编写一个ansible部署redis集群的脚本

好的，下面是一个简单的Ansible Playbook，用来部署Redis集群：

---
- name: Deploy Redis Cluster
  hosts: redis
  become: yes

  vars:
    redis_version: "6.2.5"
    redis_cluster_port: "6379"
    redis_cluster_config_file: "/etc/redis/redis.conf"
    redis_cluster_data_dir: "/var/lib/redis"
    redis_cluster_node_count: 6

  tasks:
    - name: Install Redis dependencies
      apt:
        name: "{{ item }}"
        state: present
      loop:
        - build-essential
        - tcl
        - libjemalloc-dev

    - name: Download and extract Redis
      get_url:
        url: "http://download.redis.io/releases/redis-{{ redis_version }}.tar.gz"
        dest: "/tmp/redis-{{ redis_version }}.tar.gz"

    - name: Extract Redis archive
      unarchive:
        src: "/tmp/redis-{{ redis_version }}.tar.gz"
        dest: "/tmp"
        remote_src: yes

    - name: Compile and install Redis
      shell: |
        cd /tmp/redis-{{ redis_version }}
        make
        make install

    - name: Create Redis configuration file
      template:
        src: "redis.conf.j2"
        dest: "{{ redis_cluster_config_file }}"
      vars:
        redis_cluster_port: "{{ redis_cluster_port }}"
        redis_cluster_data_dir: "{{ redis_cluster_data_dir }}"
        redis_cluster_node_count: "{{ redis_cluster_node_count }}"

    - name: Create Redis data directory
      file:
        path: "{{ redis_cluster_data_dir }}"
        state: directory

    - name: Start Redis instances
      shell: |
        cd /usr/local/bin
        redis-server {{ redis_cluster_config_file }}

此Playbook假设我们有一个名为"redis"的Ansible组，该组中的主机将运行Redis实例。它还假设我们将使用Redis 6.2.5版本，并创建一个6节点的Redis集群。

在此之前，我们需要编写一个名为"redis.conf.j2"的Jinja2模板文件，用于生成Redis配置文件。以下是示例模板文件：

port {{ redis_cluster_port }}
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes
dir {{ redis_cluster_data_dir }}
cluster-announce-ip {{ ansible_default_ipv4.address }}
cluster-announce-port {{ redis_cluster_port }}
{% for i in range(redis_cluster_node_count) %}
cluster-announce-bus-port {{ redis_cluster_port+10000+i }}
{% endfor %}

在运行此Playbook之前，请确保在Ansible的控制节点上安装了Jinja2和Redis依赖项。