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Red Hat Enterprise Linux で "fork failed: Resource temporarily unavailable" エラーが発生する理由

Solution Verified - Updated -

Issue

  • 以下のエラーが /var/log/secure に表示されます。
Nov 24 19:01:45 ext-f sshd2[23985]: fatal: setresuid 20054:Resource temporarily unavailable  
Nov 24 19:06:04 ext-f sshd2[28377]:Disconnecting: fork failed:Resource temporarily unavailable  
Nov 24 19:14:46 ext-f sshd2[4484]:Disconnecting: fork failed:Resource temporarily unavailable
  • または、以下のエラーが /var/log/messages に表示されます。
Nov 24 19:08:51 ext-f sshd[4243]: error: fork:Resource temporarily unavailable

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 4

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