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16 votes

DNS Round Robin: Do browsers stick to one IP as long as it is online?

Each browser has it's own method of handling round-robin DNS, I've spent some time today researching this problem and will continue to update my answer as I find proof of implementation which will ...
Jacob Evans's user avatar
  • 8,046
11 votes
Accepted

DNS issue with Failover IP from Hetzner

As promised, here goes my answer: Full disclosure: I'm not working for Hetzner, but worked for different companies in the past and present who used to colocate hardware at Hetzner. In case the ...
gxx's user avatar
  • 5,661
10 votes
Accepted

Keepalived send gratuitous ARP periodically

keepalived versions 1.2.20 and above support following config settings regarding gratuitous ARP, vrrp_garp_master_refresh is what I need. # delay for second set of gratuitous ARPs after ...
user373333's user avatar
10 votes

Server 2016 MSMQ failover

From my experience, MSMQ deploys find on top of clustered shared volumes. Therefore, any software shared solution that does mirror/present storage to Failover cluster as CSV will do the job. I can ...
Mr. Raspberry's user avatar
9 votes
Accepted

Server 2016 MSMQ failover

You can also stick with Always On scenario that doesnt assume a shared storage and where the overall health of your cluster would be determined by the votes of quorum of nodes in the cluster. But this ...
batistuta09's user avatar
  • 9,151
8 votes

DNS Round Robin: Do browsers stick to one IP as long as it is online?

All modern browsers implement this https://www.rfc-editor.org/rfc/rfc8305 Happy Eyeballs Version 2: Better Connectivity Using Concurrency Roughly that means that a server with fastest connection will ...
user602895's user avatar
8 votes

How to configure Failover IPs for High Availability with Hetzner Online

As this is an old answer I'm not sure if you are still looking for an answer. But I stumbled upon it looking for the best way on how to do this. The way Hetzner assigns a failover IP to a dedicated ...
Robbert's user avatar
  • 180
7 votes
Accepted

Complete High Availability System

If you do have just one Synology box shared between your Hyper-V machines, it can still be considered as a SPoF. It dies, you lose all the LUNs sitting there. For true HA you would need a second NAS ...
batistuta09's user avatar
  • 9,151
6 votes

How can I create shared disks for Windows SoFS VMs in VMware?

Even taking into account an upcoming "VHD Set" feature in Windows Server 2016, you would still need some shared storage to store VHDs. Try StarWind Virtual SAN or HP VSA, they both can present local ...
Strepsils's user avatar
  • 5,115
6 votes

"live" mirror of HA VM cluster?

1) Deploy a VMware vSphere cluster and use Fault Tolerance https://www.vmware.com/files/pdf/techpaper/VMware-vSphere6-FT-arch-perf.pdf feature on your virtual machines (as already mentioned above). 2)...
Net Runner's user avatar
  • 6,249
6 votes

Synology HA active-passive performance and failover

Decouple your Synology HA setup, RMA one of these units with "Your HA does not work!", and get VMware or similar vSAN to enjoy local disk performance, and reliability. Whatever you'll do you won't ...
BaronSamedi1958's user avatar
6 votes

How does Virtual IP work for failing over a TCP connection to a backup server to accomplish high-availability?

We should clarify some terms and technology. The image you show is that of a "Load Balancer." While technically, the Load Balancer will usually have one or more "frontend" IP addresses that connect ...
Appleoddity's user avatar
  • 3,870
6 votes
Accepted

Internal storage as HA failover cluster storage pool ?

As comments bellow say, Windows Server 2016 Datacenter Edition has built-in Storage Spaces Direct (S2D) that allows to implement/setup hyperconverged cluster of 2 or more nodes. However, it has been ...
Mr. Raspberry's user avatar
6 votes
Accepted

Azure Site Recovery unplanned failover

There are a couple of technet threads about this, one of them for example. I'd suggest you to collect the logs and contact Azure support, or, at least ask for the status of this thread. UPD: just ran ...
Net Runner's user avatar
  • 6,249
6 votes

