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Full Discussion: Server Hang in Linux RHEL 5.5
Operating Systems Linux Red Hat Server Hang in Linux RHEL 5.5 Post 302925452 by achenle on Monday 17th of November 2014 09:48:24 AM
Old 11-17-2014
Code:
dmesg | grep -i killed

What's the status of memory overcommit?

Code:
echo /proc/sys/vm/overcommit_memory

For a database server, memory overcommit should be disabled:

Code:
sysctl vm.overcommit_memory=2
echo "vm.overcommit_memory=2" >> /etc/sysctl.conf

You do not want to overcommit memory on a server where long-lived processes WILL use the memory they allocate.

Otherwise the OOM killer will kill important processes, possibly hanging the machine. And when a machine is hung badly, it may not even be able to log anything or record SAR data.

If you find your database or other processes no longer start up after you disable memory overcommit, you were using too much memory in the first place. Buy more RAM and/or add swap.
 

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LEARN ABOUT MOJAVE

net::server::proto::unix5.18

Net::Server::Proto::UNIX(3)				User Contributed Perl Documentation			       Net::Server::Proto::UNIX(3)

NAME

       Net::Server::Proto::UNIX - Net::Server UNIX protocol.

SYNOPSIS

       See Net::Server::Proto.

DESCRIPTION

       Protocol module for Net::Server.  This module implements the UNIX SOCK_STREAM socket type.  See Net::Server::Proto.

       Any sockets created during startup will be chown'ed to the user and group specified in the starup arguments.

PARAMETERS

       The following paramaters may be specified in addition to normal command line parameters for a Net::Server.  See Net::Server for more
       information on reading arguments.

       unix_type
	   Can be either SOCK_STREAM or SOCK_DGRAM (default is SOCK_STREAM).  This can also be passed on the port line (see Net::Server::Proto).

	   However, this method is deprecated.	If you want SOCK_STREAM - just use proto UNIX without any other arguments.  If you'd like
	   SOCK_DGRAM, use the new proto UNIXDGRAM.

METHODS

       NS_unix_path/NS_unix_type
	   In addition to the standard NS_ methods of Net::Server::Proto classes, the UNIX types also have legacy calls to NS_unix_path and
	   NS_unix_type.

	   Since version 2.000, NS_unix_path is simply an alias to NS_port.  NS_unix_type is now redundant with NS_proto.

	   These methods were missing between version 2.000 and 2.003 but have been returned as legacy bridges.

QUICK PARAMETER LIST

	 Key		   Value		    Default

	 # deprecated UNIX socket parameters
	 unix_type	   (SOCK_STREAM|SOCK_DGRAM) SOCK_STREAM
	 port		   "filename"		    undef

	 # more recent usage
	 port		   "filename / UNIX"
	 port		   "filename / UNIXDGRAM"

LICENCE

       Distributed under the same terms as Net::Server

perl v5.18.2							    2012-06-06					       Net::Server::Proto::UNIX(3)
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