Sesión 6 : ansible

- name: servicio
  service:
    name: httpd
    state: started
  become: yes

- name: servicio
  service:
    name: httpd
    state: started
  become: yes
  become_user: apache

add-user.yaml

- hosts: all
  tasks:
    - include: add-user-debian.yaml
      when: ansible_os_family == 'Debian'
    - include: add-user-redhat.yaml
      when: ansible_os_family == 'RedHat'

add-user-debian.yaml

    - name: add user
      user:
        name: operador
        comment: nuestro usuario operador
        shell: /bin/bash
        home: /home/operador
        groups: sudo
        append: yes
      become: true

    - name: Set authorized key taken from file
      authorized_key:
        user: operador
        state: present
        key: "{{ lookup('file', '/home/devops/.ssh/id_ed25519.pub') }}"
      become: true

add-user-redhat.yaml

    - name: check centos correct suoders line
      lineinfile:
        path: /etc/sudoers
        state: present
        regexp: '^%wheel\s'
        line: '%wheel ALL=(ALL) NOPASSWD: ALL' 
      become: true
      when: ansible_os_family == 'RedHat'
    - name: add user
      user:
        name: operador
        comment: nuestro usuario operador
        shell: /bin/bash
        home: /home/operador
        groups: wheel
        append: yes
      become: true

    - name: Set authorized key taken from file
      authorized_key:
        user: operador
        state: present
        key: "{{ lookup('file', '/home/devops/.ssh/id_ed25519.pub') }}"
      become: true

otra-opcion.yaml

- hosts: "all"
  sudo: true
  vars:
    users:
    - "operador1"
    - "operador2"
    - "operador3"
  tasks:
  - name: "crear grupo operador"
    become: yes 
    group:
      name: operador
      state: present

  - name: "Create user accounts"
    user:
      name: "{{ item }}"
      groups: "operador"
    with_items: "{{ users }}"

  - name: "Add authorized keys"
    authorized_key:
      user: "{{ item }}"
      key: "{{ lookup('file', 'files/'+ item + '.pub') }}"    #   files/operador1.pub files/operador2.pub ...
    with_items: "{{ users }}"

  - name: "Allow admin users to sudo without a password"
    lineinfile:
      dest: "/etc/sudoers"
      state: "present"
      regexp: "^%operador"
      line: "%operador ALL=(ALL) NOPASSWD: ALL"
    become: yes

  - name: Install apache httpd but avoid starting it immediately (state=present is optional)
     package:
      name: httpd
     when: ansible_os_family == 'RedHat'
     become: yes

mysql-install.yaml

#        Ansible needs python-mysqldb
- name: Install MySQL
  apt: pkg={{item}} state=latest update_cache=false
  register: ispconfig_install_step1
  with_items:
    - pwgen
    - mysql-client
    - mysql-server
    - python-mysqldb
 
#        Requires a system with pwgen, included in our base system
- name: Generate MySQL Random Password
  command: /usr/bin/pwgen -s 16
  register: mysql_root_password

- name: update mysql root password for all root accounts
  mysql_user: name=root host={{ item }} password={{mysql_root_password.stdout}}  update_password=always state=present
  with_items:
    - "{{ inventory_hostname }}"
    - 127.0.0.1
    - ::1
    - localhost
  notify:
    - Restart MySQL

- name: copy my.cnf file with root password credentials to /root/.my.cnf
  template: src=my.cnf dest=/root/.my.cnf owner=root mode=0600

- name: Configure MySQL to listen on *:3306
  replace: dest=/etc/mysql/my.cnf regexp='bind-address' replace='#bind-address'

• https://docs.ansible.com/ansible/latest/modules/mysql_user_module.html?highlight=mysql

• https://docs.ansible.com/ansible/latest/user_guide/playbooks_reuse_roles.html#role-directory-structure
• https://github.com/kpeiruza/ansible

- hosts: all
  roles:
    - rol1
    - rol2
    - rol3

add-user-with-rol.yaml

- hosts: all
  roles:
    - add-user-rol

add-user-rol/tasks/main.yaml

- include: add-user-debian.yaml
  when: ansible_os_family == 'Debian'
- include: add-user-redhat.yaml
  when: ansible_os_family == 'RedHat'

add-user-rol/tasks/add-user-debian.yaml

- name: add user
  user:
    name: operador
    comment: nuestro usuario operador
    shell: /bin/bash
    home: /home/operador
    groups: sudo
    append: yes
  become: true

- name: Set authorized key taken from file
  authorized_key:
    user: operador
    state: present
# la clave pública en el directorio files del rol
    key: "{{ lookup('file', '{{ role_path }}/files/id_ed25519.pub') }}"
  become: true

add-user-rol/tasks/add-user-redhat.yaml

- name: check centos correct suoders line
  lineinfile:
    path: /etc/sudoers
    state: present
    regexp: '^%wheel\s'
    line: '%wheel ALL=(ALL) NOPASSWD: ALL' 
  become: true
  when: ansible_os_family == 'RedHat'
- name: add user
  user:
    name: operador
    comment: nuestro usuario operador
    shell: /bin/bash
    home: /home/operador
    groups: wheel
    append: yes
  become: true

- name: Set authorized key taken from file
  authorized_key:
    user: operador
    state: present
    key: "{{ lookup('file', lookup('env','HOME')+'/.ssh/id_ed25519.pub') }}"
  become: true

• HEAD : RAMA+COMMIT
• HEAD~2 : 2 commits atrás del HEAD actual
• comandos
  • git clone
  • git add .
  • git log
  • git commit [-m «mensaje»]
  • git push
  • git rm <fichero>
  • git tag <version o tag> <commit>
  • git checkout [-b] <rama> : crear o cambiar de rama
  • git diff <tag/commit> <commit> [<fichero>]
  • git init
  • git remote set-url origin <direccion>

instalar docker en máquinas de diferentes proveedores:

• máquina remota
• digital-ocean
• amazonec2

info:

• https://docs.docker.com/machine/
• https://docs.docker.com/machine/get-started/

comandos:

• docker-machine create –driver digitalocean –digitalocean-access-token xxxxx docker-sandbox
• docker-machine create –driver virtualbox default
• docker-machine create –driver amazonec2 –amazonec2-access-key AKI* –amazonec2-secret-key 8T93C* aws-sandbox

• docker-machine create \
    --driver generic \
    --generic-ip-address=203.0.113.81 \
    --generic-ssh-key ~/.ssh/id_rsa \
    vm

boot2docker.iso : imagen usada en el driver por defecto para lanzar un docker. Usada en windows/mac

https://docs.yugabyte.com/latest/deploy/docker-swarm/

• https://prometheus.io : motor de métricas
• monitoring stack
• federados + árbol
• alertar por umbrales → alertmanager
• recepción de métricas de monitorización → pushgateway
• se usa Grafana para acceder a los datos
• origen de las métricas:
  • node_exporter
  • cadvisor prometheus
  • docker metrics
• despliegue en docker swarm: https://github.com/stefanprodan/swarmprom

• cat /bin/bash > /dev/dsp
• https://ed25519.cr.yp.to/
• vim-nox
• no confirmar claves de sistemas remotos:

  ~/.ssh/config

  host *
      StrictHostKeyChecking no

• TICK : Telegraf + InfluxDB + Chronograf + Kapacitor

• https://hackertyper.net/