I must say that I am not the guy that set up the server,but the poor sap tasked with finding out what is happening for the time being. I only have a rough knowledge about apache and linux,so please bear with me…

问题

我们的apache服务器关闭(主要是在夜间)并且无法恢复并重新开始备份,没有任何人实际告诉它.

从我可以收集的内容来看,这里有趣的是apache错误日志中的以下行;

[Wed Apr 15 03:43:02.114879 2015] [mpm_prefork:notice] [pid 25778] AH00171: Graceful restart requested,doing restart

之后是一个非常长的堆栈跟踪,这里是前几行：

*** Error in `/usr/sbin/httpd': free(): invalid pointer: 0x00007f581d5c13c0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7d19d)[0x7f583b69519d]
/etc/httpd/modules/libPHP5.so(PHP_module_shutdown+0x2b)[0x7f58301d255b]
/etc/httpd/modules/libPHP5.so(PHP_module_shutdown_wrapper+0x9)[0x7f58301d2619]
[...]

回溯持续了一段时间,但有趣的是,在这之间,/usr/sbin / httpd […]中的错误重复5次,直到最后一条消息为止

[Wed Apr 15 03:43:02.269626 2015] [core:notice] [pid 25778] AH00060: seg fault or similar nasty error detected in the parent process

下一条消息是第二天我再次启动服务器;

[Wed Apr 15 08:14:46.200884 2015] [core:notice] [pid 30326] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Wed Apr 15 08:14:46.215410 2015] [suexec:notice] [pid 30326] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Apr 15 08:14:46.235346 2015] [auth_digest:notice] [pid 30326] AH01757: generating secret for digest authentication ...
[Wed Apr 15 08:14:46.236045 2015] [lbmethod_heartbeat:notice] [pid 30326] AH02282: No slotmem from mod_heartmonitor
[Wed Apr 15 08:14:46.280992 2015] [core:warn] [pid 30326] AH00098: pid file /run/httpd/httpd.pid overwritten -- Unclean shutdown of prevIoUs Apache run?
[Wed Apr 15 08:14:46.284919 2015] [mpm_prefork:notice] [pid 30326] AH00163: Apache/2.4.6 (CentOS) PHP/5.4.16 configured -- resuming normal operations
[Wed Apr 15 08:14:46.284939 2015] [core:notice] [pid 30326] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'

思考

在我看来,prefork模块以某种方式请求apache进程(或其中一个？)关闭.这失败了,作为回报,整个事情都崩溃得非常可怕.

问题

首先是：我的分析 – 崩溃服务器的问题是prefork模块 – 是否正确？

我应该禁用prefork模块吗？我不知道如何调试/帮助软件内部的内存错误.

禁用此模块时有什么影响？

版本信息

Linux version 3.10.0-123.13.2.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.2 20140120 (Red Hat 4.8.2-16) (GCC) )

Server version: Apache/2.4.6 (CentOS)
Server built:   Jan 12 2015 13:22:31
Server's Module Magic Number: 20120211:23
Server loaded:  APR 1.4.8,APR-UTIL 1.5.2
Compiled using: APR 1.4.8,APR-UTIL 1.5.2
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/httpd"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="/run/httpd/httpd.pid"
 -D DEFAULT_scoreBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

对评论的回应

cron的

没有/etc/cron.d/dailyjobs,但只有一个0hourly脚本,它执行每小时脚本0anacron,0yum-hourly.cron和dellrda.cron – 其中任何一个似乎都没有做任何与apache相关的事情(恕我直言)

/etc/logrotate.d/httpd

/var/log/httpd/*log {
    missingok
    notifempty
    sharedscripts
    delaycompress
    postrotate
        /bin/systemctl reload httpd.service > /dev/null 2>/dev/null || true
    endscript
}

手动重装

/bin/systemctl reload httpd.service

得出以下结果

Job for httpd.service Failed. See 'systemctl status httpd.service' and 'journalctl -xn' for details.

在error_log中显示与上面相同的消息.

一个快速的systemctl状态httpd.service显示：

httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
   Active: Failed (Result: signal) since Fri 2015-04-17 12:26:36 CEST; 8s ago
  Process: 8828 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited,status=0/SUCCESS)
  Process: 8826 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful (code=exited,status=0/SUCCESS)
  Process: 8767 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=killed,signal=ABRT)
 Main PID: 8767 (code=killed,signal=ABRT)
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"

apachectl -M

Loaded Modules:
 core_module (static)
 so_module (static)
 http_module (static)
 access_compat_module (shared)
 actions_module (shared)
 alias_module (shared)
 allowmethods_module (shared)
 auth_basic_module (shared)
 auth_digest_module (shared)
 authn_anon_module (shared)
 authn_core_module (shared)
 authn_dbd_module (shared)
 authn_dbm_module (shared)
 authn_file_module (shared)
 authn_socache_module (shared)
 authz_core_module (shared)
 authz_dbd_module (shared)
 authz_dbm_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_owner_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cache_module (shared)
 cache_disk_module (shared)
 data_module (shared)
 dbd_module (shared)
 deflate_module (shared)
 dir_module (shared)
 dumpio_module (shared)
 echo_module (shared)
 env_module (shared)
 expires_module (shared)
 ext_filter_module (shared)
 filter_module (shared)
 headers_module (shared)
 include_module (shared)
 info_module (shared)
 log_config_module (shared)
 logio_module (shared)
 mime_magic_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 remoteip_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 slotmem_plain_module (shared)
 slotmem_shm_module (shared)
 socache_dbm_module (shared)
 socache_memcache_module (shared)
 socache_shmcb_module (shared)
 status_module (shared)
 substitute_module (shared)
 suexec_module (shared)
 unique_id_module (shared)
 unixd_module (shared)
 userdir_module (shared)
 version_module (shared)
 vhost_alias_module (shared)
 dav_module (shared)
 dav_fs_module (shared)
 dav_lock_module (shared)
 lua_module (shared)
 mpm_prefork_module (shared)
 proxy_module (shared)
 lbmethod_bybusyness_module (shared)
 lbmethod_byrequests_module (shared)
 lbmethod_bytraffic_module (shared)
 lbmethod_heartbeat_module (shared)
 proxy_ajp_module (shared)
 proxy_balancer_module (shared)
 proxy_connect_module (shared)
 proxy_express_module (shared)
 proxy_fcgi_module (shared)
 proxy_fdpass_module (shared)
 proxy_ftp_module (shared)
 proxy_http_module (shared)
 proxy_scgi_module (shared)
 systemd_module (shared)
 cgi_module (shared)
 PHP5_module (shared)