下面所有操作在 Ubuntu 18.04 中进行。
此 Ansible 的功能为构建 Redis 集群，会在每个目标主机中部署两个 Redis 实例，下面演示构建一个 3 节点 6 实例的 Redis 集群。
1、准备一台管理机执行如下操作安装 Ansible：
$ sudo apt update
$ sudo apt-get install software-properties-common
$ sudo apt-add-repository --yes ppa:ansible/ansible:2.7.6
$ sudo apt update
$ sudo apt-get install ansible2、 取消 Ansible 检查 Key ：
$ vim /etc/ansible/ansible.cfg
# 取消此行注释
host_key_checking = False3、克隆 Ansible Project：
$ git clone https://github.com/zze326/ansible-deploy-redis-cluster.git4、配置主机清单：
$ cd ansible-deploy-redis-cluster/
$ vim hosts.yml
all:
vars:
# SSH 用户
ansible_user: zze
# SSH 密码
ansible_ssh_pass: root1234
# sudo 提权密码
ansible_sudo_pass: root1234
# 编译好的 Redis 二进制文件目录，这里我提供 5.0.10 的下载链接：
# https://pan.baidu.com/s/1R5nDmpUqozVyu2hOD8kIeQ 提取码：kl7f
# 如果你需要使用其它版本的 Redis，可通过 http://download.redis.io/releases/ 下载源码包进行编译，默认 make install 后的二进制包放在了 /usr/local/bin 下，所以将 /usr/local/bin/redis-* 拷贝到下面 bin_dir 指定的目录即可
bin_dir: /opt/redis_bin
# 安装目录
install_dir: /opt/apps
# 主实例端口
master_port: 6379
# 从实例端口
slave_port: 6380
# Redis 密码
password: 123
# 集群副本数
cluster_replicas: 1
hosts: # 集群节点
10.1.30.12:
10.1.30.13:
10.1.30.41:上述配置会在
10.1.30.12、10.1.30.13和10.1.30.41中各安装两个 Redis 实例，Master 实例占用master_port指定的端口，Slave 实例占用slave_port指定的端口。
5、执行 Playbook，执行完成后会输出一个构建集群的命令，如下：
$ ansible-playbook -i hosts.yml run.yml
...
TASK [start_service : 打印构建 Redis 集群的命令] ****************************************************************************************************************************************************************************************
ok: [10.1.30.12] => {
"msg": "redis-cli -a 123 --cluster create 10.1.30.12:6379 10.1.30.13:6379 10.1.30.41:6379 10.1.30.12:6380 10.1.30.13:6380 10.1.30.41:6380 --cluster-replicas 1"
}
PLAY RECAP *********************************************************************************************************************************************************************************************************************
10.1.30.12 : ok=19 changed=8 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
10.1.30.13 : ok=18 changed=8 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
10.1.30.41 : ok=18 changed=8 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0 6、执行该命令构建集群关系：
$ redis-cli -a de2fae62fagag2fmjkgm --cluster create 10.1.30.12:6379 10.1.30.13:6379 10.1.30.41:6379 10.1.30.12:6380 10.1.30.13:6380 10.1.30.41:6380 --cluster-replicas 1
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 10.1.30.13:6380 to 10.1.30.12:6379
Adding replica 10.1.30.41:6380 to 10.1.30.13:6379
Adding replica 10.1.30.12:6380 to 10.1.30.41:6379
M: 20adb8e24d280e0c59bd0af65d8ef9a4da057e7c 10.1.30.12:6379
slots:[0-5460] (5461 slots) master
M: 2b8f8221e24201490d52d175950000eb915669d7 10.1.30.13:6379
slots:[5461-10922] (5462 slots) master
M: ac298b24c8e7e5b56255e14cfe705b0116113020 10.1.30.41:6379
slots:[10923-16383] (5461 slots) master
S: 787dc3f6521724b62b57b7c0aac209c3be2f7d2a 10.1.30.12:6380
replicates ac298b24c8e7e5b56255e14cfe705b0116113020
S: 2874f56d538cfaf26179093a89755dfb28122e54 10.1.30.13:6380
replicates 20adb8e24d280e0c59bd0af65d8ef9a4da057e7c
S: afcd5fb139c14c0a7429ba5e351551fbe22eb1ac 10.1.30.41:6380
replicates 2b8f8221e24201490d52d175950000eb915669d7
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
>>> Performing Cluster Check (using node 10.1.30.12:6379)
M: 20adb8e24d280e0c59bd0af65d8ef9a4da057e7c 10.1.30.12:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: ac298b24c8e7e5b56255e14cfe705b0116113020 10.1.30.41:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 787dc3f6521724b62b57b7c0aac209c3be2f7d2a 10.1.30.12:6380
slots: (0 slots) slave
replicates ac298b24c8e7e5b56255e14cfe705b0116113020
M: 2b8f8221e24201490d52d175950000eb915669d7 10.1.30.13:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 2874f56d538cfaf26179093a89755dfb28122e54 10.1.30.13:6380
slots: (0 slots) slave
replicates 20adb8e24d280e0c59bd0af65d8ef9a4da057e7c
S: afcd5fb139c14c0a7429ba5e351551fbe22eb1ac 10.1.30.41:6380
slots: (0 slots) slave
replicates 2b8f8221e24201490d52d175950000eb915669d7
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.7、检查集群节点关系：
$ redis-cli --cluster info 10.1.30.12:6379 -a 123
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.1.30.12:6379 (20adb8e2...) -> 0 keys | 5461 slots | 1 slaves.
10.1.30.41:6379 (ac298b24...) -> 0 keys | 5461 slots | 1 slaves.
10.1.30.13:6379 (2b8f8221...) -> 0 keys | 5462 slots | 1 slaves.
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