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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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MongoDB/ElasticSearch in Kubernetes

I am exploring the Kubernetes toolset and have now my dedicated 3 nodes cluster up and running. Next steps are migrating our company projects to the cluster. As we use MongoDB and ElasticSearch and ...
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0answers
17 views

nginx upstream configuration to switch back and forth between two servers

I've got a legacy web application, it sometimes crashes. Also, it have an application cache residing in the virtual space of the app itself - it can not share the cache data with other instances of ...
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1answer
38 views

How can I configure haproxy to put two frontends to access owa online?

I am facing a problem with HAPROXY on an Ubuntu 16.04 server when redirecting to show OWA on the internet. I have a domain, and I installed exchange server 2013 on windows server 2012 r2. I need to ...
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0answers
11 views

Glusterfs dont mirror supposed mirrored folder

Gluster dont replicate mirrored content: xfce4-terminal -T LocalTerm exit At LocalTerm: PS1='[\u@\h]-[\D{%T}]-[\W] => ' lxc profile copy default default-bkp lxc profile set default raw....
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How to properly set high availability architecture [duplicate]

I am running a PrestaShop 1.6 on a dedicated server with : 128GB RAM and 16c Intel Xeon 3.4(GHz). This server has Web(apache2) and DB (mysql5.5) in the same box for approx. 100 constant users. It is ...
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30 views

VMWare Fault Tolerance vLockStep

I would like to understand how vLockStep is working and could only find very high level description. The current documentation say that disk read but not disk write performed by the primary are ...
7
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4answers
77 views

KVM+DRBD replicated between two active-passive servers with manual switching

I need to build 2-node cluster(-like?) solution in active-passive mode, that is, one server is active while the other is passive (standby) that continuously gets the data replicated from active. KVM-...
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11 views

Drupal HA infrastructure

What is the best way to create a Drupal high availability infrastructure? I'm thinking this infrastructure: 2 frontEnd load balanced: apache/nginx, php-fpm, glusterfs, drupal 3 backend: galera ...
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0answers
21 views

Recovering VCS 2 node cluster in DR?

We are looking for a solution to recover the 2 node VCS Cluster at DR location for a DR Test. Prod: Hardware is Dell with 24 cores 64 GB RAM with Suse 11.4 Linux over SAN Boot & 4 NIC's of 1 Gig. ...
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1answer
23 views

Debian HA cluster with 3 servers, run script on outage for DNS failover

I am currently building a HA cluster, the database is already on Galera, the last thing would be, trigger an DNS update to redirect the traffic to another machine. Is there any software, which can ...
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1answer
46 views

HA Squid with Keepalived

We're trying to setup two HA services: Explicit forwarding proxy using Squid (port 8080) SMTP relay to Office365 using Postfix For both setups we have 2 VM's with a default Debian 7 install, and I'...
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1answer
22 views

IP Failover using Route53

I have 2 Nginx Load balancers, running on AWS, each with an elastic IP address. I want to implement fail-over on them. Can I use Route53 to setup health check, so whenever one server goes down, then ...
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0answers
18 views

Lsyncd triple-master setup

I do use lsyncd in order to sync three nodes with two sync sections in the config of each node. If a node1 fails (unreachable) and new files are being added to node2 or node3, when node1 comes back ...
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1answer
40 views

Windows server fail over clustering between two seperated server [closed]

i have two windows server with speared location,hard and SQL server. how i configure failover between them (IIS and SQL Server)? is there any scenario for this ? is it better to use shared storage ? ...
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0answers
27 views

Implementing a Highly Available backend gateway for a cloud app on AWS

I have 2 EIPs allocated for a cloud app, which are used in round robin DNS. I'd like to have some sort of high availability mode for our 2 gateways (proxies) which are associated with those EIPs, so I ...
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0answers
73 views

DLM and CLVMD not starting on pacemaker redhat HA

I was trying to configure an active-active cluster w/ gfs2, I followed the following instructions: pcs property set no-quorum-policy=freeze pcs resource create dlm ocf:pacemaker:controld op monitor ...
2
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1answer
53 views

High availability mirroring without separate partitions or LVM on Ubuntu 14.04 LTS

I'm on AWS with my clients for a long time now but I'm going to need cut costs now to keep providing my services. On AWS I'm using RSync to keep some folders synchronized and DRDB to provide high ...
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1answer
49 views

Is keepalived + VIP needed for DNS?

