High reliability web server - cluster, redundancy, etc Post: 302301982

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Special Forums UNIX and Linux Applications High Performance Computing High reliability web server - cluster, redundancy, etc Post 302301982 by bsaadmin on Sunday 29th of March 2009 04:29:48 PM

03-29-2009

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High reliability web server - cluster, redundancy, etc

Hi. I am IT manager/developer for a small organization. I have been doing as-needed linux server administration for several years and am by no means an expert. I've built several of my own servers, and our org is currently using hosting services for our servers and I am relatively happy.

We recently had an outage at the host, and management has made clear that this is unacceptable. Our host is one of the larger ones, a publicly traded company, and their techs are onsite and knowledgeable. The outage was a problem with the pipe between the hosting company and the backbone to the internet, caused by the hosting company's pipe provider. It lasted about 25 minutes. Just FYI.

So the conversation about redundancy and clusters has begun. I have never done this before. My hosting company offers a cluster plan that would be easy to implement (CPanel based) but that won't solve the problem of a pipe outage. We are thinking of clustered web servers (apache, php) and clustered databases (mysql) in different locations geographically. Wha are the considerations involved? Rough idea of costs, risks that remain, etc.

Any direction would be really appreciated.

bsaadmin

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LEARN ABOUT OSF1

ypxfrd

ypxfrd(8)						      System Manager's Manual							 ypxfrd(8)

NAME

       ypxfrd - High speed NIS map transfer daemon

SYNOPSIS

       /usr/sbin/ypxfrd

DESCRIPTION

       The  ypxfrd daemon is the transfer agent that handles map transfer requests from yppush on the master server and ypxfr on slave servers and
       clients.  This program performs the actual transfer of the NIS maps to slave servers and clients.  Typically, the maps are  transferred	to
       all  slave servers and clients unless the transfer is restricted to those subnets or hosts by an entry or entries in the /etc/yp/securenets
       file.  See ypserv(8) for information on this file.

       The ypxfrd daemon is activated at system startup time by an entry in the /sbin/init.d/nis file of an NIS master server machine. If the  log
       file  /var/cluster/members/{memb}/yp/ypxfrd.log	exists,  ypxfrd  appends all its output to that file. You can use the log file to retain a
       record of what was attempted, and the results.

       See ypfiles(4) and ypserv(8) for an overview of NIS.

RESTRICTIONS

       The ypxfrd daemon transfers NIS maps stored as ndbm files only. It does not transfer maps stored as btree or hash files.

FILES

       The ypxrfd log file. Each cluster member has its own copy.

SEE ALSO

       Commands: yppush(8), ypserv(8), ypxfr(8)

       Files: ypfiles(4)

																	 ypxfrd(8)