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 ...
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1answer
50 views
Advanced SQL Setup
Got a major issue that I need some help with. Here is the situation.
The client has multiple web sites hosted on multiple web servers (virtual machines) running on multiple virtual hosts that ...
0
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2answers
49 views
Howto switch ISP provider? [duplicate]
Possible Duplicate:
Office network failover?
I have a office LAN providing internet access to several workstations, each workstation it is basically connected to the hub that it is ...
1
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2answers
437 views
How do I do IP Failover for my Public IP address with Linux HA
I did a lot of experiment with heartbeat, corosync and pacemaker for IP FailOver which I have to do with Public IP. I did more than one ip failover(VIPs) with two nodes, also with three nodes BUT ...
2
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1answer
534 views
DNS Failover when Datacenter is dead
I'm just trying to configure my DNS server to switch the DNS entry in my DNS server (bind) if a server becomes unreachable. Is there a simple tool that I can use to do so?
0
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1answer
158 views
mysql/web server failover setup using reverse proxy
I have two webservers and at the moment have DNS - Round Robin setup so that they are somewhat 'failsafe' this was only ever a temporary failover solution and I am now looking at a more permanent and ...
1
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2answers
164 views
Dynamically re-route specific traffic on NIC failure in Linux
This is my first question on this forum. Hope I will be able to help others in the future.
I have two boxes with two NICs each. I know that using bonding I can have some degree of fault tolerance ...
4
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2answers
3k views
How good is failover of the iSCSI target on a two-node linux san?
I'm evaluating the possibility to use two off the shelf servers to build a cheap iSCSI redundant SAN. The idea is to run linux, pacemaker, and an iSCSI target - something like the SAN Active-Passive ...
1
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1answer
168 views
How to connect drive array to redundant motherboards?
How should one connect a small storage array, four 3TB SATA drives for now, to two motherboards or controllers as a failover system? This means avoiding adding another single point of failure such as ...
3
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1answer
944 views
Heartbeat Pacemaker 3 node/ip failover
I have setup two node active/active ip failover with heartbeat and pacemaker following the link at zivtech on the two load balancers for the backend web servers. Two LBs has public ip each which is ...
3
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4answers
917 views
DNS Round Robin: Do browsers stick to one IP as long as it is online?
How do most browsers behave if they get multiple A-records from the DNS server? Do the stick to one IP as long as it is reachable (and only use another if the IP is down)? Or do they switch all the ...
3
votes
3answers
209 views
Two server with same data in case one goes down
I actually own two linux web servers and I was wondering how I could make them work together in case one goes down.
From what I found, cluster seems to be the closest, because it would replicate the ...
0
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1answer
112 views
How to approach high availability and fail-overs when moving to a vmWare cloud server/cluster
I'm currently running a CentOS VPS with some simple web/DB/VPN servers, but I'm planning to move to a vmWare Enterprise cloud based machine in the near future to improve availability, and I need to ...
1
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1answer
369 views
Heartbeat ip failover on Ubuntu
I have 3 servers, 1 as load balancer and 2 as web-servers(apache tomcat) hosting some jsp pages. I want to add one more load balancer in active/passive mode to avoid SPOF and below is the expected ...
1
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3answers
2k views
How to configure ubuntu server with 2 NICs, and 2 Gateways (2nd as a failover)?
Here is a basic overview of the network configuration for one of our servers:
[Datacenter]
[Internet Connection #1] >> [Firewall 1 (xx.xx.xx.1)] >> [Server (xx.xx.xx.10)]
...
1
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1answer
573 views
Tomcat mod_jk cluster skip 404 http status
I am trying Tomcat Clustering with mod_jk for months and so far not so bad but facing a problem during deployment. I am using FarmDeployer to copy and deploy the WAR to other nodes in the cluster but ...
3
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1answer
289 views
Adding the IP Failover on FreeBSD
I've just bought a dedicated server in OVH.com and they are sending me some warnings in email that I haven't configured my IP Failover address correctly and they're going to block this failover within ...
