长话短说，最新版本的 Apache 在我的特定设置中导致了一些错误，因此我快速升级到 PHP 7.1.6，切换到 mpm-event，并开始使用 PHP- FPM。我猜它可能也在其中的某个地方重新安装了 MySQL。
升级后我的 WordPress 网站的前端看起来相对不错。管理仪表板有时没问题，但经常尝试发布新页面或执行类似操作，它会无限期挂起。如果我重新启动 Apache，它就会恢复注意力，但除了重新启动服务之外，似乎没有什么办法可以解决问题。
在此期间，我的网站的前端也会开始挂起，直到我重新启动 Apache。
显然，我的配置在某个地方有问题，但我很难确定它是什么。我网站的前端速度非常快，直到我在后端做了一些事情，决定将其全部停止。
我一直在检查我能想到的每一个错误日志，但是当这种情况发生时，我没有在 apache2 错误日志中看到任何发生的情况。据我所知，我启用了 PHP-fpm 错误日志记录，但我也没有看到任何内容。
此时我怎样才能找出问题所在？
任何帮助将不胜感激。我已经花了至少十五个小时试图解决这个问题，但进展为零。
谢谢大家。
<小时/>php -v
PHP 7.1.6-1~ubuntu16.04.1+deb.sury.org+1 (cli) (built: Jun 9 2017 08:26:34) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.1.6-1~ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2017, by Zend Technologies
apache2 -v
Server version: Apache/2.4.26 (Ubuntu)
Server built: 2017-06-30T08:42:23
/var/log/apache2/error.log -- 不报告任何错误。
/var/log/fpm-php.www.log -- 空。
/var/log/mysql.err -- 空。
/var/log/mysql.log -- 空。
/var/log/php7.1-fpm.log
[04-Jul-2017 02:08:40] NOTICE: fpm is running, pid 741
[04-Jul-2017 02:08:40] NOTICE: ready to handle connections
[04-Jul-2017 02:08:40] NOTICE: systemd monitor interval set to 10000ms
PHP 模块 --
php -m
[PHP Modules]
calendar
Core
ctype
curl
date
dom
exif
fileinfo
filter
ftp
gd
gettext
hash
iconv
igbinary
json
libxml
mbstring
mcrypt
memcached
msgpack
mysqli
mysqlnd
openssl
pcntl
pcre
PDO
pdo_mysql
Phar
posix
readline
redis
Reflection
session
shmop
SimpleXML
sockets
SPL
standard
sysvmsg
sysvsem
sysvshm
tidy
tokenizer
wddx
xml
xmlreader
xmlwriter
xsl
Zend OPcache
zlib
[Zend Modules]
Zend OPcache
a2query -m:
a2query -m
dir (enabled by maintainer script)
headers (enabled by site administrator)
env (enabled by maintainer script)
authz_host (enabled by maintainer script)
reqtimeout (enabled by maintainer script)
include (enabled by site administrator)
rewrite (enabled by site administrator)
auth_basic (enabled by maintainer script)
alias (enabled by maintainer script)
authz_core (enabled by maintainer script)
asis (enabled by site administrator)
status (enabled by maintainer script)
cache (enabled by site administrator)
echo (enabled by site administrator)
autoindex (enabled by maintainer script)
authz_user (enabled by maintainer script)
fastcgi (enabled by maintainer script)
actions (enabled by site administrator)
filter (enabled by maintainer script)
mime (enabled by maintainer script)
expires (enabled by site administrator)
setenvif (enabled by maintainer script)
mpm_event (enabled by site administrator)
socache_shmcb (enabled by site administrator)
authn_file (enabled by maintainer script)
proxy (enabled by site administrator)
access_compat (enabled by maintainer script)
ssl (enabled by site administrator)
deflate (enabled by maintainer script)
authn_core (enabled by maintainer script)
suexec (enabled by site administrator)
negotiation (enabled by maintainer script)
proxy_fcgi (enabled by site administrator)
speling (enabled by site administrator)
http2 (enabled by maintainer script)
info (enabled by site administrator)
proxy_http2 (enabled by site administrator)
我不确定它是什么，但/var/log/apport.log 包含一些如下错误:
ERROR: apport (pid 12399) Tue Jul 4 00:26:27 2017: called for pid 12251, signal 11, core limit 0
ERROR: apport (pid 12399) Tue Jul 4 00:26:27 2017: executable: /usr/sbin/apache2 (command line "/usr/sbin/apache2 -k start")
ERROR: apport (pid 12399) Tue Jul 4 00:26:27 2017: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 12399) Tue Jul 4 00:26:27 2017: apport: report /var/crash/_usr_sbin_apache2.0.crash already exists and unseen, doing nothing to avoid disk usage DoS
/var/log/kern.log:
Jul 4 02:08:39 localhost kernel: [ 2.667815] ppdev: user-space parallel port driver
