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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.

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When to use Thanos/Cortex over Vanilla Prometheus?

Generally when I look around or try to understand the HA setup for Prometheus the most common search results are Cortex & Thanos. I've also seen M3 and Victoriametrics on the list. What I ...
Vipin Menon's user avatar
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48 views

very strange error HA k8s cluster with haproxy as load balancer

I am trying to create k8s cluster with haproxy as external load balancer ( 2 haproxy nodes, 3 control planes , 3 workers) currently am still trying with 2 haproxy and 2 control planes ERROR : ...
robinmetro1's user avatar
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1 answer
29 views

Hashicorp Vault transit auto unseal cluster is not receiving requests from transit seal configuration in main cluster (or requests are not being sent)

I am trying to set up auto-unseal for hashicorp vault using the transit secrets engine and two HA clusters. Cluster A is responsible for unsealing cluster B. My issue is that Cluster B (the main ...
Marcus Ruddick's user avatar
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63 views

High availability / load balancing methods for on-premises gateways for SaaS systems (gatway initiated connections)

While I have a specific setup I'm writing this as a general question so someone can bring some related ideas. I have a SaaS that uses a gateway inside my network to connect to my on-premises systems. ...
Iñigo García's user avatar
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1 answer
233 views

Multi master HA Kubernetes kubespray installation using kubevip fails

I'm trying to install a HA Kubernetes using Kubespray with Kube VIP. I followed the instruction of Kubespray for Kube VIP but it gets stuck on "TASK [kubernetes/control-plane : Kubeadm | Create ...
Mohammad Reza Ghahremani's user avatar
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237 views

RKE2 error- Waiting for API server to become available Waiting to retrieve kube-proxy configuration; server is not ready

Issue 1 In the high-availability RKE2 Kubernetes cluster, I have provisioned a single load balancer (1LB) and three master nodes. Initially, all components were functioning as expected. However, ...
user24266244's user avatar
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How HA works when both Fencing agent VM and VM1(part of cluster) dies?

Say I have 3 servers- Server 1 -> Fencing agent VM and VM1(part of pacemaker cluster) Server 2 -> VM2 (part of pacemaker cluster) Server 3-> VM3(part of Pacemaker cluster) Say server 1 die ...
user3924427's user avatar
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Can the kube-vip load balancing service implement jumps after a kubernetes node is notReady?

I'm new to kubernetes and I'm learning about high availability clustering, I'm using kube-vip for load balancing in the form of static pods. # kubeadm version kubeadm version: &version.Info{Major:&...
HuaJFrame's user avatar
1 vote
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58 views

Can I change controlPlaneEndpoint after kubernetes initialization?

I'm new to kubernetes and this is my kubernetes version info kubeadm version: &version.Info{ Major:"1", Minor:"27", GitVersion:"v1.27.3", GitCommit:"...
HuaJFrame's user avatar
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106 views

Deploy a Redis cluster in Kubernetes with High Availability

I am looking at deploying a Redis cluster (3masters, 3workers/slaves) on Kubernetes. I found the Redis Operator as being the best option but the “capability level” doesn’t look that attractive to me. ...
Jérémy Ferfer's user avatar
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Do we need to share /var/lib/nfs for NFSv4 recovery process?

As I read from NFSv4 recovery process, client also held states and can help in rebuilding the NFS state in case NFS server crashes. I am trying to build a active-passive NFS HA using drbd. Do I need ...
user2294468's user avatar
1 vote
2 answers
316 views

Access to Kubernetes service non-HA or HA cluster

My setup has previously been one control node (non-HA) and a few worker nodes on Kubernetes. New I'm building up a new cluster with three control nodes (HA) and 9 worker nodes. Connection from browser ...
ajlind's user avatar
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HA Cluster initialization issues

During the initialization of the very first control-plane-nodes (3 control-plane-nodes + 3 worker-nodes) I'm getting these errors : root@k8s-eu-1-control-plane-node-1:~# sudo kubeadm init --control-...
Raphael10's user avatar
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timed out waiting for the condition during Kubernetes Cluster Initialization with --control-plane-endpoint

Following the indications found here: https://github.com/kubernetes/kubeadm/blob/main/docs/ha-considerations.md#keepalived-and-haproxy I'm trying to initiate the very first control-plane-node , but I'...
Raphael10's user avatar
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200 views

A Diffrent HA Approach for Multi master Kubernetes Cluster

We have a client that has 3 nodes in different locations and different network subnets. They want to use our product with HA mode. We tell them that to run our product on HA mode we need to use an ...
Zekeriya Akgül's user avatar
4 votes
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126 views

Data Replication Approaches for Hot Standby Architecture

I'm relatively new to the world of storage & filesystems (please forgive me if I'm not using the correct language), and I'm currently researching ways to achieve a hot standby configuration -- i.e....
Pacopenguin's user avatar
5 votes
2 answers
304 views

