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Automatización de tareas con Ansible
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César Suárez Ortega
March 14, 2015
Programming
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Automatización de tareas con Ansible
César Suárez Ortega
March 14, 2015
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Transcript
Automatización de tareas con Seminario TheEvnt Preguntando a las ballenas
Devops con Ansible y Docker 13-14 Febrero (Cáceres)
csuarez César Suárez Ortega Software Engineer / Researcher tharandur
[email protected]
Software Engineer / Researcher César Suárez Ortega
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http://www.meetup.com/phpcaceres 24 de Marzo // 18:30 // 7 Jardines LESS
IS MORE By Juan José Galán (@Jgalanlo)
www.suicidebystar.com
HERRAMIENTAS DE AUTOMATIZACIÓN ¿PARA QUÉ VALEN?
DESPLIEGUE DE APLICACIONES CONTINOUS DELIVERY VIRTUALIZACIÓN CLOUDS VAGRANT GESTIÓN DE
CONFIGURACIONES DOCKER TEST HOMOGENEIZACIÓN
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Lenguaje Ruby DSL YAML YAML Agentless No No Sí Sí
Arquitectura Master/Slave Master/Slave Masterless Ambos Comunicación Propio Propio SSH ZeroMQ
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¿Por qué Ansible? ¥ “Radically simple” ¥ Agentless ¥ Pocos requisitos (python, OpenSSH,
…) ¥ Curva de aprendizaje escasa ¥ Configuración legible (YAML) ¥ Buena documentación ¥ http://docs.ansible.com/
Cualquiera es mejor que nada
ANSIBLE 101 Empezando con Ansible
Instalación $ sudo apt-get install software-properties-common! $ sudo apt-add-repository ppa:ansible/ansible!
$ sudo apt-get update! $ sudo apt-get install ansible! $ sudo yum install epel-release! $ sudo yum install ansible! $ brew update! $ brew install ansible! $ sudo pip install ansible! http://brew.sh/
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Inventories ¥ Inventario de máquinas ¥ Definición de nuestra infraestructura
¥ Formato INI ¥ Por defecto en /etc/ansible/hosts! ¥ Muchas vitaminas ¥ Grupos ¥ Rangos ¥ Parámetros ¥ … ¥ Inventories dinámicos
Inventories ! [webservers]! server1.company.com! server2.company.com! 188.234.123.12! ! [databases]! mysql-prod-[1:10].company.com! mysql-test-[a:f].company.com!
! [base]! dns.company.com ansible_ssh_user=root ansible_ssh_password=chapuza! dhcp.company.com ansible_conection=ssh! ! [storage]! ftp.company.com ftp_port=23! ! [misc]! some_alias ansible_ssh_host=134.23.42.123! !
$ ansible all -m command -a ”pwd” –f 10 -k
! $ ssh-keygen -t rsa -C "
[email protected]
"! ! $ cat ~/.ssh/id_rsa.pub | \! ssh <user>@<host> “cat >> .ssh/authorized_keys”! Confianza SSH o
Nuestro primer comando :) ¥ ansible: Comando! ¥ all: Parte del inventario
a usar.! ¥ -m command: Módulo ¥ -a "ls /tmp": Atributos del módulo $ ansible all -m command -a "ls /tmp”!
Más comandos $ ansible all -m copy -a "src=/tmp/foo dest=/tmp/foo"!
$ ansible webservers -m yum -a "name=php5 state=present"! $ ansible all -m command -a ”pwd” –f 10 ! $ ansible all -m command -a ”rm –rf /” –i custom_inventory!
PLAYBOOKS
Introducción a Playbooks ¥ Automatización de tareas complejas. ¥ Ficheros en formato
YAML. ¥ Definición de: ¥ Tareas ¥ Pasos ¥ Variables “Los módulos son las herramientas y los playbooks los planos”
YAML Ain’t Another Markup Language ---! - hosts: webservers! ..vars:!
....http_port: 80! ....max_clients: 200! ....remote_user: root! ..tasks:! ....- name: ensure apache is at the latest version! ......yum: pkg=httpd state=latest! ....- name: write the apache config file! ......template: src=/srv/httpd.j2 dest=/etc/httpd.conf! ....- name: ensure apache is running! ......service: name=httpd state=started!
---! - hosts: webservers! vars:! http_port: 80! max_clients: 200! remote_user:
root! tasks:! - name: ensure apache is at the latest version! yum: pkg=httpd state=latest! - name: write the apache config file! template: src=/srv/httpd.j2 dest=/etc/httpd.conf! - name: ensure apache is running! service: name=httpd state=started! ! ! $ ansible-playbook my-playbook.yml! ! !
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Módulos ¥ +200 incluidos por defecto ¥ Aceptan parámetros clave-valor: ¥ key1=value1,
key2=value2, key3=value3! ¥ Ídempotentes ¥ No se ejecutan si no hace falta. ¥ Documentación: $ ansible-doc <module_name>! http://docs.ansible.com/modules.html ! o
Manejo de ficheros template: src=www.conf dest=/etc/php-fpm.d/www.conf! copy: src=www.conf dest=/etc/php-fpm.d/www.conf! copy
template lineinfile: dest=/etc/foo regexp=^SELINUX= line=SELINUX=enforcing! lineinfile replace: dest=/foo regexp='(\s+)old(\s+.*)?$' replace='\1new\2’! replace
template [www]! ! listen = 127.0.0.1:9000! ! listen.allowed_clients = 127.0.0.1!
