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Subject [Bug 54519] New: httpd already running
Date Sat, 02 Feb 2013 09:09:20 GMT

            Bug ID: 54519
           Summary: httpd already running
           Product: Apache httpd-2
           Version: 2.2.22
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
    Classification: Unclassified

If httpd dies and leaves behind a pidfile containing a pid which later gets
reused, the httpd refuses to come back up. I've already seen this in
production, where a host has crashed and on coming back up the web server fails
to start because something else has grabed the pid.

To reproduce the problem, do this:

[root@laptop httpd]# pkill -9 httpd
[root@laptop httpd]# pgrep httpd
[root@laptop httpd]# echo 1 > /var/run/httpd/

[root@laptop httpd]# /usr/sbin/httpd -k start
httpd: Could not reliably determine the server's fully qualified domain name,
using fe80::201:4aff:fe5e:5331 for ServerName
httpd (pid 1) already running

This is the version I'm using:

[quick@laptop ~]$ httpd -v
Server version: Apache/2.2.22 (Unix)
Server built:   Apr 30 2012 09:55:05
[quick@laptop ~]$ cat /etc/redhat-release 
Fedora release 17 (Beefy Miracle)

I tested this out on RHEL6 which ships with httpd 2.2.15 and noted that doesn't
suffer the same problem, however I can't see anything in the changelog between
versions 2.2.15 and 2.2.22 which would have caused this problem to occur.

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