☰

Ubuntu 伺服器，太多 apache2 執行個體運行最大化 CPU

tag-icon • tag-icon apache-2.2 ubuntu
Ubuntu 伺服器，太多 apache2 執行個體運行最大化 CPU

我不喜歡系統管理，但我知道伺服器何時達到極限。所有 http 請求都需要很長時間才能完成。我正在附加在我的伺服器上運行的“頂級”進程。

這是正常的嗎？我究竟做錯了什麼？

（如果需要，我可以貼上更多文件。）

請注意，該伺服器用於測試目的，目前唯一訪問它的用戶是我。

運行“top”顯示 Apache 進程過多

另外，這是我的 apache2.conf 檔案：

PidFile ${APACHE_PID_FILE}

Timeout 300

KeepAlive On

MaxKeepAliveRequests 100

KeepAliveTimeout 5

<IfModule mpm_prefork_module>
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    MaxClients          150
    MaxRequestsPerChild   0
</IfModule>


<IfModule mpm_worker_module>
    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          150
    MaxRequestsPerChild   0
</IfModule>

<IfModule mpm_event_module>
    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          150
    MaxRequestsPerChild   0
</IfModule>

User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}

AccessFileName .htaccess

<Files ~ "^\.ht">
    Order allow,deny
    Deny from all
    Satisfy all
</Files>

DefaultType None

HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log

LogLevel warn

Include mods-enabled/*.load
Include mods-enabled/*.conf

Include ports.conf

LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent

Include conf.d/

Include sites-enabled/

這是伺服器狀態的輸出：

Apache Server Status for localhost

Server Version: Apache/2.2.22 (Debian) PHP/5.4.39-0+deb7u2 mod_wsgi/3.3 Python/
    2.7.3
Server Built: Jul 24 2014 15:34:00

-------------------------------------------------------------------------------

Current Time: Tuesday, 23-Jun-2015 11:38:02 BST
Restart Time: Tuesday, 23-Jun-2015 11:33:36 BST
Parent Server Generation: 0
Server uptime: 4 minutes 25 seconds
Total accesses: 54 - Total Traffic: 58 kB
CPU Usage: u25.08 s1.64 cu0 cs0 - 10.1% CPU load
.204 requests/sec - 224 B/second - 1099 B/request
4 requests currently being processed, 3 idle workers

W_WW__..W.......................................................
................................................................
................................................................
................................................................

Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process


Srv   PID  Acc M CPU   SS   Req  Conn Child Slot    Client            VHost                                      Request
0-0  13852 0/4 _ 5.07 2218 90    0.0  0.00  0.00 11.11.11.111 server1.project NULL
           /4
           22/

1-0  13854 22/ W 5.87 2235 0     42.2 0.04  0.04 11.11.11.111 server2.project2   GET /ajax/period_stats/?object_id=16106&period_unit=month&perio
           22

2-0  13855 0/9 _ 4.87 2211 460   0.0  0.00  0.00 11.11.11.111 server1.project NULL
           /9

3-0  13857 0/8 _ 4.54 2218 341   0.0  0.01  0.01 11.11.11.111 server1.project NULL
           /8

4-0  13858 6/6 W 4.61 2224 0     1.6  0.00  0.00 11.11.11.111 server2.project2   GET /ajax/period_stats/?object_id=16110&period_unit=month&perio
           /6

5-0  13878 3/3 W 4.28 2224 0     0.5  0.00  0.00 11.11.11.111 server2.project2   GET /ajax/period_stats/?object_id=16104&period_unit=hour&period
           /3

6-0  13881 0/0 W 0.00 2203 0     0.0  0.00  0.00 11.11.11.111 server2.project2   GET /ajax/period_stats/?object_id=16104&period_unit=hour&period
           /0

7-0  13882 0/2 _ 5.27 2193 12446 0.0  0.00  0.00 11.11.11.111 server1.project NULL
           /2

8-0  13885 0/1 _ 0.01 1086 1     0.0  0.00  0.00 localhost    server1.project GET /server-status HTTP/1.0
           /1

9-0  13886 0/0 W 0.00 0    0     0.0  0.00  0.00 ::1          server1.project GET /server-status HTTP/1.0
           /0

10-0 13887 0/1 _ 5.92 1317 14928 0.0  0.00  0.00 11.11.11.111 server2.project2   POST /core/user/exits/ HTTP/1.1
           /1

11-0 13888 0/1 _ 0.00 62   1     0.0  0.00  0.00 localhost    server1.project GET /server-status HTTP/1.0
           /1

答案1

當您使用 prefork 模組並且伺服器僅用於測試時，您可以更改這些值：看到您有 2GB RAM，我會將其設定為更小的值：

<IfModule mpm_prefork_module>
    StartServers          2
    MinSpareServers       2
    MaxSpareServers       4
    MaxClients           16
    MaxRequestsPerChild  50
</IfModule>

這些是「隨機」數字，因為我不知道您的應用程式或您正在管理的數據，但它應該足以進行影響較小的測試。如果您要上線並期望有更多用戶，您將需要調整該配置。

您可以在 Apache 文件中看到這些值的解釋，但簡短的版本是，使用 prefork MPM Apache 將建立一個進程池來服務請求，使用建議的配置該池會更小。

相關內容