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System Administration

Installing VMWare Zimbra Collaboration Server 7.2.0 - Community or Network Edition on CentOS 6.3 and Redhat Enterprise Linux 6.3

This tutorial will lead you to install VMWare Zimbra Network Edition 7.2.2. The tutorial can also be used for installing Zimbra Open source Community Edition. demo purposes I will be installing VMWare Zimbra Network Edition and Bind on the same machine but it is highly recommended that you choose separate machines for both roles in production. Depend on the situation it can also be installed with an already configured LDAP Server. VMWare Zimbra installation guide also recommends to disable SELinux before installing.

 

"Device eth0 does not seem to be present" after moving or cloning a RHEL/CentOS 6.3 Virtual Machine in VSphere

You may see this error message after cloning or moving a machine in VSphere. It could happen when you are not using distributed switch or you are moving one Virtual Machine to another host where this machine is unable to find the same network label. When you power on CentOS/RHEL 6.4 linux machine it encounters the error "Device eth0 does not seem to be present".

 

Installing ALFRESCO Community 4.0 on CentOS 6.2 and Redhat Enterprise Linux 6 using MySQL

 

Alfresco is an enterprise content platform that you can use in the cloud or behind your firewall. It helps you store and share the

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documents that every business depends on. Alfresco is built for the portability of the tablet and the power of the cloud. Today’s companies are more mobile and more collaborative than ever. Now you can work anywhere, with anyone, on any device—all connected by the cloud. In other words, Alfresco makes sure you have your content wherever you are. http://www.alfresco.com/

 

 

PERL Script to SSH Multiple Server Nodes, Checks of SSL Certificates Expiry and Email to Root

Question:

A set of nodes are managed using ssh only (call them "deva", "devb", "devc", "devd"). Each node runs a service that supports certificates, and the certificate expiration date must be checked. Each node can have multiple certificates, and they are all returned by running the shell command "get x509 cert" on the node itself. The command outputs one cert per line, with the following format:

 

CentOS 6.2 Installing LDAP Directory Services using CLI

Install openldap servers and clients:

 

yum install openldap-servers openldap-clients

 

 
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