记一次服务器cpu 100%

附： php-fpm - 启动参数及重要配置详解

1、使用top命令

top

查看占用cpu高的进程

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                       
13827 apache    20   0  297m  11m 3688 S 98.4  0.0   0:00.88 php-fpm     

2、使用strace跟踪

strace -p 13827

发现大量超时

poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "$-1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 5
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
sendto(5, "*2\r\n$3\r\nGET\r\n$28\r\n___user_pos_up"..., 48, MSG_DONTWAIT, NULL, 0) = 48
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "$-1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 5
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
sendto(5, "*2\r\n$3\r\nGET\r\n$28\r\n___user_pos_up"..., 48, MSG_DONTWAIT, NULL, 0) = 48
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "$-1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 5
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
sendto(5, "*2\r\n$3\r\nGET\r\n$28\r\n___user_pos_up"..., 48, MSG_DONTWAIT, NULL, 0) = 48
poll([{fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 0 (Timeout)
poll([{fd=5, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=5, revents=POLLIN}])
recvfrom(5, "$-1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 5

3、设置php-fpm.conf的超时时间，打开慢日志

[root@iZ25b738b71Z nginx] whereis php-fpm
php-fpm: /usr/sbin/php-fpm /etc/php-fpm.conf /etc/php-fpm.d /usr/share/man/man8/php-fpm.8.gz
[root@iZ25b738b71Z nginx] whereis php-fpm
php-fpm: /usr/sbin/php-fpm /etc/php-fpm.conf /etc/php-fpm.d /usr/share/man/man8/php-fpm.8.gz
[root@iZ25b738b71Z nginx] vi /etc/php-fpm.conf

注意看php-fpm.conf里有没有参数

request_slowlog_timeout

如果没有

[root@iZ25b738b71Z nginx] cd /etc/php-fpm.d/
[root@iZ25b738b71Z php-fpm.d] vi www.conf

修改参数

request_slowlog_timeout = 2
slowlog = /var/log/php-fpm/www-slow.log

4、接下来查看慢日志，看发生了什么

[root@iZ25b738b71Z php-fpm.d] vi /var/log/php-fpm/www-slow.log

可以排查出问题所在