By Andrew Mallett
CentOS is commonly revered as the most important and versatile Linux distribution, and it may be used as an internet server, dossier server, FTP server, area server, or a multirole resolution. it truly is designed to address the extra challenging wishes of commercial functions reminiscent of community and approach management, database administration, and net prone. CentOS is self-sufficient and speedy whereas operating, with the additional advantage of worldwide attractiveness as a number of the world's internet servers run on it.
This e-book not just concentrates at the fundamentals, but in addition vitamins your latest wisdom on topic components which are vital within the firm industry, reminiscent of listing prone, safeguard configuration administration, and web-based structure. via the tip of this publication, it is possible for you to to regulate an firm Linux community fascinated by management-centralized configuration, person administration, and filesystem improvements via masking every little thing from the most recent filesystem advances with BTRFS via to studying in regards to the new internet server at the block—Nginx.
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A useful advisor to fitting, configuring, and administering the CentOS community-based company server.
• providing entire perception into CentOS server with a chain of beginning issues that assist you construct, configure, continue and installation the most recent variation of 1 of the world's most well-liked neighborhood dependent firm servers.
• delivering newcomers and more matured members alike with the chance to reinforce their wisdom by way of providing fast entry to a library of recipes that addresses all features of CentOS server and placed you in control.
• providing you with instant entry to a thriving wisdom base that illustrates simply how fast you could grasp CentOS server with a complete host of methods of the alternate thrown in for sturdy measure.
CentOS is a community-based firm category working procedure and this e-book will offer a chain of functional options that may not simply enable you to set up and continue CentOS as a server, yet to discover this recognized Linux distribution with the purpose of tackling many universal matters by way of delivering a few methods of the exchange which will simplify the duty of creating a server.
CentOS 6 Linux Server Cookbook is a pragmatic consultant to deploy, configuration, management, and upkeep. this can be a one-stop-shop to all issues CentOS, so regardless as to if you wish a mail server, internet server, database server, area server or a dossier sharing platform, this publication presents a complete sequence of beginning issues that would offer you direct entry to the interior workings of this open resource, community-based company server.
CentOS 6 Linux Server Cookbook is a realistic consultant to the whole deploy, configuration, management, and upkeep of 1 of the world’s preferred community-based company servers.
From install to configuration, this publication of recipes will take you on a trip to discover internal workings of CentOS server. inside of this ebook you are going to tips on how to set up CentOS in number of settings, increase your install with the proper instruments of the alternate and get ready your server to fulfil nearly any function you'll ever need.
By gaining knowledge of extra approximately time, networking, package deal administration, procedure administration and safeguard, this publication will serve to teach you the way to get some of the best from this freely to be had, open resource server through featuring a sequence of recommendations that may allow you to grasp the artwork of creating your own internet, database, mail, area identify, dossier sharing services.
What you'll examine from this book
• fitting and validating CentOS 6 and including a laptop environment;
• Configuring CentOS to permit you to control time and a number of IP addresses;
• handling log documents by utilizing logrotate, reminiscence utilization and databases;
• handling programs will provide help to deal with the procedure with the Yum package deal manager;
• Administering CentOS via developing new administrative clients and growing personalized e mail reports;
• Securing your shell setting, ascending person privileges and development firewalls to avoid outdoors attacks;
• construction networks, domain names and enforcing the Apache internet server.
Presented in a step-by-step, effortless to learn educational sort, this e-book provides the reader with genuine global recommendations to each point of CentOS 6.
CentOS is greatly revered as the most important and versatile Linux distribution, and it may be used as an internet server, dossier server, FTP server, area server, or a multirole resolution. it's designed to deal with the extra challenging wishes of industrial functions reminiscent of community and procedure management, database administration, and net companies.
You may reflect on constructing LAMP as 4 books in a single, yet it is really whatever even more important: a unmarried quantity that offers the open-source applied sciences identified jointly as LAMP- Linux, Apache, MySQL, and PHP-as tightly dovetailed elements of state-of-the-art such a lot cheap and powerful platform for construction dynamic web-based functions.
Procedure directors are speedily adopting Ubuntu as a result of their skill to configure, install, and deal with community providers extra successfully than ever. This e-book publications you thru all the key configuration and management initiatives you’ll want to know to speedy installation and deal with the Ubuntu Server distribution.
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Additional info for CentOS System Administration Essentials
I think it is time that we investigate this a little further. When a new directory is created, it is initiated with the link count being equal to two; in other words, each new directory has to have two names that point to it. This will consist of the directory name and the file named . (just the period by itself). In fact, in a new directory, there are always two new files that are created along with the directory: the . and .. files. • The . file represents the directory itself • The .. file represents the parent directory [ 34 ] Chapter 3 Try this yourself; it is easier to understand and might prevent you from going too dotty over this: $ cd $ mkdir newdir $ ls -a newdir #Note the two files $ ls -ld newdir # Note the hard link count of 2 The following screenshot shows the new directory and the listing of the two hidden files therein.
Expanding a BTRFS filesystem We may well be running out of space within the /data structure; we are not but we can imagine. If we were using an LVM structure, we would have to run several commands to expand the existing filesystem across a new partition or disk. This would be the process in LVMs: Volume management in the old way requires us to execute the following commands: # pvcreate /dev/sdb6 # vgextend vg1 /dev/sdb6 # lvextend -L+1000M /dev/vg1/data_lv # resize2fs /dev/vg1/data Volume management with BTRFS As we can see, there are four commands to be executed, all with a generous sprinkling of syntax that will try to trip us up.
Using the ls command with the option for the long listing, -l, will display the hard link count. The option, -i, will display the inode number of the file. The inode number of both files will be the same. As hard links share the same inode number, the source and target file must be on the same filesystem. An inode is an entry within a single filesystem. Symbolic links Symbolic links, or soft links as they are sometimes referred to, are completely separate files whose data points to another filename; as such, they can cross the filesystem boundaries and be a little more useful than hard links.