Day 27 - 范例动手做 - Ansible 安装 Time-series DB

今天是安装 Time-series DB，我们要安装的 DB 是我们先前示范过的 InfluxDB 和 Prometheus
InfluxDB 因为有提供 deb 所以安装起来比较简单，但 Prometheus 安装就稍微复杂了点，因为要手动复制档案进系统
我们一样拿之前写好的 Terraform 和 Ansible 档案来改，目录结构大概如下

.
├── ansible.cfg
├── deploy.yml
├── lxc.tf
├── main.tf
├── roles
│   ├── apt_upgrade
│   │   └── tasks
│   │       └── main.yml
│   ├── install_influxdb
│   │   └── tasks
│   │       └── main.yml
│   └── install_prometheus
│       ├── files
│       │   ├── prometheus
│       │   │   ├── console_libraries
│       │   │   │   ├── menu.lib
│       │   │   │   └── prom.lib
│       │   │   ├── consoles
│       │   │   │   ├── index.html.example
│       │   │   │   ├── node-cpu.html
│       │   │   │   ├── node-disk.html
│       │   │   │   ├── node.html
│       │   │   │   ├── node-overview.html
│       │   │   │   ├── prometheus.html
│       │   │   │   └── prometheus-overview.html
│       │   │   ├── LICENSE
│       │   │   ├── NOTICE
│       │   │   ├── prometheus
│       │   │   ├── prometheus.yml
│       │   │   └── promtool
│       │   └── prometheus.service
│       └── tasks
│           └── main.yml
└── terraform.tfvars

11 directories, 26 files

这里我们用的方式是在 Ansible 里放好 Prometheus 的档案，然後再透过 Ansible 复制进系统
此外我们在安装 InfluxDB 时也开了一个 Database，让 Telegraf 等等能写进 InfluxDB

# roles/install_influxdb/tasks/main.yml
---

- name: Install InfluxDB
  apt:
    deb: https://dl.influxdata.com/influxdb/releases/influxdb_1.8.2_amd64.deb
  tags:
    - influxdb

- name: Enable and start InfluxDB
  systemd:
    name: influxdb
    enabled: yes
    state: started
  tags:
    - influxdb

- name: Create database telegraf
  command: influx -execute 'CREATE DATABASE telegraf'
  tags:
    - influxdb

# roles/install_prometheus/tasks/main.yml

---

- name: Copy prometheus to /usr/local/bin
  copy:
    src: prometheus/prometheus
    dest: /usr/local/bin/prometheus
    owner: root
    group: root
    mode: '0755'
  tags:
    - prometheus

- name: Copy promtool to /usr/local/bin
  copy:
    src: prometheus/promtool
    dest: /usr/local/bin/promtool
    owner: root
    group: root
    mode: '0755'
  tags:
    - prometheus

- name: Create folder /etc/prometheus
  file:
    path: /etc/prometheus
    owner: root
    group: root
    mode: '0755'
    state: directory
  tags:
    - prometheus

- name: Copy console_libraries to /etc/prometheus
  copy:
    src: prometheus/console_libraries
    dest: /etc/prometheus
    owner: root
    group: root
  tags:
    - prometheus

- name: Copy consoles to /etc/prometheus
  copy:
    src: prometheus/consoles
    dest: /etc/prometheus
    owner: root
group: root
  tags:
    - prometheus

- name: Copy prometheus.yml to /etc/prometheus
  copy:
    src: prometheus/prometheus.yml
    dest: /etc/prometheus
    owner: root
    group: root
  tags:
    - prometheus

- name: Copy prometheus.service
  copy:
    src: prometheus.service
    dest: /etc/systemd/system/prometheus.service
    owner: root
    group: root
    mode: '0644'
  tags:
    - prometheus

- name: Systemd daemon-reload
  systemd:
    daemon_reload: yes
  tags:
    - prometheus

- name: Enable and start prometheus
  systemd:
    name: prometheus
    enabled: yes
    state: started
  tags:
    - prometheus

大概像这样，接下来一样是 terraform apply

装到现在，我们总共有三个容器

• app (放服务的)
• grafana (跑 Grafana 的)
• tsdb (放 Time-series DB 的)

明天，我们要把 Agent 塞进 app，让 TSDB 能吃到系统数据