I have two dns servers running powerdns, they are using native replication, ie, they are hitting an HA postgres cluster. When creating a new server, I specify the IPs of the two DNS servers in dns-...
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2answers
47 views

nginx reverse proxy for high availability setup?

The scenario is like this, I have a nginx reverse proxy server in front of two app servers which are backups of each other, I want nginx to forward all user requests to the first app server at first, ...
4
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3answers
93 views

Azure high availability solution with synchronization of website and SQL server data

We have a web solution that we sell and it comes with 1 dedicated Azure VM containing everything it requires to run the application: ASP.NET web application Production environment QA environment SQL ...
1
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1answer
17 views

windows 2016 failover cluster

Windows 2016 Failover Cluster with two nodes, both nodes have subnet A and B physical interfaces, and a generic service defined with client access point on both subnet A and B. Can I fail over from ...
0
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1answer
54 views

Configuring Heartbeat to run shell script

I set up a high availability system with Heartbeat, I wish that when there was a drop in the main cluster and the secondary cluster was activated, Heartbeat start in it and execute a shell script. ...
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0answers
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MongoDB replica set not picking a PRIMARY with 4 of 6 members UP

I have 6 instances running on Scaleway , 3 on ARM servers and 3 on Virtual Ubuntu Servers . mongodb1 ARM (mongodb 3.4.9) mongodb2 ARM (mongodb 3.4.9) mongodb3 ARM (mongodb 3.4.9) mongodb4 VPS (...
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0answers
17 views

WordPress High Availability Setup - Feedback needed [duplicate]

So I got the lucky job to setup a High Availability WordPress Setup to serve around 100k views per Day. I started to create a server diagram and would like to hear your feedback for improvements. ...
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1answer
192 views

bond slave interfaces not getting the same aggregator id on LACP

I have a bug on some servers where LACP (802.3ad) is not working. I have on all servers a bonding device bond0 with two eth slaves and each interface is plugged on a different swich, and both switches ...
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0answers
67 views

How to set up tcp check with keepalived?

Trying to set up HA bastion servers. Failover, load balancing is not needed. Two servers running debian. bastion01 and bastion02. 192.168.0.10 and 192.168.0.11. Floating IP is 192.168.0.12. I started ...
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0answers
34 views

Zabbix agent multipath?

I have some VMs where Zabbix agents are used to gather metrics. Since these VMs are on several different physical hosts it would only be very natural to run a Zabbix proxy on each of these hosts and ...
2
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1answer
174 views

Informix HDR failover doesn't work when primary DB server and ICM are terminated simultaneously

Automatic switchover is configured in a primary/secondary HDR server setup. The HDR cluster would be connected and replication is on. If the service is stopped gracefully on the primary server (NODE-...
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2answers
73 views

Site-aware cluster migrates VMs to random nodes, not to the preffered site

We have 2 physical host, 4 virtual-node (HyperV Server VMs, 2 on each host) cluster which is running some nested test VMs (using mentioned HyperV Server). In short it is ment as a lab environment ...
0
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1answer
44 views

DB2 10.5 HADR read only standby applications don't reconnect to primary

Scenario: server SERV_A, database DBNAME primary server SERV_B, database DBNAME standby with DB2_HADR_ROS enabled Then this situation occurs: connection CON is made from client to DBNAME when ...
1
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1answer
129 views

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:...
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1answer
278 views

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 ...
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154 views

How to achieve IIS High Availability with NLB and ARR (Active/Active)?

