Thank you, @jess. I just checked MySQL and Sphinx. mysqld is running. However, Sphinx dies right after starting.
[root@kaltura2 bin]# /etc/init.d/kaltura-sphinx status
searchd is stopped
[root@kaltura2 bin]# /etc/init.d/kaltura-sphinx start
Starting searchd: Sphinx 2.2.1-id64-dev (r4097)
Copyright © 2001-2013, Andrew Aksyonoff
Copyright © 2008-2013, Sphinx Technologies Inc (http://sphinxsearch.com)
using config file ‘/opt/kaltura/app/configurations/sphinx/kaltura.conf’…
listening on all interfaces, port=9312
WARNING: index ‘kaltura_base’: no fields configured (use rt_field directive) - NOT SERVING
WARNING: index ‘kaltura_kuser_base’: no fields configured (use rt_field directive) - NOT SERVING
precaching index ‘kaltura_entry’
precaching index ‘kaltura_category’
precaching index ‘kaltura_kuser’
precaching index ‘kaltura_category_kuser’
precaching index ‘kaltura_cue_point’
precaching index ‘kaltura_entry_distribution’
precaching index ‘kaltura_caption_item’
precaching index ‘kaltura_tag’
precaching index ‘kaltura_metadata’
precached 9 indexes in 0.097 sec
[root@kaltura2 bin]# /etc/init.d/kaltura-sphinx status
searchd is stopped