client: prevent start on cgroups init error #19915
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The Nomad client expects certain cgroups paths to exist in order to manage tasks. These paths are created when the agent first starts, but if process fails the agent would just log the error and proceed with its initialization, despite not being able to run tasks. This commit surfaces the errors back to the client initialization so the process can stop early and make clear to operators that something went wrong.
lgfa29
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Mar 27, 2024
PR hashicorp/nomad#19915 added an explicit error check to prevent silent failures when clients are unable to properly setup cgroups. This prevents `nomad-nodesim` jobs to start unless `/sys/fs/cgroup` is available for write inside the container. Since `nomad-nodesim` doesn't run real allocations, mounting the host path _should_ be fine (famous last words).
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The Nomad client expects certain cgroups paths to exist in order to manage tasks. These paths are created when the agent first starts, but if process fails the agent would just log the error and proceed with its initialization, despite not being able to run tasks.
This commit surfaces the errors back to the client initialization so the process can stop early and make clear to operators that something went wrong.
Closes #19847