过去几天我一直在努力保持服务器正常运行。平均负载徘徊在 2 左右，峰值达到两位数，直到服务器崩溃。
我目前使用的是带有 WHM 和 Cpanel 的云 VPS：CENTOS 2.6.32-431.3.1.el6.x86_64 2G RAM 速度 2393.998 MHz 缓存 4096 KB Apache/2.4.7 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4 PHP 版本 5.4.23
我在服务器上运行以下 CMS：1 X Wordpress 1 x SMF Forum 1 x Drupal 7
MySQL 调整器结果：
MySQLTuner 1.2.0 - Major Hayden <[email protected]>
Bug reports, feature requests, and downloads at http://mysqltuner.com/
Run with '--help' for additional options and output filtering
-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.34-cll
[OK] Operating on 64-bit architecture
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 165M (Tables: 226)
[--] Data in InnoDB tables: 65M (Tables: 334)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 309
-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned
-------- Performance Metrics -------------------------------------------------
[--] Up for: 58m 57s (44K q [12.588 qps], 1K conn, TX: 84M, RX: 10M)
[--] Reads / Writes: 64% / 36%
[--] Total buffers: 210.0M global + 7.6M per thread (100 max threads)
[OK] Maximum possible memory usage: 972.5M (51% of installed RAM)
[OK] Slow queries: 0% (25/44K)
[OK] Highest usage of available connections: 11% (11/100)
[OK] Key buffer size / total MyISAM indexes: 24.0M/108.2M
[OK] Key buffer hit rate: 98.2% (261K cached / 4K reads)
[OK] Query cache efficiency: 70.1% (23K cached / 33K selects)
[!!] Query cache prunes per day: 57941
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 824 sorts)
[!!] Temporary tables created on disk: 41% (126 on disk / 302 total)
[OK] Thread cache hit rate: 97% (40 created / 1K connections)
[OK] Table cache hit rate: 95% (230 open / 241 opened)
[OK] Open file limit used: 6% (156/2K)
[OK] Table locks acquired immediately: 100% (25K immediate / 25K locks)
[OK] InnoDB data size / buffer pool: 65.4M/140.0M
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
When making adjustments, make tmp_table_size/max_heap_table_size equal
Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
query_cache_size (> 10M)
tmp_table_size (> 20M)
max_heap_table_size (> 20M)
我在我的消息日志中看到以下内容：
Jan 14 08:22:31 server1 kernel: Out of memory: Kill process 20781 (php) score 4 or sacrifice child
Jan 14 08:22:31 server1 kernel: Killed process 20781, UID 504, (php) total-vm:266888kB, anon-rss:3268kB, file-rss:1604kB
Jan 14 08:25:52 server1 kernel: php invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0, oom_score_adj=0
Jan 14 08:26:08 server1 kernel: php cpuset=/ mems_allowed=0
Jan 14 08:26:08 server1 kernel: Pid: 21549, comm: php Not tainted 2.6.32-431.3.1.el6.x86_64 #1
Jan 14 08:26:08 server1 kernel: Call Trace:
Jan 14 08:26:08 server1 kernel: [<ffffffff810d05c1>] ? cpuset_print_task_mems_allowed+0x91/0xb0
Jan 14 08:26:08 server1 kernel: [<ffffffff81122970>] ? dump_header+0x90/0x1b0
Jan 14 08:26:08 server1 kernel: [<ffffffff8122799c>] ? security_real_capable_noaudit+0x3c/0x70
Jan 14 08:26:08 server1 kernel: [<ffffffff81122df2>] ? oom_kill_process+0x82/0x2a0
Jan 14 08:26:08 server1 kernel: [<ffffffff81122d31>] ? select_bad_process+0xe1/0x120
Jan 14 08:26:08 server1 kernel: [<ffffffff81123230>] ? out_of_memory+0x220/0x3c0
Jan 14 08:26:08 server1 kernel: [<ffffffff8112fb4c>] ? __alloc_pages_nodemask+0x8ac/0x8d0
