Merge pull request #341 from detiber/sdodson-etcd-playbook

External clustered etcd support

6 files changed, 196 insertions, 0 deletions

diff --git a/roles/etcd/README.md b/roles/etcd/README.md
new file mode 100644
index 000000000..49207c428
--- /dev/null
+++ b/roles/etcd/README.md
@@ -0,0 +1,39 @@
+Role Name
+=========
+
+Configures an etcd cluster for an arbitrary number of hosts
+
+Requirements
+------------
+
+This role assumes it's being deployed on a RHEL/Fedora based host with package
+named 'etcd' available via yum.
+
+Role Variables
+--------------
+
+TODO
+
+Dependencies
+------------
+
+None
+
+Example Playbook
+----------------
+
+    - hosts: etcd
+      roles:
+         - { etcd }
+
+License
+-------
+
+MIT
+
+Author Information
+------------------
+
+Scott Dodson <sdodson@redhat.com>
+Adapted from https://github.com/retr0h/ansible-etcd for use on RHEL/Fedora. We
+should at some point submit a PR to merge this with that module.
diff --git a/roles/etcd/defaults/main.yaml b/roles/etcd/defaults/main.yaml
new file mode 100644
index 000000000..0fb45f37c
--- /dev/null
+++ b/roles/etcd/defaults/main.yaml
@@ -0,0 +1,31 @@
+---
+etcd_interface: eth0
+etcd_client_port: 2379
+etcd_peer_port: 2380
+etcd_peers_group: etcd
+etcd_url_scheme: http
+etcd_peer_url_scheme: http
+etcd_conf_dir: /etc/etcd
+etcd_ca_file: "{{ etcd_conf_dir }}/ca.crt"
+etcd_cert_file: "{{ etcd_conf_dir }}/server.crt"
+etcd_key_file: "{{ etcd_conf_dir }}/server.key"
+etcd_peer_ca_file: "{{ etcd_conf_dir }}/ca.crt"
+etcd_peer_cert_file: "{{ etcd_conf_dir }}/peer.crt"
+etcd_peer_key_file: "{{ etcd_conf_dir }}/peer.key"
+
+etcd_initial_cluster_state: new
+etcd_initial_cluster_token: etcd-cluster-1
+
+etcd_initial_advertise_peer_urls: "{{ etcd_peer_url_scheme }}://{{ hostvars[inventory_hostname]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_peer_port }}"
+etcd_listen_peer_urls: "{{ etcd_peer_url_scheme }}://{{ hostvars[inventory_hostname]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_peer_port }}"
+etcd_advertise_client_urls: "{{ etcd_url_scheme }}://{{ hostvars[inventory_hostname]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_client_port }}"
+etcd_listen_client_urls: "{{ etcd_url_scheme }}://{{ hostvars[inventory_hostname]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_client_port }}"
+
+etcd_data_dir: /var/lib/etcd/
+
+os_firewall_use_firewalld: False
+os_firewall_allow:
+- service: etcd
+  port: "{{etcd_client_port}}/tcp"
+- service: etcd peering
+  port: "{{ etcd_peer_port }}/tcp"
diff --git a/roles/etcd/handlers/main.yml b/roles/etcd/handlers/main.yml
new file mode 100644
index 000000000..b897913f9
--- /dev/null
+++ b/roles/etcd/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: restart etcd
+  service: name=etcd state=restarted
diff --git a/roles/etcd/meta/main.yml b/roles/etcd/meta/main.yml
new file mode 100644
index 000000000..82b1a62b8
--- /dev/null
+++ b/roles/etcd/meta/main.yml
@@ -0,0 +1,19 @@
+---
+# This module is based on https://github.com/retr0h/ansible-etcd with most
+# changes centered around installing from a pre-existing rpm
+# TODO: Extend https://github.com/retr0h/ansible-etcd rather than forking
+galaxy_info:
+  author: Scott Dodson
+  description: etcd management
+  company: Red Hat, Inc.
+  license: Apache License, Version 2.0
+  min_ansible_version: 1.2
+  platforms:
+  - name: EL
+    versions:
+    - 7
+  categories:
+  - cloud
+  - system
+dependencies:
+- { role: os_firewall }
diff --git a/roles/etcd/tasks/main.yml b/roles/etcd/tasks/main.yml
new file mode 100644
index 000000000..79a91dfde
--- /dev/null
+++ b/roles/etcd/tasks/main.yml
@@ -0,0 +1,52 @@
+---
+- name: Install etcd
+  yum: pkg=etcd state=present
+
+- name: Validate permissions on the config dir
+  file:
+    path: "{{ etcd_conf_dir }}"
+    state: directory
+    owner: etcd
+    group: etcd
+    mode: 0700
+
+- name: Validate permissions on certificate files
+  file:
+    path: "{{ item }}"
+    mode: 0600
+    group: etcd
+    owner: etcd
+  when: etcd_url_scheme == 'https'
+  with_items:
+  - "{{ etcd_ca_file }}"
+  - "{{ etcd_cert_file }}"
+  - "{{ etcd_key_file }}"
+
+- name: Validate permissions on peer certificate files
+  file:
+    path: "{{ item }}"
+    mode: 0600
+    group: etcd
+    owner: etcd
+  when: etcd_peer_url_scheme == 'https'
+  with_items:
+  - "{{ etcd_peer_ca_file }}"
+  - "{{ etcd_peer_cert_file }}"
+  - "{{ etcd_peer_key_file }}"
+
+- name: Write etcd global config file
+  template:
+    src: etcd.conf.j2
+    dest: /etc/etcd/etcd.conf
+  notify:
+    - restart etcd
+
+- name: Enable etcd
+  service:
+    name: etcd
+    state: started
+    enabled: yes
+  register: start_result
+
+- pause: seconds=30
+  when: start_result | changed
diff --git a/roles/etcd/templates/etcd.conf.j2 b/roles/etcd/templates/etcd.conf.j2
new file mode 100644
index 000000000..801be2c97
--- /dev/null
+++ b/roles/etcd/templates/etcd.conf.j2
@@ -0,0 +1,52 @@
+{% macro initial_cluster() -%}
+{% for host in groups[etcd_peers_group] -%}
+{% if loop.last -%}
+{{ host }}={{ etcd_peer_url_scheme }}://{{ hostvars[host]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_peer_port }}
+{%- else -%}
+{{ host }}={{ etcd_peer_url_scheme }}://{{ hostvars[host]['ansible_' + etcd_interface]['ipv4']['address'] }}:{{ etcd_peer_port }},
+{%- endif -%}
+{% endfor -%}
+{% endmacro -%}
+
+{% if groups[etcd_peers_group] and groups[etcd_peers_group] | length > 1 %}
+ETCD_NAME={{ inventory_hostname }}
+ETCD_LISTEN_PEER_URLS={{ etcd_listen_peer_urls }}
+{% else %}
+ETCD_NAME=default
+{% endif %}
+ETCD_DATA_DIR={{ etcd_data_dir }}
+#ETCD_SNAPSHOT_COUNTER="10000"
+#ETCD_HEARTBEAT_INTERVAL="100"
+#ETCD_ELECTION_TIMEOUT="1000"
+ETCD_LISTEN_CLIENT_URLS={{ etcd_listen_client_urls }}
+#ETCD_MAX_SNAPSHOTS="5"
+#ETCD_MAX_WALS="5"
+#ETCD_CORS=""
+
+{% if groups[etcd_peers_group] and groups[etcd_peers_group] | length > 1 %}
+#[cluster]
+ETCD_INITIAL_ADVERTISE_PEER_URLS={{ etcd_initial_advertise_peer_urls }}
+ETCD_INITIAL_CLUSTER={{ initial_cluster() }}
+ETCD_INITIAL_CLUSTER_STATE={{ etcd_initial_cluster_state }}
+ETCD_INITIAL_CLUSTER_TOKEN={{ etcd_initial_cluster_token }}
+#ETCD_DISCOVERY=""
+#ETCD_DISCOVERY_SRV=""
+#ETCD_DISCOVERY_FALLBACK="proxy"
+#ETCD_DISCOVERY_PROXY=""
+{% endif %}
+ETCD_ADVERTISE_CLIENT_URLS={{ etcd_advertise_client_urls }}
+
+#[proxy]
+#ETCD_PROXY="off"
+
+#[security]
+{% if etcd_url_scheme == 'https' -%}
+ETCD_CA_FILE={{ etcd_ca_file }}
+ETCD_CERT_FILE={{ etcd_cert_file }}
+ETCD_KEY_FILE={{ etcd_key_file }}
+{% endif -%}
+{% if etcd_peer_url_scheme == 'https' -%}
+ETCD_PEER_CA_FILE={{ etcd_peer_ca_file }}
+ETCD_PEER_CERT_FILE={{ etcd_peer_cert_file }}
+ETCD_PEER_KEY_FILE={{ etcd_peer_key_file }}
+{% endif -%}