I've been able to mostly implement this myself in a dev environment. However, I have run into a few key issues that I have questions about: 1) With multiple active/active ARR nodes for high ...
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1answer
1k views

vSphere 6.5 HA agent cannot be correctly installed or configured

Last week we encounter the following issue : we had to shutdown our entire infrastructure due to UPS replacement. At the end of electrical operations we had restarted : network SANs vCenter ESXis (2 ...
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0answers
123 views

Monitor active/passive pacemaker service with icinga2

I've got a clustered service (active/passive pacemaker cluster) that I'd like to monitor with icinga2. According to the documentation (https://www.icinga.com/docs/icinga2/latest/doc/08-advanced-topics/...
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20 views

High performance, high availability backend configuration [duplicate]

We have a mobile app project which at this moment gets very low traffic (few server hits per day) but due to potential cooperation with a big company we might soon start serving as much as 500.000 ...
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0answers
180 views

Connection reset by peer when running Apache Benchmark

I have setup a docker swarm that has nodes running in it containing node.js apps. Currently when I try to run stress testing with ab tool I get error. Error happens when I try 1000 concurrent requests....
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2answers
77 views

High Availability on DAS HPE

Anyone who can assist me? I currently have a DL360 Gen9 HPE server Directly attached to HPE MSA 2040 device (DAS). I now need to ensure HA on the server level, is it possible to have FO cluster (...
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0answers
272 views

Apache Failed to Start in Pacemaker

I am using Pacemaker with Corosync to set up a basic Apache HA cluster with 3 nodes running CentOS. For some reasons, I cannot get the apache resource started in pcs. Cluster IP: 192.168.200.40 # ...
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0answers
373 views

How to health check Squid server with ELB?

I wanted to have an HA forward proxy solution using Squid, and I am trying to use the Squid servers behind ELB solution on page 41. However, my forward proxy service is a service meant to forwarding ...
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0answers
24 views

Keepalived Gratuitos ARP

Is there any way in keepalived v1.4.4 to stop sending Gratuitous ARP for specific instance? I need that because upstream L2 ISP is forbidding us to send such frames. I tried with this config: ...
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0answers
20 views

Frequent switch of floating IP(VIP) on red hat servers

I am implementing a High availability architecture on 2 red hat servers using ucarp. The problem is floating IP (VIP) is swapping each 10 minutes. Red hat servers are implemented on VMware. I can ping ...
6
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1answer
360 views

2 node cluster (active-passive) with Windows Server 2016

I'd like to create a 2 node cluster with 2 servers with Windows Server 2016 standard. My cluster should be in active-passive configuration without shared storage (SAN, iSCSI, etc.) without active ...
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0answers
44 views

AWS Elastic IPV6

I posted a question some time ago about an AWS Elastic ipv6 (AWS CLI Elastic IP, IPv6) Basically i need to be able to change the ipv6 from one instance to another like an elastic ip. (Instances in ...
0
votes
1answer
31 views

Centos 7 HA firewall/router systemctl ospfd

I'm trying to create an HA firewall/router pair using keepalived (VRRP only), conntrackd, and OSFP under quagga, all installed as the standard Centos & packages. This is similar to the setup ...
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1answer
40 views

How to sync azure SDD disk across datacenters?

I'm working on a failover plan for my (at the moment, single Azure region) webservers. My azure resources are due to legacy applications quite oldschool, Windows server 2016 VM's with SSD disks ...
2
votes
1answer
406 views

Corosync HA preventing split-brain scenario

I'm setting up a test system for self-teaching about load balancing and high availability and I'm curious about a configuration setting in Corosync and would like to know what you guys who have ...
5
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1answer
564 views

OpenVPN HA Setup on AWS

We are using Paid version of OpenVPN on AWS. Now we want to setup HA but we could not find any proper solution for OpenVPN HA on AWS. Tried OpenVPN document but it doesn't meet the requirement of HA ...
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0answers
34 views

How to achieve HA in open nebula?

I have just setup an open nebula environment for testing purpose and once everything will work well, will implement in production environment. But I have a doubt and not able to understand the HA ...
2
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0answers
30 views

Hardware Planning for Open Nebula

How do you plan Hardware allocation in terms of Physical servers to achieve a 100% or close HA. A 1 to 1 Pairing of Server Hardware using Heart Beat Corosync looks expensive. Is there a better way?