book

CentOS 6 Linux Server Cookbook

by Jonathan Hobson

April 2013

Beginner

374 pages

8h 14m

English

Packt Publishing

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What this book covers

ErrataPiracyQuestions
Introduction
Getting readyHow to do it...How it works…See also
Getting readyHow to do it...How it works…See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...
Introduction
Getting readyHow to do it...How it works...There's more...Linking time and location
Getting readyHow to do it...How it works...There's more...Synchronizing multiple machinesModifying the logfile's locationFudging timeSee also
Getting readyHow to do it...How it works...There's more...Substituting the Netmask value with a prefixFinding your HWADDR/MAC address
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...
Introduction
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Introduction
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...See also
Introduction
Getting readyHow to do it...How it works...There's more...Change the default timeout
Getting readyHow to do it...How it works...There's more...Changing the SSH port number of your serverLimiting SSH access by user or groupSee also
Getting readyHow to do it...How it works...There's more...Allowing an IP addressBanning an IP addressSee also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...Unblocking an IP addressSee also
Getting readyHow to do it...How it works...There's more...See also...
Introduction
Getting readyHow to do it...How it works...There's more...Disable printing support in SambaRelaxing the rules for SELinuxOpening the firewallAssigning the master browserSee also
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...Controlling access and enabling a write list for specific users or groupsEnabling guest-only access to a custom share folderSee also
Introduction
Getting readyHow to do it...How it works...There's more...Enabling access to a DNS server from behind a firewallCleaning expired recordsSee also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...See also
Introduction
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...Reviewing and revoking permissions or dropping a userSee also
Getting readyHow to do it...How it works...There's more...Connecting to PostgreSQLAccessing a PostgreSQL database using psqlCreating a copy of a database in PostgreSQLSee also
Getting readyHow to do it...How it works...See also
Introduction
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...There's more...Setting up e-mail softwareSee also
Getting readyHow to do it...How it works...There's more...Setting up e-mail software with SMTP authenticationSee also
Getting readyHow to do it...How it works...There's more...Setting up a catch-all e-mail address for a virtual domainSee also
Introduction
Getting readyHow to do it...How it works...There's more...Running a CGI/Perl scriptActivating ModPerl::PerlRunSee also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...Reinstating suexecSee also
Getting readyHow to do it...How it works...There's more...See also
Getting readyHow to do it...How it works...See also
Introduction
Getting readyHow to do it...How it works...There's more...Changing the default time-outBanning a user from the FTP serviceCustomizing the bannerSee also
Getting readyHow to do it...How it works...See also
Getting readyHow to do it...How it works...There's more...
Getting readyHow to do it...How it works...There's more...

Content preview from CentOS 6 Linux Server Cookbook

Synchronizing the system clock with NTP

In this recipe, we will learn how to synchronize the system clock with an external time server using NTP.

Time remains an essential tool for your server because every aspect of managing, securing, running, and debugging a network involves determining when events happen or are about to take place. From the need to time stamp documents, e-mails, logfiles, or by simply interacting with shared devices and services, everything on your server is dependent on maintaining an accurate system clock and it is the purpose of this recipe to show you how to achieve this with the Network Time Protocol (NTP).

Getting ready

To complete this recipe you will require a working installation of the CentOS 6 operating system with ...

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CentOS 7 Linux Server Cookbook - Second Edition

Publisher Resources

ISBN: 9781849519021Other

CentOS 6 Linux Server Cookbook

by Jonathan Hobson

Synchronizing the system clock with NTP

Getting ready

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

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CentOS 7 Linux Server Cookbook - Second Edition

CentOS 7 Server Deployment Cookbook

Mastering CentOS 7 Linux Server

Learn CentOS Linux Network Services

Publisher Resources

Synchronizing the system clock with NTP

Getting ready

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,and much more.

You might also like

CentOS 7 Linux Server Cookbook - Second Edition

CentOS 7 Server Deployment Cookbook

Mastering CentOS 7 Linux Server

Learn CentOS Linux Network Services

Publisher Resources

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.