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154 Chapter9

Apache for MPE/iX

Major Components

If you are unsuccessful in starting the HTTPD program, you can get more

information about the problem by trying one or more of these

troubleshooting techniques:

1. Look at the output of the JHTTPD spoolﬁle

2. Check the messages in the /APACHE/PUB/logs/error_log ﬁle

3. Verify the syntax of the httpd.conf ﬁle. This catches many, but

not all, syntax problems in the httpd.conf file

:run HTTPD.PUB.APACHE:info=”-t”

4. Try to telnet to Apache’s port (port 80 if you have not modiﬁed the

port directive set in the httpd.conf.sample ﬁle).

If you cannot telnet to Apache’s port, then your problem is not with the

web server. You are not yet reaching your HP 3000 box. A successful

telnet connection should look something like,

telnet yourserver.com 80

Trying...

Connected to yourserver.com.

Escape character is ‘^]’.

Stopping Apache

Apache is stopped by aborting the Apache job from either the CI or the

POSIX shell. Use SHOWJOB to view the Apache job:

JOBNUM STATE IPRI JIN JLIST INTRODUCED JOB NAME

#J16 EXEC 10S LP TUE 10:27A JHTTPD,WWW.APACHE

:ABORTJOB #J16 or :ABORTJOB JHTTPD,WWW.APACHE

Apache can also be stopped using :ABORTJOB from the POSIX shell

:xeq sh.hpbin.sys -L

shell>callci “abortjob #j16” or shell>callci “abortjob jhttp,www.apache”

Error Logging

Apache error logging is useful when trying to start Apache as well as

for monitoring a running web server. Apache logs errors into a log ﬁle

called error_log by default. This log ﬁle resides in the

/APACHE/PUB/logs directory.

The number of messages logged in the error log is set by the LogLevel

directive in the httpd.conf ﬁle. Possible values for LogLevel (by

increasing signiﬁcance) are debug, info, notice, warn, error, crit, alert,

emerg. When a particular level is speciﬁed, messages from all other

levels of higher signiﬁcance are reported as well. For example, when

LogLevel is “info”, then messages with log levels of notice, warn and up

to emerg are also posted.