Jan 14 08:26:08 server1 kernel: [<ffffffff81167baa>] ? alloc_pages_vma+0x9a/0x150
Jan 14 08:26:08 server1 kernel: [<ffffffff8115b882>] ? read_swap_cache_async+0xf2/0x160
Jan 14 08:26:08 server1 kernel: [<ffffffff8115c3a9>] ? valid_swaphandles+0x69/0x150
Jan 14 08:26:08 server1 kernel: [<ffffffff8115b977>] ? swapin_readahead+0x87/0xc0
Jan 14 08:26:08 server1 kernel: [<ffffffff8114ac4d>] ? handle_pte_fault+0x6dd/0xb00
Jan 14 08:26:08 server1 kernel: [<ffffffff8104eeb7>] ? pte_alloc_one+0x37/0x50
Jan 14 08:26:08 server1 kernel: [<ffffffff8114b29a>] ? handle_mm_fault+0x22a/0x300
Jan 14 08:26:08 server1 kernel: [<ffffffff8114f336>] ? vma_adjust+0x556/0x5e0
Jan 14 08:26:08 server1 kernel: [<ffffffff8104a8d8>] ? __do_page_fault+0x138/0x480
Jan 14 08:26:08 server1 kernel: [<ffffffff8100988e>] ? __switch_to+0x26e/0x320
Jan 14 08:26:08 server1 kernel: [<ffffffff81527920>] ? thread_return+0x4e/0x76e
Jan 14 08:26:08 server1 kernel: [<ffffffff8103ea79>] ? kvm_clock_get_cycles+0x9/0x10
Jan 14 08:26:08 server1 kernel: [<ffffffff8152d46e>] ? do_page_fault+0x3e/0xa0
Jan 14 08:26:08 server1 kernel: [<ffffffff8152a825>] ? page_fault+0x25/0x30
我的 dmesg 日志：
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.32-431.3.1.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Fri Jan 3 21:39:27 UTC 2014
Command line: ro root=/dev/mapper/vg0-root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg0/swap rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto rd_NO_DM KEYBOARDTYPE=pc KEYTABLE=us rd_LVM_LV=vg0/root
KERNEL supported cpus:
Intel GenuineIntel
AMD AuthenticAMD
Centaur CentaurHauls
Disabled fast string operations
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000007fffd000 (usable)
BIOS-e820: 000000007fffd000 - 0000000080000000 (reserved)
BIOS-e820: 00000000fffbc000 - 0000000100000000 (reserved)
DMI 2.4 present.
SMBIOS version 2.4 @ 0xFDA10
DMI: Red Hat KVM, BIOS 0.5.1 01/01/2007
Hypervisor detected: KVM
e820 update range: 0000000000000000 - 0000000000001000 (usable) ==> (reserved)
e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
last_pfn = 0x7fffd max_arch_pfn = 0x400000000
MTRR default type: write-back
MTRR fixed ranges enabled:
00000-9FFFF write-back
A0000-BFFFF uncachable
C0000-FFFFF write-protect
MTRR variable ranges enabled:
0 base 00E0000000 mask FFE0000000 uncachable
1 disabled
2 disabled
3 disabled
4 disabled
5 disabled
6 disabled
7 disabled
PAT not supported by CPU.
initial memory mapped : 0 - 20000000
init_memory_mapping: 0000000000000000-000000007fffd000
0000000000 - 007fe00000 page 2M
007fe00000 - 007fffd000 page 4k
kernel direct mapping tables up to 7fffd000 @ 8000-c000
RAMDISK: 36f8c000 - 37fefeb5
ACPI: RSDP 00000000000fd9e0 00014 (v00 BOCHS )
ACPI: RSDT 000000007fffd640 00034 (v01 BOCHS BXPCRSDT 00000001 BXPC 00000001)
ACPI: FACP 000000007ffffe20 00074 (v01 BOCHS BXPCFACP 00000001 BXPC 00000001)
ACPI: DSDT 000000007fffd8c0 024F1 (v01 BXPC BXDSDT 00000001 INTL 20090123)
ACPI: FACS 000000007ffffdc0 00040
ACPI: SSDT 000000007fffd7c0 000FF (v01 BOCHS BXPCSSDT 00000001 BXPC 00000001)
ACPI: APIC 000000007fffd6d0 00080 (v01 BOCHS BXPCAPIC 00000001 BXPC 00000001)
ACPI: SSDT 000000007fffd680 0004E (v01 BXPC BXSSDTPC 00000001 INTL 20090123)
ACPI: Local APIC address 0xfee00000
Setting APIC routing to flat.
