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Operating Systems Solaris best configuration for syslog.conf Post 302713421 by DGPickett on Wednesday 10th of October 2012 04:01:00 PM
Old 10-10-2012
Often, nothing less than some sort of "end to end test of each server", running on a dedicated testing host, will assure you that they are all alive. This is one reason I dislike "warm spare" architecture, where a host sits unused until a failover. It might be dead or the failover may be a failure. I am for divided load and application specific server testing. With the right architecture, the load can shift pretty instantly to the remaining server(s) when one dies, give or take any services in process there.

Like I said in one memorable customer meeting on reliability, "Sometimes the system is not down but just running very slowly." They asked "How can you tell if it is too slow>" I said, many times in the next hour, "A loud banging on the computer room door!" Testing should test not only function but latency/response-time. Good monitoring shows you when things are running slow and backing up, so you do not accidentally kill a live server trying to service it. There are many ways to make a server temporarily slow, like paging every page out. Even without thrashing, one good sweep can make for a million page faults as other apps reestablish themselves in RAM.
 

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ypset(1M)						  System Administration Commands						 ypset(1M)

NAME
ypset - point ypbind at a particular server SYNOPSIS
/usr/sbin/ypset [-d ypdomain] [-h host] server DESCRIPTION
In order to run ypset, ypbind must be initiated with the -ypset or -ypsetme options. See ypbind(1M). ypset tells ypbind to get NIS services for the specified ypdomain from the ypserv process running on server. If server is down, or is not running ypserv, this might not be dis- covered until an NIS client process tries to obtain a binding for the domain. At this point, the binding set by ypset is tested by ypbind. If the binding is invalid, ypbind attempts to rebind for the same domain. ypset is useful for binding a client node that is not on a broadcast net, or is on a broadcast net that is not running an NIS server host. It is also useful for debugging NIS client applications, for instance, where an NIS map exists only at a single NIS server host. Where several hosts on the local net are supplying NIS services, ypbind can rebind to another host, even while you attempt to find out if the ypset operation succeeded. For example, if you enter the ypset command below, you might get the subsequent response from ypwhich: example% ypset host1 example% ypwhich host2 The sequence shown above is a function of the NIS subsystem's attempt to load-balance among the available NIS servers, and occurs when host1 does not respond to ypbind because it is not running ypserv (or is overloaded), and host2, running ypserv, obtains the binding. server indicates which NIS server to bind to, and must be specified as a name or an IP address. This works only if the node has a current valid binding for the domain in question and ypbind has been set to allow use of ypset. In most cases, server should be specified as an IP address. ypset tries to bind over a connectionless transport. The NIS library call, yp_all(), uses connection-oriented transport and derives the NIS server's address based on the connectionless address supplied by ypset. Refer to ypfiles(4) for an overview of the NIS name service. OPTIONS
-d ypdomain Use ypdomain, instead of the default domain. -h host Set ypbind's binding on host, instead of locally. Specify host as a name. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
ypwhich(1), ypfiles(4), attributes(5) SunOS 5.10 14 Sep 1992 ypset(1M)
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