ZFS: Handling massive no. of concurrent RW operations and failover

Neither ZFS nor BTRFS are intended to be replicated between instances in real time. You need to look into the specific category of Distribute File Systems. The Wikipedia page Comparison of distributed ...
AlexD's user avatar
  • 10.4k
5 votes

keepalived - random re-elections

The problem is that you use the default state MASTER for the backup nodes. They should state BACKUP. vrrp_instance VIP_61 { interface bond0 virtual_router_id 61 state BACKUP ...
pj3s's user avatar
  • 51
5 votes

nginx failover without load balancing

Extending chrskly's answer, you might want to configure 3 flags/configs. fail_timeout : Total time by failed attempts and also mark the server as DOWN for that same time. If 5 sec, then will try ...
Prakhar Pandey's user avatar
5 votes
Accepted

Use Ceph as redundant storage for failover FTP service?

Ceph needs quite many nodes to aggregate reasonable performance. http://ceph.com/planet/zero-to-hero-guide-for-ceph-cluster-planning/ If you only have two DRBD is your best friend. http://...
BaronSamedi1958's user avatar
5 votes
Accepted

Is it possible to have multiple storage servers in a failover cluster?

Yes, there are a whole slew of solutions for this. However, you haven't stated what OS you intend to use, or what scale this will be run at, or how this data is meant to be used. Those are some of the ...
Spooler's user avatar
  • 7,136
5 votes
Accepted

Two-Node Failover Cluster with internal storage

You need to upgrade to Windows Server 2016 and pay super-expensive Datacenter edition tax for your both hosts just to use Microsoft built-in SDS tech similar to what "Starwind and other third-party ...
BaronSamedi1958's user avatar
5 votes
Accepted

Synology HA active-passive performance and failover

Unfortunately, Synology HA feature does not support active-active mode. If you want to speed things up you might do RAID0 but it’s quite dangerous and will completely load your networks (especially on ...
batistuta09's user avatar
  • 9,151
5 votes
Accepted

Debian 9 - additional IP

Overall it's the correct way to do it as per the recently updated instructions in https://docs.ovh.com/gb/en/dedicated/network-ipaliasing/#debian-9-ubuntu-17-fedora-26-and-arch-linux because the ...
Keijo D Putt's user avatar
5 votes
Accepted

Full Mail Server Failover

There are two possible solutions: Store your mailboxes on a replicated storage. Depending on your performance needs you have a few choices: if we stay in the open-source / software-defined realm, I'd ...
Luca Gibelli's user avatar
  • 2,791
4 votes

Windows 2012 R2 Hyper-V cluster without shared hardware

You have two options in order to create a Hyper-V Failover Cluster using your current hardware: 1) Windows Server 2016 with Storage Replica http://www.tech-coffee.net/storage-replica/ that assumes ...
Net Runner's user avatar
  • 6,249
4 votes

How to setup failover with rabbitmq cluster with a loadbalancer like f5

I've done L4 loadbalancing for clustered RabbitMQ with Stingray load balancers - it works well, and we have done RR without any particular issue. In the event that one Rabbit node goes down, TCP ...
Brennen Smith's user avatar
4 votes

Failover Cluster Manager showing wrong interface for node

Launch FCM, specify a required cluster and go Networks. Then select the network you want to modify settings for and click Properties. This way you can allow or forbid cluster/client communication on ...
batistuta09's user avatar
  • 9,151
4 votes
Accepted

"live" mirror of HA VM cluster?

Servers shouldn't "just fail" in the manner you're describing. Most people do not worry about this. However, this is a use case for VMware Fault Tolerance (FT). This will do what you're asking for. ...
ewwhite's user avatar
  • 198k
4 votes

"live" mirror of HA VM cluster?

There are some solutions that can failover VMs without any downtime. At least I know about HPE VSA and Starwinds. They have free versions as well, so you can look at those. However, I don't know ...
Strepsils's user avatar
  • 5,115
4 votes

Failover Cluster file server performance issue with Windows Server 2016

Your first issue is NICs teamed for iSCSI. You never do that unless your both target and initiator support multiple connections per session and in your case neither of them does. https://www....
BaronSamedi1958's user avatar
4 votes

How to set up tcp check with keepalived?

If you do not need load balancing, track scripts offer failover based on checks run against your service. First, add a vrrp_script block before your vrrp_instance: global_defs { ...
talarczykco's user avatar

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