Muitos processos do apache2 causando alta carga do servidor

1

Percebi que meu site estava inativo hoje e, quando eu fiz o ssh em minha caixa e executei o top , percebi que a carga do meu servidor era muito alta. Eu rapidamente desliguei o apache e esperei até que a carga caísse, mas assim que iniciei o apache, a carga e os processos começaram a subir muito rapidamente. O site é um blog wordpress básico.

Aqui está a saída de top

top - 15:24:50 up 11:19,  1 user,  load average: 29.76, 24.04, 19.27
Tasks: 129 total,  33 running,  96 sleeping,   0 stopped,   0 zombie
%Cpu(s): 30.5 us,  2.8 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si, 66.8 st
KiB Mem:   2048448 total,  1092188 used,   956260 free,   162896 buffers
KiB Swap:  1048572 total,        0 used,  1048572 free.   397860 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                                                                                                                                                                                   
 1061 mysql     20   0  897664 111416   7784 S  4.3  5.4  13:56.63 mysqld                                                                                                                                                                                                                                                    
 7205 ubuntu    20   0  406700  38676  23276 R  3.6  1.9   0:20.75 apache2                                                                                                                                                                                                                                                   
 7273 ubuntu    20   0  406840  41928  26636 R  3.6  2.0   0:13.05 apache2                                                                                                                                                                                                                                                   
 7137 ubuntu    20   0  407284  39664  23872 R  3.3  1.9   0:30.87 apache2                                                                                                                                                                                                                                                   
 7196 ubuntu    20   0  407208  40160  24464 R  3.3  2.0   0:21.61 apache2                                                                                                                                                                                                                                                   
 7202 ubuntu    20   0  406796  38720  23168 R  3.3  1.9   0:21.10 apache2                                                                                                                                                                                                                                                   
 7203 ubuntu    20   0  407576  42880  26596 R  3.3  2.1   0:20.74 apache2                                                                                                                                                                                                                                                   
 7218 ubuntu    20   0  406040  38772  24004 R  3.3  1.9   0:18.09 apache2                                                                                                                                                                                                                                                   
 7219 ubuntu    20   0  406952  39360  23744 R  3.3  1.9   0:18.09 apache2                                                                                                                                                                                                                                                   
 7222 ubuntu    20   0  406804  38420  23128 R  3.3  1.9   0:17.48 apache2                                                                                                                                                                                                                                                   
 7228 ubuntu    20   0  402540  36764  25320 R  3.3  1.8   0:17.75 apache2                                                                                                                                                                                                                                                   
 7244 ubuntu    20   0  407060  38652  23096 R  3.3  1.9   0:16.10 apache2                                                                                                                                                                                                                                                   
 7245 ubuntu    20   0  407052  38764  23220 R  3.3  1.9   0:15.67 apache2                                                                                                                                                                                                                                                   
 7252 ubuntu    20   0  406736  39336  23944 R  3.3  1.9   0:15.70 apache2                                                                                                                                                                                                                                                   
 7254 ubuntu    20   0  407316  39552  23712 R  3.3  1.9   0:14.81 apache2                                                                                                                                                                                                                                                   
 7256 ubuntu    20   0  407264  40444  24748 R  3.3  2.0   0:14.41 apache2                                                                                                                                                                                                                                                   
 7260 ubuntu    20   0  406544  38948  23908 R  3.3  1.9   0:15.01 apache2

Este é o número de IPs conectados no momento:

netstat -ntu | grep ESTAB | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr
     2 75.112.**
     1 54.251.**
     1 54.245.**
     1 54.232.**
     1 54.228.**

