Citrix Hypervisor 8.1 released
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I'm honestly looking forward to the removal of DMC. It has caused more issues for me than it offers benefits
I can see how this can cause problems for those who relied on it to over subscribe memory resources though.Also noticed they are deprecating the vSwitch Controller.
@olivierlambert do you and the team have any plans to offer a solution that may fulfill some of the missing functions from the vSwitch Controller like VM Access Control List (ACL) rules or any other types of ACLs for network traffic as part of the SDN plug-in or some other plug-in?
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@GHW We don't have plan because we don't know what people want more than what we released in our SDN controller plugin. Feel free to share specs on what you need so we can review how long it could take to make it real.
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Do you mean that Dynamic Memory (balooning) won't be available in XCP-ng 8.1?
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@GHW I agree ... they failed to apply the same level of reliability during live migration as VMWare has ...
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I saw, they announced that it will become obsolete, but they did not announce whether there will be a replacement or not.
We will have to wait for the next chapters.They might well say what the possible future plans are.
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@olivierlambert at this time the only feature that I was interested in is the VM level access control list function
I was working on a plan to build a pool with an internal network and an external network connected directly to the Internet. I wanted a central solution for controlling IP and port access for VMs on the external network and after much research and planning I ended with the vSwitch controller despite its annoying dependency on IE.
The main reason I was planning to settle with the vSwitch controller was because of its ability to enforce the access control list policy. The other ideas I entertained were:
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Set iptable rules within the VM....but if a user changes the rule set or disables the firewall then it no longer matches the approved/required policy
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Use and automation tool like Ansible....but it also faces an issue if the user changes the rule set or disables the firewall within the VM
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Searched for paid solutions(software and/or SaaS) that could achieve this task....I did find one solution that claimed to offer just that but it seems the company behind it is no longer active. I also found other solutions that offer it as part of a bigger $100K type solution that is currently out of scope budget wise
In the end I was planning to settle with the vSwitch controller because I found no other viable solution and it can enforce the rule set/policy outside of the VM's control space....until I saw the plans to deprecate the feature
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I'm not happy to see DMC dropping, but even more removal of "VSS and quiesced snapshots" is sad.
It's probably one more step from general Hypervisor solution to VDI, as it's not really important there, but if you have DB servers etc... -
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@olivierlambert the idea of iptables for the VM, Ansible etc. were just other options I looked into as alternatives because DVSC was not my first choice option due to its limitations of only supporting IE and the "heavy" DVSC appliance
The specific feature that I wanted to use is the "Access Control policies" to achieve something similar to AWS security groups. https://docs.citrix.com/en-us/citrix-hypervisor/vswitch-controller/virtual-network-visibility.html#set-up-access-control-policies
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@GHW @olivierlambert The Access Control lists in the DVSC instance was easily one of its most powerful and useful features. It essentially turned the DVS into an actual port-level security capable virtual switch. If it had full-featured routing, it would have been a very nifty solution to layer 3 in the virtual network space without having to run an entirely different appliance to achieve that capability. Perhaps that is something that the SDN could do at some point? (become a layer 3 capable switch with security access control)
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Sadly I have no DVSC knowledge myself, so it would be great if you are able to explain in a kind of simple "high level specification" (eh "doing this in the UI with a screenshot, it does that") in a Github issue for SDN plugin, we might implement it on our side
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So does the removal of the DMC mean that we wont be able to over-commit memory anymore?
Regards,
Marty -
@olivierlambert said in Citrix Hypervisor 8.1 released:
Sadly I have no DVSC knowledge myself, so it would be great if you are able to explain in a kind of simple "high level specification" (eh "doing this in the UI with a screenshot, it does that") in a Github issue for SDN plugin, we might implement it on our side
A bit of good news is that the DVSC works out of the box with XCP-ng 8.0. Though I have not tested it in conjunction with the SDN plug-in.
After importing the DVSC and adding it to the resource pool:
.1) Select the VM you want to apply security ACLs to
.2) Select "Access Control" and here you can create a network ACL policy to control traffic to and from the VM (by default there are no restrictions)
.3) Apply your desired network security policy to the VM
Results
Allows ping to 8.8.8.8 but blocks ping to 8.8.4.4 since it is not allowed in ACL policy
Allows access to HTTP web server as defined in the the VM network ACL policy and blocks access to the other
Restricts SSH access to trusted hosts
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Thanks I'm pinging @BenjiReis who built the SDN plugin
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@olivierlambert thanks
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@GHW this is in our internal roadmap. So before doing any promises, we'll see first if we can do a working PoC. Depending on priorities, we could target a firm answer (will it be released one day) in Q1, and if yes to the previous question, might be Q2.
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@olivierlambert Awesome and thank you for the follow-up.
