服务器突然对 SSH 失去响应，我上次报告过这种情况这里大约 2 个月前，我在另一台服务器上安装了该软件。该服务器的设置是 CentOS6 64 位，它运行一个非常基本的 apache2 服务器，该服务器提供静态文件，并且负载应该很小，因为它位于缓存量很大的 Amazon CloudFront 后面。
有人告诉我要仔细查看，/var/log/messages但是当我打开它查看问题发生的时间（2012 年 2 月 27 日 18:00 左右）时，那里有很多消息，我不知道它们是什么意思，谷歌搜索也没有太大帮助，所以我想知道是否有更有经验的人可以看看这个日志，并告诉我他们是否发现任何奇怪的事情。
Feb 26 03:06:02 173 kernel: imklog 4.6.2, log source = /proc/kmsg started.
Feb 26 03:06:02 173 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1439" x-info="http://www.rsyslog.com"] (re)start
Feb 26 04:20:01 173 auditd[1414]: Audit daemon rotating log files
Feb 26 13:37:09 173 auditd[1414]: Audit daemon rotating log files
Feb 27 08:03:03 173 auditd[1414]: Audit daemon rotating log files
Feb 27 18:35:13 173 init: tty (/dev/tty2) main process (1958) killed by TERM signal
Feb 27 18:35:13 173 init: tty (/dev/tty3) main process (1960) killed by TERM signal
Feb 27 18:35:13 173 init: tty (/dev/tty4) main process (1962) killed by TERM signal
Feb 27 18:35:13 173 init: tty (/dev/tty5) main process (1964) killed by TERM signal
Feb 27 18:35:13 173 init: tty (/dev/tty6) main process (1966) killed by TERM signal
Feb 27 18:35:15 173 qpidd[1893]: 2012-02-27 18:35:15 notice Shut down
Feb 27 18:35:16 173 abrtd: Got signal 15, exiting
Feb 27 18:35:20 173 acpid: exiting
Feb 27 18:35:20 173 init: Disconnected from system bus
Feb 27 18:35:20 173 rpcbind: rpcbind terminating on signal. Restart with "rpcbind -w"
Feb 27 18:35:20 173 console-kit-daemon[1982]: WARNING: no sender#012
Feb 27 18:35:20 173 auditd[1414]: The audit daemon is exiting.
Feb 27 18:35:20 173 kernel: type=1305 audit(1330389320.836:995029): audit_pid=0 old=1414 auid=4294967295 ses=4294967295 subj=system_u:system_r:auditd_t:s0 res=1
Feb 27 18:35:20 173 kernel: type=1305 audit(1330389320.936:995030): audit_enabled=0 old=1 auid=4294967295 ses=4294967295 subj=system_u:system_r:auditctl_t:s0 res=1
Feb 27 18:35:20 173 kernel: Kernel logging (proc) stopped.
Feb 27 18:35:20 173 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1439" x-info="http://www.rsyslog.com"] exiting on signal 15.
Feb 27 18:38:07 173 kernel: imklog 4.6.2, log source = /proc/kmsg started.
Feb 27 18:38:07 173 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1437" x-info="http://www.rsyslog.com"] (re)start
Feb 27 18:38:07 173 kernel: Initializing cgroup subsys cpuset
Feb 27 18:38:07 173 kernel: Initializing cgroup subsys cpu
Feb 27 18:38:07 173 kernel: Linux version 2.6.32-220.2.1.el6.x86_64 ([email protected]) (gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC) ) #1 SMP Fri Dec 23 02:21:33 CST 2011
Feb 27 18:38:07 173 kernel: Command line: ro root=/dev/mapper/vg_173-lv_root rd_LVM_LV=vg_173/lv_swap rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_173/lv_root rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM
Feb 27 18:38:07 173 kernel: KERNEL supported cpus:
Feb 27 18:38:07 173 kernel: Intel GenuineIntel
Feb 27 18:38:07 173 kernel: AMD AuthenticAMD
Feb 27 18:38:07 173 kernel: Centaur CentaurHauls
Feb 27 18:38:07 173 kernel: BIOS-provided physical RAM map:
Feb 27 18:38:07 173 kernel: BIOS-e820: 0000000000000000 - 000000000009b800 (usable)
Feb 27 18:38:07 173 kernel: BIOS-e820: 000000000009b800 - 00000000000a0000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 0000000000100000 - 00000000be7a8000 (usable)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000be7a8000 - 00000000be7f4000 (ACPI NVS)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000be7f4000 - 00000000be7fc000 (ACPI data)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000be7fc000 - 00000000bf47a000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf47a000 - 00000000bf47b000 (ACPI NVS)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf47b000 - 00000000bf48c000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf48c000 - 00000000bf48f000 (ACPI NVS)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf48f000 - 00000000bf4b0000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf4b0000 - 00000000bf4b2000 (usable)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf4b2000 - 00000000bf503000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf503000 - 00000000bf50d000 (ACPI NVS)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf50d000 - 00000000bf533000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf533000 - 00000000bf576000 (ACPI NVS)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000bf576000 - 00000000bf800000 (usable)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000fed1c000 - 00000000fed40000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
Feb 27 18:38:07 173 kernel: BIOS-e820: 0000000100000000 - 0000000240000000 (usable)
Feb 27 18:38:07 173 kernel: DMI 2.7 present.
