This guide will help you in setting up a DNS server for resolving IP address to domain names and vice-versa. We will be using "named (bind)" as its the DNS version for Linux. First we need to install named Packages.
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This article shows you how to install and configure a simple mail server called Postfix. It can be used to send emails or act as a email relay server for internal network wherein only one Server is allowed access to Internet and then all clients hosts will redirect email to this Postfix email relay server.
We would need to install two packages via YUM.
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Its best to secure /etc/fstab as it contains all the mount locations and can lead to boot issues if any novice person tinkers/plays around with it. The secure mode can only be enabled /disabled by root user only and completely secure. There is a simple one line command for that as given.
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Its possible add a LVM volume on the fly. The steps would involve formatting the newly added disk with LVM and creating a mount point and adding the new volume to it. The whole process would involve creating Physical Volume followed by Volume group and then assigning logical volume and mounting it to a mount point.
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In Linux when you try to SSH it may at times give you this warning that REMOTE HOST IDENTIFICATION HAS CHANGED. It usually happens when the hostname or IP has changed of a host or the host was rebooted and generated a new fingerprint Key ID. No need to worry, it can be removed by a single command and you would be up and running in no time.
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