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.

Filter by
Sorted by
Tagged with
1
vote
1answer
16 views

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 ...
1
vote
1answer
66 views

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 "...
0
votes
0answers
39 views

Is MySQL HA via Kubernetes a tried and proven solution?

I'm working on a project which is about to migrate to a new production environment. One of the key components in this project is a MySQL database. The MySQL database must be highly available. We're ...
0
votes
0answers
50 views

Keepalived not sending or replying to ARP requests Ubuntu 20.04 Server

I am not able to ping the virtual IP of keepalived. When I checked further, I found that keepalived is not sending ARP requests or reply. None of the hosts in same network received gratuitos APR ...
0
votes
0answers
16 views

High availability routing - Use another path if main route is not working - Best approach?

I need to switch to another network route in Debian 10 only if the main gateway is not routing my packets properly. How you would approach this scenario in the cleanest way? Unfortunately this will ...
1
vote
0answers
25 views

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 { ...
0
votes
1answer
26 views

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 ...
3
votes
1answer
51 views

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 ...
0
votes
0answers
17 views

Way to go for “dynamic” HA load balancing reverse proxy?

So what I want to do is, reverse proxy to a specific port based on the domain. e.g.: example.net => 10.0.0.1:10001 example.com => 10.0.0.1:10002 example.de => 10.0.0.1:10003 and so on The ...
0
votes
1answer
29 views

Is it possible to deploy a high available file service with two file servers using a shared virtual hard disk and DFS with Windows Server 2019?

In my infrastructure, I have two servers with Windows Server 2019 and Hyper-V installed. A SAN is directly connected to both servers via FC. The SAN provides three volumes to both servers: a volume ...
1
vote
0answers
39 views

Preparing storage for DRBD

I am trying to set up high availability Linode server and using DBRD for data replication. I created primary partition using fdisk. But I get the error WARNING: Re-reading the partition table failed ...
0
votes
0answers
22 views

Pacemaker Apache SSL failed

Sorry for repeating ask question. I am so exhausted with SSL with pacemaker.. I tried my level best and I didn't found the solution. wget --no-check-certificate https://localhost/server-status --...
0
votes
0answers
61 views

implementing a failover service for containers

Two VMs are hosted on the same machine, let's name them VM1 and VM2. Both VMs are hosting a runC container running a server application, a client is running directly on the host machine and is ...
-2
votes
1answer
149 views

Differences between VMware and XCP-ng hipervisor

I am currently researching XCP-ng hipervisor and I was wondering what are the main differences between the XCP-ng and VMware hipervisor. As far as I can see the XCP-ng does not have high availability ...
0
votes
1answer
30 views

HA proxy is really needed?

I have the following infra : 3 servers which handle micros services. In front, I have one single proxy server which exposes services or website following the domain name. I would to improve this with ...
0
votes
0answers
15 views

How to troubleshoot Virtual IP not switching over to the MAC address of failover server

A Virtual IP was set up for hosts db1 and db2 to share. They are both running RHEL 8. These hosts are configured with keepalived using VRRP to failover the virtual IP address from the master (db1) to ...
0
votes
0answers
140 views

Microk8s ( Kubernetes ) for Mysql High- Availability

I am trying to setup MySQL HA Database with Microk8s Kubernetes. The goal is to have MySQL running on all 3 nodes with 1 floating IP in between them, and that if any of the nodes bursts up in flames ...
0
votes
0answers
279 views

pcs status shows online but pcs cluster status shows offline

I have a problem to communicate with my servers. currently i have 3 debian 9 server (server1,server2,server3). pcs status Cluster name: vipcluster Stack: corosync Current DC: server1 (version 1.1.16-...
0
votes
1answer
290 views

WSFC DNN Listener Resolving to secondary in Availability Group

I have an Azure AO AG which consists of three servers (all WS-2019 & SQL-2019CU3): A - Subnet 1 - Principal Server (Sync) B - Subnet 1 - Secondary Server (Sync) C - Subnet 2 - Secondary Server (...
0
votes
0answers
217 views

CentOS 7 - GlusterFS & Pacemaker & Corosync

I try to install a little GlusterFS (for NFS) Cluster with CentOS High Availability. I have really no idea why it failed. I started multiple times from scratch. My problem is, that I can't see any ...
0
votes
2answers
402 views

Haproxy with MySQL Cluster Setup

I have 2 MySQL servers with master-master replication between them. The replication is working fine. I need to configure high availability between them so that if either one of them goes down, the ...
0
votes
0answers
30 views

Upto what number of nodes can keepalived / CTDB HA softwares scale for IP failovers?

