Add etcd role that builds out basic etcd cluster

- Add initial etcd role
- Add etcd playbook to create etcd client certs
- Hookup master to etcd

6 files changed, 149 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..f6281101f
--- /dev/null
+++ b/roles/etcd/defaults/main.yaml
@@ -0,0 +1,28 @@
+---
+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_ca_file: /etc/etcd/ca.crt
+etcd_cert_file: /etc/etcd/client.crt
+etcd_key_file: /etc/etcd/client.key
+etcd_peer_ca_file: /etc/etcd/ca.crt
+etcd_peer_cert_file: /etc/etcd/peer.crt
+etcd_peer_key_file: /etc/etcd/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_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..f952f84be
--- /dev/null
+++ b/roles/etcd/meta/main.yml
@@ -0,0 +1,17 @@
+---
+# 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
diff --git a/roles/etcd/tasks/main.yml b/roles/etcd/tasks/main.yml
new file mode 100644
index 000000000..8ed803119
--- /dev/null
+++ b/roles/etcd/tasks/main.yml
@@ -0,0 +1,16 @@
+---
+- name: Install etcd
+  yum: pkg=etcd state=present disable_gpg_check=yes
+
+- 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
diff --git a/roles/etcd/templates/etcd.conf.j2 b/roles/etcd/templates/etcd.conf.j2
new file mode 100644
index 000000000..5723b5089
--- /dev/null
+++ b/roles/etcd/templates/etcd.conf.j2
@@ -0,0 +1,46 @@
+{% 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 -%}
+
+ETCD_NAME={{ inventory_hostname }}
+ETCD_DATA_DIR={{ etcd_data_dir }}
+#ETCD_SNAPSHOT_COUNTER="10000"
+#ETCD_HEARTBEAT_INTERVAL="100"
+#ETCD_ELECTION_TIMEOUT="1000"
+ETCD_LISTEN_PEER_URLS={{ etcd_listen_peer_urls }}
+ETCD_LISTEN_CLIENT_URLS={{ etcd_listen_client_urls }}
+#ETCD_MAX_SNAPSHOTS="5"
+#ETCD_MAX_WALS="5"
+#ETCD_CORS=""
+#
+#[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_ADVERTISE_CLIENT_URLS={{ etcd_advertise_client_urls }}
+#ETCD_DISCOVERY=""
+#ETCD_DISCOVERY_SRV=""
+#ETCD_DISCOVERY_FALLBACK="proxy"
+#ETCD_DISCOVERY_PROXY=""
+#
+#[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 -%}