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From David Benfell <dbenf...@gmail.com>
Subject Re: [users@httpd] Apache won't start, strace output enclosed
Date Fri, 17 Jan 2014 08:22:48 GMT
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On 01/16/2014 11:46 PM, Mathijs Schmittmann wrote:
> ----- Original Message ----- Hi all,
> 
> Ack!
> 
> This is apache 2.2.25 compiled from source but on a CentOS 6.5 
> system. Notably, I included all modules in the build.
> 
>> You might want to start to build with a minimal set of modules, 
>> to exclude any of them from being the cause. Why did you compile 
>> with all modules to start with?
> 
This is a build that *was* working. I've been using it--I see (see
below) since December.
> 
> I was trying to add a subdomain, ran into memory allocation 
> problems and so tweaked the settings accordingly. Here are the 
> current settings and I have no idea how sensible they are:
> 
> <IfModule prefork.c> StartServers       4 MinSpareServers    4 
> MaxSpareServers   64 ServerLimit       512 MaxClients        512 
> MaxRequestsPerChild  512 </IfModule> <IfModule worker.c> 
> StartServers         4 MaxClients         512 MinSpareThreads 32
> MaxSpareThreads     64 ThreadsPerChild     16 MaxRequestsPerChild
> 0 </IfModule>
> 
>> This depends on which MPM you are currently running, see your 
>> httpd -V output for this information. Obviously the specific 
>> settings will be different in each usecase, depending on load
>> and resources available.
> 
This returns:

Server version: Apache/2.2.25 (Unix)
Server built:   Dec  2 2013 08:47:03
Server's Module Magic Number: 20051115:33
Server loaded:  APR 1.4.8, APR-Util 1.5.2
Compiled using: APR 1.4.8, APR-Util 1.5.2
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/usr/local/apache2"
 -D SUEXEC_BIN="/usr/local/apache2/bin/suexec"
 -D DEFAULT_PIDLOG="logs/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="logs/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

So I can ditch the worker section?

> 
>> The last write call shows that its logging an error to the 
>> errorlog, are you sure you have looked at the right errorlog?
>> You might want to try to 'strace -s 4096 ...' so the entire
>> message is captured in the trace.
> 
Thanks for the strace trick:
                              = 0
munmap(0x7fbfdc208000, 4096)            = 0
write(43, "[Thu Jan 16 23:57:11 2014] [error] Unable to configure
verify locations for client authentication\n", 98) = 98
exit_group(1)                           = ?

I gather this is an SSL problem. Here is the section of that
configuration that is changed. It is a new certificate (that includes
the new subdomain):

	Include /etc/httpd/conf/sites-available/all-ssl-common
	SSLCertificateFile
/big/www/ssl/parts-unknown.org/munich/parts-unknown.org.crt
	SSLCertificateKeyFile
/big/www/ssl/parts-unknown.org/munich/parts-unknown.org.key
	SSLCertificateChainFile
/big/www/ssl/parts-unknown.org/munich/sub.class2.server.ca.pem
	SSLCACertificateFile /big/www/ssl/parts-unknown.org/munich/ca.pem

These files all exist. all-ssl-common is unchanged. It contains:

	SSLEngine on

	SSLProtocol -ALL +SSLv3 +TLSv1 +TLSv1.2
	SSLCipherSuite
ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM;
	SSLHonorCipherOrder on
	SSLCompression Off
	#SSLCipherSuite RC4-SHA:HIGH:!ADH
	SSLInsecureRenegotiation off
	SSLOptions StdEnvVars

	BrowserMatch "MSIE [2-6]" \
		nokeepalive ssl-unclean-shutdown \
		downgrade-1.0 force-response-1.0
	BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown

Thanks!
- -- 
David Benfell
see https://parts-unknown.org/node/2 if you don't understand the
attachment

- -- 
David Benfell
see https://parts-unknown.org/node/2 if you don't understand the
attachment
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