Feb 27 18:38:07 173 kernel: SMBIOS version 2.7 @ 0xF0480
Feb 27 18:38:07 173 kernel: AMI BIOS detected: BIOS may corrupt low RAM, working around it.
Feb 27 18:38:07 173 kernel: last_pfn = 0x240000 max_arch_pfn = 0x400000000
Feb 27 18:38:07 173 kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Feb 27 18:38:07 173 kernel: total RAM covered: 8192M
Feb 27 18:38:07 173 kernel: Found optimal setting for mtrr clean up
Feb 27 18:38:07 173 kernel: gran_size: 64K chunk_size: 64K num_reg: 4 lose cover RAM: 0G
Feb 27 18:38:07 173 kernel: last_pfn = 0xbf800 max_arch_pfn = 0x400000000
Feb 27 18:38:07 173 kernel: init_memory_mapping: 0000000000000000-00000000bf800000
Feb 27 18:38:07 173 kernel: init_memory_mapping: 0000000100000000-0000000240000000
Feb 27 18:38:07 173 kernel: RAMDISK: 3711a000 - 37fef46f
Feb 27 18:38:07 173 kernel: ACPI: RSDP 00000000000f0450 00024 (v02 SUPERM)
Feb 27 18:38:07 173 kernel: ACPI: XSDT 00000000be7f4078 00074 (v01 SUPERM SMCI--MB 00000001 AMI 00010013)
Feb 27 18:38:07 173 kernel: ACPI: FACP 00000000be7faf40 000F4 (v04 SUPERM SMCI--MB 00000001 AMI 00010013)
Feb 27 18:38:07 173 kernel: ACPI: DSDT 00000000be7f4180 06DC0 (v02 SUPERM SMCI--MB 00000000 INTL 20051117)
Feb 27 18:38:07 173 kernel: ACPI: FACS 00000000bf50af80 00040
Feb 27 18:38:07 173 kernel: ACPI: APIC 00000000be7fb038 00092 (v03 SUPERM SMCI--MB 00000001 AMI 00010013)
Feb 27 18:38:07 173 kernel: ACPI: SSDT 00000000be7fb0d0 001D6 (v01 AMICPU PROC 00000001 MSFT 03000001)
Feb 27 18:38:07 173 kernel: ACPI: MCFG 00000000be7fb2a8 0003C (v01 SUPERM SMCI--MB 00000001 MSFT 00000097)
Feb 27 18:38:07 173 kernel: ACPI: HPET 00000000be7fb2e8 00038 (v01 SUPERM SMCI--MB 00000001 AMI. 00000004)
Feb 27 18:38:07 173 kernel: ACPI: SPMI 00000000be7fb320 00040 (v05 A M I OEMSPMI 00000000 AMI. 00000000)
Feb 27 18:38:07 173 kernel: ACPI: EINJ 00000000be7fb360 00130 (v01 AMI AMI EINJ 00000000 00000000)
Feb 27 18:38:07 173 kernel: ACPI: ERST 00000000be7fb490 00210 (v01 AMIER AMI ERST 00000000 00000000)
Feb 27 18:38:07 173 kernel: ACPI: HEST 00000000be7fb6a0 000A8 (v01 AMI AMI HEST 00000000 00000000)
Feb 27 18:38:07 173 kernel: ACPI: BERT 00000000be7fb748 00030 (v01 AMI AMI BERT 00000000 00000000)
Feb 27 18:38:07 173 kernel: No NUMA configuration found
Feb 27 18:38:07 173 kernel: Faking a node at 0000000000000000-0000000240000000
Feb 27 18:38:07 173 kernel: Bootmem setup node 0 0000000000000000-0000000240000000
Feb 27 18:38:07 173 kernel: NODE_DATA [0000000000017000 - 000000000004afff]
Feb 27 18:38:07 173 kernel: bootmap [000000000004b000 - 0000000000092fff] pages 48
Feb 27 18:38:07 173 kernel: (8 early reservations) ==> bootmem [0000000000 - 0240000000]
Feb 27 18:38:07 173 kernel: #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
Feb 27 18:38:07 173 kernel: #1 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 - 0000008000]
Feb 27 18:38:07 173 kernel: #2 [0001000000 - 000200c7e4] TEXT DATA BSS ==> [0001000000 - 000200c7e4]
Feb 27 18:38:07 173 kernel: #3 [003711a000 - 0037fef46f] RAMDISK ==> [003711a000 - 0037fef46f]
Feb 27 18:38:07 173 kernel: #4 [000009b800 - 0000100000] BIOS reserved ==> [000009b800 - 0000100000]
Feb 27 18:38:07 173 kernel: #5 [000200d000 - 000200d3a8] BRK ==> [000200d000 - 000200d3a8]
Feb 27 18:38:07 173 kernel: #6 [0000010000 - 0000012000] PGTABLE ==> [0000010000 - 0000012000]
Feb 27 18:38:07 173 kernel: #7 [0000012000 - 0000017000] PGTABLE ==> [0000012000 - 0000017000]
Feb 27 18:38:07 173 kernel: found SMP MP-table at [ffff8800000fcdc0] fcdc0
Feb 27 18:38:07 173 kernel: Reserving 129MB of memory at 48MB for crashkernel (System RAM: 9216MB)
Feb 27 18:38:07 173 kernel: Zone PFN ranges:
Feb 27 18:38:07 173 kernel: DMA 0x00000010 -> 0x00001000
Feb 27 18:38:07 173 kernel: DMA32 0x00001000 -> 0x00100000
Feb 27 18:38:07 173 kernel: Normal 0x00100000 -> 0x00240000
Feb 27 18:38:07 173 kernel: Movable zone start PFN for each node
Feb 27 18:38:07 173 kernel: early_node_map[5] active PFN ranges
Feb 27 18:38:07 173 kernel: 0: 0x00000010 -> 0x0000009b
Feb 27 18:38:07 173 kernel: 0: 0x00000100 -> 0x000be7a8
