Ansible 部署 Redis 主从

一、安装ansible服务工具

在安装服务之前先添加epel的yum源，因为ansible的安装依赖epel源

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curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum makecache
yum -y install ansible

ansible作为一款自动化软件工具，不需要修改配置文件就可以直接启动
ansible的目录结构：

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/etc/ansible/ansible.cfg    --- ansible服务配置文件
/etc/ansible/hosts          --- 主机清单文件   定义可以管理的主机信息
/etc/ansible/roles          --- 角色目录

二、创建roles角色目录

官方地址：

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https://docs.ansible.com/ansible/latest/user_guide/playbooks_reuse_roles.html

官方的目录定义：

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[root@master1 /etc/ansible/roles]# tree
.
├── nfs                   #角色名称
│   ├── files             #存放需要copy的文件
│   ├── handlers          #触发任务剧本
│   ├── tasks             #具体任务剧本
│   ├── templates         #模版文件
│   └── vars              #存放变量文件
1.创建目录

根据官方的目录规划，依次创建目录：

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mkdir redis_cluster
cd redis_cluster/
mkdir files handlers tasks templates vars
cd files/
mkdir redis_{63{79,80},cmd}
mkdir redis_63{79,80}/{conf,logs,pid}
2.将redis的二进制文件复制到redis_cmd目录下
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mkdir /opt/cluster/redis_cluster/src
cd /opt/cluster/redis_cluster/src
wget http://download.redis.io/releases/redis-5.0.7.tar.gz
tar xf  redis-5.0.7.tar.gz -C /opt/cluster/redis_cluster/

# 打包
cd /opt/cluster/redis_cluster/redis-5.0.7/src/
make
cp -a redis-benchmark redis-check-aof redis-check-rdb redis-cli redis-server /etc/ansible/roles/redis_cluster/files/redis_cmd/
3.生成ssh免交互
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# 产生公私密钥对（已经生成了）
ssh-keygen

# 将本地的公钥上传到远程服务器 (默认 22 ssh端口号，如需更改，添加 -p xxxx)	
使用 ssh-copy-id username@your-server-ip 命令

# 输入远程服务器的密码
4.编写主机清单
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vim /etc/ansible/hosts
...
[redis-cluster]
192.168.2.246
5.配置文件jinja模版
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vim /etc/ansible/roles/redis_cluster/templates/redis_6379.conf.j2

bind {{ansible_facts.eth0.ipv4.address}}
port 6379
daemonize yes
pidfile "/opt/cluster/redis_cluster/redis_6379/pid/redis_6379.pid"
logfile "/opt/cluster/redis_cluster/redis_6379/logs/redis_6379.log"
dbfilename "redis_6379.rdb"
dir "/data/cluster/redis_cluster/redis_6379/"
appendonly yes
appendfilename "redis.aof"
appendfsync everysec
cluster-enabled yes
cluster-config-file nodes_6379.conf
cluster-node-timeout 15000
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vim /etc/ansible/roles/redis_cluster/templates/redis_6380.conf.j2
bind {{ansible_facts.eth0.ipv4.address}}
port 6380
daemonize yes
pidfile "/opt/cluster/redis_cluster/redis_6380/pid/redis_6380.pid"
logfile "/opt/cluster/redis_cluster/redis_6380/logs/redis_6380.log"
dbfilename "redis_6380.rdb"
dir "/data/cluster/redis_cluster/redis_6380/"
appendonly yes
appendfilename "redis.aof"
appendfsync everysec
cluster-enabled yes
cluster-config-file nodes_6380.conf
cluster-node-timeout 15000
6.配置启动脚本
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vim /etc/ansible/roles/redis_cluster/templates/redis-master.service.j2

[Unit]
Description=Redis persistent key-value database
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/redis-server /opt/cluster/redis_cluster/redis_6379/conf/redis_6379.conf --supervised systemd
ExecStop=/usr/local/bin/redis-cli -h {{ansible_facts.eth0.ipv4.address }}  -p 6379 shutdown
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
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vim /etc/ansible/roles/redis_cluster/templates/redis-slave.service.j2

[Unit]
Description=Redis persistent key-value database
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/redis-server /opt/cluster/redis_cluster/redis_6380/conf/redis_6380.conf --supervised systemd
ExecStop=/usr/local/bin/redis-cli -h {{ ansible_facts.eth0.ipv4.address}}  -p 6380 shutdown
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
7.tasks清单
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vim /etc/ansible/roles/redis_cluster/tasks/main.yaml

  - name: 01-create_group
    group:
      name: redis
      gid: 777

  - name: 02-create_user
    user:
      name: redis
      group: redis
      uid: 777
      shell: /sbin/nologin
      create_home: no

  - name: 03_copy_cmd
    copy:
      src: redis_cmd/
      dest: /usr/local/bin/
      mode: '0755'

  - name: 04_copy_conf
    copy:
      src: "{{ item }}"
      dest: /opt/cluster/redis_cluster/
      owner: redis
      group: redis
    loop:
      - redis_6380
      - redis_6379

  - name: 05_create_data
    file:
      dest: "/data/cluster/redis_cluster/{{ item }}"
      state: directory
      owner: redis
      group: redis
    loop:
      - redis_6379
      - redis_6380

  - name: 06_copy_conf
#    ignore_errors: yes
    template:
      src: "{{ item.src }}"
      dest: "{{ item.dest }}"
      backup: yes
    with_items:
      - { src: 'redis_6379.conf.j2', dest: '/opt/cluster/redis_cluster/redis_6379/conf/redis_6379.conf' }
      - { src: 'redis_6380.conf.j2', dest: '/opt/cluster/redis_cluster/redis_6380/conf/redis_6380.conf' }
      - { src: 'redis-master.service.j2', dest: '/usr/lib/systemd/system/redis-master.service' }
      - { src: 'redis-slave.service.j2', dest: '/usr/lib/systemd/system/redis-slave.service' }

  - name: 07_start_redis_service
    ignore_errors: yes
    systemd:
      name: "{{ item }}"
      state: started
      daemon_reload: yes
    loop:
      - redis-master
      - redis-slave
    notify:
      - restart redis-master
      - restart redis-slave
8.handles清单
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vim /etc/ansible/roles/redis_cluster/handlers/main.yaml
- name: restart redis-master
  service:
    name: redis-master
    state: restarted
- name: restart redis-slave
  service:
    name: redis-slave
    state: restarted
9.执行任务清单
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vim /etc/ansible/redis_cluster.yaml
- hosts: redis-cluster
  roles:
    - redis_cluster
10.检查剧本语法
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ansible-playbook --syntax-check /etc/ansible/redis_cluster.yaml
11.模拟执行剧本
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ansible-playbook -C /etc/ansible/redis_cluster.yaml
12.执行剧本
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ansible-playbook /etc/ansible/redis_cluster.yaml