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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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Keepalived send gratuitous ARP periodically

Is there a way for a keepalived to send gratuitous ARP periodically? We had following situation: switch failure (VLAN setup) keepalived failovered to backup instance backup instance sent gratuitous ARP but Cisco ASA device didn't got it (because of…
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Is round-robin DNS a possible solution for high availability?

Let's say I have 2 IPs for a given domain (round-robin DNS). If one the IPs becomes unresponsive, will clients try to connect to the other IP? or they will just fail to establish comunication with the domain?
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Setup for high availability virtualized environment

For a project I have the task of planning a high availability setup for a web shop and CMS system. However, of course the project is on a tight budget. So a high end solution might not be in the budget. There will be two machines running web server…
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High Availability Cron Jobs

Information We are currently in the process of creating a high availability cluster for NGINX (on Centos 7) running PHP. Most of the configuration has been mapped and it should work nicely in a clustered environment. Unfortunately, the only thing…
ctwheels
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Using ZFS head node as database server?

I'm using a dual-head ZFS-backed NAS for high availability cluster shared storage, based on Nexenta's recommended architecture as seen here: The disks in 1 JBOD will store the database files for a single 4 TB Postgres database and the disks in the…
elleciel
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SQL Server - Cluster vs Mirror for high availability?

I have been doing research into various high availability options for SQL Server 2005. With regard to high availability, what circumstances would favor clustering over mirroring as an option? From what I can tell, mirroring has numerous advantages…
Jeremy
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Ganeti vs Proxmox

I'm system administrator in small software house. I'm going to virtualise our servers. The main reason for doing this is providing highest possible uptime, but probably it will also increase resources utilization. We have two servers. On one we have…
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good failover / high availability solutions for linux?

I have several cases where I need applications to be migrated from one server to another in the event of a failure (server hang or crash). On solaris we do this with VCS (Veritas Cluster Server). What options are available for Linux? Please indicate…
ericslaw
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Global high availability setup question

I own and operate visualwebsiteoptimizer.com/. The app provides a code snippet which my customers insert in their websites to track certain metrics. Since the code snippet is external JavaScript (at the top of site code), before showing a customer…
Paras Chopra
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Questions about single point of failure for small operations

If you can't afford or don't need a cluster or spare server waiting to come online in the event of a failure, it seems like you might split the services provided by one beefy server onto two less beefy servers. Thus if Server A goes down, clients…
Boden
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RDS snapshot: how long does I/O suspension occur?

As we're relying on RDS Postgresql manual backup for our backup strategy, we encountered the issue with the possible downtime of the RDS instance (single AZ) during snapshot creation. According to AWS: Creating this DB snapshot on a Single-AZ DB…
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How to setup Traefik for HA? Need a reverse-proxy in front of Traefik?

I am trying to setup Traefik on a production site, and I'm struggling with some high availability issues. I think we still need a reverse-proxy in front of the Traefik cluster. Here are the potential setups that I've considered, and why the…
Mark Grimes
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Shared storage options for ESXi HA cluster

I am seeking recommendations for shared storage options to support ESXi HA cluster (note I'm NOT asking for product/brand/model recommendation - I know this is against the rules here). I am asking for technology recommendation. The company I work…
Arthur
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DNS issue with Failover IP from Hetzner

Assume we have two servers A and B with 'real' and external IPs and we can switch the so called 'failover ip' (W.X.Y.Z) to point to a specific external IP of A or B. This works from the 'outside' and was easily done. As a background: the failover…
Karussell
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OpenVPN timeout to reconnect on fail takes a long time

I'm trying to create a high-availability environment for my OpenVPN servers. I do this by having two identical VPN servers and in my client config specify multiple remote's: # The hostname/IP and port of the server. # You can have multiple remote…
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