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Questions tagged [high-availability]

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure. Highly available systems are commonly implemented in situations where the risk outweighs the cost.

Best practices such as change control, standardized procedures, and monitoring can also enable high availability.

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Geo cluster - quorum vs Booth

I configured a geo cluster using pacemaker and DRBD. The cluster has 3 different nodes, each node is in a different geographic location. The locations are pretty close to one another and the communication between them is fast enough for our…
Rubinsh
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Auto rebooting down servers

Currently have a web server VPS in Germany with Hetzner. They are offering free load balancer service. Thinking about cloning my VPS in their Finland site (meaning adding another VPS with cloned setup/contents) for daily backups that can also…
cvlo
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Load Balance with proxmox and kubernetes with 3 physical server

We have 3 physical servers and We want to build a HA Kubernetes cluster on it. At the moment We use proxmox ve 6.2 and VM-s for Kubernetes. How can I provide load balancing between the three servers? If I create a Proxmox Cluster with the servers…
Bttd
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Why is HAProxy not redirecting all of the data that it hears?

I have set up a haproxy to redirect traffic to two machines. The goal is to have a scenario where sending a query from another machine to the proxy will be redirected to one of the machines 100% of the time. But for some reason, I sometimes get the…
Malazzar
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Load balancing and HA with Nginx

Preface: I'm trying to implement Blue-Green Deployment. With the following nginx.conf: http { upstream backend { keepalive_timeout 65; server django_blue:8000 fail_timeout=5s max_fails=1; server…
Andrea Rabbaglietti
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ActiveMQ Artemis: Quorum-only instance?

For a fully redundant ActiveMQ Artemis cluster, either a set of three broker pairs or network ping is required to avoid split-brain scenerios. In some installations, only two datacenters or availability zones are available plus a small third site…
Stephan
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How to acheive server high availbility without traffic redundancy?

GOAL: Acheive high availability in the server side, i.e. if one link goes down the other link sends the traffic without duplication. Explanation: I want to achieve high availability in the servers by connecting them via PRP card to two switches. The…
Raghad
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vSphere HA: Automatic shutdown of VMs to free up resources

Assume we have 2 ESXi hosts with these machines: ESX1: A1, B1, C1, D1 ESX2: A2, B2, C2, D2 A & B VMs are the most important VMs for us. We have configured vSphere HA in a test environment. The two hosts have been included in an HA Cluster. By…
user2798081
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Is it possible to create HA cluster on MacOS Catalina?

I couldn't find a documentation on configuring HA on Mac OS (Catalina). There's an application called Mac OS Server but the documentation doesn't talk anything about HA rather it looks to be an application to manage multiple devices. I'm planning to…
Vinod Balakrishnan
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What happens to existing tcp sessions when a certificate is changed and haproxy is reloaded?

There may be two major reasons for changing a certificate. 1. Ordinary rotation, for example, due to expiration. In this case I would like to have a 100% high availiability. Existing sessions would use the old keys, the new sessions will use new…
Edik Mkoyan
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Load splitting. Send duplicate packets to two or more servers behind a load balancer

Is there such a thing as a load splitter instead of a load balancer? I would like for traffic that hits my load balancer to go to 2 of my real servers. Can HA proxy be configured to do this?
Red Cricket
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1 Storage with 1 "big" partition + 2 servers

I need to setup an "cold fail over" to our database server. Since we cannot run an real HA because an software issue, I'm planning to connect 2 server to a single storage. If main server fails, I just need to start database service in second, as…
Zote
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DRBD node 2 doesn't become primary when node 1 restarts heartbeat but becomes Secondary/Secondary

I have an issue with heartbeat & drbd deployment for MySQL with 2 nodes on ubuntu 18.4. It used to work fine, but now it seems like its working, node1 has floating IP, MySQL runs on node1,drbd syncs, but when I restart heartbeat on node1, node2…
Perovic
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linux router, 2x NIC, HA with interface bonding, two ethernet switches

I have two NIC server (eth0, eth1) that I use as router. I have two switches working in stack. Is it a good idea / possible to create on them two bond lacp interfaces ( bond0, bond1 ). And use bond0 and bond1 as I now use eth0 (as external…
nnnTom
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How to setup High availability solution on DNS level?

I bought domain at namecheap and setuped at client panel my personal NS servers: ns1.example.com ns2.example.com 1) In case server ns1 unavailability, are all requests still come to ns1 or they all come to server ns2 ? How to setup abruptly switch…
Kein
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