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Full Discussion: Network related issues
Homework and Emergencies Emergency UNIX and Linux Support Network related issues Post 303002970 by otheus on Wednesday 6th of September 2017 05:43:07 AM
Old 09-06-2017
Most *NIX systems (AIX, Linux, Solaris, BSD) have some kind of system and accounting records. You can run
Code:
sar

to see if it is properly deployed on your system. If you run it and get loads of output, you may be in luck. To use it, refer to the man pages. Typically you want to check options for memory and swap usage, CPU usage, and I/O activity.

If it's not installed, consider deploying this first before installing some complex monitoring software; it's a very standard unix utility that has been around for ages, but the implementation and features vary from platform to platform. For Linux install the sysstat package.

On most systems, sar's data is collected through another program which is run as a cronjob. On a typical RedHat/CentOS Linux system, you will find /etc/cron.d/sysstat to contain:

Code:
* * * * * root /usr/lib64/sa/sa1 -S XALL 1 1

which I immediately change to

Code:
*/5 * * * * root /usr/lib64/sa/sa1 -L -S XALL 10 30

The original form collects data once per minute, which is often simply not enough granularity to get a feel for rapid changes to the system, the kind that cause instability and crashes. Also, if memory becomes extremely sparse, cron might not be able to spawn the job every minute.

My form, however, spawns a new job every 5 minutes. It writes 30 records, one every 10 seconds. The corresponding reports contain enough detail to know very precisely when the problem started. You will need an additional 1.5 GB of disk space on /var/log if you do this.

If you want graphs and pretty output, you may be able to export the data into graphing engines or spreadsheets. Linux's sar has such a program (sadf), and other related projects can slurp of the data and present graphs.
 

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ypinit(1M)																ypinit(1M)

NAME
ypinit - build and install Network Information Service databases SYNOPSIS
NIS_domain] NIS_server_name NIS_domain] Remarks The Network Information Service (NIS) was formerly known as Yellow Pages (YP). Although the name has changed, the functionality of the service remains the same. DESCRIPTION
is a shell script that creates Network Information Service (NIS) databases on either a master or slave NIS server. asks a few self- explanatory questions, and reports success or failure to the terminal. For an overview of Network Information Service, see ypfiles(4) and ypserv(1M). Options recognizes the following options and command-line arguments: Create the local host as the master server to all maps (databases) provided in the NIS domain (see domainname(1)). All maps are built from scratch, either from information pro- vided to at run-time, or from ASCII files in All such files should be complete and unabbreviated, unlike how they may exist on a NIS client machine (see passwd(4) for examples of abbreviated files). See ypmake(1M) for more information on how NIS databases are built on the master server. Note that uses the option when invoking so newly formed maps are not immediately copied to slave servers (see ypmake(1M)). Create NIS databases on a slave server by copying the databases from an existing NIS server that serves the NIS domain. The NIS_server_name argument should be the host name of either the master server for all the maps or a server on which the maps are current and stable. Configures the local host as a NIS client, so that the NIS client will attempt to bind to a particular NIS server. Invocation of with a option prompts the user to construct a list of NIS servers, in the order of preference, to which the client will try to bind. Each of these NIS servers must be listed in the file along with its IP Address. This list of NIS servers is stored in the file This file is used by when invoked without the option. (See ypbind(1M) in ypserv(1M)). If it is so desired that it is not necessary for a NIS client to bind to a NIS server in a particular list, the installation mechanism could be ignored. Causes to construct maps for the specified NIS_domain. defaults to the NIS domain shown by the command (see domain- name(1). RETURN VALUE
returns exit code 0 if no errors occur; otherwise, it returns exit code 1. AUTHOR
was developed by Sun Microsystems, Inc. FILES
SEE ALSO
domainname(1), makedbm(1M), ypmake(1M), yppush(1M), ypserv(1M), ypxfr(1M), ypxfrd(1M), group(4), hosts(4), netgroup(4), networks(4), passwd(4), protocols(4), publickey(4), rpc(4), services(4), ypfiles(4). ypinit(1M)
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