Questions tagged [failover]
In computing, failover is automatic switching to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active application, server, system, or network. Failover and switchover are essentially the same operation, except that failover is automatic and usually operates without warning, while switchover requires human intervention.
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Azure Table Storage mirroring
I am proposing an Azure environment with the following:
VM SQL Server for core relational data
Table Storage for bulk data
I want to mirror the SQL Server database to another server so that
Reports ...
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Simple failover: Use NAT? (Network Address Translation)
We have a Windows Server 2008 server which needs very high uptime. We want failover in the event we need to take it offline for some reason, ex: hardware update, software update, etc.
It runs mostly ...
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How to setup a failover solution for Windows 2003 SMTP Server?
I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
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Nginx reverse proxy: How to serve 'back soon' html file while backend server restarts
I have a WSGI server behind by nginx. Say I bring the WSGI instance down for maintenance/update, is there a nice way of nginx automatically serving up any requests to that application with a specified ...
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Software load balancing fail-over vs hardware [closed]
Please correct me, but my understanding is that with software load balancing a service must be run on each server while there is one DS that notifies the other servers that a server has gone down and ...
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hosted failover(proxy?) service - does it exist?
We're in the planning phase to make our web application services redundant. Right now we've got our own physical servers at a colo, running a VMWare cluster connected to an EqualLogic SAN. It's a LAMP ...
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Website caching failover service [closed]
A while back I remember reading about a service that provided failover support for websites. I never got around to reading specifics and now I can't remember the name of the service. Does anyone have ...
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redirect to a static page on another web server when main web server is down
We have a single IIS web server in house that when it goes down we would like to redirect traffic to another web server and display a message that the web site is down. I have been all over the net ...
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Will traffic get through a standby firewall if the active firewall's interface to the gateway goes down?
Here is the scenario. I have two ASA 5510's in Active/Standby. Each of them has a single uplink to one of two routers (HSRP1 and HSRP2) configured in HSRP. Disaster strikes and the interface ...
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How to use AppScale
There are some wiki which explain how to install and setup AppScale.
But I didn't find anything related to the extensive use of AppScale. I mean, what to do in case of major outage ?
If the node ...
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WAN Link Balancing - Best Way To Approach
First some of the details. We are a SME (80 office users 30 remote) with 2, soon to be 3 WAN connections. Our WAN connections are a T1, Cable (25/5), and soon to be DSL (10,2). We are looking to to ...
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Feasibility of a Cloned Windows Server 2008 as a Cold Standby
For various reasons beyond our control, a critical service running on a particular machine must communicate to another machine via a preset and fixed IP address.
Both machines run Windows Server 2008 ...
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Redundancy with DNS records
The firm that I work for has 2 ADSL lines into the office. We have a domain office.ourfirm.com which we would like to be able to reach our network server on. One of ADSL connections is already a DNS ...
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Domain Name with Secondary server In case of failover
I have 2 webservers one principal webserver and a secondary webserver located in two different buildings.
I need to know if it's possible to point www.example.com to the principal webserver and in ...
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ISC DHCP Failover for more than two servers?
Is there some method to have multiple ISC dhcp servers on different subnets and only one backup (failover) server for all of them? How can in accomplish this task?
thank you in advance
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Cisco ASA failover with single connection
I would like to setup two Cisco ASA firewalls in a failover configuration. However, my ISP gives me a single address and ethernet port on their CPE device. I am assuming that I would then need to ...
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Failover/Load balancer for WHM/cPanel [closed]
I have a simple question for which I have not been able to find a simple answer. Here's the scenario:
Server 1: WHM/cPanel with multiple accounts/dbs
Server 2: WHM/cPanel with multiple accounts/dbs ...
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How to replicate apache mod_jk session data
is it possible to replicate the mod_jk sticky session information to another apache for an failover setup?
the idea behind the question is to setup two apaches with sticky sessions in front off some ...
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Send Email on failover in Sql Server 2005
I have two instances of Sql Server 2005 running two copies of a database in a Principal and Mirror configuration.
I want to send an email to someone whenever there is a failover, by which I mean the ...
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1 Storage with 1 "big" partition + 2 servers
I need to setup an "cold fail over" to our database server.
Since we cannot run an real HA because an software issue, I'm planning to connect 2 server to a single storage. If main server fails, I just ...
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Configuring ethernet port failover in Windows 2008
I have a Dell R300 server with two ethernet ports, running Windows Server 2008. I'd like to use one IP address, and connect to two switches. I only need one port at a time, I don't need more speed. ...
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Can you recommend a failover solution for setups running multiple VPSes?
Here's what I have to work with:
Root access to VPSes with different hosting companies that run CentOS only
Two dedicated nameservers with over 100 zone entries
Several webservers hosting the same ...
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How to replicate a windows servers (IIS,Files,ConfigurationState)?
Maybe a better question is: What is the closest competitor for DoubleTake? I am looking to replicate a windows production server in case it fails have a immediate backup. Any idead?
NOTE 1: I forget ...
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Cisco 2801 as a fail over?
I have recently acquired a Cisco 2801 unit and I want to know if it is capable of acting as a fail over for a network. It currently has an ADSL WIC installed.
We currently run 6 Windows servers (4x ...
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How does NGINX Plus handle server failure when doing session persistence for TCP/UDP communication?
My understanding from the NGINX Plus documentation is that their Load Balancing will route around servers that are down or swamped and that Session Persistence attempts to maintain the same server for ...
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Unable to access web service with floating IP address assigned to my machine
I have a machine for which I have assigned a floating IP address. That machine is also my load balancer. I can access my service easily using the IP address of load balancer.