We are trying to build a high availability cluster with a support to highly scalable architecture. In an effort we plan to use - DNS server to distribute client requests across N nodes. All active ...
0
votes
0answers
87 views

Pacemaker with Corosync - healthcheck, endpoint monitoring

I have two CentOS VMs with Pacemaker and Corosync configured (with no-quorum-policy=ignore and STONITH enabled). On each machine are 3 application services and Nginx service (webserver). Pacemaker ...
0
votes
1answer
69 views

Need Restart OS Level After change virtual ip on keepalived

I am using keepalived for make HA current maxscale and using virtual IP on keepalived. If I change virtual IP on keepalived I must restart OS on VM or restart keepalived service only? I am still ...
0
votes
1answer
25 views

Network Resilience Design

I am trying to design multi-site network with resilience for the server farm and DMZ for both inbound and outbound resilience. The following resilience that i want to meet at the first place: 1.For ...
0
votes
0answers
21 views

Centos pacemaker configuration option

It is because my ex-colleague just order 3 servers and SAN, he does not determine which HA solution would be used. So, I need to determine the HA solution for my new CentOS Linux servers. And those ...
0
votes
1answer
1k views

psql: could not connect to server: No route to host

I know this is repeated question but I didn't found any solution I want to Set-Up Master-Slave Replication for PostgreSQL 9.6 in Debian 9. But slave server could not connect master . xx.xxx.xxx.205 = ...
0
votes
0answers
64 views

How to use Apache resource by HTTPS in pacemaker?

I have a problem when i change apache url to HTTPS. Before the change every this working fine with http. Now my company need to use the Virtal ip by HTTPS. so that i didn't find any suitable tutorial ...
0
votes
0answers
12 views

policy.yaml file sync across nodes in OpenStack HA deployment

Could anyone guide me on how Openstack policy.yaml files for various services are kept in sync in HA deployment of OpenStack? I parsed thru HA guide on [openstack.org website] (https://docs.openstack....
1
vote
0answers
88 views

Bonding 2 interfaces inside a linux network namespace

I'd like to be able to bond/aggregate 2 interfaces inside a Linux network namespace. The configuration I'm working with is the following: On the root linux net stack I have two physical ethernet ...
5
votes
3answers
640 views

High availability MariaDB only two servers

I'm not worried about split brain since the connection between the two servers is solid (and because I don't have a third machine) I want to have some MariaDB replication with automatic failover so ...
1
vote
1answer
859 views

Which VM Availability Zone is used on Azure if no availability option is selected?

I find the documentation on Azure Availability Zones a bit lacking on details about high availability, so I hope someone here knows these details about some undocumented behaviour. What happens when ...
0
votes
0answers
42 views

Custom High Availability Reverse Proxy with Nginx and Debian Buster

I'm trying to make a custom HA Reverse Proxy for an incredibly simple setup. There are two proxy servers, one of them the main one, other one is the failover. We'll call them proxyA and proxyB, both ...
0
votes
1answer
44 views

HAProxy backend load balancing port being added

I'm trying to use HAProxy to load balance between backend servers, but for some reason the port of the backend server keeps getting inserted. Example: I connect to 192.168.1.1 (over port 80, since I'm ...
0
votes
0answers
25 views

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 ...
1
vote
1answer
31 views

Multipath in linux for 2 replicated storage devices

We are trying to have an HA multipath were from 1 server (linux fedoraOS), we connect to 2 different storage devices (HP3Par) that are syncronously replicated. Our idea is that in case one of them ...
0
votes
1answer
70 views

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/...
1
vote
1answer
30 views

HAProxy not sending health checks to backup servers

In my haproxy.cfg file, I have the following config for the backend backend app balance roundrobin server s1 127.0.0.1:8000 check server s2 135.111.29.95:80 check server b1 ...
0
votes
1answer
1k views

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? ...
1
vote
0answers
39 views

Two Servers in One cluster, Public IPs, and many private subnets. Floating IP with HA?

We are working on a Debian based linux firewall setup, where we are planning to deploy 2 Physical Servers, Node A and Node B. They both would have Public IP address and 1 floating IP. The question ...
1
vote
0answers
22 views

Accessing HA Clusters using multiple floating IPS

I have set up two highly available clusters which are used to load balance traffic to NGINX and MySQL respectively. The clusters use NGINX and ProxySQL as the load balancing software, to make them ...
1
vote
0answers
29 views

Virtual IP is accessible from only one server in High-Availability

I have configured High-Availability setup in the Ubuntu server and I have one virtual IP which going to access both servers, but when I'm trying to access that IP address is only working from only one ...
3
votes
1answer
351 views

Tasks Scheduler Windows High Availability

What is the best way to put in place «tasks scheduler» with high availability under Windows? Currently, the tasks are planned on a single server, which is a problem when the server reboot (for many ...
0
votes
0answers
54 views

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 ...
1
vote
1answer
98 views

DNS and failure tolerance strategies for load balancers

I'm trying to educate myself about how to build a highly available load balancing service for application servers for e.g. HTTP traffic and how they work with DNS servers. Consider the following ...
0
votes
1answer
24 views

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 ...
1
vote
1answer
197 views

ActiveMQ Artemis: Message draining without HA policy “scale-down”

In an ActiveMQ Artemis HA cluster (v2.13.0), the HA policy’s <scale-down/> property causes the backup broker to move all pending messages to one of the remaining live instances if the master ...
1
vote
0answers
25 views

How to configure keepalived, so that choosing master is not static?

I have already managed to configure a setup where I have a master and a backup machine, so when the master fails the backup goes back up. And when the master starts again, it takes the master position ...
3
votes
3answers
754 views

Glusterfs on web server

I want to build a HA Web service and I was planning to use Glusterfs on three nodes (with replica 3). My plan was to install web server directly on Gluster nodes. Is this a viable solution or is there ...
0
votes
1answer
65 views

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 ...

1
2 3 4 5
19