CentOS 5.1 - 서버가 혼자서 리부팅되는 현상

얼마전 사내 웹서버로 CentOS 5.1 로 구축하여 사용하고 있습니다.

파일서버를 NFS묶어서 사용하는데, 주기적으로 몇일에 한번씩 서버가 혼자 재부팅되는 현상이 발생하고 있습니다.

서버H/W도 구입한지 얼마안된상태라 참으로 난감하네요.

/var/log/message 를 보면 리부팅전

May 26 19:35:20 www syslogd 1.4.1: restart.
May 26 19:35:20 www kernel: klogd 1.4.1, log source = /proc/kmsg started.
May 26 19:35:20 www kernel: Linux version 2.6.18-53.1.14.el5xen (mockbuild@builder6.centos.org) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Wed Mar 5 12:39:19 EST 2008
May 26 19:35:20 www kernel: BIOS-provided physical RAM map:
May 26 19:35:20 www kernel:  Xen: 0000000000000000 - 0000000388652000 (usable)
May 26 19:35:20 www kernel: 13742MB HIGHMEM available.
May 26 19:35:20 www kernel: 727MB LOWMEM available.
May 26 19:35:20 www kernel: NX (Execute Disable) protection: active
May 26 19:35:20 www kernel: found SMP MP-table at 000fd190
May 26 19:35:20 www kernel: DMI 2.5 present.
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x01] lapic_id[0x02] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x02] lapic_id[0x04] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x03] lapic_id[0x06] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x04] lapic_id[0x01] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x05] lapic_id[0x03] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x06] lapic_id[0x05] enabled)
May 26 19:35:20 www kernel: ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)

이런 로그가 찍혀 있네요.

혹시 이런문제로 고민해 보셨던분께 도움요청합니다.ㅜㅜ