Debian 9 Stretch was released as the latest stable version of the Linux Debian operating system today. While you can install Debian 9 Stretch fresh, you can also perform an in place upgrade from Debian 8 Jessie quite easily, which is what we will cover here.
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Normally resetting the root password is a simple task if you’re logged in already with root privileges, however if you forget the password and need to change it things become a little more difficult.
The process has changed from CentOS/RHEL (Red Hat Enterprise Linux) version 6 to 7, as previously you would boot into single user mode and then change the password as root. From version 7 the equivalent modes are the rescue or emergency targets, however these require the root password before you can do anything which doesn’t help us here, so we’ll take you through the new process to change the lost root password.
This is also a task that you will need to know how to perform for the RHCSA exam.
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.
By default the size of a /boot partition in Linux is not that big, 512mb or so is quite a typical default. This space is used to store different versions of the Linux kernel that you have concurrently installed at the same time.
If this space fills up you may not be able to perform a kernel upgrade in future so it is important to not let it fill and free up space in /boot.
The XFS file system generally does a pretty good job at keeping itself clean and tidy, however it can still get fragmented over time. Here we’re going to show you how to check the level of fragmentation in place on your XFS file system and how you can defragment it if required, further increasing disk performance.
A few weeks ago I accidentally attempted to apply a XenServer hotfix intended for XenServer 6.2 to a host running XenServer 6.5. Ever since this accidental mistake, XenCenter has been reporting that there is a new update to apply, which should not be the case. At first I thought it would go away after the next reboot or after the next hotfix had been applied and fix itself up, however this did not happen, here is how to fix it.
A Citrix XenServer dom0 currently runs with a 4GB root partition which is pretty small by today’s standards. A small amount of usable storage space can be quite easy to quickly fill. It is therefore important that dom0 has free space in order for it to operate correctly. Here we will cover some different methods that can be used to free up disk space within XenServer.
Debian 8 Jessie was released as the latest stable version of the Linux Debian operating system today. While you can install Debian 8 Jessie fresh, you can also upgrade from Debian 7 Wheezy quite easily, which is what we will cover here.