How can update Kernel in OpenVZ VPS ?

Serversupportz1

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Trying to update kernel to the latest version in CentOS 7, but the kernel, not updating. Can anyone suggest how to update?
 

isix

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Trying to update kernel to the latest version in CentOS 7, but the kernel, not updating. Can anyone suggest how to update?
It's easy:

*howtoforge.com/tutorial/how-to-upgrade-kernel-in-centos-7-server/
*phoenixnap.com/kb/how-to-upgrade-kernel-centos
*tecmint.com/install-upgrade-kernel-version-in-centos-7/
 

Kaz Wolfe

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What is the different between kernel and yum update or os update?
 

tuxandrew

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tuxandrew
All these are basically means to update either the software versions or its related packages etc.

- Kernel update means to download the latest kernel version and bootup the server in new kernel.

- Yum update means to up to date the new Operating System packages from the yum repository.

- Os update also meant the same as to update the new operating system packages from repository.
 

WSCallum

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You're on a OpenVZ VPS so you can't update the kernel which is one of the downfalls of container VPS such as OpenVZ, LXC etc - The kernel is managed by the hosting provider and its up to them to update it. You also can't run a custom kernel.

If you want management over your own kernel or want to run a custom kernel you need to look at a full virtualization VPS that uses either KVM or Xen for example.
 

tuxandrew

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Yes true, Since the OPenVZ offers only Operating System layer based virtualization, but XEN,KVM provides kernel based virtualization which is more secured.
 

isix

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isix
Yes true, Since the OPenVZ offers only Operating System layer based virtualization, but XEN,KVM provides kernel based virtualization which is more secured.
...in which way is it more secure? If the OS or kernel is "vulnerable", then in both cases (OpenVZ, Xen or what's ever) the provider has to take "action" to fix it.
 

tuxandrew

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tuxandrew
As mentioned, the basic terminology defines the difference. OpenVZ is not true virtualization but really a containerization, which offers hosting of multiple OS on the same hardware which is really isolated in OS level only and is sharing the server resources as well.

The disadvantage with this approach is the single patched kernel. All guests must function with the same kernel version that the host uses.
The chances are high that, any vulnerabilities affecting the host kernel which will affect all the other containers in the host node.

Also there are situations arises when a root hack is happened within a single VPS because of any kernel or operating system vulnerabilities, then it can easily comprise other operating systems as well on the same host node.

For these reasons other technologies offering more security on the kernel based architecture than openVZ as they are not constrained to the kernel of the host node.

Hope that clarifies the question.
 

isix

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Best answer
What-is-the-Difference-Between-OpenVZ-and-KVM.jpg

So - the only difference between OpenVZ and e.g. KVM is:
1. OpenVZ allows only OS-level virtualization and does not allow its users to modify the kernels.
2. KVM provides kernel-level virtualization with each virtual level having its own RAM, kernel, a network card, graphics adapter etc.

But regarding "kernel" and OS SECURITY are both vulnerable and no one is "more" secure then the another.
 

tuxandrew

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If you are pin pointing to the feature of each technologies one by one in all the technical aspects, yes there are lot more which some one who need to glance before they are going to adapt any one of these technologies for their business purpose.

KVM and OpenVZ are mature technologies, user space applications in Linux like LAMP stack webhosting or intend to have better performance with limited disk and memory foot print then OpenVZ is the choice.

One of the features to run different Operating systems apart from Linux then KVM is a solution, which provides better reliability and stability.
 
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