ sudo apt-get update
$ sudo apt-get install jenkins

2.4. Cheking services

$ # Ubuntu/Debian (different from CentOs/Fedora) usually starts software after installation
$ # Jenkins will be started as a deamon service named 'jenkins'
$ # See /etc/init.d/jenkins for more details. Log file will be placed in /var/log/jenkins/jenkins.log.
$ # Config parameters like JENKINS_HOME and etc, will be captured on /etc/default/jenkins
$ # By default, Jenkins listen on port 8080. Edit /etc/default/jenkins to change port
$ # To start-stop-status service do: sudo service jenkins stop; sudo service jenkins start; sudo service jenkins status

2.5. Check/allow firewall rules

a) Check firewall status - Inactive? Great nothing to do

$ sudo ufw status
Status: inactive

b) Check firewall status - Active? add rule to allows Jenkins port

$ sudo ufw status
Status: active
:
8080 ALLOW Anywhere
:
$ sudo ufw allow 8080

2.6. Setting up Jenkins

a) Access Jenkins interface on browser and you'll see "Unlock Jenkins screen"

http://localhost:8080

b) Install suggested plugins

+------------------------------------------------+
| Customize Jenkins |
| +------------------+ |
| |Install Suggested | |
| | Pluggins | | <- click button
| +------------------+ |
+------------------------------------------------+

c) Create first admin user

3. References

quinta-feira, 20 de julho de 2017

Manipulating text files on linux

1. Introdução

This post gathers information about how to manipulates text files on linux systems.

2. Referências

http://terminalroot.com.br/2015/07/30-exemplos-do-comando-sed-com-regex.html

terça-feira, 18 de julho de 2017

How to Increase the size of a Linux LVM by adding a new disk

1. Introduction

This post olny gathers information about how to increase size linux LVM.

2. References

* https://www.rootusers.com/how-to-increase-the-size-of-a-linux-lvm-by-adding-a-new-disk/

sexta-feira, 2 de junho de 2017

DOCKER Faq, HowTo, Referece, Sample Install Run PostgreSQL in a Docker

1. Introduction

This post gathers information about PostgreSQL and Docker.

2. Step-by-Step

2.1. Ensure Docker, Docker Compose are working

# docker --version
Docker version 17.03.1-ce, build c6d412e
# docker-compose --version
docker-compose version 1.11.2, build dfed245

2.2. Install a PostgreSQL Docker

Determining PostgreSQL Docker Version to install

# psql --version
psql (PostgreSQL) 9.6.3

Pull docker image versions

# docker pull postgres:9.6.3-alpine
# docker pull postgres:9.6.3

Run PostgreSQL Docker Image in background - database instance

# docker run --name postgres-01 -e POSTGRES_PASSWORD=mysecretpassword -d postgres:9.6.3-alpine
# docker run --name postgres-02 -e POSTGRES_PASSWORD=mysecretpassword -d postgres:9.6.3

Check both Docker process images running

# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
676278f9f054 postgres:9.6.3 "docker-entrypoint..." 7 seconds ago Up 7 seconds 5432/tcp postgres-02
0d93213e347e postgres:9.6.3-alpine "docker-entrypoint..." 12 seconds ago Up 11 seconds 5432/tcp postgres-01

Stop Docker instance "postgres-02"

# docker stop postgres-02
# docker kill postgres-02

Run PostgreSQL psql command line, linked to running instance "postgres-01", using interative mode. Interate with application saying the password "mysecretpassword"

# docker run --name postgres-psql-01 -it --rm --link postgres-01:postgres postgres psql -h postgres-01 -U postgres:9.6.3-alpine
Password for user postgres: mysecretpassword
psql (9.6.3)
Type "help" for help.

postgres=# select current_date;
date
------------
2017-06-03

(1 row)

postgres=# \q

Run PostgreSQL plsql command line, linked to running instance "postgres-01", using interative mode, using password in command line

3. References

RAILS Faq, HowTo, Reference, Sample Setup a Rails App With Apache and Passenger on CentOS 6

1. Introduction

This post gathers information about how to setup RAILS APP with Apache and Passenger on CentOS 6.