No NUMA configuration found
Faking a node at 0000000000000000-000000007fffd000
Bootmem setup node 0 0000000000000000-000000007fffd000
NODE_DATA [000000000000a000 - 000000000003dfff]
bootmap [000000000003e000 - 000000000004dfff] pages 10
(7 early reservations) ==> bootmem [0000000000 - 007fffd000]
#0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
#1 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 - 0000008000]
#2 [0001000000 - 000201faa4] TEXT DATA BSS ==> [0001000000 - 000201faa4]
#3 [0036f8c000 - 0037fefeb5] RAMDISK ==> [0036f8c000 - 0037fefeb5]
#4 [000009f400 - 0000100000] BIOS reserved ==> [000009f400 - 0000100000]
#5 [0002020000 - 0002020081] BRK ==> [0002020000 - 0002020081]
#6 [0000008000 - 000000a000] PGTABLE ==> [0000008000 - 000000a000]
found SMP MP-table at [ffff8800000fda30] fda30
Reserving 129MB of memory at 48MB for crashkernel (System RAM: 2047MB)
kvm-clock: Using msrs 4b564d01 and 4b564d00
kvm-clock: cpu 0, msr 0:1c247c1, boot clock
[ffffea0000000000-ffffea00009fffff] PMD -> [ffff880002600000-ffff880002ffffff] on node 0
[ffffea0000a00000-ffffea0001bfffff] PMD -> [ffff88000b200000-ffff88000c3fffff] on node 0
Zone PFN ranges:
DMA 0x00000001 -> 0x00001000
DMA32 0x00001000 -> 0x00100000
Normal 0x00100000 -> 0x00100000
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
0: 0x00000001 -> 0x0000009f
0: 0x00000100 -> 0x0007fffd
On node 0 totalpages: 524187
DMA zone: 56 pages used for memmap
DMA zone: 101 pages reserved
DMA zone: 3841 pages, LIFO batch:0
DMA32 zone: 7112 pages used for memmap
DMA32 zone: 513077 pages, LIFO batch:31
ACPI: PM-Timer IO Port: 0xb008
ACPI: Local APIC address 0xfee00000
Setting APIC routing to flat.
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ5 used by override.
ACPI: IRQ9 used by override.
ACPI: IRQ10 used by override.
ACPI: IRQ11 used by override.
Using ACPI (MADT) for SMP configuration information
SMP: Allowing 2 CPUs, 0 hotplug CPUs
nr_irqs_gsi: 24
PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
PM: Registered nosave memory: 00000000000a0000 - 00000000000f0000
PM: Registered nosave memory: 00000000000f0000 - 0000000000100000
Allocating PCI resources starting at 80000000 (gap: 80000000:7ffbc000)
Booting paravirtualized kernel on KVM
NR_CPUS:4096 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:1
PERCPU: Embedded 31 pages/cpu @ffff880002200000 s94872 r8192 d23912 u1048576
pcpu-alloc: s94872 r8192 d23912 u1048576 alloc=1*2097152
pcpu-alloc: [0] 0 1
kvm-clock: cpu 0, msr 0:22167c1, primary cpu clock
kvm-stealtime: cpu 0, msr 220e880
Built 1 zonelists in Node order, mobility grouping on. Total pages: 516918
Policy zone: DMA32
Kernel command line: ro root=/dev/mapper/vg0-root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg0/swap rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=129M@0M rd_NO_DM KEYBOARDTYPE=pc KEYTABLE=us rd_LVM_LV=vg0/root
PID hash table entries: 4096 (order: 3, 32768 bytes)
Checking aperture...
