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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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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 ...
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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?
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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 ...
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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....
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docker swarm - highly available database

I am using high availability on two servers, where I use docker swarm with two manager nodes (one is the leader) with their respective applications (backend and frontend) and I use haproxy to redirect ...
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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 ...
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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&...
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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, ...
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Recommended Proxmox configuration for a 3 nodes cluster with 2 nodes connected to a DAS?

I am aiming to get a 3 nodes proxmox cluster with 2 nodes connected to a DAS with this topology : Circuit The idea behind this configuration is to have an HA cluster and a HA storage. What I had in ...
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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. ...
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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. ...
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Docker swarm HA - restarting manager node while original node is unavailable

I've got a network of five docker managers, 1 through 5. (IP addresses x.x.x.101 through 105) The managers all joined with docker swarm join --token xxxx x.x.x.101:2377 As such, I expect to be able to ...
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keepalived(or another solutions) between 2 interfaces one server

community. Could you help me with the next question? I'll have a server Linux with 2 NIC in the same network ens33 192.168.23.2 ens34 192.168.23.3 and plugin in different switches: I want to use ...
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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 ...
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Keepalived and HAProxy on 3 VMs

I have a setup with 3 nodes each has keepalived and HAProxy installed. Keepalived is installed on the VM but HAProxy is running as part of a docker swarm. HAProxy is running on host network mode. ...
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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 ...
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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. ...
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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. ...
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Configuring STONITH on non-shared disk cluster

I have configured a 2 node (VMs) cluster with SUSE High Availability Extension. The cluster doesn't use shared disk. So Stonith is not really required. But the cluster keeps on asking for Stonith. So ...
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High availability with round robin - rsync and DB replication or a cluster?

I have one machine (centos7) with Apache, PHP, MariaDB and Nginx, Nodejs, MongoDB installed and being used by many different domains. I'd like to create a working mirror and can't decide between 2 ...
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15 minute timeout in HA k8s cluster when node stops

I set up a k8s cluster more or less following this guide. So I have three master and control-plane nodes. I use haproxy as load balancer with following config: #/etc/haproxy/haproxy.cfg #--------------...
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PCS two nodes resource start at the same time

I am configuring a two nodes cluster Active/passive where the resources of one node is up at a time, so I added two resources IP address and service, The problem is that after configuring the cluster ...
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PFsense High-Availability - issues with sync of VLAN interface

So I am trying to build a firewall with a primary and secondary, High-Availability structure. I have configured each of these 2 VirtualBox VMs in GNS3 to connect to each other (for a SYNC) interface, ...
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Ubuntu HA cluster advisory resource placement for service that preferably runs on remote node but can failover to local

I am setting up a ubuntu linux HA cluster. I referred to (https://ubuntu.com/server/docs/ubuntu-ha-introduction). I am also reading through the clusterlabs documentation at https://clusterlabs.org/...
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rspamD - multiple server setup

i already use rspamd within my mailserver construct. Currently there is only 1 rspamd instance on 1 server. For HA reasons i'd like to change this and add another rspamd server into my mailconstruct. ...
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How to setup HA Application Cluster on SD-WAN (Fortigate) across sites

I've had experience building simple HA clusters with HAProxy and Keepalived on a single network and have a general idea how to do it when I control all the pieces (or in AWS). But here is my question ...
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mirror cluster replication software

I'm looking for an alternative to the safekit software which handle high availability using active/passive redundant servers with real-time replication and failover. Actually we have 2 distant servers,...
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How to deploy multi master Microsoft SQL database as IaaS or AWS RDS

We have a vendor product, which support only relational databases (Oracle and MS SQL). Due to operational efficiency and cost, we are planning to use MS SQL. However, we have a challenge to deploy the ...
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How handle chaos with service less pods across multi cluster

I’ve two cluster on different region, I want to deploy an app that doesn’t need service. How can I deploy this app on one cluster and if something goes wrong on this cluster (region offline, cluster ...
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4 votes
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2 Different Public Address for High Availability

this is my first time asking a question here, and I was wondering is it possible to have two different ISP public IPs connected to a single system for high availability? for example, if our ISP 1 ...
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mountd state directory in HA setup using cluster filesystem

I am running a Spectrum Scale filesystem on RHEL8 that is exported via NFSv3. The HA part is done by ctdb using 4 nodes (active-active), following this configuration guide by the samba/ctdb people: ...
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Best practices for updates

We have a lot of Linux servers (Red Hat Enterprise Linux Server 7.9 running vmware) and most of the services are in containers docker. We want to implement a policy of updating our systems with ...
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Error in Wallaby Openstack segment unable to create

I have a problem in Masakari, when I want to create segment for HA based on Masakari document with this command: openstack segment create I get this error: Request requires an ID but none was found
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What exactly is a floating IP and how does it work?

