A very wide variety of different messages can appear in the error log. Most look similar to the example above. The error log will also contain debugging output from CGI scripts.
Any information written to stderr by a CGI script will be copied directly to the error log. During testing, it is often useful to continuously monitor the error log for any problems. On Unix systems, you can accomplish this using:.
The LogLevel directive allows you to specify a log severity level on a per-module basis. In this way, if you are troubleshooting a problem with just one particular module, you can turn up its logging volume without also getting the details of other modules that you're not interested in. Do this by specifying the name of the module in your LogLevel directive:. The server access log records all requests processed by the server.
The location and content of the access log are controlled by the CustomLog directive. The LogFormat directive can be used to simplify the selection of the contents of the logs.
This section describes how to configure the server to record information in the access log. Of course, storing the information in the access log is only the start of log management.
The next step is to analyze this information to produce useful statistics. Log analysis in general is beyond the scope of this document, and not really part of the job of the web server itself. For more information about this topic, and for applications which perform log analysis, check the Open Directory.
The CustomLog directive now subsumes the functionality of all the older directives. The format of the access log is highly configurable. The format is specified using a format string that looks much like a C-style printf 1 format string. Some examples are presented in the next sections. This defines the nickname common and associates it with a particular log format string. The format string consists of percent directives, each of which tell the server to log a particular piece of information.
Literal characters may also be placed in the format string and will be copied directly into the log output. The quote character " must be escaped by placing a backslash before it to prevent it from being interpreted as the end of the format string.
The CustomLog directive sets up a new log file using the defined nickname. The filename for the access log is relative to the ServerRoot unless it begins with a slash. This standard format can be produced by many different web servers and read by many log analysis programs. The log file entries produced in CLF will look something like this:. Another commonly used format string is called the Combined Log Format. It can be used as follows.
This format is exactly the same as the Common Log Format, with the addition of two more fields. The access log under this format will look like:. Multiple access logs can be created simply by specifying multiple CustomLog directives in the configuration file.
For example, the following directives will create three access logs. The first contains the basic CLF information, while the second and third contain referer and browser information.
This example also shows that it is not necessary to define a nickname with the LogFormat directive. Instead, the log format can be specified directly in the CustomLog directive. There are times when it is convenient to exclude certain entries from the access logs based on characteristics of the client request.
This is easily accomplished with the help of environment variables. First, an environment variable must be set to indicate that the request meets certain conditions. This is usually accomplished with SetEnvIf. Some examples:. On looking at the files using C Panel, the culprit appears to be an 8. I have no idea why in the last month this has accumulated such a huge number of errors however my website has been extremely busy in the last few weeks, in terms of visitor numbers.
My priority right now is to clear out the error-log to free up some much-needed web space. I am feeling a bit desperate, so any help will be appreciated. I will add that I am a website owner, not a Webmaster, and I'm afraid I am a novice so a plain English explanation will be appreciated. I have attached a picture of what I am seeing when I look in my file directory on CPanel. I would guess I cannot examine the contents of the file because there is so much in there - over 8 Gig.
I am desperate to clear it out but I cannot figure out how. Nick57 Well-Known Member. It is a good thing to keep an eye of this file. Good luck. I did import the error log file to my local disk but unfortunately I could not open the file with notepad or anything else - I presume because of the size of it over 8 Gig.
Sorry for my ignorance, I'm not much of a Webmaster. As you say, I do need to find out where all of these errors are coming from and hopefully fix the problem. Check it then every other day, or browse around on your website and see if the file grows, then you know for sure something is wrong. And thank you so much for confirming that I can delete the file from Cpanel and it will regenerate as new errors appear - that's good to know, I can relax a bit now!
I appreciate your help Nick. It's not a problem because I can still use it to view the new error logs which will no doubt continue to stream in whilst I'm trying to find out what's causing them.
I had a huge amount of traffic to my website last month which may have done it. Downloads mh-nexus If you start it go to View, Visible columns, choose only text! Another attempt might be to get this editor, install it, view your file and remove the program after 30 days.
Last edited: Nov 29, Since I last spoke to you I got in touch with my web host and I've told them about the huge number of error logs which I have discovered and which have appeared in the last few weeks - just to see if they have an opinion.
A few weeks ago they got in touch with me and told me I had run out of web space - I was very surprised because I hadn't added much, just a few brief blog posts. I purchased the extra web space another 15Gigs and then a couple of days ago I got yet another message from them telling me once again that I had no web space left, so I had to purchase even more.
All the while I am completely baffled because I have not been adding stuff. So I have inadvertently and perhaps unnecessarily spent money on the extra web space, not realising it might be this weird error log nonesense this is where I am a novice. Oh well, you live and learn. Perhaps they can downgrade you back as you have found the culprit, shouldn't be a problem for them.
I will look into it though. But here is another thought - the error log is under my public. I don't think that's a normal place for an apache log file, so these must be PHP logs. Log Browser assists you in troubleshooting issues with your websites by parsing the web server logs and displaying relevant warnings and error messages in the Plesk interface. On Windows, the information from the IIS log is displayed.
In addition, you can add any custom log file from you web site directory to track it in the Log Browser, as described below. You will be presented with a list of messages gathered from the logs.
By default, the Log Browser displays messages present in the monitored logs at the moment of opening. If you want to refresh the list with messages added after opening the Log Browser, click Refresh.
Alternatively, if you want to have new messages continuously added to the list, click Start real-time updates. To select the logs from which you want to view messages, click the icon, and select the desired logs from the menu. The list of all tracked log files will be displayed. Here you can click a log file name to view the file content directly in the Log Browser. You can click the icon next to a log file to open it for viewing in a separate window, or the icon to download it. You can delete log files that have been rotated log files that have not yet been rotated cannot be removed.
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