Re: [CentOS] KVM HA

RHEV is a cloud solution with some HA features. It is not an actual HA solution. digimer On 23/06/16 12:08 AM, Eero Volotinen wrote: > How about trying commercial RHEV? > > Eero > 22.6.2016 8.02 ap. "Tom Robinson" kirjoitti: > >> Hi, >> >> I have two KVM hosts

Re: [CentOS] KVM HA

How about trying commercial RHEV? Eero 22.6.2016 8.02 ap. "Tom Robinson" kirjoitti: > Hi, > > I have two KVM hosts (CentOS 7) and would like them to operate as High > Availability servers, > automatically migrating guests when one of the hosts goes down. > > My

Re: [CentOS] KVM HA

On 22/06/16 02:36 PM, Paul Heinlein wrote: > On Wed, 22 Jun 2016, Digimer wrote: > >> The nodes are not important, the hosted services are. > > The only time this isn't true is when you're using the node to heat the > room. > > Otherwise, the service is always the important thing. (The node may

Re: [CentOS] KVM HA

On 22/06/16 02:34 PM, m.r...@5-cent.us wrote: > Digimer wrote: >> On 22/06/16 02:01 PM, Chris Adams wrote: >>> Once upon a time, John R Pierce said: On 6/22/2016 10:47 AM, Digimer wrote: > This is called "fabric fencing" and was originally the only supported >

Re: [CentOS] KVM HA

On 22/06/16 02:31 PM, John R Pierce wrote: > On 6/22/2016 11:06 AM, Digimer wrote: >> I know this goes against the >> grain of sysadmins to yank power, but in an HA setup, nodes should be >> disposable and replaceable. The nodes are not important, the hosted >> services are. > > of course, the

Re: [CentOS] KVM HA

Once upon a time, John R Pierce said: > of course, the really tricky problem is implementing an ISCSI > storage infrastructure thats fully redundant and has no single point > of failure. this requires the redundant storage controllers to > have shared write-back cache,

Re: [CentOS] KVM HA

On Wed, 22 Jun 2016, Digimer wrote: The nodes are not important, the hosted services are. The only time this isn't true is when you're using the node to heat the room. Otherwise, the service is always the important thing. (The node may become as synonymous with the service because there's

Re: [CentOS] KVM HA

Digimer wrote: > On 22/06/16 02:01 PM, Chris Adams wrote: >> Once upon a time, John R Pierce said: >>> On 6/22/2016 10:47 AM, Digimer wrote: This is called "fabric fencing" and was originally the only supported option in the very early days of HA. It has fallen out

Re: [CentOS] KVM HA

On 6/22/2016 11:06 AM, Digimer wrote: I know this goes against the grain of sysadmins to yank power, but in an HA setup, nodes should be disposable and replaceable. The nodes are not important, the hosted services are. of course, the really tricky problem is implementing an ISCSI storage

Re: [CentOS] KVM HA

On 22/06/16 02:12 PM, Chris Adams wrote: > Once upon a time, Digimer said: >> The cluster software and any hosted services aren't running. It's not >> that they think they're wrong, they just have no existing state so they >> won't try to touch anything without first ensuring it

Re: [CentOS] KVM HA

Once upon a time, Digimer said: > The cluster software and any hosted services aren't running. It's not > that they think they're wrong, they just have no existing state so they > won't try to touch anything without first ensuring it is safe to do so. Well, I was being short;

Re: [CentOS] KVM HA

On 22/06/16 02:01 PM, Chris Adams wrote: > Once upon a time, John R Pierce said: >> On 6/22/2016 10:47 AM, Digimer wrote: >>> This is called "fabric fencing" and was originally the only supported >>> option in the very early days of HA. It has fallen out of favour for >>>

Re: [CentOS] KVM HA

Once upon a time, John R Pierce said: > On 6/22/2016 10:47 AM, Digimer wrote: > >This is called "fabric fencing" and was originally the only supported > >option in the very early days of HA. It has fallen out of favour for > >several reasons, but it does still work fine. The

Re: [CentOS] KVM HA

On 6/22/2016 10:47 AM, Digimer wrote: This is called "fabric fencing" and was originally the only supported option in the very early days of HA. It has fallen out of favour for several reasons, but it does still work fine. The main issues is that it leaves the node in an unclean state. If an

Re: [CentOS] KVM HA

On 22/06/16 01:38 PM, John R Pierce wrote: > On 6/21/2016 10:01 PM, Tom Robinson wrote: >> Currently when I migrate a guest, I can all too easily start it up on >> both hosts! There must be some >> way to fence these off but I'm just not sure how to do this. > > in addition to power fencing as

Re: [CentOS] KVM HA

On 6/21/2016 10:01 PM, Tom Robinson wrote: Currently when I migrate a guest, I can all too easily start it up on both hosts! There must be some way to fence these off but I'm just not sure how to do this. in addition to power fencing as described by others, you can also fence at the ethernet

Re: [CentOS] KVM HA

On 22 June 2016 at 09:03, Indunil Jayasooriya wrote: > > When an UNCLEAN SHUDWON happens or ifdown eth0 in node1 , can OVIRT > migrate VMs from node1 to node2? Yep. > in that case, Is power management such as ILO needed? It needs a way to ensure the host is down to

Re: [CentOS] KVM HA

On 22/06/16 02:03 AM, Indunil Jayasooriya wrote: > On Wed, Jun 22, 2016 at 11:08 AM, Barak Korren wrote: > >>> >>> My question is: Is this even possible? All the documentation for HA that >> I've found appears to not >>> do this. Am I missing something? >> >> You can use

Re: [CentOS] KVM HA

On 22/06/16 02:10 AM, Tom Robinson wrote: > Hi Digimer, > > Thanks for your reply. > > On 22/06/16 15:20, Digimer wrote: >> On 22/06/16 01:01 AM, Tom Robinson wrote: >>> Hi, >>> >>> I have two KVM hosts (CentOS 7) and would like them to operate as High >>> Availability servers, >>>

Re: [CentOS] KVM HA

Hi Digimer, Thanks for your reply. On 22/06/16 15:20, Digimer wrote: > On 22/06/16 01:01 AM, Tom Robinson wrote: >> Hi, >> >> I have two KVM hosts (CentOS 7) and would like them to operate as High >> Availability servers, >> automatically migrating guests when one of the hosts goes down. >> >>

Re: [CentOS] KVM HA

On Wed, Jun 22, 2016 at 11:08 AM, Barak Korren wrote: > > > > My question is: Is this even possible? All the documentation for HA that > I've found appears to not > > do this. Am I missing something? > > You can use oVirt for that (www.ovirt.org). > When an UNCLEAN SHUDWON

Re: [CentOS] KVM HA

> > My question is: Is this even possible? All the documentation for HA that I've > found appears to not > do this. Am I missing something? You can use oVirt for that (www.ovirt.org). For that small number of hosts, you would probably want to use the "hosted engine" architecture to co-locate the

Re: [CentOS] KVM HA

On 22/06/16 01:01 AM, Tom Robinson wrote: > Hi, > > I have two KVM hosts (CentOS 7) and would like them to operate as High > Availability servers, > automatically migrating guests when one of the hosts goes down. > > My question is: Is this even possible? All the documentation for HA that I've

[CentOS] KVM HA

Hi, I have two KVM hosts (CentOS 7) and would like them to operate as High Availability servers, automatically migrating guests when one of the hosts goes down. My question is: Is this even possible? All the documentation for HA that I've found appears to not do this. Am I missing something?