I am setting up a high availability load balancer. I found this tutorial from Digital Ocean which says that two load balancers can share a common floating IP. https://docs.digitalocean.com/products/...
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NFS instance in availability zone - AWS

My team has the task to build a plan in case the AZ that has the NFS instance fails. This NFS instance shares files with others machines (NFS clients) in others AZ (we use North of California). We ...
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Using (dual) ATS for dual PSU server?

There's two parts to my question: Does it make sense to hook up a dual PSU server to an ATS to speed up failover to the secondary circuit? If yes, does it make sense to use two separate ATSes to ...
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Mirroring Traffic with Nginx(to increase avaliablity and decrease latency )

I need to duplicate/mirror the traffic comming to my server. I mean, I have N backend servers A1 A2 ... An(n>=2) and a nginx as reverse-proxy&load-balancer. All the traffic comming to Nginx ...
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Adding Virtual IP to ens224 after using ens192 as interface using keepalived

I have two instances that can interact using internal IPs (ens192), for ex: <server_1_internal> <server_2_internal> When I use ens192 as the interface, keepalived works as expected by ...
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Data consistency in SQL AlwaysOn Availability Group

I have an AlwaysOn cluster of SQL Server 2019, containing an Availability Group of 3 replicas in Synchronous mode. According to Microsoft documentation: The secondary replica hardens the log and ...
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Backend multiples apache 2.4 sync settings virtualhost

I have a set of apache 2.4 backend (Ubuntu server) with the same virtualhost and same configurations (the content is accessible through an HTTPS balancer) how could I easily replicate this ...
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Need a simple High Availability file share

I am looking for the simplest way to share a single file in a high availability way between a pair of linux servers. (Version and distribution are unimportant, I'm looking for a generic solution.) I ...
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1 vote
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load balance for kubernetes master on different subnet

I'm trying to build an architecture for new k8s cluster with master HA on different sites (different subnets). The issue I'm facing is finding an open source Software Load Balance (there is no ...
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VLAN - Network Redundancy With Same 2nd Switch?

Is it possible to set up the same VLANs on two different switches with same IPs, but different MACs on dual port network cards of servers? In case switch 1 is down or needs maintenance I would like ...
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Centos 7, HA postgresql12, patroni with etcd v3.4

I followed this document but dont know how to enable v2 so that patroni can work with, can anyone help? https://computingforgeeks.com/setup-etcd-cluster-on-centos-debian-ubuntu/
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RAID recommendation for managing redundancy of 16 disks

I need advice for how to setup RAID for a server that has an array of 16 disks (boot/OS disks are outside this array). In this 16-disks array, all disks are identical (12.8TB SSDs). The ideal solution ...
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How long does it take to failover with oVirt/RHEV?

I'm trying to get a better understanding of what is achieved by using RHEV/oVirt (or other OSS solutions) in an HA cluster. I'm interested in knowing how long it takes to fail over, and what exactly ...
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Zero downtime with Kubernetes on top of GlusterFs on top of a ZFS raid - Is this the best solution?

TL;DR A client requests me to make a robust system to run containerized microservices within their LAN. Restriction: They give me 2 machines and 6 data-disks. No more hardware. I have to build "...
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Keepalived increasing slave/master promotion interval/timeout (advert_int) not working

I am trying to increase the default interval (advert_int) which triggers a slave to master promotion which seems to be 1 second by setting it on keepalived.conf to 3 seconds: vrrp_instance VI_1 { ...
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high availability with keepalived and nginx on ubuntu

I have two identical linux servers serving the same content through nginx. I want to have high availability through failover with keepalived, that is, server number 1 always serves the content of ...
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SQL Server Always On Availability Group Zero Downtime Update Procedure

Here I have a 2-node SQL Server 2016 AlwaysOn Availability Group cluster, with 1 primary and 1 secondary. The question is - what is the optimal way to install Microsoft Updates on the servers in the ...
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