Ansible Role: etcd

安装etcd

介绍

etcd是一个高可用的键值存储系统，主要用于共享配置和服务发现。etcd是由CoreOS开发并维护的，灵感来自于 ZooKeeper 和 Doozer，它使用Go语言编写，并通过Raft一致性算法处理日志复制以保证强一致性。Raft是一个来自Stanford的新的一致性算法，适用于分布式系统的日志复制，Raft通过选举的方式来实现一致性，在Raft中，任何一个节点都可能成为Leader。Google的容器集群管理系统Kubernetes、开源PaaS平台Cloud Foundry和CoreOS的Fleet都广泛使用了etcd。

官方地址： https://coreos.com/etcd/
github: https://github.com/coreos/etcd
官方文档地址：https://coreos.com/etcd/docs/latest

要求

此角色仅在RHEL及其衍生产品上运行。

测试环境

ansible 2.2.1.0
os Centos 6.7 X64

角色变量

software_files_path: "/opt/software"
software_install_path: "/usr/local"

etcd_version: "3.1.3"

etcd_file: "etcd-v{{ etcd_version }}-linux-amd64.tar.gz"
etcd_file_path: "{{ software_files_path }}/{{ etcd_file }}"
etcd_file_url: "https://github.com/coreos/etcd/releases/download/etcd-v{{ etcd_version }}/{{ etcd_file }}"

etcd_port: 2379
etcd_peer_port: 2380
etcd_home: "/etcd_data"
etcd_datadir: "{{ etcd_home }}/{% if etcd_port != 2379 %}{{ etcd_port }}/{% endif %}data"
etcd_wardir: "{{ etcd_home }}/{% if etcd_port != 2379 %}{{ etcd_port }}/{% endif %}war"

etcd_name: "infra0"
etcd_initial_advertise_peer_urls: "http://{{ ansible_default_ipv4.address }}:{{ etcd_peer_port }}"
etcd_listen_peer_urls: "http://{{ ansible_default_ipv4.address }}:{{ etcd_peer_port }}"
etcd_listen_client_urls: "http://{{ ansible_default_ipv4.address }}:{{ etcd_port }},http://127.0.0.1:{{ etcd_port }}"
etcd_advertise_client_urls: "http://{{ ansible_default_ipv4.address }}:{{ etcd_port }}"

etcd_trusted_ca_file: false
etcd_cert_file: false
etcd_key_file: false
etcd_peer_trusted_ca_file: false
etcd_peer_cert_file: false
etcd_peer_key_file: false

etcd_auto_tls: false

etcd_discovery: false
etcd_initial_cluster: false
etcd_initial_cluster_token: "etcd_cluster_1"

etcd_proxy: false

etcd_force_new_cluster: false
etcd_debug: false

依赖

go

github地址

https://github.com/kuailemy123/Ansible-roles/tree/master/etcd

Example Playbook

安装etcd，默认端口2379：
- hosts: node1
  roles:
   - { role: etcd }

单机伪集群安装：

- hosts: node1
  vars:
   - etcd_initial_cluster: "infra0=http://192.168.77.129:2380,infra1=http://192.168.77.129:2480,infra2=http://192.168.77.129:2580"
  roles:
    - { role: etcd, etcd_name: "infra0", etcd_port: 2379, etcd_peer_port: 2380}
    - { role: etcd, etcd_name: "infra1", etcd_port: 2479, etcd_peer_port: 2480}
    - { role: etcd, etcd_name: "infra2", etcd_port: 2579, etcd_peer_port: 2580}


分布式安装：
端口默认
- hosts: 192.168.77.129 192.168.77.130 192.168.77.131
  vars:
   - etcd_initial_cluster: "infra0=http://192.168.77.129:2380,infra1=http://192.168.77.130:2380,infra2=http://192.168.77.131:2380"
   - supervisor_name: etcd
   - supervisor_program:
     - { name: 'etcd', command: '/usr/local/bin/etcd --config-file /etcd_data/data/etcd.conf' }

  roles:
   - { role: etcd, etcd_name: "infra0" }
   - { role: python2.7 }
   - { role: supervisor }

- hosts: 192.168.77.130
  vars:
   - etcd_initial_cluster: "infra0=http://192.168.77.129:2380,infra1=http://192.168.77.130:2380,infra2=http://192.168.77.131:2380"
   - supervisor_name: etcd
   - supervisor_program:
     - { name: 'etcd', command: '/usr/local/bin/etcd --config-file /etcd_data/data/etcd.conf' }
  roles:
   - { role: etcd, etcd_name: "infra1" }
   - { role: python2.7 }
   - { role: supervisor }      
   
- hosts: 192.168.77.131
  vars:
   - etcd_initial_cluster: "infra0=http://192.168.77.129:2380,infra1=http://192.168.77.130:2380,infra2=http://192.168.77.131:2380"
   - supervisor_name: etcd
   - supervisor_program:
     - { name: 'etcd', command: '/usr/local/bin/etcd --config-file /etcd_data/data/etcd.conf' }
  roles:
   - { role: etcd, etcd_name: "infra2" }
   - { role: python2.7 }
   - { role: supervisor }

使用

启动命令： etcd --config-file /etcd_data/data/etcd.conf