Add ansible provisioning (#122)

* first ansible skeleton

* first commit of ansible installation of vulnwhisperer outside docker

* first ansible skeleton

* first commit of ansible installation of vulnwhisperer outside docker

* refactor the ansible role a bit

* update readme, add fail validation step to provision.yml and fix
typo when calling a logging funciton

ansible/roles/elastic.elasticsearch/tasks/elasticsearch-RedHat.yml

@@ -0,0 +1,51 @@
+---
+- name: set fact allow_downgrade to no
+  set_fact: allow_downgrade=no
+
+- name: set fact allow_downgrade to yes
+  set_fact: allow_downgrade=yes
+  when: es_allow_downgrades
+
+- name: Ensure libselinux-python on CentOS 6.x
+  become: yes
+  yum: name=libselinux-python state=present update_cache=yes
+  when: ( ansible_distribution == "CentOS" ) and ( ansible_distribution_major_version == "6" )
+
+- name: RedHat - add Elasticsearch repo
+  become: yes
+  template: src=elasticsearch.repo dest=/etc/yum.repos.d/elasticsearch-{{ es_repo_name }}.repo
+  when: es_use_repository
+
+- name: RedHat - include versionlock
+  include: elasticsearch-RedHat-version-lock.yml
+  when: es_version_lock
+
+- name: RedHat - Remove non oss package if the old elasticsearch package is installed
+  become: yes
+  yum:
+    name: 'elasticsearch'
+    state: 'absent'
+  when: es_package_name == 'elasticsearch-oss'
+
+- name: RedHat - Install Elasticsearch
+  become: yes
+  yum:
+    name: '{{ es_package_name }}{% if es_version is defined and es_version != ""  %}-{{ es_version }}{% endif %}'
+    state: present
+    update_cache: yes
+    allow_downgrade: '{{ allow_downgrade }}'
+  when: es_use_repository
+  register: redhat_elasticsearch_install_from_repo
+  notify: restart elasticsearch
+  until: redhat_elasticsearch_install_from_repo.rc == 0
+  retries: 5
+  delay: 10
+  environment:
+    ES_PATH_CONF: "/etc/elasticsearch"
+
+- name: RedHat - Install Elasticsearch from url
+  become: yes
+  yum: name={% if es_custom_package_url is defined %}{{ es_custom_package_url }}{% else %}{{ es_package_url }}-{{ es_version }}.noarch.rpm{% endif %} state=present
+  when: not es_use_repository
+  register: elasticsearch_install_from_package
+  notify: restart elasticsearch