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From André Warnier (tomcat) ...@ice-sa.com>
Subject Re: Mod_jk 1.2.42 fails at startup with shared memory failure
Date Thu, 13 Oct 2016 08:05:41 GMT
On 12.10.2016 17:17, Kreuser, Peter wrote:
> Hi all, Hi Mark,
>
> I see one change in the newest mod_jk (see below), that stops Apache in my configuration:
>
> The discussion on this bug is valid https://bz.apache.org/bugzilla/show_bug.cgi?id=59184,
however I would like to see an explanation o why the shm may fail!
>
> Docker 1.12
>
> Debian Stretch with Apache 2.4.23
> Mod_jk 1.2.42 compiled from source
>
> JK Conf without directives for JkShmFile, JKShmSize (standard values).
>
> Apparently Mod_jk 1.2.42 fails at startup if something goes wrong with shared memory.
If I revert to 1.2.41 apache starts and I only see the older message in the jk_log. Note that
I don't need real loadbalancing, as I have only one worker. If I understood the conf correctly
I still have a balancer with 1 worker, right?
>

Not necessarily, it depends on how you have configured this.

case a)
If your configuration says :

worker.list=balancer
..

worker1.type=ajp13
..

balancer.type=lb
balancer.balance_workers=worker1

then yes, you have a balancer which "balances" only 1 worker (worker1).

case b)
If your configuration says :

workers.list=worker1

worker1.type=ajp13
..

then you have only 1 "real" AJP worker, and it is not "balanced".


> [Wed Oct 12 16:26:28.326947 2016] [jk:emerg] [pid 7] Initializing shm:/etc/apache2/logs/jk-runtime-status.7
errno=22. Unable to start due to shared memory failure. (errno=22 is Invalid Param in jk_shm_open)
> [Wed Oct 12 16:26:28.327012 2016] [jk:emerg] [pid 7] Initializing shm:/etc/apache2/logs/jk-runtime-status.7
errno=22. Unable to start due to shared memory failure. (errno=22 is Invalid Param in jk_shm_open)
>
>
> Any idea and hints? Thank You.
>
> Best regards
>
> Peter
>
> 3572<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3572>
>
> if ((rc = jk_shm_open(jk_shm_file, jk_shm_size, conf->log)) == 0) {
>
> 3573<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3573>
>
> apr_pool_cleanup_register(pconf, conf->log,
>
> 3574<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3574>
>
> jk_cleanup_proc,
>
> 3575<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3575>
>
> apr_pool_cleanup_null);
>
> 3576<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3576>
>
> }
>
> 3577<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3577>
>
> else {
>
> 3578<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3578>
>
> jk_error_exit(JKLOG_MARK, APLOG_EMERG, s, s->process->pool,
>
> 3579<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3579>
>
> "Initializing shm:%s errno=%d. Unable to start due to shared memory failure.",
>
> 3580<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3580>
>
> jk_shm_name(), rc);
>
> 3581<http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=markup#l3581>
>
> }
>
>
>
> http://svn.apache.org/viewvc/tomcat/jk/trunk/native/apache-2.0/mod_jk.c?view=diff&r1=1761418&r2=1761419&pathrev=1761419
>
>
>
> --- tomcat/jk/trunk/native/apache-2.0/mod_jk.c    2016/09/19 10:18:12   1761418
>
> +++ tomcat/jk/trunk/native/apache-2.0/mod_jk.c    2016/09/19 10:23:46   1761419
>
> @@ -3575,9 +3575,9 @@
>
>                                     apr_pool_cleanup_null);
>
>       }
>
>       else {
>
> -        jk_log(conf->log, JK_LOG_ERROR,
>
> -               "Initializing shm:%s errno=%d. Load balancing workers will not function
properly.",
>
> -               jk_shm_name(), rc);
>
> +        jk_error_exit(JKLOG_MARK, APLOG_EMERG, s, s->process->pool,
>
> +                      "Initializing shm:%s errno=%d. Unable to start due to shared memory
failure.",
>
> +                      jk_shm_name(), rc);
>
>       }
>
>       /* we add the URI->WORKER MAP since workers using AJP14
>
>          will feed it */
>
>


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