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Apache is a web server daemon (
httpd). It responds to HTTP requests, and subsequently serves web pages. For example, if one of your visitors requests your domain,
www.example.com, from a web browser, Apache serves the index page for
This interface displays the following heading information:
The version of Apache that runs on the server.
|Server Built||The time and date at which you installed Apache.|
The current time and date.
The time and date at which you last restarted the server.
|Parent Server Generation||The number of times that you have restarted Apache gracefully, which causes it to re-read its configuration file. This occurs, for example, whenever you add domains to your server.|
The amount of time over which the server has run.
|Total accesses||The total number of requests for your server.|
|Total Traffic||The total amount of traffic for your server, in Megabytes (MB).|
The total CPU usage and current load percentage (the percentage of the server’s currently-used processing power).
Under the CPU usage, the interface displays the following additional information:
The Scoreboard section displays the following information about each worker on your server:
|Srv||The worker's server number.|
|PID||The operating system’s process ID number.|
The number of requests that this worker has served for this connection, this child, and this slot, separated by forward slashes (/).
For example, 0/2055/7670 indicates the following request data:
The mode of operation. This column displays the following modes:
|CPU||The worker’s CPU usage.|
|SS||The number of seconds since the start of the most recent request.|
|Req||The amount of time that the worker required to process the most recent request, in milliseconds.|
|Conn||The amount of information that the worker transferred to the visitor, in Kilobytes (KB).|
|Child||The total amount of information that the worker transferred, in Kilobytes (KB).|
|Slot||The total amount of information that the slot transferred, in Megabytes (MB).|
|Client||The IP address of the user who requested the data.|
|VHost||The domain name of the server that requested the data.|
The type of request that the server received.
Apache dummy requests
Apache uses dummy requests to wake processes that listen for new connections. A dummy request is an HTTP request that Apache sends to itself. These requests, when Apache uses them without SSL, appear in access log files with the remote address set to the local host (
127.0.0.1 for IPv4 or
::1 for IPv6). These dummy requests are a normal part of Apache's functionality, which you can safely ignore.
Apache's dummy requests cannot use SSL. It is possible that servers with hosts that use SSL can receive noise in the log file that resembles the following:
On a lightly loaded server, this interface frequently shows a high number of dummy connections. This occurs because the feature displays the last request to a worker slot, which is typically a dummy request.
It may also appear that Apache currently handles a high number of
OPTIONS requests when in fact the workers are simply idle.