Jul 4 02:08:39 localhost kernel: [ 2.691111] Request for unknown module key 'Magrathea: Glacier signing key: d120c47c14beb62ead6703d41712cc110575d297' err -11
Jul 4 02:08:39 localhost kernel: [ 2.716583] Request for unknown module key 'Magrathea: Glacier signing key: d120c47c14beb62ead6703d41712cc110575d297' err -11
Jul 4 02:08:39 localhost kernel: [ 2.717334] Request for unknown module key 'Magrathea: Glacier signing key: d120c47c14beb62ead6703d41712cc110575d297' err -11
Jul 4 02:08:40 localhost kernel: [ 5.345061] audit: type=1400 audit(1499148520.484:8): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/874/status" pid=874 comm="mysqld" requeste$
Jul 4 02:08:40 localhost kernel: [ 5.345262] audit: type=1400 audit(1499148520.484:9): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=874 comm="mysqld"$
Jul 4 02:08:40 localhost kernel: [ 5.345373] audit: type=1400 audit(1499148520.484:10): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/874/status" pid=874 comm="mysqld" request$
Jul 4 02:08:40 localhost kernel: [ 5.391287] random: nonblocking pool is initialized
Jul 4 02:08:40 localhost kernel: [ 5.577297] Request for unknown module key 'Magrathea: Glacier signing key: d120c47c14beb62ead6703d41712cc110575d297' err -11
Jul 4 02:10:10 localhost kernel: [ 95.097387] perf interrupt took too long (2626 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
Jul 4 02:26:07 localhost kernel: [ 1052.647086] audit: type=1400 audit(1499149567.761:11): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1445/status" pid=1445 comm="mysqld" reque$
Jul 4 02:26:07 localhost kernel: [ 1052.647352] audit: type=1400 audit(1499149567.761:12): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=1445 comm="mysql$
Jul 4 02:26:07 localhost kernel: [ 1052.647513] audit: type=1400 audit(1499149567.761:13): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1445/status" pid=1445 comm="mysqld" reque$
Jul 4 02:26:23 localhost kernel: [ 1067.895962] audit: type=1400 audit(1499149583.008:14): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1446/status" pid=1446 comm="mysqld" reque$
Jul 4 02:26:23 localhost kernel: [ 1067.896241] audit: type=1400 audit(1499149583.012:15): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=1446 comm="mysql$
Jul 4 02:26:23 localhost kernel: [ 1067.896340] audit: type=1400 audit(1499149583.012:16): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1446/status" pid=1446 comm="mysqld" reque$
Jul 4 02:31:19 localhost kernel: [ 1364.640301] perf interrupt took too long (5248 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
Jul 4 02:37:26 localhost kernel: [ 1731.575398] audit: type=1400 audit(1499150246.686:17): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1540/status" pid=1540 comm="mysqld" reque$
Jul 4 02:37:26 localhost kernel: [ 1731.575508] audit: type=1400 audit(1499150246.686:18): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=1540 comm="mysql$
Jul 4 02:37:26 localhost kernel: [ 1731.575596] audit: type=1400 audit(1499150246.686:19): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/1540/status" pid=1540 comm="mysqld" reque$
Jul 4 02:42:49 localhost kernel: [ 2054.276362] perf interrupt took too long (10122 > 10000), lowering kernel.perf_event_max_sample_rate to 12500
Jul 4 04:00:02 localhost kernel: [ 6687.106794] perf interrupt took too long (20184 > 20000), lowering kernel.perf_event_max_sample_rate to 6250
很快就会编辑更多信息。
最佳答案
转到“wp-config.php”并将“WP_DEBUG”设置为 true，如下例所示:
define('WP_DEBUG', true);
现在刷新前端和后端页面以便能够看到 PHP 错误。
您还可以转到管理区域、设置、固定链接，然后再次单击“保存”按钮。这将覆盖 .htaccess 文件。
你可以安装一个日志服务，在google上搜索logly或者sentry。这些也可能有帮助。
关于php - 升级 PHP/MySQL 后 WordPress 管理仪表板挂起，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44899184/