Am I doing this wrong? Networking - High Availability: SAN, MSFT Failover Cluster, NIC Teaming

I have been working in a lab environment to figure out how to design a SAN with a Microsoft failover cluster using multiple NICs, MPIO and iSCSI. I'll try to add as much useful information as I can, ...
DOSed_And_Confused's user avatar
1 vote
0 answers
29 views

Fortify Software Security Center Database (HA) Issue

We have deployed Fortify Software Security Center in an environment with configured MSSQL ssc_db. How would I configure the High Availability Database configuration in Fortify SSC if possible? ...
Shahab Ali's user avatar
1 vote
1 answer
365 views

How multiple load balancers work

Assume we face x requests per seconds, where x is magic number of requests which single load balancer cannot handle. So we have to use multiple load balancers to handle all requests, yes? But how? I ...
Szyszka947's user avatar
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Red Hat Booth Ticket Issue

I am following this guide to implement booth ticket. I have two clusters with 2 nodes in each and 1 arbitrator node on centos 7 hosted on google vm. The prerequisite for having booth ticket is both ...
S S's user avatar
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3-node Pacemaker setup shows 1 node 2 times, with the same name, one online and one offline

So I've got: machine001, machine002, machine003. machine001 has 2 resources, machine002 has 1 resource. Normally they don't go on the same host, unless machine002 goes in standby. Recently, I saw ...
KoenDG's user avatar
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Windows Server quorum concept and split-brain issue prevention

I saw a similar question asked here that is closely related, but the provided answer doesn't entirely address my doubts. Assume a 3 node cluster is configured without a witness node, and all nodes are ...
user5539357's user avatar
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447 views

Can not start etcd cluster when setting up a HA K8S cluster

I am following this article to set up a HA k8s cluster: Guide: Kubernetes Multi-Master HA Cluster with kubeadm I have three master nodes(3,4,5) and four worker nodes(2,6,7,8) (one of the worker nodes ...
Erika's user avatar
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2 votes
1 answer
313 views

How do I (automatically) re-attempt to deliver mail from a different Postfix server?

My network consists of two different locations and in both I have a Postfix server running for outgoing mail on each of them. Mail gets submitted to any of the two round-robin, based on having them ...
gertvdijk's user avatar
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HAProxy and postgres

My haproxy configuration is as below, in the backend there is pg_autoctl cluster, another VM (bunty4) hosts the monitor and haproxy is installed on it. global maxconn 100 defaults log global ...
uozzyy's user avatar
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0 votes
2 answers
208 views

Load balance the Load balancer

I am looking to get load balancing for my load balancer. We are looking to create a fully HA network. All of our servers are redundant, the databases are redundant, but above them is a single server ...
bulgarian-beast's user avatar
0 votes
1 answer
111 views

communication failure between availability zones in one region in AWS

Is there a possibility for communication failure between availability zones in one region in AWS(assuming both AZs are up but only network communication failure)? If there is communication failure, is ...
rmp's user avatar
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1 vote
1 answer
472 views

keydb active-replica multi-master php session storage

I'm looking to use keydb/redis for php session storage in a HA setup. Currently, I have two keydb instances running with the following config: Instance 1 (192.168.2.10) requirepass pass123 masterauth ...
Aaron A's user avatar
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1 vote
1 answer
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Programmatically (SH Script) check which server is traffic routed/up too by HA Proxy

I have 2 HA Proxy servers with Keepalived configured with them, and have 2 backend servers to which traffic is routed by HA Proxy, am writing a shell script that will sync a directory between backend ...
MoonLight's user avatar
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0 votes
1 answer
296 views

Install HA Kube

I've tried following various different guides on installing HA kube and I cant get anything to work. My basic setup is to have 3 master nodes with Keepalived creating a virtual IP (10.10.20.30) and ...
MikeSchem's user avatar
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0 votes
1 answer
136 views

Will anycast failover to the next server if it encounters a 404 from an nginx server?

I know that anycast will failover for layer 3 issues but will anycast failover if a file is not present? I.E. like a 404? It seems like it won't, like as long as nginx returns something anycast will ...
user970705's user avatar
0 votes
1 answer
287 views

How to have two applications accessing a shared drive without isci config or shared lun?

We have a 2-node cluster configured using red hat high availability (pacemaker) but without shared storage i.e. each of the node has its own disk /dev/sda and /dev/sdb. We are not allowed to configure ...
Linzynarcon's user avatar
0 votes
1 answer
6k views

How to configure Keepalived Virtual IP?

