Download Learn CentOS Linux Network Services by Antonio Vazquez PDF

By Antonio Vazquez

This booklet teaches you to establish the most recent CentOS Linux community prone together with DNS, DHCP, SSH and VNC, internet, FTP, Mail, Firewall, and LDAP, permitting you to supply those providers by yourself community. CentOS remains to be a well-liked Linux distribution selection, and developing your personal companies is a key ability for someone preserving a CentOS community. you'll the best way to set up CentOS, and deal with uncomplicated management. You’ll then circulation onto realizing networking, and the way to establish your desired companies. every one bankruptcy is written in an easy-to-digest structure and teaches you ways organize, deal with, and troubleshoot each one provider. You’ll be operating your individual community very quickly in any respect.

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So it could happen, and it usually does, that, to work, a software depends on a certain library, which, in turn, depends on another component, and so on. el6. noarch This has been called “dependency hell,” and it’s been a nightmare for every Linux administrator over the years. To solve this problem, yum was created. yum tries to check and solve automatically the dependencies every package has, so that software installation runs smoothly. 1. Configuring yum in CentOS 6 yum can be configured to search for software packages in different repositories.

When we typed “cat /etc/passwd | grep root,” what we were actually doing was passing the output data of the cat command as an input parameter for the grep program. We could also redirect the output to a file. txt. Then, we would only have to open the file with whatever tool we wanted. db alternatives anacrontab . . 4. Installing Software One of the main tasks an administrator has to deal with is installing new software. This is done mainly in CentOS with the rpm and yum utilities. This is valid for CentOS 6 as well as for CentOS 7.

I686 . . If we want to check that the package named gedit is installed, we can do so by combining the former command and grep. i686 And, finally, if we want to erase the new installed package, it is also very easy to do. 1 2 3 [root@delphos ~]# rpm -e gedit [root@delphos ~]# rpm -qa | grep -i gedit [root@delphos ~]# Every rpm file also states the rpms it depends on, that is, the rpms that have to be installed before, so that the one we are installing at the moment will work. So it could happen, and it usually does, that, to work, a software depends on a certain library, which, in turn, depends on another component, and so on.

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