Feb 27 18:38:07 173 kernel: 0: 0x000bf4b0 -> 0x000bf4b2
Feb 27 18:38:07 173 kernel: 0: 0x000bf576 -> 0x000bf800
Feb 27 18:38:07 173 kernel: 0: 0x00100000 -> 0x00240000
Feb 27 18:38:07 173 kernel: ACPI: PM-Timer IO Port: 0x408
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x03] lapic_id[0x04] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x05] lapic_id[0x01] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x06] lapic_id[0x03] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x07] lapic_id[0x05] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC (acpi_id[0x08] lapic_id[0x07] enabled)
Feb 27 18:38:07 173 kernel: ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
Feb 27 18:38:07 173 kernel: ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
Feb 27 18:38:07 173 kernel: IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-23
Feb 27 18:38:07 173 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
Feb 27 18:38:07 173 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
Feb 27 18:38:07 173 kernel: Using ACPI (MADT) for SMP configuration information
Feb 27 18:38:07 173 kernel: ACPI: HPET id: 0x8086a701 base: 0xfed00000
Feb 27 18:38:07 173 kernel: SMP: Allowing 8 CPUs, 0 hotplug CPUs
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 000000000009b000 - 000000000009c000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 000000000009c000 - 00000000000a0000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000000a0000 - 00000000000e0000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000000e0000 - 0000000000100000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000be7a8000 - 00000000be7f4000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000be7f4000 - 00000000be7fc000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000be7fc000 - 00000000bf47a000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf47a000 - 00000000bf47b000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf47b000 - 00000000bf48c000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf48c000 - 00000000bf48f000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf48f000 - 00000000bf4b0000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf4b2000 - 00000000bf503000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf503000 - 00000000bf50d000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf50d000 - 00000000bf533000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf533000 - 00000000bf576000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000bf800000 - 00000000fed1c000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000fed1c000 - 00000000fed40000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000fed40000 - 00000000ff000000
Feb 27 18:38:07 173 kernel: PM: Registered nosave memory: 00000000ff000000 - 0000000100000000
Feb 27 18:38:07 173 kernel: Allocating PCI resources starting at bf800000 (gap: bf800000:3f51c000)
还有更多，但我无法在这里分享，因为每篇帖子有 30,000 个字符的限制。
编辑 ： 像上次，事件发生时我的多包裹接收数量激增。
04:20:01 PM eth1 82.02 84.18 13.40 93.86 0.00 0.00 0.00
04:30:01 PM lo 0.03 0.03 0.00 0.00 0.00 0.00 0.00
04:30:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
04:30:01 PM eth1 72.94 74.44 7.29 86.59 0.00 0.00 0.00
04:40:01 PM lo 0.01 0.01 0.00 0.00 0.00 0.00 0.00
04:40:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
04:40:01 PM eth1 77.25 83.17 6.75 99.82 0.00 0.00 0.00
04:50:01 PM lo 0.01 0.01 0.00 0.00 0.00 0.00 0.00
04:50:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
04:50:01 PM eth1 71.76 77.19 6.24 91.93 0.00 0.00 0.00
05:00:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:00:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:00:01 PM eth1 64.39 63.84 8.28 71.20 0.00 0.00 0.00
05:10:01 PM lo 0.03 0.03 0.00 0.00 0.00 0.00 0.00
05:10:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:10:01 PM eth1 65.18 66.56 5.77 76.39 0.00 0.00 0.00
05:20:01 PM lo 0.03 0.03 0.00 0.00 0.00 0.00 0.00
05:20:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:20:01 PM eth1 92.23 89.68 33.78 88.57 0.00 0.00 0.00
