OPS-563: Add cassandra role

playbooks/roles/cassandra/LICENSE

+The MIT License
+
+Copyright (c) 2014 Pieterjan Vandaele
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

playbooks/roles/cassandra/README.md

+Heavily modified from...
+
+## ANXS - cassandra
+
+Ansible role which installs and configures Apache Cassandra.
+
+#### License
+
+This directory is licensed under the MIT License. See the LICENSE file for details.

playbooks/roles/cassandra/defaults/main.yml

+
+cassandra_version: "2.0.14"
+cassandra_source_url: "http://archive.apache.org/dist/cassandra/{{cassandra_version}}/apache-cassandra-{{cassandra_version}}-bin.tar.gz"
+
+# AFAIK there's no way to detect instance storage after the instaces has started.
+# Therefore, you MUST know the device names ahead of time.
+cassandra_ephemeral_disks: []
+#cassandra_ephemeral_disks: ["/dev/xvdb", "/dev/xvdc"]
+
+cassandra_data_dir_prefix: /var/lib/cassandra/data
+#should be parallel to cassandra_ephemeral_disks if there are any
+cassandra_data_dirs: ["data.1"]
+
+cassandra_user: "cassandra"
+cassandra_group: "cassandra"
+
+cassandra_home: "{{ COMMON_APP_DIR }}/{{cassandra_user}}"
+
+# cassandra.yaml basic configuration parameters
+cassandra_cluster_name: "Test Cluster"
+
+#Set this!
+cassandra_seeds: ["127.0.0.1"]
+
+#should eventually use EC2Snitch
+cassandra_snitch: "SimpleSnitch"
+
+#set this ONLY when initializing a new cluster with NO DATA
+cassandra_auto_bootstrap: true
+
+# For single-node locally-accessible deployments only! Otherwise, use:
+# cassandra_listen_address: ""
+cassandra_listen_address: localhost
\ No newline at end of file

playbooks/roles/cassandra/meta/main.yml

+# file: cassandra/meta/main.yml
+
+dependencies:
+  - common
+  - oraclejdk
\ No newline at end of file

playbooks/roles/cassandra/tasks/main.yml

+
+- name: Make sure the cassandra group is present
+  group:
+    name: "{{cassandra_group}}"
+    state: present
+
+- name: Make sure the cassandra user is present
+  user:
+    name: "{{cassandra_user}}"
+    group: "{{cassandra_group}}"
+    home: "{{cassandra_home}}"
+    createhome: yes
+    shell: /bin/false
+
+- name: Make sure the cassandra user home has correct permissions
+  file:
+    path: "{{cassandra_home}}"
+    owner: "{{cassandra_user}}"
+    group: "{{cassandra_group}}"
+
+- name: Unmount disks mounted to the wrong place
+  mount:
+    name: "{{ item[0].mount }}"
+    src: "{{ item[0].device }}"
+    fstype: "{{ item[0].fstype }}"
+    state: unmounted
+  when: item[1] == item[0].device and not item[0].mount.startswith(cassandra_data_dir_prefix)
+  with_nested:
+    - ansible_mounts
+    - cassandra_ephemeral_disks
+
+- name: Create data directories
+  file:
+    path: "{{ cassandra_data_dir_prefix }}/{{ item }}"
+    state: directory
+  with_items: cassandra_data_dirs
+
+- name: Mount ephemeral disks
+  mount:
+    name: "{{ cassandra_data_dir_prefix }}/{{ item.1 }}"
+    src: "{{ item.0 }}"
+    fstype: ext4
+    state: mounted
+  with_together: 
+    - cassandra_ephemeral_disks
+    - cassandra_data_dirs
+  when: cassandra_ephemeral_disks
+
+#Mounting a disk overlays its permissions
+- name: Set permissions on data dirs
+  file:
+    path: "{{ cassandra_data_dir_prefix }}/{{ item }}"
+    owner: "{{ cassandra_user }}"
+    group: "{{ cassandra_group }}"
+  with_items: cassandra_data_dirs
+
+- name: Add the datastax repository apt-key
+  apt_key:
+    url: "http://debian.datastax.com/debian/repo_key"
+    state: present
+
+- name: Add the datastax repository
+  apt_repository:
+    repo: "deb http://debian.datastax.com/community stable main"
+    state: present
+
+- name: Install the cassandra package
+  apt:
+    name: "cassandra={{ cassandra_version }}"
+    state: present
+    update_cache: yes
+
+- name: Update the cassandra configuration
+  template:
+    src: "{{item}}.j2"
+    dest: /etc/cassandra/{{item}}
+    owner: "{{cassandra_user}}"
+    group: "{{cassandra_group}}"
+    mode: 0644
+  with_items:
+    - "cassandra-env.sh"
+    - "cassandra.yaml"
+
+- name: restart cassandra
+  service:
+    name: cassandra
+    state: restarted