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full task cleanup when alloc prerun hook fails (#17104)
to avoid leaking task resources (e.g. containers, iptables) if allocRunner prerun fails during restore on client restart. now if prerun fails, TaskRunner.MarkFailedKill() will only emit an event, mark the task as failed, and cancel the tr's killCtx, so then ar.runTasks() -> tr.Run() can take care of the actual cleanup. removed from (formerly) tr.MarkFailedDead(), now handled by tr.Run(): * set task state as dead * save task runner local state * task stop hooks also done in tr.Run() now that it's not skipped: * handleKill() to kill tasks while respecting their shutdown delay, and retrying as needed * also includes task preKill hooks * clearDriverHandle() to destroy the task and associated resources * task exited hooks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| ```release-note:bug | ||
| client: clean up resources upon failure to restore task during client restart | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright (c) HashiCorp, Inc. | ||
| // SPDX-License-Identifier: MPL-2.0 | ||
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| // FailHook is designed to fail for testing purposes, | ||
| // so should never be included in a release. | ||
| //go:build !release | ||
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| package allocrunner | ||
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| import ( | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
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| "github.com/hashicorp/go-hclog" | ||
| "github.com/hashicorp/hcl/v2/hclsimple" | ||
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| "github.com/hashicorp/nomad/client/allocrunner/interfaces" | ||
| ) | ||
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| var ErrFailHookError = errors.New("failed successfully") | ||
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| func NewFailHook(l hclog.Logger, name string) *FailHook { | ||
| return &FailHook{ | ||
| name: name, | ||
| logger: l.Named(name), | ||
| } | ||
| } | ||
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| type FailHook struct { | ||
| name string | ||
| logger hclog.Logger | ||
| Fail struct { | ||
| Prerun bool `hcl:"prerun,optional"` | ||
| PreKill bool `hcl:"prekill,optional"` | ||
| Postrun bool `hcl:"postrun,optional"` | ||
| Destroy bool `hcl:"destroy,optional"` | ||
| Update bool `hcl:"update,optional"` | ||
| PreTaskRestart bool `hcl:"pretaskrestart,optional"` | ||
| Shutdown bool `hcl:"shutdown,optional"` | ||
| } | ||
| } | ||
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| func (h *FailHook) Name() string { | ||
| return h.name | ||
| } | ||
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| func (h *FailHook) LoadConfig(path string) *FailHook { | ||
| if _, err := os.Stat(path); os.IsNotExist(err) { | ||
| h.logger.Error("couldn't load config", "error", err) | ||
| return h | ||
| } | ||
| if err := hclsimple.DecodeFile(path, nil, &h.Fail); err != nil { | ||
| h.logger.Error("error parsing config", "path", path, "error", err) | ||
| } | ||
| return h | ||
| } | ||
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| var _ interfaces.RunnerPrerunHook = &FailHook{} | ||
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| func (h *FailHook) Prerun() error { | ||
| if h.Fail.Prerun { | ||
| return fmt.Errorf("prerun %w", ErrFailHookError) | ||
| } | ||
| return nil | ||
| } | ||
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| var _ interfaces.RunnerPreKillHook = &FailHook{} | ||
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| func (h *FailHook) PreKill() { | ||
| if h.Fail.PreKill { | ||
| h.logger.Error("prekill", "error", ErrFailHookError) | ||
| } | ||
| } | ||
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| var _ interfaces.RunnerPostrunHook = &FailHook{} | ||
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| func (h *FailHook) Postrun() error { | ||
| if h.Fail.Postrun { | ||
| return fmt.Errorf("postrun %w", ErrFailHookError) | ||
| } | ||
| return nil | ||
| } | ||
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| var _ interfaces.RunnerDestroyHook = &FailHook{} | ||
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| func (h *FailHook) Destroy() error { | ||
| if h.Fail.Destroy { | ||
| return fmt.Errorf("destroy %w", ErrFailHookError) | ||
| } | ||
| return nil | ||
| } | ||
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| var _ interfaces.RunnerUpdateHook = &FailHook{} | ||
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| func (h *FailHook) Update(request *interfaces.RunnerUpdateRequest) error { | ||
| if h.Fail.Update { | ||
| return fmt.Errorf("update %w", ErrFailHookError) | ||
| } | ||
| return nil | ||
| } | ||
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| var _ interfaces.RunnerTaskRestartHook = &FailHook{} | ||
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| func (h *FailHook) PreTaskRestart() error { | ||
| if h.Fail.PreTaskRestart { | ||
| return fmt.Errorf("destroy %w", ErrFailHookError) | ||
| } | ||
| return nil | ||
| } | ||
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| var _ interfaces.ShutdownHook = &FailHook{} | ||
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| func (h *FailHook) Shutdown() { | ||
| if h.Fail.Shutdown { | ||
| h.logger.Error("shutdown", "error", ErrFailHookError) | ||
| } | ||
| } |
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