In the first SYNOPSIS line, the nisping command sends a ``ping'' to all replicas of a NIS+ directory. Once a replica receives a ping, it will check with the master server for the directory to get updates. Prior to pinging the replicas, this command attempts to determine the last update "seen" by a replica and the last update logged by the master. If these two timestamps are the same, the ping is not sent. The -f (force) option will override this feature.
Under normal circumstances, NIS+ replica servers get the new information from the master NIS+ server within a short time. Therefore, there should not be any need to use nisping.
In the second SYNOPSIS line, the nisping -C command sends a checkpoint request to the servers. If no directory is specified, the home domain, as returned by nisdefaults.1 is checkpointed. If all directories, served by a given server, have to be checkpointed, then use the -a option.
On receiving a checkpoint request, the servers would commit all the updates for the given directory from the table log files to the database files. This command, if sent to the master server, will also send updates to the replicas if they are out of date. This option is needed because the database log files for NIS+ are not automatically checkpointed. nisping should be used at frequent intervals (such as once a day) to checkpoint the NIS+ database log files. This command can be added to the crontab.1 file. If the database log files are not checkpointed, their sizes will continue to grow.
If used without -u option, -r will send a ping request to the servers serving the root domain. When the replicas receive a ping, they will update their root object if needed.
The -r option can be used with all other options except
with the -C option; the root object need not be checkpointed.
This example pings all replicas of the default domain:
Note that this example will not ping the the org_dir and group_dir subdirectories within this domain.
This example pings the server example which is a replica of the org_dir.foo.com. directory:
example% nisping -H example org_dir.foo.com.
This example checkpoints all servers of the org_dir.bar.com. directory.
example% nisping -C org_dir.bar.com.
If the server specified by the -H option does not serve the directory, then no ping is sent.
Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97