Wednesday, 2019-05-01

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factorPresentations of the first day of the openstack summit.  https://www.openstack.org/videos/04:14
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masterpeHi, I have a question, what does the option image_upload_use_cinder_backend ?10:20
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Razva18:21 <Razva> Hey! One of my biggest "problems" with our current Xen/Proxmox setup is that users can freely use each other's IP address, because the software stack doesn't enforce any limits. Does OpenStack have the same behavior? What I want is very simple: allow a specific VM to use a specific IP, and only that IP.15:29
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DHEyes, port security is a thing by default15:31
RazvaGreat! How can this be enforced, thinking at the fact that the IP is not allocated "per VM" (a la LXC)?15:32
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DHEactually it is. ports are assigned a specific IP address from a subnet on a network, along with their MAC address15:33
larsksRazva: enforcement varies depending on your networking setup, but using the default openvswitch configuration it's enforced by flow rules on the openvswitch bridge to which vms are attached.15:34
DHEin linux bridge mode, bridge-calls-iptables mode is enabled and iptables rules are loaded forcing interfaces to use specific IP addresses15:35
RazvaSounds very, very good! So in theory I can be sure that, in a OpenStack setup, users will use only the IPs that they are allowed to use. All this via OpenStack software, without any physical networking and/or external switches. Correct?15:36
RazvaSorry for asking such questions, but my experience with OpenStack was kinda limited, made a POC 4-5 years ago.15:38
DHEit rather depends on how much control  you give users. I only allow users to use their own private networks, so any IP address conflicts would be internal to their own stuff anyway. for external access they get an openstack-managed NAT router which won't cause an IP conflict on the public side so I'm largely happy with that. so I just turned off port security15:39
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factorFlat network would need more restrictions, would think vlan would be their own IPs and could never interfere(in theory), even if they had the same ips.15:49
RazvaI don't want to give users access to the switch and/or Horizon. They'll have access only to the VM via SSH.15:49
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Razvaso long story short, OpenStack can do it, which is great.15:51
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factorYou bet15:51
factorWill say I've only worked with flat network. vlan takes more tunnel work. Will get to that at some point and make it easier for me :)15:53
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Razvanext question would be - and again, excuse my lack of knowledge - if OpenStack still is a pain in the arse to upgrade? When I made the initial POCs (on the Icehouse/Juno era), we decided that OpenStack is almost impossible to upgrade. Is still the case?15:55
factorI cant answer that. Will be putting it to the test. Want to do a write ups on it.15:56
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factorRazva, But off hand I have not seen any straightforward method for doing so, outside of migration. Moving data from one to another.15:57
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Razvafactor: yeah, that was the case on that time as well. Works great for small-scale deployments, can become a deal-breaker for public clouds with hundreds/thousands of VMs.16:01
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factorWant to dig in and find out, so I can answer that with certainty.16:03
factorAFK lunch time here. Trying to make a nice command and control frontend for Openstack. Which I want migration and upgrade paths.16:11
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DHEit does vary. I upgraded from Newton to Rocky and it went fairly well, if slow16:19
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jonspwWhat's the most ideal way to clean up "Instance 56fc0fc6-f2f5-4e94-9abf-bdeb2e2b4707 has been moved to another host hc02-tx.privatesystems.net(hc02-tx.privatesystems.net). There are allocations remaining against the source host that might need to be removed"?  I know how to remove the allocations via the API, but it seems to remove the allocations from BOTH hosts (can't find a way to only remove 1) and then I have to manually16:39
jonspwre-add the allocation for the proper host and this is quite a headache.  Is there some way to remove the allocatiosn then have nova automatically build the allocation properly that I'm just not finding?16:39
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factorDHE:Good to know.17:08
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larsksjonspw: oh, hey, I wrote a tool for that: https://github.com/larsks/os-placement-tools17:16
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jarbassaidai_ /nick jrubenst17:39
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jonspwlarsks looking into it17:41
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jonspwlarsks it worked great after a little tweaking to make it run right!18:22
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factorYeah , got Stein stable installed and running on my centos 7.6 load.20:32
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