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kevinveenbirkenbachandClaude Opus 5
fc16056c8b
`docker stack deploy` drops the per-service `runtime:` key, so a swarm worker
can only carry the sandbox as its daemon-wide `default-runtime`. That was never
set: the role reached the manager only, no node was labelled, and one of three
agent replicas executed model-generated code under plain runc.
Setting it from the base render is not possible either. The container role
writes `daemon.json` before the runtime binary exists, and dockerd refuses to
start when a runtime path does not resolve ("stat /usr/local/bin/runsc: no such
file or directory"). The role's own attempt to re-render afterwards was a silent
no-op, because `include_role: sys-svc-container` hits the
`run_once_sys_svc_container` guard.
Move the probes plus the render into `daemon_config.yml` and let the role
re-enter it via `tasks_from` after installing runsc. Only runtimes whose binary
the probe found are registered, and `default-runtime` is written only for a
present shim on a non-stack host, so the stack host keeps the shared kernel for
the platform's own services.
The placement constraint compares against a fixed literal because Docker
constraints have no presence test: label the node `kata-capable=true` rather
than with the runtime name, otherwise a Kata node fails a `== runsc`
comparison. Without a worker outside the stack host no node is eligible at all,
so refuse the deploy instead of leaving the service pending forever.
`select_runtime.yml` is gone: hermes and openclaw included it by absolute path
out of a foreign role, and one probe in the container role now serves every
consumer.
Verified live on a three node cluster: worker `DefaultRuntime=runsc`, both
workers labelled, manager unlabelled, service constrained, and the running
replica reports `runtime=runsc`.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
6 lines
151 B
YAML
6 lines
151 B
YAML
---
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KATA_SHIM_BINARY: /usr/bin/containerd-shim-kata-v2
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RUNSC_SHIM_BINARY: /usr/local/bin/runsc
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SANDBOX_NODE_LABEL: kata-capable
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SANDBOX_RUNTIME: runsc
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