mod_slotmem.so: undefined symbol: unixd_config error trying to start apache2.4.6

[daveposh]

Trying to start apache2.4.6 using the mod_cluster binaries 1.2.6 mod_cluster-1.2.6.Final-linux2-x64-so.tar.gz  and I get the following error on CentOS 6.3:

Cannot load modules/mod_slotmem.so into server: /apps/common/apache2.4.6/modules/mod_slotmem.so: undefined symbol: unixd_config

[mbabacek]

I'm sorry David, IMHO the problem is the older version of httpd APXS the binaries you downloaded were built with.

I've prepared this build for you: https://www.dropbox.com/s/g3uib9n7yrkp4kg/mod_cluster-1.2.6.Final-x86_64-httpd-2.4.6-apr-util-1.5.2-apr-1.4.6-RHEL6.5.zi…

You might try if it works for you and then, if you are worried about running binaries from strangers, you might want to build them yourself from our GitHub tree.

The linked zip contains all mod_cluster binaries and a hashsum file. It was built on RHEL 6.5, so I hope you won't hit a gLibc problem with your Centos 6.3 :-D

HTH

K

[rhusar]

Correct, for httpd 2.4.x you need to use 1.3.x which needs to be built from source:

mod_cluster/native at master · modcluster/mod_cluster · GitHub

The release will be cut shortly and binaries will be provided.

[mbabacek]

That's a somewhat misleading statement, one can use mod_cluster 1.2.6 with httpd 2.4.x just fine if one wants to. The only concerns are that the binaries provided in the download section are not suitable for that and last but not least, it's a quite untested combination to date.

David could use those dropbox-linked for testing and build himself mod_cluster 1.2.6 for production.

[mbabacek]

BTW: Watch out for mod_slotmem_shm.so, it appears it does not like to be loaded with mod_cluster modules at the same time...

[rhusar]

Correct, just note that there might be no more 1.2.x community releases thus 1.2.x community binaries might never be compatible with the new httpd version. This is undecided though.

The releases are backward compatible, so its OK to use newer native httpd modules in version 1.3.x with servlet container modules in version 1.2.x.

[marcodanti]

If it can be of any help, I can confirm that I am using mod_cluster 1.2.6 (built from sources) with httpd 2.4.6, on SLES-11.

[daveposh]

Thanks everyone pulled the source from github compiled the binaries using this documentation http://docs.jboss.org/mod_cluster/1.0.0/html/building.html

Everything works thanks!!

[rhusar]

Good to hear.

We will provide community binaries of 1.3.0.Final in 1-2 weeks time with some stability improvements that will also work with 2.4.6 out of box. Stay tuned.

[wf_user]

Hi,

do you provide a Solaris 32 bit sparc version for the 1.3.1 version of mod_cluster  as for 1.2.x versions ?

[rhusar]

Currently the last SPARC release was for the 1.2.x branch. mod_cluster 1.2.6.Final bin Downloads - JBoss Community

The 1.3.1 was released only for x64 solarises. mod_cluster 1.3.1.Final bin Downloads - JBoss Community

Let me see what is the state of the SPARCs builds.

[jfclere]

I think I have found the problem that prevents the 32 bits solaris to build.

Try http://downloads.jboss.org/mod_cluster/1.3.1.Final/solaris10-sun4v/mod_cluster-1.3.1.Final-solaris10-sun4v-so.tar.gz

[jplorier]

Hi,

I'm using 1.3.1 binaries with http 2.4.6 on Centos 7 and still get the simbol error. Do I need to compile the sources in order to use mod_cluster with 2.4.6?

Regards

[jfclere]

yes recompiling from the source should fix the problem (note that master is GitHub - modcluster/mod_proxy_cluster: mod_cluster is an intelligent Apache httpd-based load-balancer)

[mbabacek]

Dear Juan, if it's of any help to you, there is a short tutorial on compiling master with CMAKE:

Examples – mod_cluster