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authorVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
committerVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
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+What is mod_glusterfs?
+======================
+* mod_glusterfs is a module for apache written for efficient serving of files from glusterfs.
+ mod_glusterfs interfaces with glusterfs using apis provided by libglusterfsclient.
+
+* this README speaks about installation of apache-1.3.x, where x is any minor version.
+
+Prerequisites for mod_glusterfs
+===============================
+Though mod_glusterfs has been written as a module, with an intent of making no changes to the way apache has
+been built, currently following points have to be taken care of:
+
+* module "so" has to be enabled, for apache to support modules.
+* since glusterfs is compiled with _FILE_OFFSET_BITS=64 and __USE_FILE_OFFSET64 flags, mod_glusterfs and apache
+ in turn have to be compiled with the above two flags.
+
+ $ tar xzvf apache-1.3.9.tar.gz
+ $ cd apache-1.3.9/
+ $ # add -D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64 to EXTRA_CFLAGS in src/Configuration.
+ $ ./configure --prefix=/usr --enable-module=so
+ $ cd src
+ $ ./Configure
+ $ cd ../
+ $ make install
+ $ httpd -l | grep -i mod_so
+ mod_so.c
+
+* if multiple apache installations are present, make sure to pass --with-apxs=/path/to/apxs/of/proper/version to configure script while building glusterfs.
+
+Build/Install mod_glusterfs
+===========================
+* mod_glusterfs is provided with glusterfs--mainline--3.0 and all releases from the same branch.
+
+* building glusterfs also builds mod_glusterfs. But 'make install' of glusterfs installs mod_glusterfs.so to
+ glusterfs install directory instead of the apache modules directory.
+
+* 'make install' of glusterfs will print a message similar to the one given below, which is self explanatory.
+ Make sure to use apxs of proper apache version in case of multiple apache installations. This will copy
+ mod_glusterfs.so to modules directory of proper apache version and modify the appropriate httpd.conf to enable
+ mod_glusterfs.
+
+**********************************************************************************************
+* TO INSTALL MODGLUSTERFS, PLEASE USE,
+* apxs -n mod_glusterfs -ia /usr/lib/glusterfs/1.4.0pre2/apache-1.3/mod_glusterfs.so
+**********************************************************************************************
+
+Configuration
+=============
+* Following configuration has to be added to httpd.conf.
+
+ <Location "/glusterfs">
+ GlusterfsLogfile "/var/log/glusterfs/glusterfs.log"
+ GlusterfsLoglevel "warning"
+ GlusterfsVolumeSpecfile "/etc/glusterfs/glusterfs-client.spec"
+ GlusterfsCacheTimeout "600"
+ GlusterfsXattrFileSize "65536"
+ SetHandler "glusterfs-handler"
+ </Location>
+
+* GlusterfsVolumeSpecfile (COMPULSORY)
+ Path to the the glusterfs volume specification file.
+
+* GlusterfsLogfile (COMPULSORY)
+ Path to the glusterfs logfile.
+
+* GlusterfsLoglevel (OPTIONAL, default = warning)
+ Severity of messages that are to be logged. Allowed values are critical, error, warning, debug, none
+ in the decreasing order of severity.
+
+* GlusterfsCacheTimeOut (OPTIONAL, default = 0)
+ Timeout values for glusterfs stat and lookup cache.
+
+* GlusterfsXattrFileSize (OPTIONAL, default = 0)
+ Files with sizes upto and including this value are fetched through the extended attribute interface of
+ glusterfs rather than the usual open-read-close set of operations. For files of small sizes, it is recommended
+ to use extended attribute interface.
+
+* With the above configuration all the requests to httpd of the form www.example.org/glusterfs/path/to/file are
+ served from glusterfs.
+
+Miscellaneous points
+====================
+* httpd by default runs with username "nobody" and group "nogroup". Permissions of logfile and specfile have to
+ be set suitably.
+
+* Since mod_glusterfs runs with permissions of nobody.nogroup, glusterfs has to use only login based
+ authentication. See docs/authentication.txt for more details.
+
+* To copy the data served by httpd into glusterfs mountpoint, glusterfs can be started with the
+ volume-specification file provided to mod_glusterfs. Any tool like cp can then be used.
+
+* To run in gdb, apache has to be compiled with -lpthread, since libglusterfsclient is multithreaded.
+ If not on Linux gdb runs into errors like:
+ "Error while reading shared library symbols:
+ Cannot find new threads: generic error"
+
+* when used with ib-verbs transport, ib_verbs initialization fails.
+ reason for this is that apache runs as non-privileged user and the amount of memory that can be
+ locked by default is not sufficient for ib-verbs. to fix this, as root run,
+
+ # ulimit -l unlimited
+
+ and then start apache.
+
+TODO
+====
+* directory listing for the directories accessed through mod_glusterfs.