Apache No space left on device

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Inter-Process Communication，进程间通信

报错信息

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cat /var/logs/httpd/error_log |grep -i device
[Wed Nov 21 20:15:01 2018] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Nov 21 20:15:01 2018] [notice] sohudb_post_config begin
[Wed Nov 21 20:15:01 2018] [notice] create_server_temp_conf begin
[Wed Nov 21 20:15:01 2018] [notice] create_server_temp_conf end
[Wed Nov 21 20:15:01 2018] [notice] Digest: generating secret for digest authentication ...
[Wed Nov 21 20:15:01 2018] [notice] Digest: done
[Wed Nov 21 20:15:01 2018] [notice] sohudb_post_config begin
[Wed Nov 21 20:15:01 2018] [notice] cp_create: ok
[Wed Nov 21 20:15:01 2018] [notice] qdb_cp_create: ok
[Wed Nov 21 20:15:01 2018] [notice] socket_cp_create: ok
[Wed Nov 21 20:15:01 2018] [notice] schat_cp_create: ok
[Wed Nov 21 20:15:01 2018] [notice] set_mc_host_sc end
[Wed Nov 21 20:15:01 2018] [notice] cp_initialize: begin 23014
[Wed Nov 21 20:15:01 2018] [notice] cp_initialize: for loop i=0, server_no:1
[Wed Nov 21 20:15:01 2018] [notice] cp_initialize: ok
[Wed Nov 21 20:15:01 2018] [notice] set_qdb_host_sc end
[Wed Nov 21 20:15:01 2018] [notice] qdb_cp_initialize: begin 23014
[Wed Nov 21 20:15:01 2018] [notice] qdb_cp_initialize: for loop i=0, server_no:1
[Wed Nov 21 20:15:01 2018] [notice] qdb_cp_initialize: ok
[Wed Nov 21 20:15:01 2018] [notice] set_socket_host_sc end
[Wed Nov 21 20:15:01 2018] [notice] socket_cp_initialize: begin 23014
[Wed Nov 21 20:15:01 2018] [notice] socket_cp_initialize: for loop i=0, server_no:1
[Wed Nov 21 20:15:01 2018] [notice] socket_cp_initialize: ok
[Wed Nov 21 20:15:01 2018] [notice] set_schat_host_sc end
[Wed Nov 21 20:15:01 2018] [notice] schat_cp_initialize: begin 23014
[Wed Nov 21 20:15:01 2018] [notice] schat_cp_initialize: for loop i=0, server_no:1
[Wed Nov 21 20:15:01 2018] [notice] schat_cp_initialize: for loop i=0, server_no:1,0,900,1000
[Wed Nov 21 20:15:01 2018] [notice] schat_cp_initialize: ok
[Wed Nov 21 20:15:01 2018] [notice] sohudb_post_config end
[Wed Nov 21 20:15:01 2018] [warn] pid file /etc/httpd/run/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[Wed Nov 21 20:15:01 2018] [emerg] (28)No space left on device: Couldn't create accept lock (/etc/httpd/logs/accept.lock.23014) (5)

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# ipcs -s

------ Semaphore Arrays --------
key        semid      owner      perms      nsems
0x000000a7 0          root      600        1
0x00000000 65273857   apache    600        1
0x00000000 65372162   apache    600        1
0x00000000 65470467   apache    600        1
0x00000000 65568772   apache    600        1
0x00000000 65667077   apache    600        1
0x00000000 65765382   apache    600        1
0x00000000 65863687   apache    600        1
0x00000000 65961992   apache    600        1
0x00000000 66060297   apache    600        1
0x00000000 66158602   apache    600        1
0x00000000 66256907   apache    600        1
0x00000000 66355212   apache    600        1
0x00000000 66453517   apache    600        1
0x00000000 66551822   apache    600        1
0x00000000 66650127   apache    600        1
0x00000000 66748432   apache    600        1
0x00000000 66846737   apache    600        1
0x00000000 66945042   apache    600        1
0x00000000 67043347   apache    600        1
0x00000000 67141652   apache    600        1
0x00000000 67239957   apache    600        1
0x00000000 67338262   apache    600        1
0x00000000 67436567   apache    600        1
0x00000000 67534872   apache    600        1
0x00000000 67633177   apache    600        1
0x00000000 67731482   apache    600        1
0x00000000 67829787   apache    600        1
0x00000000 67928092   apache    600        1
0x00000000 68026397   apache    600        1
0x00000000 68124702   apache    600        1
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# ipcs -l

------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 67108864
max total shared memory (kbytes) = 17179869184
min seg size (bytes) = 1

------ Semaphore Limits --------
max number of arrays = 512
max semaphores per array = 25032000
max semaphores system wide = 32
max ops per semop call = 512
semaphore max value = 32767

------ Messages: Limits --------
max queues system wide = 16
max size of message (bytes) = 65536
default max size of queue (bytes) = 65536
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# ipcs -a

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status
0x74008327 3440640    root      600        4          0
0x740082fd 4128769    root      600        4          0
0x00000000 4489218    root      644        80         2
0x740082fc 4096003    root      600        4          0
0x00000000 4521988    root      644        16384      2
0x00000000 4554757    root      644        280        2

------ Semaphore Arrays --------
key        semid      owner      perms      nsems
0x000000a7 0          root      600        1
0x00000000 170524673  apache    600        1
0x00000000 170557442  apache    600        1

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages

处理方案

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# for i in $(/usr/bin/ipcs -s | awk '/apache/ {print $2}'); do /usr/bin/ipcrm -s $i; done
# ipcs -s

------ Semaphore Arrays --------
key        semid      owner      perms      nsems
0x000000a7 0          root      600        1
0x00000000 170524673  apache    600        1
0x00000000 170557442  apache    600        1

linux/unix下的进程间两类通信方式

基于文件的IPC

  • 基于普通文件的IPC
  • 基于管道文件的IPC
    • 普通管道
    • 匿名管道
      • 匿名管道只能使用在父子进程之间
  • 基于socket文件的IPC
    • 对等模型
      • 对等模型主要用于udp编程
    • C/S模型
      • C/S模型主要用于TCP编程

基于内存的IPC

  • 基于共享内存的IPC，
  • 基于共享队列的IPC，
  • 基于信号量的IPC。
  • 内核内存的工具（ipcs）

    ipcs命令往标准输出写入一些关于活动进程间通信设施的信息.

    • ipcs可以指定查看的具体信息，
      • 如ipcs -m 查看共享内存，
      • -q：查看共享队列，
      • ipcs -s查看共享信号量，
      • 以上3中都不指定时则是查看共享内存、共享队列和共享信号量

参考文档