What's the number of times the letter "r" appears in:
Q: automated change password on linux servers Dear friends and colleges 
Each half year we need to change the password on our redhat Linux servers , 
we have 8723 servers!!! In our company
Is it possible to automate password changing each half year without our involving ?
Regarding the password name – how to know it , so it very simple only one server from all our server will get this password , lets say in /var/pass/pass.txt
Is it wonderful innovation ?

A: Honestly, with 8723 servers you should already have some automation and configuration management and if you don't: this is a perfect use-case to start introducing it. Resetting local (root) passwords is fairly trivial to automate with tools Puppet, chef, Ansible, Red Hat Satellite etc.

Alternatives:


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*Replace local (management) accounts with centralised authentication in the form of LDAP, FreeIPA, radius or even AD. That results in only a single place where to enforce password policies and/or reset passwords for your admins and users. 

*Configure sudo with access rights based on group membership and nobody needs to know or use the actual root password(s) anymore, negating the need both set a valid/known root password or to ever change that password. 

*In the rare cases that you would need actual root access you can boot in single user mode or from a rescue image (or follow the RHEL7 root password recovery procedure ) 

*If you do need valid root paswords  look in to privileged password management software which  automates securely storing passwords and controlling access to them. Typically such a system will also periodically reset privileged account passwords and after an admin was granted access to a system such software will also reset the password again, to deny the admin future access 

user
In the text, there are 107 "r"s.
assistant