ansible command模塊將返回值寫入變量

ansible 中command模塊支持 register參數將遠程命令執行的輸出結果存儲在變量中，后續可以在when中對該變量進行檢索確定下一步任務。

---
- name: cat /etc/redhat-release
  command: cat /etc/redhat-release
  register: output

- name: Your linux is CentOS
  command: echo "CentOS"
  when: output.stdout.find('CentOS') != -1