E aqui estão minhas informações de hardware

  description: Computer
  product: HVM domU ()
  vendor: Xen
  version: 4.2.amazon
  serial: **
  width: 64 bits
  capabilities: smbios-2.4 dmi-2.4 ldt16 vsyscall32
  configuration: boot=normal uuid=**
*-core
     description: Motherboard
     physical id: 0
   *-firmware:0
        description: BIOS
        vendor: Xen
        physical id: 0
        version: 4.2.amazon
        date: 12/03/2014
        size: 96KiB
        capabilities: pci edd
   *-cpu:0
        description: CPU
        product: Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
        vendor: Intel Corp.
        physical id: 1
        bus info: cpu@0
        slot: CPU 1
        size: 2500MHz
        capacity: 2500MHz
        width: 64 bits
        capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp x86-64 constant_tsc rep_good nopl xtopology eagerfpu pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm xsaveopt fsgsbase smep erms
   *-memory:0
        description: System Memory
        physical id: 2
        capacity: 2GiB
      *-bank:0
           description: DIMM RAM
           physical id: 0
           slot: DIMM 0
           size: 2GiB
           width: 64 bits
      *-bank:1
           description: DIMM RAM
           physical id: 1
           slot: DIMM 0
           size: 2GiB
           width: 64 bits
   *-firmware:1
        description: BIOS
        vendor: Xen
        physical id: 3
        version: 4.2.amazon
        date: 12/03/2014
        size: 96KiB
        capabilities: pci edd
   *-cpu:1
        description: CPU
        vendor: Intel
        physical id: 4
        bus info: cpu@1
        slot: CPU 1
        size: 2500MHz
        capacity: 2500MHz
   *-memory:1
        description: System Memory
        physical id: 5
        capacity: 2GiB
   *-memory:2 UNCLAIMED
        physical id: 6
   *-memory:3 UNCLAIMED
        physical id: 7
   *-pci
        description: Host bridge
        product: 440FX - 82441FX PMC [Natoma]
        vendor: Intel Corporation
        physical id: 100
        bus info: pci@0000:00:00.0
        version: 02
        width: 32 bits
        clock: 33MHz
      *-isa
           description: ISA bridge
           product: 82371SB PIIX3 ISA [Natoma/Triton II]
           vendor: Intel Corporation
           physical id: 1
           bus info: pci@0000:00:01.0
           version: 00
           width: 32 bits
           clock: 33MHz
           capabilities: isa bus_master
           configuration: latency=0
      *-ide
           description: IDE interface
           product: 82371SB PIIX3 IDE [Natoma/Triton II]
           vendor: Intel Corporation
           physical id: 1.1
           bus info: pci@0000:00:01.1
           version: 00
           width: 32 bits
           clock: 33MHz
           capabilities: ide bus_master
           configuration: driver=ata_piix latency=64
           resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:c100(size=16)
      *-bridge UNCLAIMED
           description: Bridge
           product: 82371AB/EB/MB PIIX4 ACPI
           vendor: Intel Corporation
           physical id: 1.3
           bus info: pci@0000:00:01.3
           version: 01
           width: 32 bits
           clock: 33MHz
           capabilities: bridge bus_master
           configuration: latency=0
      *-display UNCLAIMED
           description: VGA compatible controller
           product: GD 5446
           vendor: Cirrus Logic
           physical id: 2
           bus info: pci@0000:00:02.0
           version: 00
           width: 32 bits
           clock: 33MHz
           capabilities: vga_controller bus_master
           configuration: latency=0
           resources: memory:f0000000-f1ffffff memory:f3000000-f3000fff
      *-generic
           description: Unassigned class
           product: Xen Platform Device
           vendor: XenSource, Inc.
           physical id: 3
           bus info: pci@0000:00:03.0
           version: 01
           width: 32 bits
           clock: 33MHz
           capabilities: bus_master
           configuration: driver=xen-platform-pci latency=0
           resources: irq:28 ioport:c000(size=256) memory:f2000000-f2ffffff
*-network
     description: Ethernet interface
     physical id: 1
     logical name: eth0
     serial: **
     capabilities: ethernet physical
     configuration: broadcast=yes driver=vif ip=*** link=yes multicast=yes

Alguma sugestão de como eu posso depurar isso ainda mais?

EDITAR:

Eu pensei em adicionar isso também. Eu reduzi MaxClients de 30 para 10 conforme sugestão de @nochkin e a queda de carga para cerca de 8,0.

<IfModule mpm_prefork_module>
    StartServers          3
    MinSpareServers       3
    MaxSpareServers       5
    MaxClients           10
    MaxRequestsPerChild   0
</IfModule>
    
por Ken 17.12.2014 / 16:39

1 resposta

1

Você precisará ajustar o número de processos filhos para algo menor. Dependendo da sua configuração, isso pode estar localizado no arquivo httpd-mpm.conf ou httpd.conf.

    
por 17.12.2014 / 16:54