Essential iptables on RHEL
I good getting starting guide and also very well explained is casting by Red Hat.'Hardening access to network services with iptableshttp://www.redhat.com/resourcelibrary/articles/training-webinars
View ArticleWhy You Should Implement equals() and hashCode() In Hibernate
It is not directly obvious why you should override and implement equals() and hashCode() in Hibernate. Here are two good documentation for why:- Hibernate ORM...
View ArticleClik here to view.
Use Tree View in RHEL File Browser (Nautilus)
The default file browser mode in Nautilus is with icon, but that view requires quite a lot of clicks to navigate your files. A better view is the tree view. To change to the tree view, is not that...
View ArticleHow To Make a Bootable USB to Partition HDD
A great tool for partitioning a hard disk is gparted. You find a longer description here http://gparted.org/liveusb.php#linux-method-b. In brief the steps are the following Download...
View ArticleConfigure Stateful Firewall
iptables Configuration FilesContains persisted kernel filtering rules.Contains configuration for iptables.List iptables filtering rulesiptables -vnL --line-numbersoptions:v - verbose, if not used you...
View ArticlePrecaution When Working With Remote Firewall (iptables)
Configure a remote machine's firewall, can be hazardous. So here is one way of making it a little more safer.First backup current firewall rules.Secondly create a script with all you firewall rules,...
View ArticleScanning network for open ports with nmap command
Whenever you are configuring a firewall, you want to make sure afterwards that the firewall really is configured properly and to do that is to scan it. Below follows two great links that helped...
View ArticleConfigure iptables for FTP Server, vsftp
Server InstallationNow the ftp server is ready to be used. Lets create a simple text file in the root of the ftp server.Configure iptablesExisting iptables rules.First we will add a LOG operation just...
View ArticleClik here to view.
Virtualization with KVM on RHEL 6
Install KVMVerify InstallationCheck that kvm kernel modules are loaded. There should be two: kvm and either kvm_intel or kvm_amd.If kvm_intel or kvm_amd is not loaded, try to load it. E.g. kvm_intel.In...
View ArticleInstall Nagios Core 3.5 on RHEL 6 from EPEL Repository
IntroductionThe Nagios is one of the most poplur product for monitoring IT Infrastructure, such as servers, network and services.The system overview of the Nagios modules:Nagios Core - The Server with...
View ArticleClik here to view.
Install Nagios Agent NRPE on RHEL 6 from EPEL Repository
IntroductionThe Nagios Plugins are the components that do the actual monitoring work. They are all bash scripts and are located in:To make the plugins/agents talk with server/Nagios Core you use the...
View ArticleThe NTP Daemon on RHEL 6
InstallationCheck that NTP services is started at boot.If not automatically started.If NTP service is not running, start it.ConfigurationDefault configuration is almost always sufficient.TestCheck...
View ArticleConfigure Nagios Monitoring
PrerequisiteBefore you begin verify you server and client configuration. From the server test client connection.To setup server, see...
View ArticleInstall Flashplayer on RHEL 6
DownloadDownload the plug-in for Linux 64-bit (tar.gz) from http://get.adobe.com/flashplayer/.InstallMove the tar file to /tmp and extract it.Before proceeding close you web browser. Then move the...
View ArticleClik here to view.
Configure OpenJDK Source Code From Eclipse on RHEL 6
IntroductionIn most Linux distribution is the source code for OpenJDK already available via RPM or Debian Package, but not for RHEL 6. The reason is probably the RHEL 6 main aim is for server OS and...
View ArticleClik here to view.
Automatic RHEL 6 Installation with Kickstart
IntroductionToday the requirement are higher to quicker responds to the market. For a computer operation that means, they must be quicker to bring up new machine. The Red Hat solution for this is to...
View ArticleInstalling RHEL 6 Default Directory Servers, OpenLDAP
IntroductionIn this blog I will show you how to install, configure and test the default directory service in RHEL 6 - OpenLDAP. LDAP directory services are common used for storing authentication...
View ArticleHow to Disable System Beep in Fedora 20
The default setup of Fedora 20 have a quite annoying feature and that is the system beep. The beep sounds when using auto completion in terminal window, but also in firefox when searching in page and...
View ArticleBlogspot Blogger set Dynamic Width
It is quite silly with fix width layout for HTML pages, which indirectly means a web page will only use a small part of modern laptop or monitors screen. Why not make it dynamic? Let people self decide...
View ArticleClik here to view.
Using OpenLDAP as Authentication Directory Service in RHEL 6
Installing OpenLDAPConfigure OpenLDAPModify domain (olcSuffix) and the LDAP super username (olcRootDN).Set password for the LDAP super user. To create password use slappasswd.And add password to...
View Article