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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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Failover Nginx reverse proxy

I am looking to setup my Nginx reverse proxy to handle a server failure or Nginx failing for some reason or another. I know how to configure nginx to work as a load balancer/ reverse proxy for other ...
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2answers
45 views

How to get DRBD to automatically start after reboot, mount volume, start service, and configure primary/secondary

I have a great working version of DRBD across two Debian Stretch servers which I created by following this awesome guide: https://www.howtoforge.com/setting-up-network-raid1-with-drbd-on-debian-...
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19 views

Multiple apache reverse proxies behind 1 external IP

I have honestly tried searching on this topic, but I keep landing on articles explaining how to load balance web servers behind proxies, which is not what I want to do. My setup is like this: WWW -...
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6 views

Solr cluster die if a node fails while is importing data

We've a cluster made by Solr nodes that are connected with three zookeper nodes like this: Solr Cluster All Solr nodes are NRT and have a copy of all data (the collections shards are replicated on ...
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1answer
32 views

Creating a VSAN datastore

I am trying to set up my first HA cluster and I have some hard time digging into VSAN datastores. I have two ESXi hosts both with two 480 SSD hard drives in RAID 1 Can I add the existing hosts' ...
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22 views

Is it possible to migrate bare-metal ovirt host+engine to self-hosted without full cluster rebuild?

I have ovirt cluster of 2 CentOS hosts. Host1: host for regular VMs + bare-metal ovirt-engine Host2: host for regular VMs They have shared NFS storage. Is it possible to migrate to self-hosted system ...
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11 views

Create a reliable architecture to avoid downtime

Today I have several droplets (VPS) on DigitalOcean for single tasks, one VPS for each task: Apache / PHP PostgreSQL NodeJS ElasticSearch Exim Unfortunately these days one of these droplets went ...
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1answer
35 views

Advice for high availability

Talking about high availability im in search of advice for my particular situation. We have configured a blade center from ibm our active directory server using vmware (windows server 2008 r2), and ...
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1answer
92 views

Redis: read-only slave vs fail-over slave?

I'm reading a lot of documentation around Redis network configurations, and I'm confused about how it seems the requirements in the architecture mental model I had, don't seem to map with the current ...
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32 views

cman cluser nodes cannot read/write files written by each other

I have a cman cluster where nodes cannot read/write files written by each other. Node 1: [user1@server1~]$ ls -l /path_to_sharedvol/ total 4 -rw-r--r-- 1 user1 user1 26 Oct 18 05:38 common-file Node ...
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1answer
41 views

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
32 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
86 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
22 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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15 views

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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41 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 ...
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5answers
171 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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0answers
22 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
33 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
91 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'...
2
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1answer
24 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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34 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
41 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 ? ...
2
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1answer
41 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
193 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 ...
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1answer
72 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
59 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
94 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, ...
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3answers
102 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 ...
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1answer
19 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 ...
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1answer
114 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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33 views

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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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
397 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
135 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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53 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 ...
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2answers
313 views

Informix HDR failover doesn't work when primary DB server and Connection Manager/ICM are terminated simultaneously then ICM is brought back online

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
74 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 ...
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1answer
57 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 ...
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1answer
234 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:...
1
vote
1answer
464 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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0answers
226 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
3k 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
128 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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0answers
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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234 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
91 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
439 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
531 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
32 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: ...