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Only allow one k0sctl to run simultaneously per host (#382)
* Only allow one k0sctl to run simultaneously per host Cant use configurer before detect OS Flock Wait a while No flock? Take a risk Seal window * Complete redo * Cleanup * Lint * Fall back to /tmp/k0sctl.lock if /run/lock does not exist
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| package phase | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| gos "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| retry "github.com/avast/retry-go" | ||
| "github.com/k0sproject/k0sctl/analytics" | ||
| "github.com/k0sproject/k0sctl/pkg/apis/k0sctl.k0sproject.io/v1beta1" | ||
| "github.com/k0sproject/k0sctl/pkg/apis/k0sctl.k0sproject.io/v1beta1/cluster" | ||
| "github.com/k0sproject/rig/exec" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // Lock acquires an exclusive k0sctl lock on hosts | ||
| type Lock struct { | ||
| GenericPhase | ||
| cfs []func() | ||
| instanceID string | ||
| m sync.Mutex | ||
| wg sync.WaitGroup | ||
| } | ||
|
|
||
| // Prepare the phase | ||
| func (p *Lock) Prepare(c *v1beta1.Cluster) error { | ||
| p.Config = c | ||
| mid, _ := analytics.MachineID() | ||
| p.instanceID = fmt.Sprintf("%s-%d", mid, gos.Getpid()) | ||
| return nil | ||
| } | ||
|
|
||
| // Title for the phase | ||
| func (p *Lock) Title() string { | ||
| return "Acquire exclusive host lock" | ||
| } | ||
|
|
||
| func (p *Lock) Cancel() { | ||
| p.m.Lock() | ||
| defer p.m.Unlock() | ||
| for _, f := range p.cfs { | ||
| f() | ||
| } | ||
| p.wg.Wait() | ||
| } | ||
|
|
||
| // Run the phase | ||
| func (p *Lock) Run() error { | ||
| if err := p.Config.Spec.Hosts.ParallelEach(p.startLock); err != nil { | ||
| return err | ||
| } | ||
| return p.Config.Spec.Hosts.ParallelEach(p.startTicker) | ||
| } | ||
|
|
||
| func (p *Lock) startTicker(h *cluster.Host) error { | ||
| p.wg.Add(1) | ||
| lfp := h.Configurer.K0sctlLockFilePath(h) | ||
| ticker := time.NewTicker(10 * time.Second) | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| p.m.Lock() | ||
| p.cfs = append(p.cfs, cancel) | ||
| p.m.Unlock() | ||
|
|
||
| go func() { | ||
| log.Debugf("%s: started periodic update of lock file %s timestamp", h, lfp) | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| if err := h.Configurer.Touch(h, lfp, time.Now(), exec.Sudo(h)); err != nil { | ||
| log.Warnf("%s: failed to touch lock file: %s", h, err) | ||
| } | ||
| case <-ctx.Done(): | ||
| log.Debugf("%s: stopped lock cycle, removing file", h) | ||
| if err := h.Configurer.DeleteFile(h, lfp); err != nil { | ||
| log.Warnf("%s: failed to remove host lock file: %s", h, err) | ||
| } | ||
| p.wg.Done() | ||
| return | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (p *Lock) startLock(h *cluster.Host) error { | ||
| return retry.Do( | ||
| func() error { | ||
| return p.tryLock(h) | ||
| }, | ||
| retry.OnRetry( | ||
| func(n uint, err error) { | ||
| log.Errorf("%s: attempt %d of %d.. trying to obtain a lock on host: %s", h, n+1, retries, err.Error()) | ||
| }, | ||
| ), | ||
| retry.DelayType(retry.CombineDelay(retry.FixedDelay, retry.RandomDelay)), | ||
| retry.MaxJitter(time.Second*2), | ||
| retry.Delay(time.Second*3), | ||
| retry.Attempts(5), | ||
| retry.LastErrorOnly(true), | ||
| ) | ||
| } | ||
|
|
||
| func (p *Lock) tryLock(h *cluster.Host) error { | ||
| lfp := h.Configurer.K0sctlLockFilePath(h) | ||
|
|
||
| if err := h.Configurer.UpsertFile(h, lfp, p.instanceID); err != nil { | ||
| stat, err := h.Configurer.Stat(h, lfp, exec.Sudo(h)) | ||
| if err != nil { | ||
| return fmt.Errorf("lock file disappeared: %w", err) | ||
| } | ||
| content, err := h.Configurer.ReadFile(h, lfp) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to read lock file: %w", err) | ||
| } | ||
| if content != p.instanceID { | ||
| if time.Since(stat.ModTime()) < 30*time.Second { | ||
| return fmt.Errorf("another instance of k0sctl is currently operating on the host") | ||
| } | ||
| _ = h.Configurer.DeleteFile(h, lfp) | ||
| return fmt.Errorf("removed existing expired lock file") | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package phase | ||
|
|
||
| import ( | ||
| "github.com/k0sproject/k0sctl/pkg/apis/k0sctl.k0sproject.io/v1beta1" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // Unlock acquires an exclusive k0sctl lock on hosts | ||
| type Unlock struct { | ||
| GenericPhase | ||
| Cancel func() | ||
| } | ||
|
|
||
| // Prepare the phase | ||
| func (p *Unlock) Prepare(c *v1beta1.Cluster) error { | ||
| p.Config = c | ||
| if p.Cancel == nil { | ||
| p.Cancel = func() { | ||
| log.Fatalf("cancel function not defined") | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Title for the phase | ||
| func (p *Unlock) Title() string { | ||
| return "Release exclusive host lock" | ||
| } | ||
|
|
||
| // Run the phase | ||
| func (p *Unlock) Run() error { | ||
| p.Cancel() | ||
| return nil | ||
| } |
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