14
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 ...
- 7,756
14
votes
Accepted
How to setup redundancy for AWS Elastic Load Balancers?
ELBs are engineered to not be a single point of failure - a "single" ELB will have multiple IP addresses, which correspond to multiple ELB instances behind the scenes (the technology they're running ...
- 32.7k
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 ...
- 5,541
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 ...
- 3,878
9
votes
how to avoid timeouts during server reboot
Use a Loadbalancer Software with healthcheck like Zen-Loadbalancer or HA-Proxy.
There you can configure a healthcheck which pings or open a file on your Webserver and remove them from the Load-...
- 1,428
9
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 ...
- 630
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 ...
- 8,928
8
votes
Accepted
How to create a high-availability application server?
As your question is quite generic and doesn't give any details about the involved software, my answer is short as well: Just use a set of two loadbalancers, which share a 'virtual IP' between them via ...
- 5,541
8
votes
nginx use proxy cache if backend is down
Seems a duplicate of this:
https://stackoverflow.com/questions/16756271/how-to-configure-nginx-to-serve-cached-content-only-when-backend-is-down-5xx-re
In short, use proxy_cache_use_stale
As an ...
- 2,237
7
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 ...
- 170
7
votes
How to create a high-availability application server?
Your load balancer should be made highly available, by the simple expedient of having two devices acting cooperatively. At any moment, one of the two devices is configured to have the load balancer ...
- 95.8k
7
votes
Accepted
How does High Availability work?
it works quite simple. First rule is you have to have anything more than once. For simplicity I will setup it in one datacenter and with IP addresses owned by this DC (you can do it with your own IP ...
- 2,633
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 ...
- 8,928
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 ...
- 4,877
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)...
- 6,151
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 ...
- 12.7k
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 ...
- 3,438
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 ...
- 3,878
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 ...
- 6,151
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
...
- 51
5
votes
how to avoid timeouts during server reboot
Just to explain:
DNS Round Robin is not designed for the purpose you are using it for. It simply tells the DNS to hand out the available IP-addresses in an alternating manner; there is no feedback ...
- 651
5
votes
Accepted
Softlayer HAProxy with failover
I managed to get this set up, and here's how I did it:
I created a global IP address using SoftLayer's control panel.
I have Debian 7 on both HAProxy virtual servers. I added the global IP address to ...
- 22
5
votes
Accepted
Which method can I use to automate DNS-failover with monitoring?
Of cause there is, that's what those services are doing as well. :-)
It depends a bit how you're currently redirecting/distributing your users globally. Assuming that the results is effectively that ...
- 74k
5
votes
Accepted
Redis high availability and load balancing
Redis Sentinel will allow you to run multiple instances of redis and handles failover for you. http://redis.io/topics/sentinel
- 2,627
5
votes
How does HA / failover work?
You are confusing DNS and High Availability. Repeat after me: DNS is not failover. DNS is not failover. DNS is not failover.
If you want to do high availability and load balancing, you need a reverse ...
- 68.6k
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://...
- 12.7k
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 ...
- 7,026
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 ...
- 12.7k
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 ...
- 8,928
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 ...
- 66
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