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Ansible playbook when usage

- 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.

1 Answer
1

The shell documentation modules provides the structure of the return values, stdout contains the output of the executed command (and so is stdout_lines).

stdout

stdout_lines

I added also a filter to convert the 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


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