Tagged: centos

Server Management 3

YUM: Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast

Have you ever ecounter this error “Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast”?

If you are running a server that was not able ti connect to an active repository server for weeks, that error will prompt about an outdated repository entries. This can be solved by purging the “yum data”

Digital sign your email with DKIM 4

Digitally Sign Your Email with DKIM

Digitally sign your email with DKIM (DomainKeys Identified Mail) and help prevent email spoofing on your side. DKIM adds a private key which stays in your server and a public key that stays in your DNS record. The outgoing email header that you send gets encrypted and the recipient servers then retrieve the public key to decrypt the incoming headers and verify that the messages really comes from your domain and was not altered while it is on transit.

CentOS - Community Powered Operating System 0

Save Bandwidth Using Delta RPM

“What are Delta RPMs anyway?”. Linux OS providers have come up of a way to save bandwidth when installing or updating your Linux packages/programs. One of the answers are Delta RPMs. A Delta RPM basically collects the difference from the old RPM (packages on your computer) from the one available on the repository and only downloads the correct RPM stripped down to the exact changes.

Software Development 1

Always Update Your Virtual Server

Updating your Virtual Server is a must procedure to ensure that you’ll get the latest update and patches. Almost all of the security problems we encounter on our Virtual Server gets easily fixed by performing an application update.

In the video, I used Yum command’s “yum update” to instruct CentOS to download the latest updates.

Server Management 1

Installing CentOS 6 Minimal

We will start the video series with a small video showcasing about “Installing CentOS 6 Minimal” using noVNC over the internet’s cloud servers. For the tutorial, I used Vultr since it gives more power to the user by allowing you to install a Minimal version of your favorite OS via custom ISO. When starting a sever, a minimal OS installation is a big YES to avoid software conflicts.

Virtualmin is configured to setup DNS zones but this system is not setup to use itself as a DNS server 3

Virtualmin is configured to setup DNS zones but this system is not setup to use itself as a DNS server

Failed to save enabled features : Virtualmin is configured to setup DNS zones, but this system is not setup to use itself as a DNS server. Either add 127.0.0.1 to the list of DNS servers, or turn off the BIND feature on the module config page.

This is a generic error telling the website administrator that the local DNS entries are being checked using external methods. Most of the time, this wont be a real issues but it causes a performance spike which depends highly on where the DNS entries are being searched.

Setup a fully qualified domain name 1

How to Setup a Fully Qualified Domain Name on CentOS

In the computer and networking world, there is a nodename that is well used and yet at the same time called upon to be deprecated by some server admins. The nodename is called “hostname” which basically is a label assigned to the connected device in a computer network. This is widely used to identify the device from various forms of electronic communication such as the World Wide Web, e-mail or Usenet.

How to install virtualmin 0

How to Install Virtualmin on CentOS 7/ RHEL 7

Virtualmin is an advance, powerfull and flexible web hosting control panel for your Linux and UNIX system. It is the virtual host magement module of the well-known Open Source web-based server management system Webmin. With virtualmin, you can manage multiple virtual hosts, multiple virtual domains, mailboxes, database, applications and other stuff from its comprehensive and friendly web interface.

Virtualmin is a comprehensive and excellent replacement for your cPanel and Plesk control panels . Virtualmin offersr the same features that you can find from the two mentioned control panels such as account creation, domain management, dns management, MySQL management and much more. Virtualmin also offers a control panel for non-root users for management of their hosting account.

Basic initial steps in building a working webserver 4

Basic Initial Steps on Building a Server

Establish an SSH connection to your remote server using putty for Windows, Linux and Unix. I normally use Windows when setting up my *nix servers and I prefer kitty portable SSH client from 9bis. Kitty portable SSH client is a fork of Putty and a very good client.

For first time connections, a certificate will be presented to you which you can either accept and download or deny which will cause a termination of the current SSH session. In order to continue, you should “accept”, this prompt will also reappear if your server have done a massive change on it’s private certificate.

Install Webmin and Virtual Min on your machine 0

How to Install Webmin – RPM Method

Webmin is an alternative hosting free control panel which function like CPanel. Webmin provides easy to use interface for managing your Unix/Linux system and provides a nice option to setup user accounts, Apache, DNS, file sharing and much more.