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Disable discard_unpacked_layers for containerd >= 2.1 (#12821)

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Only set `discard_unpacked_layers` in the CRI image config for containerd
versions earlier than 2.1.0.

Starting with containerd v2.1, the CRI plugin uses the Transfer Service for
image pulls by default. The `discard_unpacked_layers` option is incompatible
with the Transfer Service and triggers containerd to fall back to local
image pulls, logging a warning.

This change prevents unsupported configuration from being applied on newer
containerd versions, avoiding runtime warnings and ensuring default image
pull behavior.

Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>
This commit is contained in:
Ali Afsharzadeh 2026-01-08 17:39:40 +03:30 committed by GitHub
parent 17c72367bc
commit 851abbc2e3
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2 changed files with 4 additions and 2 deletions
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4
roles/container-engine/containerd/defaults/main.yml
View File

@ -35,8 +35,8 @@ containerd_default_base_runtime_spec_patch:
hard: "{{ containerd_base_runtime_spec_rlimit_nofile }}"
soft: "{{ containerd_base_runtime_spec_rlimit_nofile }}"
# Can help reduce disk usage
# https://github.com/containerd/containerd/discussions/6295
# Only for containerd < 2.1; discard unpacked layers to save disk space
# https://github.com/containerd/containerd/blob/release/2.1/docs/cri/config.md#image-pull-configuration-since-containerd-v21
containerd_discard_unpacked_layers: true
containerd_base_runtime_specs:

2
roles/container-engine/containerd/templates/config.toml.j2
View File

@ -76,7 +76,9 @@ oom_score = {{ containerd_oom_score }}
[plugins."io.containerd.cri.v1.images"]
snapshotter = "{{ containerd_snapshotter }}"
{% if containerd_discard_unpacked_layers and containerd_version is version('2.1.0', '<') %}
discard_unpacked_layers = {{ containerd_discard_unpacked_layers | lower }}
{% endif %}
image_pull_progress_timeout = "{{ containerd_image_pull_progress_timeout }}"
[plugins."io.containerd.cri.v1.images".pinned_images]
sandbox = "{{ pod_infra_image_repo }}:{{ pod_infra_image_tag }}"