! user = {{ php_user }}! group = {{ php_group }}! ! pm = dynamic! pm.max_children = 50! pm.start_servers = 5! pm.min_spare_servers = 5! pm.max_spare_servers = 35! ! php_admin_value[error_log] = /var/log/php-fpm/www-error.log! php_admin_flag[log_errors] = on! ! php_value[session.save_handler] = files! php_value[session.save_path] = /var/lib/php/session!
Linux básico shell: chmod –R 777 /tmp! command: touch /tmp/foo!
command shell yum: name=php-fpm state=latest #present, absent, ...! yum / apt service: name=httpd state=stopped #started, restarted, ...! service
Miscelánea git: repo=https://github.com/WordPress/WordPress.git dest=/! mysql_db: name=db state=present login_user=root login_password=! mysql_db
git docker: image=foo/image_name links=postgresql:db,redis:redis! docker++ docker: image=centos command="service tomcat6 start" ports=8080! docker
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PLAYBOOKS++
Variables
Uso de variables ! ! ! ! ! ! ---!
- hosts: webservers! vars:! deploy_path: /var/www/html/current! base_packages: [php-fpm, mysql, nginx] ! tasks:! - name: deploy code! copy: src=local_wordpress/ dest={{ deploy_path }}! ! - name: copy wp-config! copy: src=config.php dest={{ deploy_path }}/wp-config.php! ! ! !
Filtros ! ! ! ! {{ random_variable | mandatory }}!
! ! {{ some_port | default(80) }}! ! ! {{ http_response | to_nice_json }}! ! ! {{ password | hash(‘md5’) }}! ! ! {{ something | regex_replace(‘!@#/”!!!’) }}! ! ! !
Facts ¥ Variables del “sistema”. ¥ Algunas ¥ ansible_hostname! ¥ ansible_kernal! ¥ ansible_eth0.ipv4.address! ¥ …! ¥ Obtener
todas: $ ansible all –m setup!
Condicionales
when ! ! ! ! ! ! ! - name:
”apagar sistema Debian”! command: /sbin/shutdown -t now! when: ansible_os_family == ”Debian” ! ! - shell: echo ”sistemas RedHat 6 o superiores"! when: ansible_os_family == "RedHat" ! and ansible_lsb.major_release|int >= 6! ! ! ! ! ! !
Filtros interesantes ! tasks:! ! - shell: /usr/bin/foo! register: result!
ignore_errors: True! ! - debug: msg=”¡falló!"! when: result|failed! ! - debug: msg=”¡cambió!"! when: result|changed! ! - debug: msg=”¡funcionó!"! when: result|success! ! - debug: msg=”¡se saltó!"! when: result|skipped! ! !
Loops
with_xxx vars:! php_packages: [php-xml, php-mysql, php-gd]! users:! user1:! nombre: Curro!
apellido: Rodríguez! user2:! nombre: Álvaro! apellido: De la Mata! ! tasks:! - name: Instalar paquetes PHP! yum: name={{ item }} state=latest! with_items: php_packages! ! - name: Imprimir nombres! debug: msg=“{{ item.key }}: {{ item.value.nombre }} {{ item.value.apellido }}"! with_dict: users! ! - name: Copiar ficheros! copy: src={{ item }} dest=/tmp/! with_fileglob:! - /home/user/*! ! !
Handlers
Handlers ¥ Lanzar acciones cuando un módulo cambia ---! - hosts:
webservers! vars:! http_port: 80! tasks:! - name: ensure apache is at the latest version! yum: pkg=httpd state=latest! - name: write the apache config file! template: src=/srv/httpd.j2 dest=/etc/httpd.conf! notify:! - restart apache! - name: ensure apache is running! service: name=httpd state=started! handlers:! - name: restart apache! service: name=httpd state=restarted!
Tags
! ! ---! - hosts: webservers! - tasks:! - name:
ensure apache is running! service: name=httpd state=started! tags:! - apache! - name: ensure php-fpm is running! service: name=php-fpm state=started! tags:! - php! ! ! $ ansible-playbook my-playbook.yml –-tags “php”! ! !
Includes
includes ! ! ! ! tasks:! ! - include: tasks/foo.yml!
! - include: wordpress.yml wp_user=timmy! - include: wordpress.yml wp_user=alice! - include: wordpress.yml wp_user=bob! ! - include: tasks/sometasks.yml! when: ansible_os_family == 'Debian’! ! ! ! ! ! !
ROLES
¿Qué son los roles? ¥ Organización de playbooks. ¥ “Convention over configuration”
¥ Carga automática de: ¥ Tasks ¥ Vars ¥ Handlers ¥ Dependencias ¥ Reutilizables
Estructura de roles ¥ some_role/! ¥ files/ * Ficheros para
copy ¥ templates/ * Ficheros para template ¥ tasks/ ¥ handlers/ ¥ vars/ ¥ defaults/ * Valores por defecto ¥ meta/ * Dependencias ---! - hosts: webservers! roles:! - some_role! ! !
http://github.com/csuarez/theevnt-ansible
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