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---
- hosts: undercloud
vars:
metadata:
name: Check the number of OpenStack processes on undercloud
description: >
The default settings for OpenStack is to run one process (heat-engine,
keystone, etc.) per CPU core. On a machine with a lot of cores this is
both unnecessary and can consume a significant amount of RAM, leading
to crashes due to OOMKiller.
groups:
- pre-deployment
max_process_count: 8
tasks:
- name: Collect the number of running processes per OpenStack service
command: pgrep -f -c {{ item }}
ignore_errors: yes
register: "process_count"
changed_when: False
with_items:
- heat-engine
- mistral
- ironic-inspector
- ironic-conductor
- nova-api
- nova-scheduler
- nova-conductor
- nova-compute
- glance-api
- swift-proxy-server
- swift-object-server
- swift-container-server
- zaqar-server
- name: Create warning messages
command: echo "There are {{ item.stdout }} {{ item.item }} processes running. Having more than {{ max_process_count }} risks running out of memory."
register: process_warnings
with_items: "{{ process_count.results }}"
when: "item.stdout|int > max_process_count"
- name: Output warning message
warn: msg={{ warning_msg }}
when: "warning_msg|length > 0"
vars:
warning_msg: "{{ process_warnings.results|selectattr('changed')|map(attribute='stdout')|join('\n') }}"