The redhat-upgrade-tool provides a way to upgrade Red Hat Enterprise Linux 6 systems to Red Hat Enterprise Linux 7. The redhat-upgrade-tool command is a program to collect the information for upgrade and prepare the environment. It includes downloading kernel, and initial ram image, and packages.
QEMU (short for Quick Emulator) is a free and open-source emulator that performs hardware virtualization. QEMU is a hosted virtual machine monitor: it emulates the machine’s processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it to run a variety of guest operating systems.
There is some challenges for passing Linux commands with parameters to guest OS. In most of cases, administrators have to pass commands as a PowerShell variable also I had some bad experiences, as an example: run “Sed” with some special parameters. I have to use lot of double quotes and single quotes to pass command via Invoke-VMScript to guest OS.
Powerful hardware, modern and new operating system are nothing when those components are not properly configured. Best practices which published by vendors, helping us to achieved good performance and reduce issues but best practices are general and may be not tested on specific hardware.
All VMware guys know that guest OS needs drivers for
paravirtualized devices and the drivers provided by VMware as a package which called VMware Tools. VMware Tools is available for supported operating systems and also there is an open-source which called Open-VM-Tools and it’s available for modern Linux distributions and installed by operating system installer.
Java programming language is most popular programming languages (Tiobe Index)but Java applications are monster and eating computing resources easily if codes are not optimized and application not profiled. Monitoring Java applications has overhead on a system and in most of scenarios, test environments are different than production environments.
Red Hat Satellite is a system management software for Red Hat Enterprise Linux that provided by Red Hat. Red Hat Satellite is an open source software but you have to pay for subscriptions, if you want access to that. Red Hat Satellite or any other system management software is necessary for medium and large companies to provision, manage and keep update physical and virtual servers.
What do you need for Small and Medium-Sized Enterprise businesses in IT department? Directory service, Mail service, Firewall. Anti-Spam, and many other services. You have to pay for each service if you want to have proprietary software such as Microsoft’s products. When we are talking about cost, open-source software will help you to reduce costs. Please consider that open-source software has cost for you but it will lower than closed-source software.