Centos

Apache 意外關閉

  • August 8, 2019

我必須說，我不是設置伺服器的人，而是負責找出暫時發生的事情的可憐的 sap。我對apache和linux只有粗略的了解，所以請多多包涵……

問題

我們的 apache 伺服器關閉（主要是在夜間）並且無法恢復並重新啟動，而沒有人真正告訴它這樣做。

據我所知，這裡有趣的是 apache 錯誤日誌中的以下行：

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

之後是一個很長的堆棧跟踪，這裡是前幾行：

*** 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]
[...]

回溯會持續一段時間，但有趣的是，在這之間，它會Error in /usr/sbin/httpd [...]重複 5 次，直到最後一條消息

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

下一條消息是在我再次啟動伺服器的第二天：

[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'

想法

正如我所看到的，prefork 模組以某種方式請求 apache 程序（或其中之一？）關閉。這失敗了，作為回報，整個事情都可怕地崩潰了。

問題

首先也是最重要的：我的分析——導致伺服器崩潰的問題是prefork模組——正確嗎？

我應該禁用 prefork 模組嗎？我看不到如何調試/幫助軟體本身內部的記憶體錯誤。

當我禁用此模組時，它有什麼影響？

版本資訊

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"

對評論的回應

cron

沒有/etc/cron.d/dailyjobs，只有一個0hourly腳本，它執行每小時的腳本0anacron，0yum-hourly.cron並且dellrda.cron- 似乎都沒有做任何與 apache 相關的事情（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
}

手動重新載入

/bin/systemctl reload httpd.service

帶來以下結果

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

並在與error_log上面相同的消息中顯示。

快速systemctl status httpd.service揭示：

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)

我的猜測是您遇到了這個錯誤：http : //bugs.centos.org/view.php?id=7669，但我沒有在您載入的模組中看到 mod_gnutls。不過，對我來說，您似乎遇到了某種錯誤。如我所見，您沒有使用最新的 httpd 版本，因此您應該首先嘗試更新您的 httpd 包：

yum update

請稍後重新啟動您的 httpd，然後嘗試重新載入問題是否仍然存在。如果它仍然存在，我建議在 CentOS 上為此打開一個錯誤報告。為避免同時在半夜崩潰，我建議編輯您的 logrotate 腳本以使用

/bin/systemctl restart httpd.service

而不是它的reload對應物，直到問題得到解決。

編輯：

在 CentOS 上打開錯誤報告之前，您應該確保您只使用標準的 CentOS apache 包和模組。如果您使用任何自編譯或從 3rd 方儲存庫安裝的 apache 模組，他們可能不會接受這一點。

要顯示所有已安裝的軟體包及其來自的 repo，您​​可以使用命令

rpm -qa --qf '%{NAME} %{VENDOR}\n'

引用自：https://serverfault.com/questions/683459

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