使用时的Ansible剧本

Question

- name: restart dcache if mem low
  hosts: test
  tasks:
  - name: getMem
    shell: /bin/bash /etc/zabbix/shell/MonitorMem.sh
    register: memNum
  - name: restart dcache if mem low
    shell: killall -9 dcache
    when: memNum < 3

MonitorMem.sh returns a num(an integer) that represents free memory,I want to use when to decide whether execute restart action. but every time I run the playbook.it will skip restart action. please give me a hand, thanks in advance.

Answer 1

The shell module's documentation provides the structure of the return values and the key point is that it returns a data structure (dict) that contains, amongst other things, the "standard out" (output) of the shell command. The stdout is found in the stdout attribute of the returned dictionary. The stdout_lines attribute contains the same, but with each line as a separate array entry.

I added also a int jinja filter to convert the string value to an integer.

- name: restart dcache if mem low
  hosts: test

  tasks:
  - name: getMem
    shell: /bin/bash /etc/zabbix/shell/MonitorMem.sh
    register: memNum

  - name: restart dcache if mem low
    shell: killall -9 dcache
    when: memNum.stdout|int < 3