0
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2answers
437 views
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 ...
2
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1answer
298 views
Cisco ASA force failover from command line
I have 2 independent traffic routes to my servers. They are serviced by a failover Cisco ASA5505 pair. However, should my gigabit switch on the main route fail (or main internet feed), the ASA will ...
0
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1answer
293 views
Cisco IP SLA monitor failure on tcpConnect but the host can be telneted from router
I want to configure a failover link to my cache server with Cisco policy routing.
So I attempted to create an ip sla monitor. here is the syntax in the cisco router (there is possibility of being ...
0
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1answer
261 views
How to adjust ASA Failover Times?
I want to adjust my failover poll timing.
The proposed column is what I am wanting to set it up as.
I believe the following commands will obtain what I want from the first two rows but Im not sure ...
0
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2answers
596 views
heartbeat: find out machine's status within a cluster?
I'm trying to do some heartbeat debugging.
Is there a simple way to ask a machine whether it thinks it's part of a cluster, and whether it's the master or the slave?
I've tried
$ heartbeat -s
...
2
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1answer
653 views
heartbeat: Bad nodename in /etc/ha.d//haresources [node1]
I'm trying to start heartbeat on Ubuntu 10.04 with service heartbeat start, but getting the following errors:
heartbeat[24829]: 2011/11/22_19:31:07 ERROR: Bad nodename in /etc/ha.d//haresources ...
0
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1answer
429 views
Heartbeat (without ldirectord etc) for a floating IP address?
I have two load-balancing servers running mod_proxy_balancer. Each server balances between two web servers.
Now I'd like to find a way to share a single IP address between those two load-balancing ...
1
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2answers
488 views
keepalived questions (requirements, abilities, limitations)
1) What are keepalived's (physical/network) requirements? Does the two (or more) keepalived' nodes need to be connected to the same switch? (something related to broadcasting maybe).
2) Can ...
1
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1answer
210 views
Windows Server 2008 R2, IP Failover with 1 server and 2 isp's
I have a Windows Server machine that I have 2 nic's that are connected to 2 different isp's. Our DNS is hosted externally. What I am trying to do is set it up where when one isp goes down the 2nd isp ...
1
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2answers
259 views
SSD redundancy via HDD
Is there a way to guarantee redundancy to an SSD using an HDD?
Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to ...
0
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1answer
158 views
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 ...
0
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2answers
87 views
port check - forward and fail over
I am looking for simple fail-over solution. If the 92 server is down, the application should point to 91 server. I can check the connectivity by scripting the following commands.
[root@sserver ...
1
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0answers
287 views
Kerberos high availability failover, Apache Mod_auth_kerb, Using the Kerberos slave is slow
We host our own Redmine rails web application internally with Apache using Mod_auth_kerb and our internal Kerberos for authentication.
We have 2 internal Kerberos servers KDC1 and KDC2. KDC1 is ...
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votes
2answers
1k views
How browsers handle multiple IPs
Can someone direct me to information on exact browsers behavior when browser gets multiple A records for a given hostname (say ip1 and ip2), and one of them is not accessible.
I interested in EXACT ...
1
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3answers
407 views
Can DNS do failover switch for a domain?
I have heard about round robin solution. But that one is making different request to different ips to do load balancing. What I want is making one IP as master, only if it dies, the DNS server switch ...
0
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2answers
241 views
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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1answer
2k views
How to make iptables ALLOW rule for multicast?
I have two servers that uses ucarp as failover. On each server eth1:1 is reserved for ucarp's keepalive connection.
ucarp uses the destination IP as multicast address 224.0.0.18.
On ucarp master ...
0
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1answer
245 views
Solid failover for IIS and ASP.NET MVC?
Our team is currently planning our next big project which looks to be an exciting one!
We our product will be an ASP.NET MVC site which can either be deployed on a customers own server or they can ...
