ansible 添加 cron 任务

1. 找到相应的role, 假设以storm_nimbus为例，将要完成的任务脚本放在files目录下。
   例如：

   vim roles/storm_nimbus/files/storm-recovery

   
   #!/bin/bash
   
   
   service=storm-mesos
   
   if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 3 )); then
       echo "`date`: $service are running!!!"
   else
       echo "`date`: $service are starting..."
       systemctl start storm-mesos-nimbus
       systemctl start storm-ui
       systemctl start storm-drpc
       #上面三条也可以合成一条：
       #systemctl start storm-{mesos-nimbus,ui,drpc}
       echo "`date`: $service are started!"
   fi

2. 添加ansible task

       ---
       - name: Deploy storm recovery script
         copy: src=storm-recovery dest=/usr/bin/storm-recovery mode=0755
         tags: guard
   
       - name: Add cron job for storm recovery
         cron: name="storm recovery" job="/usr/bin/storm-recovery" minute=*/5 state=present
         tags: guard

3. 将该task任务加入到main.yml中 roles/storm_nimbus/tasks/main.yml

   - include: guard.yml