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standalone.xml
==============

Vim <jboss-eap-6>/jboss-7.1.1/standalone/configuration/standalone.xml
<subsystem xmlns="urn:jboss:domain:jmx:1.1">
   <show-model value="true"/>
   <remoting-connector/>
</subsystem>

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Parameters
==========

JVM_OPTS:

JBOSS_OPTS:
-Djboss.home.dir=/d2/java/jboss-eap-6.2  ($JBOSS_HOME)

-Djboss.server.base.dir=/d2/java/jboss-eap-6.2/asp264005 ($JBOSS_HOME/standalone)
-Djboss.server.default.config=standalone.xml                or   -c standalone.xml

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Java-Profiling
==============

  HEAP   
   -> | perm |  young   |          old          |
      perm -> Dados permanentes
      young -> Espaçco menor. Sofre muitas coletas do GC é mais rápido para executar. Não sofre compactação e os objetos são simplesmente copiados     para as outras áreas. Isso torma a coleta eficiente. É dividida em S0, S1 e Eden; Onde o S0 e S1 são áreas temporárias de objetos; A EDEN é onde os objetos são criados  pela primeira vez.
      old -> Espaçco maior e poucas coletas e o GC é mais demorada. 
      
  GC (Garbage Collector) is a form of automatic memory management. The garbage collector, or just collector, attempts to reclaim garbage, or memory occupied by objects that are no longer in use by the program. 

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DevOps
======
Gene Kim, autor do livro The Phoenix Project, realizou um debate com Steven Witkop, John Skovron e Elis Booker sobre 
como plataforma como serviço (PaaS) se encaixa no processo de DevOps. Elis Booker ajudou a discussão com perguntas 
sobre DevOps, derrubando mitos sobre nuvens privadas e como começar a utilizá-las.

Gene Kim descreveu a teoria das restrições e suas aplicação em DevOps; também indicou restrições em desenvolvimento de 
software que, segundo ele, devem ser abordadas em sequência:

    Provisionamento de ambientes/implantação;

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Example to install MySQL driver on DataSource JBoss EAP 6
=========================================================

First we will create a new module. A module in this sense is a package of classes that will be available to all our application through your JBoss node. This is a big differences compared with older JBoss version where all deployed archive where directly available to other deployed application when deployed in the deployment root folder.

You find module in $JBOSS_HOME/modules folder. To create a new module you need to do three things: 

    1 - Create a folder hierarchy for files.
        $ mkdir -p $JBOSS_HOME/modules/com/mysql/main
    2 - Copy module jar files.

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MySQL Machine 
=============

- COMMANDS

  mysqladmin -u root -p create prime
  mysql -uroot -p -e "GRANT ALL PRIVILEGES ON prime.* TO ’prime’@’%’ IDENTIFIED BY ’prime’;"
  mysql -u root -p -e "SHOW DATABASES"
  mysql -u loja -p loja_schema -e "select database(), user()"

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Kubernetes
==========   

Based on CoreOS: CoreOS is a powerful Linux distribution built to make large, scalable deployments on varied infrastructure simple to manage.
 - etcd: A toll to manage these clusters, CoreOS uses a globally distributed key-value store called etcd to pass configuration data between nodes. 
 - fleet: A tool to schedule and manage applications across the entirety of the cluster.

Based on Docker: Docker is a containerization system that utilizes LXC, also known as Linux containers, and uses kernel namespacing and cgroups in order to isolate processes.

Kubernetes, at its basic level, is a system for managing containerized applications across a cluster of nodes.

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Docker
======

https://docs.docker.com/v1.4/articles/systemd/

Architecture:
 - /var/lib/docker: (config containers)
 - /var/lib/docker/containers: (stated containers)
 - /var/lib/docker/graph: (commited images)

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COMMANDS RHEL 7
===============

=> SYSTEMCTL

systemctl list-units --type=service | grep running
systemctl list-units --type=service | grep failed
systemctl list-units --type=service

systemctl stop postfix.service

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Nginx
=====

NGINX is more then just a high performance web server, it is loaded with features. Here are just some of the features available:

    Support for multiple protocols: HTTP, HTTPS, SPDY, WebSocket, IMAP, POP3, SMTP
    Caching
    Compression
    SSL Termination: TLSv1.1/TLSv1.2/SSL/SNI/PFS/PCI-DSS and OCSP Stapling
    HTTP video streaming with MP4/FLV/HDS/HLS