dcsimg

How's my server doing? Page 2

By Jeremy Reed (Send Email)
Posted Dec 21, 2000


The W represents a child process that is sending a reply. The _ represents a child that is idle, waiting for an incoming connection. Each . represents a potential child that does not exist yet. One slot is displayed for each potential server you have permitted, as per MaxClients

In the example above, only one child was active, while 9 others were waiting in the wings for incoming traffic.

It will additionally tell you how long the server has been up since the last restart, the date and time of that last restart, and there will be a key explaining each of the symbols appearing in the diagram.

If you want more information than this, you need to use ExtendedStatus. By default set to Off, ExtendedStatus gives additional information about what your server is up to. In addition the information above, you'll also get a table listing each child and what it is doing. It will list the child processes that are currently active, and tell you what resource each of them is serving, to whom, and from what virtual host the resources are coming. (Where ''to whom'' means, usually, what IP address.)

For each child, you'll get the PID, how many times that particular child has been accessed, and how much CPU time it is using.

For the server, you'll get a count of total ''hits'' since server restart, CPU usage, and a ''hits per minute'' statistic, as well as a total quantity of data that has been pushed out to clients.

For the purposes of amusing the customer, you really should turn on ExtendedStatus as, without it, it's a little cryptic.

Which brings me to the rest of the above configuration.

Although it might amuse the customer to know who is accessing what resource, you probably don't want this information available to the whole Internet. And, with some customers, you might not even want them knowing this sort of thing. There are questions of user confidentiality to be addressed, but I'll leave that to your own conscience for the moment.

You should restrict access to this service to hosts you know about, and which you think should have access to the information for actual valid reasons. There are voyeurs that get great entertainment from watching server-status displays to see who's looking at what. And this means that they are reloading every 10 seconds to see the latest stats. This imposes an unnecessary load on your server, and does not benefit your or your customer in any way. Hence, we have some Deny and Allow rules set up in the example above, which ensure that nobody is looking at this who should not be.

mod_info

mpd-info is classified as an Extension module, which means that it is not built into your copy of Apache unless you intentionally added it in. That is, it is not built in by default.

mod_info is less interesting to the customer, but is very useful to the system administrator. Especially if, like me, you have a large number of servers that you are responsible for, and you can't for the life of you remember what you've built into each.

Use the following set of directives:


     <Location /server-info>
         SetHandler server-info
         Order deny,allow
         Deny from all
         Allow from .your-domain.com
    </Location>

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