05:30:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:30:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:30:01 PM eth1 73.42 74.93 8.05 87.59 0.00 0.00 0.00
05:40:01 PM lo 0.03 0.03 0.00 0.00 0.00 0.00 0.00
05:40:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:40:01 PM eth1 60.54 58.69 19.79 59.61 0.00 0.00 507865361.98
05:50:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:50:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:50:01 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 2146553474.33
06:00:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:00:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:00:01 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 2150279010.21
06:00:01 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
06:10:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:10:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:10:01 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 2145874241.82
06:20:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:20:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:20:01 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 2150063723.97
06:30:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:30:01 PM eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:30:01 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 2146303180.75
Average: lo 0.01 0.01 0.00 0.00 0.00 0.00 0.00
Average: eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average: eth1 122.77 119.70 24.14 84.60 0.00 0.00 101305280.31
06:38:02 PM LINUX RESTART
06:40:01 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
06:50:01 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00
编辑： /var/log/secure从事件发生时起：
Feb 27 18:35:15 173 runuser: pam_unix(runuser:session): session opened for user qpidd by (uid=0)
Feb 27 18:35:15 173 runuser: pam_unix(runuser:session): session closed for user qpidd
Feb 27 18:35:16 173 sshd[1774]: Received signal 15; terminating.
Feb 27 18:35:16 173 sshd[5490]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[5500]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[5500]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[5490]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[5510]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[5520]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[5510]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[5520]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[23046]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[23056]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[23066]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[23046]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[23056]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[23066]: pam_unix(sshd:session): session closed for user root
Feb 27 18:35:16 173 sshd[23076]: Exiting on signal 15
Feb 27 18:35:16 173 sshd[23076]: pam_unix(sshd:session): session closed for user root
Feb 27 18:38:19 173 sshd[5112]: Server listening on 0.0.0.0 port 22.
Feb 27 18:38:19 173 sshd[5112]: Server listening on :: port 22.
Feb 27 18:38:20 173 runuser: pam_unix(runuser:session): session opened for user qpidd by (uid=0)
Feb 27 18:38:20 173 runuser: pam_unix(runuser:session): session closed for user qpidd
Feb 27 18:38:20 173 runuser: pam_unix(runuser:session): session opened for user qpidd by (uid=0)
Feb 27 18:38:20 173 runuser: pam_unix(runuser:session): session closed for user qpidd
Feb 27 18:38:20 173 runuser: pam_unix(runuser-l:session): session opened for user qpidd by (uid=0)
Feb 27 18:38:20 173 runuser: pam_unix(runuser-l:session): session closed for user qpidd
Feb 27 18:38:34 173 sshd[5349]: Accepted publickey for root from MY IP port 40702 ssh2
Feb 27 18:38:34 173 sshd[5349]: pam_unix(sshd:session): session opened for user root by (uid=0)
Feb 27 18:40:57 173 sshd[5349]: Received disconnect from MY IP: 11: disconnected by user
Feb 27 18:40:57 173 sshd[5349]: pam_unix(sshd:session): session closed for user root
因此，当我事件发生后第一次尝试连接时，它似乎会接受我的公钥，但没有响应。
答案1
检查 /var/log/secure - 如果有很多次失败尝试，sshd 可能被挂起
如果是这种情况，你可能需要转到基于密钥的身份验证或安装类似 Deny Hosts 的东西