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Top Forums Shell Programming and Scripting How to run simple single command on multiple Linux servers? Post 303006380 by darling on Wednesday 1st of November 2017 08:06:47 AM
Old 11-01-2017
How to run simple single command on multiple Linux servers?

Hi All,

How can i run a single command on multiple servers with or without giving credentials.

I have a file(servers.txt) which has got list of servers and i want to run a command
Code:
lsb_release -dr

on all these servers and get output of those servers against each server.

I tried below code but it didn't work

Code:
tmpdir=${TMPDIR:-/tmp}/pssh.$$
mkdir -p $tmpdir
count=0
while IFS= read -r userhost; do
    ssh -n -o BatchMode=yes ${userhost} 'lsb_release -dr' > ${tmpdir}/${userhost} 2>&1 &
    count=`expr $count + 1`
done < servers.txt
while [ $count -gt 0 ]; do
    wait $pids
    count=`expr $count - 1`
done
echo "Output is in $tmpdir"



output of $ lsb_release -dr
Code:
Description:    Red Hat Enterprise Linux Server release 6.4 (Santiago)
Release:        6.4

is there any single line command which can give me the output as below
Code:
gbahelkm72.trp.expre.rmr   Release:        6.4
rtsahelkm98.trp.expre.rmr   Release:        6.4

 

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ypinit(1M)						  System Administration Commands						ypinit(1M)

NAME
ypinit - set up NIS client SYNOPSIS
/usr/sbin/ypinit [-c] [-m] [-s master_server] DESCRIPTION
ypinit can be used to set up an NIS client system. You must be the superuser to run this command. This script need not be used at all if ypbind(1M) is started with the -broadcast option (it is invoked with this option from the svc:/network/nis/client:default service). Normally, ypinit is run only once after installing the system. It may be run whenever a new NIS server is added to the network or an exist- ing one is decommissioned. ypinit prompts for a list of NIS servers to bind the client to; this list should be ordered from the closest to the furthest server. It is recommended that you list each of these NIS servers by name and numeric IP address in /etc/hosts. Though the practice is not recommended, NIS allows you to list servers by numeric address only, bypassing /etc/hosts. In such a configuration, ypwhich(1) returns a numeric address instead of a name. ypinit stores the list of servers to which a client can bind in the file /var/yp/binding/domain/ypservers. This file is used by ypbind when run without the -broadcast option. OPTIONS
-c Set up a ypclient system. -m Build a master ypserver data base. -s master_server Slave data base. master_server must be the same master configured in the YP maps and returned by the ypwhich -m command. FILES
/etc/hosts File in which it is recommended that NIS servers be listed. /var/yp/binding/domain/ypservers Lists the servers to which the NIS client is allowed to bind. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
svcs(1), ypwhich(1), svcadm(1M), ypbind(1M), sysinfo(2), hosts(4), attributes(5), smf(5) NOTES
The NIS client service is managed by the service management facility, smf(5), under the service identifier: svc:/network/nis/client:default Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser- vice's status can be queried using the svcs(1) command. BUGS
ypinit sets up the list of NIS servers only for the current domain on the system when it is run, that is, the domain returned by the SI_SRPC_DOMAIN command to sysinfo(2). Care should be taken to ensure that this is the same as the desired domain for NIS client processes. SunOS 5.11 20 Dec 2007 ypinit(1M)
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