However I am unable to ...
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Servers Redundancy/Fail over in different locations
One in a different city. These are individual servers, pretty much works as file servers. We upload images to those servers and at the end of the month we send the images to our clients (...
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Failover cluster of 2+ servers for disasters with only 2+ physical machines
TL;DR: Question in bold below
Here http://www.howto-expert.com/how-to-create-a-server-failover-solution/ is an (I assume) old blog post, explaining how to setup 2 server machines (one master and one ...
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Failover Cluster waits till the Site to Site DNS Replication done
I created a failover cluster with 2 subnets in AWS VPC.
In one subnet I have DC1 (10.30.10.101) and Node 01 (10.30.10.102).
In other subnet, I have DC2 (10.30.12.101)and Node 02 (10.30.12.102)....
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Windows 2012 AD user failover to AWS Windows AD
We're having a bit of an issue with our local Windows AD not failing over to our AWS hosted AD.
We have web portals for our support staff to log into with AD credentials. When our on-premise AD "...
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haproxy backup / failover for servers one by one
i run haproxy 1.6 in our environment for different applications. Former we used a Cisco product. Haproxy has a lot of advantages but there is one thing i could not configure with haproxy or i do not ...
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Using OVH/SYS failover IP as server's main IP
Good morning
my server is a dedicated from SoYouStart. I purchased 8 failover IP.
OS is Centos 7.4 + CloudLinux. The machine will run a cPanel box.
What I need is associate the cPanel and ...
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How much disk space does a test failover VM from a HyperV replica use?
We have a replica of our Exchange server running on Hyper-V. This replica creates a checkpoint every hour and keeps these checkpoints for 24 hours.
We would like to use the "test failover" option to ...
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Automatically migrate an openstack instance on node failure
I'm wondering if there is an option on modern nova (Beyond newton) allowing me to automatically failover an instances that is hosted on a failed node?
I know that the purpose of the cloud is to ...
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architecture for no fail request with keepalived
I have a local cluster of 3 CentOs servers, I've installed Keepalived on each server, Then I run some benchmark tests with ab like this :
ab -c 1000 -n 100000 -r host
Then in the middle of benchmark ...
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The computer object associated with the resource could not be updated in domain
After a few hours of unsuccessfull Googling and scouring all over the Internet, I have to go back to my good old friend at StackExchange. My problem is associated with a dissfuctional Microsoft ...
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time based (scheduled) haproxy backend backup setting
I have 2 web servers: A and B with haproxy before them. I'd like to use A as a master and B as a backup/failover server.
I'd like to know whether it is possible to have:
no automatic switch to B in ...
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Web Server failover solution [closed]
Sorry for a dumb question but I`m a green hand yet.
I have two Linux server: one of it is running Apache with MySQL to serve my web-platform (master server) another one is supposed to be a sort of ...
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Negotitate VRRP on a private link between routers (Possible?)
I have a topology similar to this one:
R1 and R2 are two physical machines acting as routers. (Running some linux distro with Keepalived)
R1 and R2 are connected to one another with a private link.
...
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What is the best way to sync 2 identical centos servers in real time
I am operating a centos linux server(A) and I want to create a realtime backup server(B) so whenever server A goes down server B(after the failover kicks in) will take over.
I already solved the ...
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pacemaker failover nginx only once
I setup a cluster with two nodes with pacemaker 1.1.10 on CentOS 7.
Then I downloaded a resource agent for nginx from github
I tested my setup like this:
Node 1 is started with the nginx and vip, ...
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Proxmox Virtualized Client (Network Configuration)
first some information about me. I ordered a server from ovh and purchased one failover ip to test proxmox and do some training.
The main Server is hosting proxmox(Example IP: 123.45.67.89 to figure ...
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How to configure NIC teaming on free VMWare ESXi 5.5?
There are articles online that describe this process for paid version of ESXi via VDS. My understanding is that VDS is not available on free ESXi version. We, however, do not need fully blown HA on ...
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Replacing 1GBe with 10GBe NIC Failover Cluster Host
We have a 3-node Failover Cluster - all currently running 4 Port 1GBe NIC Cards. We intend to upgrade these NICs to 2x 10GBe + 2x 1GBe NIC cards which have the following configuration:
Ports 1 -- ...
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OS X server Open Directory fail over successfully but not the user home directories
We setup the OS X server Open Directory(OD) master and replica. Users are created on master and their home directories are on the master server. When the master OD server is down, the OD client (MAC) ...
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Hadoop: How to configure failover time for a datanode
I need to re-replicate blocks on my HDFS cluster in case of a datanode is failing. Actually, this appears to already happen after a period of maybe 10min. However, I want to decrease this time, but ...
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How do I bond eth0 to failover to wlan0 after WAN connection loss?
I would like to have my monitoring box (Zenoss) notify me when the network upstream of me goes down without an actual link loss.
I have had some issues with our CoLo's switches going down, but I don'...
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Restart failed processes on available machine
I'm working on a system that has about 50 processes distributed across about 4 different machines. The architecture allows for any process to run on any machine, but only allows each process to run on ...
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Keepalived loses VIP upon power cycle of master
I have two servers running Keepalived 1.2.7 with hostnames left and right. Here are the configs:
# keepalived.conf on left
vrrp_instance VI_1 {
state MASTER
interface eth1
...
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Redirect PowerDNS on Failure
I've been searching around, but cannot seem to find an answer so I apologize if this has been asked here before.
I had two PowerDNS servers - ns1 and ns2 (which are in different datacenters). Both ...