cron

# cron
定时任务模块，逻辑与crontab完全相同

## 配置一个定时任务执行脚本
```yaml
- name: 配置定时任务
  cron:
    name: "Monitor mongodb" # 定时任务的名称，一定要填写，方便删除。
    env: "DB=test" # 配置环境变量,没有需要不用添加
    user: root     # 指定运行定时任务的用户
    minute: "*/1"  # 默认为"*"，不修改可以不写，( 0-59, *, */2, etc )
    hour: "*"      # 默认为"*"，不修改可以不写，( 0-23, *, */2, etc )
    day: "*"       # 默认为"*"，不修改可以不写，( 1-31, *, */2, etc )
    month: "*"     # 默认为"*"，不修改可以不写，( 1-12, *, */2, etc )
    weekday: "*"   # 默认为"*"，不修改可以不写，( 0-6 for Sunday-Saturday, *, etc )
    reboot: false  # 默认为false，不修改可以不写，reboot后执行的任务
    job: "/bin/bash /src/ddns/aliddns.sh > /tmp/mongo_monit.log 2>&1"
    state: present # 默认为present，如果要删除指定的任务可以修改为absent
```

## 帮助文档
`ansible-doc cron`

```yaml
EXAMPLES:

- name: Ensure a job that runs at 2 and 5 exists. Creates an entry like "0 5,2 * * ls -alh > /dev/null"
  cron:
    name: "check dirs"
    minute: "0"
    hour: "5,2"
    job: "ls -alh > /dev/null"

- name: 'Ensure an old job is no longer present. Removes any job that is prefixed by "#Ansible: an old job" from the crontab'
  cron:
    name: "an old job"
    state: absent

- name: Creates an entry like "@reboot /some/job.sh"
  cron:
    name: "a job for reboot"
    special_time: reboot
    job: "/some/job.sh"

- name: Creates an entry like "PATH=/opt/bin" on top of crontab
  cron:
    name: PATH
    env: yes
    job: /opt/bin

- name: Creates an entry like "APP_HOME=/srv/app" and insert it after PATH declaration
  cron:
    name: APP_HOME
    env: yes
    job: /srv/app
    insertafter: PATH

- name: Creates a cron file under /etc/cron.d
  cron:
    name: yum autoupdate
    weekday: "2"
    minute: "0"
    hour: "12"
    user: root
    job: "YUMINTERACTIVE=0 /usr/sbin/yum-autoupdate"
    cron_file: ansible_yum-autoupdate

- name: Removes a cron file from under /etc/cron.d
  cron:
    name: "yum autoupdate"
    cron_file: ansible_yum-autoupdate
    state: absent

- name: Removes "APP_HOME" environment variable from crontab
  cron:
    name: APP_HOME
    env: yes
    state: absent
```