2. Step-by-Steyp

Step#1: First of all, mantain your linux so up-to-date

# yum update

Step#2: Install Apache

# yum install httpd

Step#3: Install apache

# yum install httpd curl-devel httpd-devel

Step#4: Get Apache to start on boot:

# chkconfig httpd on

Step#5: Install Phusion Passenger and dependency packages

# gem install passenger
# yum install curl-devel httpd-devel

Step#6: Compile the environment:

# passenger-install-apache2-module

Step#7 Edit the Apache config file in etc/httpd/conf/httpd.conf

Uncomment the line containing NameVirtualHost *:80 towards the end
Paste the output from (Step#6 Compile environment) anywhere at the end of the file, eg:

# vim etc/httpd/conf/httpd.conf

LoadModule passenger_module /usr/local/rvm/gems/ruby-2.1.1/gems/passenger-4.0.41/buildout/apache2/mod_passenger.so

PassengerRoot /usr/local/rvm/gems/ruby-2.1.1/gems/passenger-4.0.41

PassengerDefaultRuby /usr/local/rvm/gems/ruby-2.1.1/wrappers/ruby

ServerName 1.2.3.4 # www.whatever.com

DocumentRoot /var/www/rails/public # the path to your rails app

AllowOverride all

Options -MultiViews

</Directory>

</VirtualHost>

3. References

https://www.digitalocean.com/community/tutorials/how-to-setup-a-rails-4-app-with-apache-and-passenger-on-centos-6
https://stackoverflow.com/questions/5584759/start-rails-server-automatically-after-boot

terça-feira, 23 de maio de 2017

RAILS Faq HowTo Reference Sample Using scopes on Rails to Filter index page and Re-display filter inputs

1. Introduction

This post gathers information about FAQ-Frequently Asked Question, How To, technical document references and samples about these RAILS topics.

Using scopes on Rails to Filter index page and Re-display filter inputs

2. FAQ, HOWTO, REFERENCES, SAMPLES, etc

2.1. Create model scopes for each filter condition

# vim app/models/cluster_config.rb

class ClusterConfig < ApplicationRecord

include Filterable

scope :cluster_config, -> (id) { where id: id}

scope :cluster_status, -> (cluster_status_id) { where cluster_status_id: cluster_status_id}

scope :cluster_environment_type, -> (cluster_environment_type_id) { where cluster_environment_type_id: cluster_environment_type_id}

scope :cluster_content_type, -> (cluster_content_type_id) { where cluster_content_type_id: cluster_content_type_id}

end

2.2. Implement generic filter on model concerns

# vim app/models/concerns/filterable.rb

module Filterable

extend ActiveSupport::Concern

module ClassMethods

def filter(filtering_params)

results = self.where(nil)

filtering_params.each do |key, value|

results = results.public_send(key, value) if value.present?

end

results

end

2.3. Implement filter on index controller

# vim app/controllers/cluster_configs_controller.rb

class ClusterConfigsController < ApplicationController

before_action :set_cluster_config, only: [:show, :edit, :update, :destroy]

def index

@cluster_configs = ClusterConfig.filter(params.slice(:cluster_config, :cluster_status, :cluster_environment_type, :cluster_content_type)).paginate(page: params[:page], per_page: 20)

end

private

def set_cluster_config

@cluster_config = ClusterConfig.find(params[:id])

end

def cluster_config_params

params.require(:cluster_config).permit(:cluster_status_id, :cluster_environment_type_id, :cluster_content_type_id, :url_rest_service, :db_host, :db_port, :db_name, :dt_created, :dt_delivered, :obs)

end

2.4. Implement filter on index viewer

# vim app/views/cluster_configs/index.html.erb

<h3>Filter by:</h3>

<%= form_for cluster_configs_path do %>

<div>

Id: <%= text_field_tag 'cluster_config', '' %>

Status Massa: <%= select("cluster_status", "cluster_status", ClusterStatus.all.map {|a| [a.cluster_status, a.id] }, { include_blank: true }) %>

Environment Type: <%= select("cluster_environment_type", "cluster_environment_type", ClusterEnvironmentType.all.map {|a| [a.cluster_environment_type, a.id] }, { include_blank: true }) %>

Content Type: <%= select("cluster_content_type", "cluster_content_type", ClusterContentType.all.map {|a| [a.cluster_content_type, a.id] }, { include_blank: true }) %>

<%= submit_tag 'Filter' %>

</div>

<% end %>

2.5. Erro

Error when "Filter" submit button

ActionController::ParameterMissing in ClusterConfigsController#create

param is missing or the value is empty: cluster_config

Extracted source (around line #73):

72: def cluster_config_params

73: params.require(:cluster_config).permit(:cluster_status_id, :cluster_environment_type_id, :cluster_content_type_id, :url_rest_service, :db_host, :db_port, :db_name, :dt_created, :dt_delivered, :obs)

74: end

Request

Parameters:

{"utf8"=>"✓",

"authenticity_token"=>"BF22bYvS/UXHOgeLLXeindCqWeXj41w/MxPE93cNoLBnaGwMhdC+HOuvvc6TCoteFHTsyyCZsoxO2j0kA4q/yA==",

"cluster_config"=>"",

"cluster_status"=>{"cluster_status"=>""},

"cluster_environment_type"=>{"cluster_environment_type"=>""},

"cluster_content_type"=>{"cluster_content_type"=>""},

"commit"=>"Filter"}