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How To Upgrade/Migrate Ejabberd XMPP Server On Linux

Migrate Or Upgrade Ejabberd XMPP Server In Linux

In this example we will be upgrading from an older instance of the ejabberd-15.04 XMPP server to the current latest version ejabberd-16.06. Operating system specific packages such as RPM and DEB files were not provided until ejabberd-15.06, so our existing instance was not installed with the RPM file but instead from the binary file, meaning there is no existing ejabberd RPM installed for us to simply upgrade.

While this upgrade is taking place on the same server, these steps can also be used to perform a migration from one server to another with a fresh installation of ejabberd, as the new version will install to a new directory.

How To Migrate Tenable SecurityCenter

Posted by Jarrod Farncomb on August 3, 2016 2 comments

Here we’re going to cover how to migrate an existing running instance of Tenable SecurityCenter from one Linux server to another.

I was not able to find great documentation around this process, and after contacting Tenable support for instructions I found that the steps provided were very basic and did not actually include everything needed, so I have documented everything that I needed to do here.

Linux How To: Delete A User Account

Posted by Jarrod Farncomb on July 27, 2016 No comments

In Linux we can delete local user accounts with the ‘userdel’ command. Here we will cover some examples of using the various syntax options with userdel in order to remove a local user account in Linux.

Linux How To: Copy a File or Directory

Posted by Jarrod Farncomb on July 20, 2016 No comments

In Linux we can copy files and directories around with the ‘cp’ command. Here we will demonstrate some common examples in which ‘cp’ can be used.

Linux How To: Join Two Files – Append One File To Another

Posted by Jarrod Farncomb on July 13, 2016 No comments

With the Bash shell in Linux it is quite simple to append the contents of one file to another, here we will cover how to perform file concatenation.

Linux How To: Add User To Group

Posted by Jarrod Farncomb on July 6, 2016 No comments

In Linux we can modify a local user account with the ‘usermod’ command. Here we will cover some examples of using the various syntax options with usermod in order to modify existing user accounts in Linux, specifically to add them into a group.

Linux How To: Add A User Account

Posted by Jarrod Farncomb on June 29, 2016 1 comment

In Linux we can create a new user account with the ‘useradd’ command. Here we will cover some examples of using the various syntax options with useradd in order to create a new local user account in Linux.

How To Use Kerberos to Control Access to NFS Network Shares

Posted by Jarrod Farncomb on June 22, 2016 7 comments

By default NFS is not very secure, there’s no real authentication and access is granted based on hostname or IP address, information is sent over the network in plain text, and it’s also fairly easy to fake your UID/GID.

By making use of Kerberos we can secure NFS as this provides authentication, encryption and integrity.

How To Configure Linux To Authenticate Using Kerberos

Posted by Jarrod Farncomb on June 15, 2016 26 comments

Configure Linux for Kerberos authentication

Kerberos is an authentication protocol that can provide secure network login or SSO for various services over a non-secure network. Kerberos works with the concept of tickets which are encrypted and can help reduce the amount of times passwords need to be sent over the network.

These tickets are issued throughout the Kerberos realm by a centralised key distribution center (KDC). Here we will cover how to setup a KDC and obtain a Kerberos ticket from a client system in CentOS Linux.

Produce And Deliver System Utilization Reports (processor, memory, disk, and network)

Posted by Jarrod Farncomb on June 8, 2016 1 comment

Produce and deliver system utilization reports - RHCE Linux

The sysstat package in Linux automatically logs various system resource information, including processor, memory, disk and network.

We can process these logs with the ‘sadf’ command in order to generate basic reports which outline system resource usage over a defined period of time.

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