No AGP bridge found
Memory: 1901928k/2097140k available (5325k kernel code, 392k absent, 194820k reserved, 7013k data, 1276k init)
Hierarchical RCU implementation.
NR_IRQS:33024 nr_irqs:424
Console: colour VGA+ 80x25
console [tty0] enabled
allocated 8388608 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory cgroups
Detected 2393.998 MHz processor.
Calibrating delay loop (skipped) preset value.. 4787.99 BogoMIPS (lpj=2393998)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux: Initializing.
SELinux: Starting in permissive mode
Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
Mount-cache hash table entries: 256
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
Initializing cgroup subsys blkio
Initializing cgroup subsys perf_event
Initializing cgroup subsys net_prio
Disabled fast string operations
mce: CPU supports 10 MCE banks
alternatives: switching to unfair spinlock
ACPI: Core revision 20090903
ftrace: converting mcount calls to 0f 1f 44 00 00
ftrace: allocating 21769 entries in 86 pages
APIC routing finalized to flat.
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
CPU0: Intel QEMU Virtual CPU version (cpu64-rhel6) stepping 03
Performance Events: Broken PMU hardware detected, using software events only.
NMI watchdog disabled (cpu0): hardware events not enabled
Booting Node 0, Processors #1 Ok.
kvm-clock: cpu 1, msr 0:23167c1, secondary cpu clock
Disabled fast string operations
kvm-stealtime: cpu 1, msr 230e880
Brought up 2 CPUs
Total of 2 processors activated (9575.99 BogoMIPS).
sizeof(vma)=200 bytes
sizeof(page)=56 bytes
sizeof(inode)=592 bytes
sizeof(dentry)=192 bytes
sizeof(ext3inode)=800 bytes
sizeof(buffer_head)=104 bytes
sizeof(skbuff)=232 bytes
sizeof(task_struct)=2648 bytes
devtmpfs: initialized
regulator: core version 0.5
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: Using configuration type 1 for base access
bio: create slab <bio-0> at 0
ACPI: EC: Look up EC in DSDT
ACPI: Interpreter enabled
ACPI: (supports S0 S3 S4 S5)
ACPI: Using IOAPIC for interrupt routing
ACPI: No dock devices found.
PCI: Ignoring host bridge windows from ACPI; if necessary, use "pci=use_crs" and report a bug
ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
pci_root PNP0A03:00: host bridge window [io 0x0000-0x0cf7] (ignored)
pci_root PNP0A03:00: host bridge window [io 0x0d00-0xffff] (ignored)
pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff] (ignored)
pci_root PNP0A03:00: host bridge window [mem 0xe0000000-0xfebfffff] (ignored)
PCI: root bus 00: using default resources
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
pci_bus 0000:00: root bus resource [mem 0x00000000-0xffffffffff]
pci 0000:00:01.1: reg 20: [io 0xc000-0xc00f]
pci 0000:00:01.2: reg 20: [io 0xc020-0xc03f]
pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI
pci 0000:00:01.3: quirk: [io 0xb100-0xb10f] claimed by PIIX4 SMB
pci 0000:00:02.0: reg 10: [mem 0xf0000000-0xf1ffffff pref]
pci 0000:00:02.0: reg 14: [mem 0xf2000000-0xf2000fff]
pci 0000:00:02.0: reg 30: [mem 0xf2010000-0xf201ffff pref]
pci 0000:00:03.0: reg 10: [mem 0xf2020000-0xf203ffff]
pci 0000:00:03.0: reg 14: [io 0xc040-0xc07f]
pci 0000:00:03.0: reg 30: [mem 0xf2040000-0xf205ffff pref]
pci 0000:00:04.0: reg 10: [io 0xc080-0xc09f]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKS] (IRQs 9) *0
vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
vgaarb: loaded
vgaarb: bridge control possible 0000:00:02.0
SCSI subsystem initialized
libata version 3.00 loaded.
