新增role:高可用非持久化redis集群

+Redis
+=========
+
+安装Redis server(不持久化), 并使用twemproxy支持Redis高可用集群
+Redis 默认端口: 6379
+twemproxy 默认端口: 22121
+
+
+Author Information
+------------------
+tiexin.yang@yoho.cn

+---
+# handlers file for redis
+
+- name: stop redis
+  shell: /Data/local/redis/bin/redis-cli -h "{{ ansible_default_ipv4['address'] }}" -p 6379 shutdown
+  ignore_errors: True
+
+- name: start redis
+  shell: /Data/local/redis/bin/redis-server /Data/local/redis/conf/redis.conf
+
+- name: start nutcracker
+  shell: /Data/local/twemproxy/sbin/nutcracker -d -c /Data/local/twemproxy/conf/nutcracker.yml

+galaxy_info:
+  author: tiexin.yang@yoho.cn
+  description: install redis with twemproxy supported HA available
+  company: yohobuy.com
+
+  # If the issue tracker for your role is not on github, uncomment the
+  # next line and provide a value
+  # issue_tracker_url: http://example.com/issue/tracker
+
+  # Some suggested licenses:
+  # - BSD (default)
+  # - MIT
+  # - GPLv2
+  # - GPLv3
+  # - Apache
+  # - CC-BY
+  license: license (GPLv2, CC-BY, etc)
+
+  min_ansible_version: 1.2
+
+  # If this a Container Enabled role, provide the minimum Ansible Container version.
+  # min_ansible_container_version:
+
+  # Optionally specify the branch Galaxy will use when accessing the GitHub
+  # repo for this role. During role install, if no tags are available,
+  # Galaxy will use this branch. During import Galaxy will access files on
+  # this branch. If Travis integration is configured, only notifications for this
+  # branch will be accepted. Otherwise, in all cases, the repo's default branch
+  # (usually master) will be used.
+  #github_branch:
+
+  #
+  # platforms is a list of platforms, and each platform has a name and a list of versions.
+  #
+  # platforms:
+  # - name: Fedora
+  #   versions:
+  #   - all
+  #   - 25
+  # - name: SomePlatform
+  #   versions:
+  #   - all
+  #   - 1.0
+  #   - 7
+  #   - 99.99
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []
+  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
+  # if you add dependencies to this list.

+---
+# tasks file for redis-cluster
+
+# install redis server
+
+- name: Ensure libselinux-python is installed
+  yum:
+    name: libselinux-python
+    state: installed
+    update_cache: yes
+
+- name: Check if redis already installed
+  stat: path=/Data/local/redis/bin/redis-server
+  register: redis_binary
+
+- name: Upload redis source package
+  copy:
+    src: "redis-3.2.12.tar.gz"
+    dest: "/root/redis-3.2.12.tar.gz"
+    mode: 0755
+  when: redis_binary.stat.exists == False
+
+- name: Decompress and install redis
+  shell: cd /root/ && mkdir -p /Data/local/ && tar -zxvf redis-3.2.12.tar.gz && cd redis-3.2.12 && make && make PREFIX=/Data/local/redis install && mkdir -p /Data/local/redis/conf /Data/logs/redis/ /Data/local/redis/data
+  when: redis_binary.stat.exists == False
+
+- name: Update redis configuration file
+  template:
+    src: "redis.conf.j2"
+    dest: "/Data/local/redis/conf/redis.conf"
+  notify:
+    - start redis
+
+- name: Make sure autoconf268 utils installed
+  yum:
+    name: autoconf268,automake,libtool
+    state: installed
+    update_cache: yes
+
+- name: Check if twemproxy already installed
+  stat: path=/Data/local/twemproxy/sbin/nutcracker
+  register: nutcracker_binary
+  
+- name: Download latest twemproxy
+  git:
+    repo: https://github.com/twitter/twemproxy.git
+    dest: /root/twemproxy
+    accept_hostkey: true
+  when: nutcracker_binary.stat.exists == False
+
+- name: Install twemproxy
+  shell: cd /root/twemproxy && autoreconf268 -ivf && ./configure --prefix=/Data/local/twemproxy && make && make install && mkdir -p /Data/local/twemproxy/conf
+  when: nutcracker_binary.stat.exists == False
+
+- name: Update twemproxy configuration file
+  template:
+    src: "nutcracker.yml.j2"
+    dest: "/Data/local/twemproxy/conf/nutcracker.yml"
+  notify:
+    - start nutcracker

+alpha:
+  listen: 0.0.0.0:22121
+  hash: fnv1a_64
+  distribution: ketama
+  auto_eject_hosts: true
+  redis: true
+  server_retry_timeout: 2000
+  server_failure_limit: 2
+  servers:
+{%  for host in play_hosts %}
+   - {{ host }}:6379:1
+{% endfor %}

+daemonize yes
+pidfile /Data/local/redis/redis.pid
+bind "{{ ansible_default_ipv4['address'] }}"
+port 6379
+tcp-backlog 511
+timeout 300
+tcp-keepalive 60
+loglevel notice
+logfile "/Data/logs/redis/redis.log"
+databases 16
+save ""
+stop-writes-on-bgsave-error yes
+rdbcompression yes
+rdbchecksum yes
+dbfilename redis01.rdb
+dir /Data/local/redis/data
+slave-serve-stale-data yes
+slave-read-only yes
+repl-diskless-sync no
+repl-diskless-sync-delay 5
+repl-disable-tcp-nodelay no
+slave-priority 100
+maxclients 2048
+maxmemory {{ ansible_memtotal_mb*0.8 }}M
+appendonly no
+appendfilename "appendonly.aof"
+appendfsync everysec
+no-appendfsync-on-rewrite no
+auto-aof-rewrite-percentage 100
+auto-aof-rewrite-min-size 64mb
+aof-load-truncated yes
+lua-time-limit 5000
+slowlog-log-slower-than 10000
+slowlog-max-len 128
+latency-monitor-threshold 0
+notify-keyspace-events ""
+hash-max-ziplist-entries 512
+hash-max-ziplist-value 64
+list-max-ziplist-entries 512
+list-max-ziplist-value 64
+set-max-intset-entries 512
+zset-max-ziplist-entries 128
+zset-max-ziplist-value 64
+hll-sparse-max-bytes 3000
+activerehashing yes
+client-output-buffer-limit normal 0 0 0
+client-output-buffer-limit slave 256mb 64mb 60
+client-output-buffer-limit pubsub 32mb 8mb 60
+hz 10
+aof-rewrite-incremental-fsync yes