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503 服务不可用。Apache 每 7-10 天崩溃一次

tag-icon • tag-icon apache-2.2 reverse-proxy mod-proxy 503-error
503 服务不可用。Apache 每 7-10 天崩溃一次

我在 Ubuntu 14.04 上使用 Apache 服务器。为了将所有请求从 mypage.com 重定向到 mypage.com:8080/myapp，我使用了 mod_proxy。我的 000-default.conf 如下所示：

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    #ServerName www.example.com

    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
    ProxyPass / http://mypage.com:8080/myapp/ retry=0 timeout=10 Keepalive=On
    ProxyPassReverse / http://mypage.com:8080/myapp/

    ServerName mypage.com

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
 </VirtualHost>

这就是我的 ports.conf

# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf

Listen 80
Listen 81

<IfModule ssl_module>
    Listen 443
</IfModule>

<IfModule mod_gnutls.c>
    Listen 443
</IfModule>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

一切运行正常，直到几天后我总是收到 503 Service Unavailable 错误页面。它显示：

“由于维护停机或容量问题，服务器暂时无法满足您的请求。请稍后再试”

.错误发生之前，error.log 中会写入以下内容

[Sun Oct 25 21:22:27.779422 2015] [core:error] [pid 14595] [client 38.104.233.252:45239] AH00126: Invalid URI in request GET HTTP/1.1 HTTP/1.1
[Mon Oct 26 02:30:20.925532 2015] [core:error] [pid 15416] [client 190.252.95.102:53508] AH00126: Invalid URI in request GET: index.php HTTP/1.0
[Mon Oct 26 08:22:27.771751 2015] [proxy:error] [pid 15402] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
[Mon Oct 26 08:22:27.774040 2015] [proxy:error] [pid 15402] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
[Mon Oct 26 08:22:27.774111 2015] [proxy_http:error] [pid 15402] [client 5.28.160.27:48692] AH01114: HTTP: failed to make connection to backend: mypage.com
[Mon Oct 26 10:55:51.655213 2015] [proxy:error] [pid 15406] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
[Mon Oct 26 10:55:51.655422 2015] [proxy:error] [pid 15406] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
[Mon Oct 26 10:55:51.655470 2015] [proxy_http:error] [pid 15406] [client 169.57.5.20:60000] AH01114: HTTP: failed to make connection to backend: mypage.com
[Mon Oct 26 13:32:00.442031 2015] [proxy:error] [pid 15408] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
[Mon Oct 26 13:32:00.442356 2015] [proxy:error] [pid 15408] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
[Mon Oct 26 13:32:00.442413 2015] [proxy_http:error] [pid 15408] [client 217.168.189.15:50222] AH01114: HTTP: failed to make connection to backend: mypage.com, referer: http://mypage.com/admn
[Mon Oct 26 13:32:12.245050 2015] [proxy:error] [pid 15402] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
[Mon Oct 26 13:32:12.245179 2015] [proxy:error] [pid 15402] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
[Mon Oct 26 13:32:12.245190 2015] [proxy_http:error] [pid 15402] [client 217.168.189.15:50225] AH01114: HTTP: failed to make connection to backend: mypage.com, referer: http://mypage.com/admn
[Mon Oct 26 13:34:44.343614 2015] [mpm_prefork:notice] [pid 991] AH00169: caught SIGTERM, shutting down
[Mon Oct 26 13:36:07.703185 2015] [mpm_prefork:notice] [pid 991] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
[Mon Oct 26 13:36:07.708761 2015] [core:notice] [pid 991] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 27 01:20:23.236327 2015] [mpm_prefork:notice] [pid 991] AH00169: caught SIGTERM, shutting down
[Tue Oct 27 01:20:24.265160 2015] [mpm_prefork:notice] [pid 3247] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
[Tue Oct 27 01:20:24.265243 2015] [core:notice] [pid 3247] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 27 01:41:17.177723 2015] [mpm_prefork:notice] [pid 3247] AH00169: caught SIGTERM, shutting down
[Tue Oct 27 01:41:18.219244 2015] [mpm_prefork:notice] [pid 11636] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
[Tue Oct 27 01:41:18.219351 2015] [core:notice] [pid 11636] AH00094: Command line: '/usr/sbin/apache2'

重启机器后，它又恢复正常了。然后在 7-10 天内它又崩溃了。在网上试了很多方法，但最多几周就会出现这个错误。已经挣扎了几个月。SELinux 已禁用。

答案1

8080 端口托管着什么服务？Apache 报告说该端口上没有可以打开的套接字，这就是“服务不可用”的原因，而不是 Apache 的问题。

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