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
PCI: old code would have set cacheline size to 32 bytes, but clflush_size = 64
PCI: pci_cache_line_size set to 64 bytes
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
Switching to clocksource kvm-clock
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp 00:00: [io 0x0cf8-0x0cff]
pnp 00:00: Plug and Play ACPI device, IDs PNP0a03 (active)
pnp 00:01: [io 0x0070-0x0071]
pnp 00:01: [irq 8]
pnp 00:01: [io 0x0072-0x0077]
pnp 00:01: Plug and Play ACPI device, IDs PNP0b00 (active)
pnp 00:02: [io 0x0060]
pnp 00:02: [io 0x0064]
pnp 00:02: [irq 1]
pnp 00:02: Plug and Play ACPI device, IDs PNP0303 (active)
pnp 00:03: [irq 12]
pnp 00:03: Plug and Play ACPI device, IDs PNP0f13 (active)
pnp 00:04: [io 0x03f2-0x03f5]
pnp 00:04: [io 0x03f7]
pnp 00:04: [irq 6]
pnp 00:04: [dma 2]
pnp 00:04: Plug and Play ACPI device, IDs PNP0700 (active)
pnp 00:05: [io 0x03f8-0x03ff]
pnp 00:05: [irq 4]
pnp 00:05: Plug and Play ACPI device, IDs PNP0501 (active)
pnp: PnP ACPI: found 6 devices
ACPI: ACPI bus type pnp unregistered
PCI: max bus depth: 0 pci_try_num: 1
pci_bus 0000:00: resource 4 [io 0x0000-0xffff]
pci_bus 0000:00: resource 5 [mem 0x00000000-0xffffffffff]
ipmi message handler version 39.2
IPMI System Interface driver.
ipmi_si: Adding default-specified kcs state machine
ipmi_si: Trying default-specified kcs state machine at i/o address 0xca2, slave address 0x0, irq 0
ipmi_si: Interface detection failed
ipmi_si: Adding default-specified smic state machine
ipmi_si: Trying default-specified smic state machine at i/o address 0xca9, slave address 0x0, irq 0
ipmi_si: Interface detection failed
ipmi_si: Adding default-specified bt state machine
ipmi_si: Trying default-specified bt state machine at i/o address 0xe4, slave address 0x0, irq 0
ipmi_si: Interface detection failed
ipmi_si: Unable to find any System Interface(s)
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: Power Button [PWRF]
ACPI: acpi_idle registered with cpuidle
ACPI Exception: AE_NOT_FOUND, No or invalid critical threshold (20090903/thermal-386)
GHES: HEST is not enabled!
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
crash memory driver: version 1.1
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
brd: module loaded
loop: module loaded
input: Macintosh mouse button emulation as /devices/virtual/input/input1
Fixed MDIO Bus: probed
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
uhci_hcd: USB Universal Host Controller Interface driver
uhci_hcd 0000:00:01.2: PCI INT D -> Link[LNKD] -> GSI 11 (level, high) -> IRQ 11
uhci_hcd 0000:00:01.2: setting latency timer to 64
uhci_hcd 0000:00:01.2: UHCI Host Controller
uhci_hcd 0000:00:01.2: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:01.2: irq 11, io base 0x0000c020
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: UHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.32-431.3.1.el6.x86_64 uhci_hcd
usb usb1: SerialNumber: 0000:00:01.2
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mice: PS/2 mouse device common for all mice
input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
rtc_cmos 00:01: RTC can wake from S4
rtc_cmos 00:01: rtc core: registered rtc_cmos as rtc0
rtc0: alarms up to one day, 114 bytes nvram
cpuidle: using governor ladder
cpuidle: using governor menu
EFI Variables Facility v0.08 2004-May-17
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
GRE over IPv4 demultiplexor driver
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
registered taskstats version 1
rtc_cmos 00:01: setting system clock to 2014-01-14 06:41:15 UTC (1389681675)
Initalizing network drop monitor service
Freeing unused kernel memory: 1276k freed
Write protecting the kernel read-only data: 10240k
Freeing unused kernel memory: 800k freed
Freeing unused kernel memory: 1584k freed
dracut: dracut-004-336.el6_5.2
dracut: rd_NO_LUKS: removing cryptoluks activation
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.24.6-ioctl (2013-01-15) initialised: [email protected]
udev: starting version 147
dracut: Starting plymouth daemon
usb 1-1: new full speed USB device number 2 using uhci_hcd
dracut: rd_NO_DM: removing DM RAID activation
dracut: rd_NO_MD: removing MD RAID activation
usb 1-1: New USB device found, idVendor=0627, idProduct=0001
usb 1-1: New USB device strings: Mfr=1, Product=3, SerialNumber=5
usb 1-1: Product: QEMU USB Tablet
usb 1-1: Manufacturer: QEMU 0.12.1
usb 1-1: SerialNumber: 42
usb 1-1: configuration #1 chosen from 1 choice
ata_piix 0000:00:01.1: version 2.13
ata_piix 0000:00:01.1: setting latency timer to 64
scsi0 : ata_piix
scsi1 : ata_piix
ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc000 irq 14
ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc008 irq 15
Refined TSC clocksource calibration: 2393.890 MHz.
