[ovirt-users] High availability when both engine host and host with application vm failed
I want to make a setup, when workload is distributed between two sites are high availability mechanism protects from one site failure, restarting vms on another site. Scenario I use: 1. Poweroff hosted engine host, and then host with highly-available vm 2. Engine comes back on another site (which is fine). 3. What I expect, engine finds, that there's a host not available with HA vms, and restart these vms on another host. But, I only see in logs, that engine reports, that it cannot connect to that host (java.net.NoRouteToHostException: No route to host). Whel I poweroff just server with app vm, High Availability works correctly, performs fencing and restarts vm on another host. I use release 4.1 from RedHat. Has anyone faced similar issue? And, if yes, how could that be toubleshooted? Thank you in advance, Sergei. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] High Availability Setup with oVirt
On Tue, Aug 15, 2017 at 6:25 AM, Anantha Raghava < rag...@exzatechconsulting.com> wrote: > Hi, > > I am trying to setup ovirt clusters in two different locations and > replicate the data between two sites so that in case of failure in primary > site, I can bring the VM up in secondary site in quick time with minimum > data loss. Can we do this oVirt? > > I was thinking of using DRBD, however read somewhere that oVirt plugins > are still under development > How about Gluster geo-replication? Y. > -- > > Thanks & Regards, > > > Anantha Raghava > > Do not print this e-mail unless required. Save Paper & trees. > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] High Availability Setup with oVirt
Hi, I am trying to setup ovirt clusters in two different locations and replicate the data between two sites so that in case of failure in primary site, I can bring the VM up in secondary site in quick time with minimum data loss. Can we do this oVirt? I was thinking of using DRBD, however read somewhere that oVirt plugins are still under development -- Thanks & Regards, Anantha Raghava Do not print this e-mail unless required. Save Paper & trees. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] high availability
On Fri, Feb 3, 2017 at 9:49 PM, Yaniv Kaul wrote: > > > On Fri, Feb 3, 2017 at 8:42 PM, cmc wrote: >> >> Hi, >> >> I have some questions about oVirt's high availability features for >> VMs. My understanding is that it relies on the engine host to monitor >> and manage the hypervisor hosts, so that in the case of a >> unrecoverable failure of one those hosts, it will fence the host and >> migrate any VM that is designated as highly available to another host >> in the cluster. However, if the engine is itself hosted as a VM on a >> host that fails, this process cannot take place, as the engine will be >> down and cannot initiate monitoring, fencing and migration - is that >> correct? > > > The hosted-engine has its own HA mechanism. You may find this useful: http://www.ovirt.org/documentation/self-hosted/Self-Hosted_Engine_Guide/ > In addition, in 4.1 we are introducing a feature which allows HA without > fencing, in a similar manner to hosted-engine - by a lock on the storage > side. For more info on this see: https://www.ovirt.org/develop/release-management/features/storage/vm-leases/ Nir > Y. > >> >> There is the option of hosting the engine externally on dedicated >> hardware, or on another cluster, but then it is still a single point >> of failure. I recall reading about plans for an HA engine in the >> future though. >> >> Can someone tell me what the roadmap is? Is there a plan to put >> something like an HA agent on all the hypervisors in the cluster so >> there is no single point of failure? >> >> Thanks for any information, >> >> Cam >> ___ >> Users mailing list >> Users@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users > > > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] high availability
On Fri, Feb 3, 2017 at 8:42 PM, cmc wrote: > Hi, > > I have some questions about oVirt's high availability features for > VMs. My understanding is that it relies on the engine host to monitor > and manage the hypervisor hosts, so that in the case of a > unrecoverable failure of one those hosts, it will fence the host and > migrate any VM that is designated as highly available to another host > in the cluster. However, if the engine is itself hosted as a VM on a > host that fails, this process cannot take place, as the engine will be > down and cannot initiate monitoring, fencing and migration - is that > correct? > The hosted-engine has its own HA mechanism. In addition, in 4.1 we are introducing a feature which allows HA without fencing, in a similar manner to hosted-engine - by a lock on the storage side. Y. > There is the option of hosting the engine externally on dedicated > hardware, or on another cluster, but then it is still a single point > of failure. I recall reading about plans for an HA engine in the > future though. > > Can someone tell me what the roadmap is? Is there a plan to put > something like an HA agent on all the hypervisors in the cluster so > there is no single point of failure? > > Thanks for any information, > > Cam > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] high availability
