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Hash host ID so its stable and well distributed #2884

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merged 1 commit into from
Apr 12, 2017
+12 −0
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Hash host ID so its stable and well distributed #2884

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12 changes: 12 additions & 0 deletions command/agent/agent.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package agent

import (
"crypto/sha512"
"encoding/json"
"errors"
"fmt"
Expand Down Expand Up @@ -645,6 +646,17 @@ func (a *Agent) makeNodeID() (string, error) {
return a.makeRandomID()
}

// Hash the input to make it well distributed. The reported Host UUID may be
// similar across nodes if they are on a cloud provider or on motherboards
// created from the same batch.
buf := sha512.Sum512([]byte(id))
id = fmt.Sprintf("%08x-%04x-%04x-%04x-%12x",
buf[0:4],
buf[4:6],
buf[6:8],
buf[8:10],
buf[10:16])

a.logger.Printf("[DEBUG] Using unique ID %q from host as node ID", id)
return id, nil
}
Expand Down