I've been researching about Keepalived Virtual IP to make ProxySQL/MaxScale highly available and came across the concept of Virtual IP. All the articles that I've read just mentions a random Virtual ...
Nandni's user avatar
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3 votes
3 answers
655 views

How to create shared folder with Linux Samba Cluster that is accessible by Windows? (Two PCs in cluster with one IP)

does anyone know how to create a shared folder in any distribution of Linux that could be accessible by Windows and would be HA (high available)? Background: I have Windows Server cluster and it needs ...
TBS's user avatar
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2 votes
2 answers
842 views

DRBD does not sync files even though it is UpToDate

I recently set up a DRBD replication on two nodes, did the setup, mounted the drbd disk with "create-md", "up", "connect", etc. I, apparently, was successful when it ...
Froslass's user avatar
1 vote
1 answer
40 views

Can enabling load balancing on a cluster jeopardise high availability?

I'm considering enabling load balancing on our data gateway clusters for Power BI, where we have two servers in a cluster, and the secondary is configured as a failover for the primary (only ...
JTDotNet's user avatar
0 votes
1 answer
26 views

Can the mounted file system (NFS) be kept on another host if the VM is evacuated?

I'd like to know about OpenStack High Availability. If the node (VM) mounts the file system (NFS) (https://docs.openstack.org/cinder/latest/admin/nfs-backend.html) and the VM is evacuated in case of ...
k-z-i's user avatar
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0 votes
1 answer
136 views

Configure and connect fence device through proxy server?

I'm setting up a cluster with Pacemaker and Corosync (from Clusterlabs). It works fine but i need to configure the fencing. Servers run on a VMWare ESXi infrastructure. I have a frontend server (with ...
BeWog's user avatar
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-3 votes
1 answer
130 views

How can we move secondary IP address of from one NIC to other in Azure

I want to implement HA system on azure, for that I need to move secondary IP address of active vm to standby vm as soon failover happens, how can we do this?
yogesh deshpande's user avatar
0 votes
1 answer
148 views

redundant load balancer for Tomcat

I have three Tomcat webservers in a VMWare cluster. In the first place we thought of using Apache as a load balancer in physical server but this would be a SPOF. I have searched around and I found ...
miguelgc's user avatar
0 votes
1 answer
323 views

How can I assign same private IP 10.3.3.51 to two azure vm having differnt MAC address? only one vm will be providing service at a time

I have two vms behind the Azure Load balancer working as High availability that is only one vm is providing service at a time, other vm will be in passive state. I want to keep same IP address 10.3.3....
yogesh deshpande's user avatar
0 votes
1 answer
4k views

Keepalived going split brain when Firewalld is running

I'm using keepalived to provide availability between two Alma 8 Nginx servers (hosted on VMWare if that's of any relevance). When firewalld is enabled, despite a rich rule being set for VRRP, when I ...
motorleague's user avatar
1 vote
1 answer
1k views

RabbitMQ quorum queues - have node automatically rejoin

I am exploring RabbitMQ quorum queues to improve HA for some services in a Kubernetes cluster. As I am reading, they are designed with data safety in mind. However, the chapter "Managing Replicas&...
matpen's user avatar
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0 votes
0 answers
48 views

Apache limits errors when scalling with many domains for Saas app

**Hello everybody , I making SaaS app like Shopify and ecwid , user create store within 10 mins , once he register he get automatic subdomain with SSL and can add products and payment methods, ...
mo saleh's user avatar
1 vote
0 answers
402 views

On Debian system, keepalived is consuming full cpu usage on both kibana nodes

I have master/slave kibana machines on Debian 10. From few days, cpu usage of keepalived daemon on both nodes are reaching to 100%. After keepalived restart it goes to normal, and this loops forever. ...
Roushan Jha's user avatar
0 votes
1 answer
436 views

Pacemaker/Corosync: how to emergency-shutdown all resources (VMs qemu/kvm)

Good morning everyone - Running a 6 node Pacemaker/Corosync cluster with lots of productive qemu/kvm VMs on it, we were wondering how to best do an "emergency shutdown" of the whole lot, ie. ...
Christian's user avatar
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1 vote
0 answers
120 views

How does hybrid unicast/anycast work for global load balancing?

In the Dropbox Edge network write up, the author mentions that they have taken a hybrid approach by announcing both unicast and anycast ip of PoP. One can enable this hybrid GSLB by announcing both ...
bornfree's user avatar
  • 111
-1 votes
1 answer
58 views

How to improve my current HA design

I am trying to create high availability application. My current design has two VMs, both have public IPs, both are running in same subnet and both VMs have same web application running in docker. ssl ...
Sandy's user avatar
  • 99
0 votes
2 answers
260 views

HA in k8s cluster in case of node failure pointed by A record of domain

I've got a question of "what if" kind Suppose there is a Kubernetes cluster with 4 nodes and some domain which points to IP of node no 1 and web app using this domain having 1 pod per node. ...
Jack's user avatar
  • 1
1 vote
1 answer
120 views

Generic high availability abstraction for application possible? [closed]

I am currently examining the possibilities to make our existing server application highly available. The software handles messages that come via UDP resp. some higher level railway-specific protocols. ...
Rob's user avatar
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