input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
input: QEMU 0.12.1 QEMU USB Tablet as /devices/pci0000:00/0000:00:01.2/usb1/1-1/1-1:1.0/input/input4
generic-usb 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Pointer [QEMU 0.12.1 QEMU USB Tablet] on usb-0000:00:01.2-1/input0
ata1.01: NODEV after polling detection
ata1.00: ATA-7: QEMU HARDDISK, 0.12.1, max UDMA/100
ata1.00: 125829120 sectors, multi 16: LBA48
ata2.01: NODEV after polling detection
ata2.00: ATAPI: QEMU DVD-ROM, 0.12.1, max UDMA/100
ata1.00: configured for MWDMA2
scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK 0.12 PQ: 0 ANSI: 5
ata2.00: configured for MWDMA2
scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM 0.12 PQ: 0 ANSI: 5
virtio-pci 0000:00:04.0: PCI INT A -> Link[LNKD] -> GSI 11 (level, high) -> IRQ 11
sd 0:0:0:0: [sda] 125829120 512-byte logical blocks: (64.4 GB/60.0 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sda: sda1 sda2
sd 0:0:0:0: [sda] Attached SCSI disk
sr0: scsi3-mmc drive: 4x/4x xa/form2 tray
Uniform CD-ROM driver Revision: 3.20
sr 1:0:0:0: Attached scsi CD-ROM sr0
dracut: Scanning devices sda2 for LVM logical volumes vg0/swap vg0/root
dracut: inactive '/dev/vg0/tmp' [2.00 GiB] inherit
dracut: inactive '/dev/vg0/root' [53.80 GiB] inherit
dracut: inactive '/dev/vg0/swap' [4.00 GiB] inherit
EXT4-fs (dm-0): INFO: recovery required on readonly filesystem
EXT4-fs (dm-0): write access will be enabled during recovery
EXT4-fs (dm-0): orphan cleanup on readonly fs
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 1835258
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 2754263
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 2752522
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 1837359
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 1837354
EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 1835927
EXT4-fs (dm-0): 6 orphan inodes deleted
EXT4-fs (dm-0): recovery complete
EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts:
dracut: Remounting /dev/mapper/vg0-root with -o usrquota,ro
EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts:
dracut: Mounted root filesystem /dev/mapper/vg0-root
dracut: Loading SELinux policy
SELinux: 2048 avtab hash slots, 277800 rules.
SELinux: 2048 avtab hash slots, 277800 rules.
SELinux: 9 users, 12 roles, 3917 types, 217 bools, 1 sens, 1024 cats
SELinux: 81 classes, 277800 rules
SELinux: Completing initialization.
SELinux: Setting up existing superblocks.
