我的网络服务器 CENTOS5 不断出现内存问题。
-bash: fork: Cannot allocate memory
在我的网站页面上我得到...
Can't create a new thread (errno 12); if you are not out of available memory, you can
consult the manual for a possible OS-dependent bug in /opt/lampp/htdocs/toplogin.php on line 36
Could not connect: Can't create a new thread (errno 12); if you are not out of
available memory, you can consult the manual for a possible OS-dependent bug
我有 4GB 的内存，但流量不是很大，不知道到底发生了什么……
[root@s15433245 lampp]# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 10364 748 ? Ss Aug03 0:16 init [3]
postfix 1470 0.0 0.0 54224 2360 ? S Aug03 0:00 tlsmgr -l -t unix -u
root 6029 0.0 0.0 46140 4184 ? SLs Aug31 0:00 proftpd: 74.84.118.99:3419: USER userftp
root 11890 0.0 0.4 69480 18808 ? Ss Sep02 1:50 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
root 11910 0.0 0.0 9984 1412 ? S Sep02 0:00 /bin/sh /opt/lampp/bin/mysqld_safe --datadir=/opt/lampp/var/mysql --pid-file=/opt/lampp/var/mysql/s15433245.onli
nobody 12177 0.0 0.3 48940 12772 ? S Sep02 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 12272 0.3 0.8 215536 34452 ? Sl Sep02 65:28 /opt/lampp/sbin/mysqld --basedir=/opt/lampp --datadir=/opt/lampp/var/mysql --plugin-dir=/opt/lampp/lib/mysql/plu
root 13931 0.0 0.0 96588 3796 ? Ss 08:00 0:00 sshd: root@pts/0
root 13933 0.0 0.0 12212 1788 pts/0 Ss 08:00 0:00 -bash
root 16321 0.0 0.0 46140 4184 ? SLs Sep08 0:00 proftpd: 74.84.118.99:6751: USER userftp
root 16322 0.0 0.0 46144 4184 ? SLs Sep08 0:00 proftpd: 74.84.118.99:6761: USER userftp
root 16342 0.0 0.0 46140 4184 ? SLs Sep08 0:00 proftpd: 74.84.118.99:6782: USER userftp
root 16345 0.0 0.0 46136 4180 ? SLs Aug19 0:00 proftpd: 75.5.72.144:52094: USER userftp
root 16346 0.0 0.0 46136 4180 ? SLs Aug19 0:00 proftpd: 75.5.72.144:52115: USER userftp
root 17440 0.0 0.0 12780 772 ? S<s Aug03 0:00 /sbin/udevd -d
root 17557 0.0 0.0 46136 4184 ? SLs Aug15 0:00 proftpd: 74.84.118.99:4172: USER userftp
root 17559 0.0 0.0 46132 4184 ? SLs Aug15 0:00 proftpd: 74.84.118.99:4195: USER userftp
nobody 19502 0.2 0.4 69984 17280 ? S 13:56 0:01 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
root 19644 0.0 0.0 5924 624 ? Ss Aug03 0:52 syslogd -m 0
root 21647 0.0 0.0 46132 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4128: USER userftp
root 21648 0.0 0.0 46136 4188 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4140: USER userftp
root 21749 0.0 0.0 46136 4188 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4206: USER userftp
root 21756 0.0 0.0 46136 4188 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4234: USER userftp
root 22095 0.0 0.0 46132 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4805: USER userftp
root 22126 0.0 0.0 46136 4188 ? SLs Aug16 0:00 proftpd: 74.84.118.99:4892: USER userftp
root 23670 0.0 0.0 46128 4176 ? SLs Aug16 0:00 proftpd: 74.84.118.99:6703: USER userftp
root 23912 0.0 0.0 46132 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:6988: USER userftp
root 23914 0.0 0.0 46128 4176 ? SLs Aug16 0:00 proftpd: 74.84.118.99:1365: USER userftp
root 24011 0.0 0.0 46132 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:1396: USER userftp
root 24015 0.0 0.0 46132 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:1421: USER userftp
root 24033 0.0 0.0 46136 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:1438: USER userftp
root 25900 0.0 0.0 46136 4180 ? SLs Aug23 0:00 proftpd: 74.84.118.99:34857: USER userftp
root 26130 0.0 0.0 46140 4184 ? SLs Aug23 0:00 proftpd: 74.84.118.99:34873: USER userftp
root 26262 0.0 0.0 46144 4188 ? SLs Aug23 0:00 proftpd: 74.84.118.99:34880: USER userftp
nobody 28389 0.3 0.4 70152 17416 ? S 13:43 0:04 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
root 28399 0.0 0.0 62640 1208 ? Ss Aug03 1:24 /usr/sbin/sshd
root 30128 0.0 0.0 54164 2304 ? Ss Aug03 0:57 /usr/libexec/postfix/master
postfix 30153 0.0 0.0 54412 2432 ? S Aug03 0:06 qmgr -l -t fifo -u
postfix 30231 0.0 0.0 54228 2264 ? S 14:02 0:00 pickup -l -t fifo -u -c -o content_filter smtp:127.0.0.1:10027
root 30257 0.0 0.0 20888 1188 ? Ss Aug03 0:15 crond
root 30268 0.0 0.0 46752 812 ? Ss Aug03 0:00 /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -n 2
