2971b787ac
This change implements the machinectl quota system and qgroups when they're enabled and available. This change is being implemented to resolve an issue where machinectl based containers using a loopback file system spam DMESG with the following: * BTRFS error (device loop0): could not find root $INT While various upstream sources say this error is benign[0], it raises an inconsistency flag within the host system and is speculatively the cause of our inconsistent read-only/Full-FS issues we've seen in the integrated gate. Once the qgroups are properly setup the system will remove the inconsistency flag and the message spam will stop. * BTRFS info (device loop0): qgroup scan completed (inconsistency flag cleared) To resolve this issue the quota system is being enabled by default and unlimited qgroups are being setup to ensure we're not running into file system limitations. This change essentially acknowledges the built-in quota system and provides for the ability to set / define specific quota (qgroup) options as necessary. While many deployers may never use these options or this tooling, the role will now properly set everything up should it ever be needed. [0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651435 Closes-Bug: #1753790 Change-Id: I34a41ac8a9fe4419254284c83f4600efee274c04 Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>
45 lines
1.6 KiB
YAML
45 lines
1.6 KiB
YAML
---
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# Copyright 2016, Rackspace US, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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- name: Create base container to use for BTRFS-backed containers
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lxc_container:
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name: "{{ lxc_container_base_name }}"
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template: "download"
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state: stopped
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backing_store: "btrfs"
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template_options: "{{ lxc_cache_download_template_options }}"
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register: cache_download
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retries: 3
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delay: 10
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until: cache_download|success
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- name: Set the qgroup limits
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block:
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- name: Set the qgroup size|compression limits on machines
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command: "btrfs qgroup limit {{ item }} /var/lib/lxc/{{ lxc_container_base_name }}"
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changed_when: false
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with_items:
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- "-e {{ lxc_host_machine_qgroup_space_limit }}"
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- "-c {{ lxc_host_machine_qgroup_compression_limit }}"
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when:
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- not lxc_host_machine_quota_disabled
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rescue:
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- name: Notice regarding quota system
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debug:
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msg: >-
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There was an error processing the setup of qgroups. Check the system
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to ensure they're available otherwise disable the quota system by
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setting `lxc_host_machine_quota_disabled` to true.
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