0
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1answer
227 views
Can the NIC ucarp uses be bridged?
I have setup ucarp failover using this howto, and it works great.
# /etc/network/interfaces
auto eth0
iface eth0 inet static
address 10.200.0.102
netmask 255.255.255.0
...
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2answers
366 views
Virtual IP failover on windows 7
i would like to find out how to set up virtual IP failover on windows 7. There are many online guides on linux heartbeat and pacemaker but i need configuration guides on how to set up virtual IP ...
0
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2answers
735 views
haproxy failover with process monitoring?
I know some people are using keepalived and heartbeat for active/standby but what action is taken if the haproxy process were to die?
What would be nice is if the virtual IP would switch servers if ...
2
votes
1answer
160 views
VPS hosting with IP failover across datacenters
Is there any VPS hosting that would allow IP failover (or remapping) across different datacenters ? The only one I aware of is EC2 with their Elastic IP.
What I'm trying to achieve is to have servers ...
1
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1answer
191 views
Is it a bad idea to use RAID 1 and NBD to create a mirror of a disk for failover?
What I wanted to do is to create a mirror of one machine's disk on a failover machine so that, in the event the primary machine failed, I would just reboot the failover, select a different root ...
1
vote
1answer
280 views
What is needed to use TFTP/PXE with failover ucarp?
I have a Linux TFTP/PXE server which works.
If I setup failover on 192.168.245.1 which is where TFTP is being served, the client fails with tftp open timeout.
I am testing with
tftp 192.168.245.1
...
0
votes
1answer
108 views
Quickly Routing Web Traffic From 1 Web Server to Another
We need a solution to route web traffic from 1 web server to another.
We have 2 dedicated Windows 2008 Servers with our hosting company. 1st server is our main web server and the 2nd is a back-up ...
1
vote
2answers
218 views
SMTP/IMAP failover, filesystem options?
Given two hosts running SMTP and IMAP services, how would you best make them redundant so that one can easily take over if the other goes down?
Keep in mind there are no other servers where network ...
2
votes
2answers
1k views
ASA Active/Standby Failover: Is a standby by IP address needed on inside/outside interfaces?
It would seem that only a standby address that would be needed is for the "failover" interface. This is given with the following command for example:
failover interface ip failover_link 10.99.99.253 ...
2
votes
2answers
174 views
Can BOOTP in DHCP failover to a second IP?
I have a Linux PXE server, and would like to have failover, so in case the primary PXE server is down the secondary PXE server can take over.
The DHCP server is a Windows 2003 R1.
Could failover ...
1
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0answers
119 views
OpenVPN Failover Validation
I've never seen something like this:
I'm using OpenVPN Access Server to validate failover between two servers. When I validate their SSH connecction I get this error:
ERROR: CONNECT_SECONDARY:
...
2
votes
2answers
1k views
Can I point my DNS to nameservers of different web hosts?
I was told that the DNS for my domain is unreliable, so basically I was wondering
Could I set my secondary DNServers that points to another webhost altogether ? :
ns01.host-FOO.com
ns01.host-BAR.com
...
2
votes
3answers
65 views
How can I set up temporary failover for a “write-only” smb share?
I am tasked to set up a storage server which will be used to "receive" data from an Illumina machine running very expensive DNA sequencing operations with limited interruptibility. The sequencer ...
186
votes
25answers
40k views
100% uptime for a web application
We received an interesting "requirement" from a client today.
They want 100% uptime with off-site failover on a web application. From our web application's viewpoint, this isn't an issue. It was ...
3
votes
2answers
162 views
Failover internet access
My company have several remote office connected via a T1 connection. All the remote offices use terminal services to access the servers at the main office. Well, we had a hiccup a couple days ago and ...
1
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1answer
94 views
Does dynamically DNS record updating works as a failover mechanism?
Simple Failover markets itself as:
continuously monitors your servers to find out which are up and which
are down, and then it dynamically updates your DNS records accordingly
so that your ...