SELinux: initialized (dev dm-0, type ext4), uses xattr
SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts
SELinux: initialized (dev selinuxfs, type selinuxfs), uses genfs_contexts
SELinux: initialized (dev mqueue, type mqueue), uses transition SIDs
SELinux: initialized (dev hugetlbfs, type hugetlbfs), uses transition SIDs
SELinux: initialized (dev devpts, type devpts), uses transition SIDs
SELinux: initialized (dev inotifyfs, type inotifyfs), uses genfs_contexts
SELinux: initialized (dev anon_inodefs, type anon_inodefs), uses genfs_contexts
SELinux: initialized (dev pipefs, type pipefs), uses task SIDs
SELinux: initialized (dev debugfs, type debugfs), uses genfs_contexts
SELinux: initialized (dev sockfs, type sockfs), uses task SIDs
SELinux: initialized (dev devtmpfs, type devtmpfs), uses transition SIDs
SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
SELinux: initialized (dev proc, type proc), uses genfs_contexts
SELinux: initialized (dev bdev, type bdev), uses genfs_contexts
SELinux: initialized (dev rootfs, type rootfs), uses genfs_contexts
SELinux: initialized (dev sysfs, type sysfs), uses genfs_contexts
type=1403 audit(1389681680.167:2): policy loaded auid=4294967295 ses=4294967295
dracut:
dracut: Switching root
udev: starting version 147
sd 0:0:0:0: Attached scsi generic sg0 type 0
sr 1:0:0:0: Attached scsi generic sg1 type 5
piix4_smbus 0000:00:01.3: SMBus Host Controller at 0xb100, revision 0
e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
e1000: Copyright (c) 1999-2006 Intel Corporation.
ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 10
e1000 0000:00:03.0: PCI INT A -> Link[LNKC] -> GSI 10 (level, high) -> IRQ 10
e1000 0000:00:03.0: setting latency timer to 64
e1000 0000:00:03.0: eth0: (PCI:33MHz:32-bit) 06:01:44:00:12:ef
e1000 0000:00:03.0: eth0: Intel(R) PRO/1000 Network Connection
microcode: CPU0 sig=0x6d3, pf=0x1, revision=0x1
platform microcode: firmware: requesting intel-ucode/06-0d-03
microcode: CPU1 sig=0x6d3, pf=0x1, revision=0x1
platform microcode: firmware: requesting intel-ucode/06-0d-03
Microcode Update Driver: v2.00 <[email protected]>, Peter Oruba
SELinux: initialized (dev sda1, type ext2), uses xattr
EXT4-fs (dm-2): mounted filesystem with ordered data mode. Opts:
SELinux: initialized (dev dm-2, type ext4), uses xattr
type=1400 audit(1389681713.367:3): avc: denied { write } for pid=785 comm="quotacheck" path="/dev/pts/0" dev=devpts ino=3 scontext=system_u:system_r:quota_t:s0 tcontext=system_u:object_r:devpts_t:s0 tclass=chr_file
type=1400 audit(1389681713.424:4): avc: denied { module_request } for pid=787 comm="quotaon" kmod="quota_v1" scontext=system_u:system_r:quota_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system
Adding 4194296k swap on /dev/mapper/vg0-swap. Priority:-1 extents:1 across:4194296k
SELinux: initialized (dev binfmt_misc, type binfmt_misc), uses genfs_contexts
以下是 Cron 日志示例：
Jan 13 16:40:01 server1 CROND[7026]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Jan 13 16:41:01 server1 CROND[7120]: (oilgasfr) CMD (/tmp/.ICE-unix/components/y2kupdate >/dev/null 2>&1)
Jan 13 16:42:01 server1 CROND[7281]: (oilgasfr) CMD (/tmp/.ICE-unix/components/y2kupdate >/dev/null 2>&1)
Jan 13 16:43:01 server1 CROND[7412]: (oilgasfr) CMD (/tmp/.ICE-unix/components/y2kupdate >/dev/null 2>&1)
知道我应该从哪里开始吗？我已经完成了禁用模块和重建 Apache 的整个过程。
谢谢
答案1
内存不足：杀死进程 20781 (php) 得分 4 或牺牲子进程 杀死的进程 20781，UID 504，(php) total-vm：266888kB，anon-rss：3268kB，file-rss：1604kB
您没有更多内存可用。您的服务器无法再处理新的 apache 和 mysql 线程/进程（实际上没有进程），并且开始死机。在这种情况下，您必须增加 RAM。我不知道您的服务器每秒处理多少个连接，但在我看来，2 Go 是不够的。
使用 free -l 检查