Hi, I have some questions about oVirt's high availability features for VMs. My understanding is that it relies on the engine host to monitor and manage the hypervisor hosts, so that in the case of a unrecoverable failure of one those hosts, it will fence the host and migrate any VM that is designated as highly available to another host in the cluster. However, if the engine is itself hosted as a VM on a host that fails, this process cannot take place, as the engine will be down and cannot initiate monitoring, fencing and migration - is that correct? There is the option of hosting the engine externally on dedicated hardware, or on another cluster, but then it is still a single point of failure. I recall reading about plans for an HA engine in the future though. Can someone tell me what the roadmap is? Is there a plan to put something like an HA agent on all the hypervisors in the cluster so there is no single point of failure? Thanks for any information, Cam ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] high availability
Thanks! I'd like to try it out. From: Yaniv Dary Date: 2017-01-04 19:24 To: qinglong.d...@horebdata.cn CC: users; Martin Sivak Subject: Re: [ovirt-users] high availability In oVirt 4.1 we are planning to allow VM leases that will allow you to restart HA VMs in this use case even without power management. We would love some feedback on this on the latest tested build, if you want to try it out: https://github.com/nirs/ovirt-site/blob/77669161397ebf4cc15c66e0e6876bc033384cfc/source/develop/release-management/features/virt/vm-failover-using-vm-leases.html.md Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: yd...@redhat.com IRC : ydary On Wed, Jan 4, 2017 at 11:33 AM, Martin Sivak wrote: Hi, high availability requires power management to be configured properly for your hosts. The VM won't be restarted until we can ascertain the status of node2 (because it can still be up). The host is Non responsive, meaning we do not know if it is up or down. That is the reason we show the VM status as unknown. You can fix that by configuring power management for node2 or by right clicking and selecting Confirm host has been rebooted menu option. Regards -- Martin Sivak SLA / oVirt On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn wrote: Hi, all I have an ovirt 4.0 environment with two hosts and a hosted engine. The engine vm was running on host 1 and another vm was running on host2. Then I unpluged the power of host 2. The another vm should be supposed to restart on host 1 because of ha feature. But it couldn't. It stayed unknown status all the time. And the host 2 stayed non responsive status. Did I understand ha correctly? Anyon can help? Thanks! ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] high availability
In oVirt 4.1 we are planning to allow VM leases that will allow you to restart HA VMs in this use case even without power management. We would love some feedback on this on the latest tested build, if you want to try it out: https://github.com/nirs/ovirt-site/blob/77669161397ebf4cc15c66e0e6876bc033384cfc/source/develop/release-management/features/virt/vm-failover-using-vm-leases.html.md Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: yd...@redhat.com IRC : ydary On Wed, Jan 4, 2017 at 11:33 AM, Martin Sivak wrote: > Hi, > > high availability requires power management to be configured properly for > your hosts. The VM won't be restarted until we can ascertain the status of > node2 (because it can still be up). > > The host is Non responsive, meaning we do not know if it is up or down. > That is the reason we show the VM status as unknown. > > You can fix that by configuring power management for node2 or by right > clicking and selecting Confirm host has been rebooted menu option. > > Regards > > -- > Martin Sivak > SLA / oVirt > > On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn < > qinglong.d...@horebdata.cn> wrote: > >> Hi, all >> I have an ovirt 4.0 environment with two hosts and a hosted >> engine. The engine vm was running on host 1 and another vm was running on >> host2. Then I unpluged the power of host 2. The another vm should be supposed >> to restart on host 1 because of ha feature. But it couldn't. It stayed >> unknown status all the time. And the host 2 stayed non responsive status. >> >> Did I understand ha correctly? Anyon can help? Thanks! >> >> ___ >> Users mailing list >> Users@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >> > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] high availability
Hi, high availability requires power management to be configured properly for your hosts. The VM won't be restarted until we can ascertain the status of node2 (because it can still be up). The host is Non responsive, meaning we do not know if it is up or down. That is the reason we show the VM status as unknown. You can fix that by configuring power management for node2 or by right clicking and selecting Confirm host has been rebooted menu option. Regards -- Martin Sivak SLA / oVirt On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn < qinglong.d...@horebdata.cn> wrote: > Hi, all > I have an ovirt 4.0 environment with two hosts and a hosted > engine. The engine vm was running on host 1 and another vm was running on > host2. Then I unpluged the power of host 2. The another vm should be supposed > to restart on host 1 because of ha feature. But it couldn't. It stayed > unknown status all the time. And the host 2 stayed non responsive status. > > Did I understand ha correctly? Anyon can help? Thanks! > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] high availability
Hi, all I have an ovirt 4.0 environment with two hosts and a hosted engine. The engine vm was running on host 1 and another vm was running on host2. Then I unpluged the power of host 2. The another vm should be supposed to restart on host 1 because of ha feature. But it couldn't. It stayed unknown status all the time. And the host 2 stayed non responsive status. Did I understand ha correctly? Anyon can help? Thanks! ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users