root 30281 0.0 0.0 46752 540 ? S Aug03 0:00 /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -n 2
root 30324 0.0 0.0 46136 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2005: USER userftp
root 30462 0.0 0.0 46136 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2015: USER userftp
root 30466 0.0 0.0 46136 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2083: USER userftp
root 30471 0.0 0.0 45352 3228 ? Ss Aug16 0:00 proftpd: 74.84.118.99:2118: USER userftp
root 30478 0.0 0.0 46136 4184 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2196: USER userftp
root 30479 0.0 0.0 46132 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2249: USER userftp
root 30485 0.0 0.0 46132 4180 ? SLs Aug16 0:00 proftpd: 74.84.118.99:2566: USER userftp
root 30503 0.0 0.0 46140 4188 ? SLs Aug16 0:00 proftpd: 74.84.118.99:8057: USER userftp
root 30554 0.0 0.0 46132 4184 ? SLs Aug12 0:00 proftpd: 74.84.118.99:3931: USER userftp
root 30580 0.0 0.0 46128 4180 ? SLs Aug12 0:00 proftpd: 74.84.118.99:3994: USER userftp
root 30683 0.0 0.0 46012 3984 ? SLs Aug16 0:00 proftpd: 74.84.118.99:8751: USER userftp
root 31775 0.0 0.0 46012 3980 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9220: USER userftp
root 31778 0.0 0.0 46016 3984 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9247: USER userftp
root 31781 0.0 0.0 46012 3980 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9266: USER root
root 31784 0.0 0.0 46016 3984 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9278: USER userftp
root 31812 0.0 0.0 46012 3980 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9355: USER root
root 31831 0.0 0.0 46012 3980 ? SLs Aug16 0:00 proftpd: 74.84.118.99:9374: USER root
root 31967 0.0 0.0 46140 4184 ? SLs Aug30 0:00 proftpd: 74.84.118.99:23694: USER userftp
nobody 31988 0.0 0.4 69852 17088 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32019 0.0 0.4 69852 17084 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32020 0.0 0.3 69480 15532 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32023 0.0 0.4 69888 17244 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32039 0.0 0.4 69852 16968 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32041 0.0 0.3 69480 15524 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32044 0.0 0.3 69480 15536 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32063 0.0 0.4 69852 17156 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32066 0.0 0.4 69852 16960 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32067 0.0 0.4 70120 17260 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32068 0.0 0.4 70120 16968 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32070 0.0 0.4 70120 17224 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32099 0.0 0.4 69744 17344 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32101 0.0 0.3 69612 15612 ? S 14:03 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32115 0.0 0.3 69480 15500 ? S 14:07 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32116 0.0 0.3 69480 15500 ? S 14:07 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32117 0.0 0.0 0 0 ? Z 14:07 0:00 [httpd] <defunct>
nobody 32118 0.0 0.3 69480 15516 ? S 14:07 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
nobody 32120 0.0 0.3 69480 15496 ? S 14:07 0:00 /opt/lampp/bin/httpd -k start -DSSL -DPHP5 -E /opt/lampp/logs/error_log
root 32122 0.0 0.0 10740 992 pts/0 R+ 14:07 0:00 ps aux
root 32512 0.0 0.0 21660 984 ? Ss Aug16 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid
内存使用情况
free -m
total used free shared buffers cached
Mem: 4096 362 3733 0 0 0
-/+ buffers/cache: 362 3733
我刚刚在我的日志中发现了这一点。
Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 138240
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 138240
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
答案1
ulimit -a将显示对进程施加的资源限制。如果您发现任何可疑的限制，请将其增加。如果您想在此处发布该命令的输出，我可以进一步提供帮助。另请检查 /etc/security/limits.conf。
在发布 ulimit -a 输出后，我认为这不一定是操作系统级别的问题。您是否检查过 apache/php 配置以查看是否存在任何内存限制？Web 服务通常具有相当严格的每个线程限制，因此这是我怀疑的下一个罪魁祸首。除非您对安全性非常有信心，否则我不鼓励在此处发布所有配置文件，但请检查文档以了解是否存在线程/内存限制，希望您能找到罪魁祸首。