Re: haproxy and multi location failover
2011/11/1 Senthil Naidu senthil.na...@gmail.com: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Unless you have your own routing, if you want no downtime for nobody you have to imagine a more complex scenario. Has said below the only way to switch for a datacenter to an other is to use dns. So you have to find a solution for waiting dns propagation to be complete. I'll do something like : 1) if lb1 fail - change dns - srv1-1 become a lb for himself and srv2-1 2) if srv1-1 and srv2-1 fail - change dns - ld1 forward requests for lb2 (maybe slow but better than nothing). and so one ... Joris Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
RE: haproxy and multi location failover
We use www.dnsmadeeasy.com (unsolicited plug) to do automatic DNS failover that Joris is describing. It works well for us. My colleague and I theorized another option would be to run your HAProxy instances as Amazon EC2 instances (one each in different availability zones) with an elastic IP. That way you'd be taking advantage of Amazon's routing network without having to build your own. Like I said, that's only been theorized. I haven't actually done that. --- David Prothero I.T. Director Pharmacist's Letter / Prescriber's Letter Natural Medicines Comprehensive Database Ident-A-Drug / www.therapeuticresearch.com (209) 472-2240 x231 (209) 472-2249 (fax) -Original Message- From: joris dedieu [mailto:joris.ded...@gmail.com] Sent: Thursday, November 03, 2011 1:19 AM To: haproxy@formilux.org Subject: Re: haproxy and multi location failover 2011/11/1 Senthil Naidu senthil.na...@gmail.com: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Unless you have your own routing, if you want no downtime for nobody you have to imagine a more complex scenario. Has said below the only way to switch for a datacenter to an other is to use dns. So you have to find a solution for waiting dns propagation to be complete. I'll do something like : 1) if lb1 fail - change dns - srv1-1 become a lb for himself and srv2-1 2) if srv1-1 and srv2-1 fail - change dns - ld1 forward requests for lb2 (maybe slow but better than nothing). and so one ... Joris Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
haproxy and multi location failover
Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
There is not (yet) a GSLB or dyndns daemon available in opensource, but a few DNS server could be used to emulate this feature. - PowerDNS + pipe backend - unbound + python module or yourself updating your DNS server to trigger a failover Cheers On Tue, Nov 1, 2011 at 6:10 PM, Senthil Naidu senthil.na...@gmail.com wrote: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
DNS propagation can take a long time based on my experience. We have a similar problem where we host multiple identical setups in different EC2 availability zones. We have been thinking of having DNS entry with multiple A records for load distribution and failover. However, that doesn't solve the problem of OP. Vivek Sent via BlackBerry from T-Mobile -Original Message- From: Baptiste bed...@gmail.com Date: Tue, 1 Nov 2011 18:17:25 To: Senthil Naidusenthil.na...@gmail.com Cc: Gene Jgh5...@gmail.com; haproxy@formilux.orghaproxy@formilux.org Subject: Re: haproxy and multi location failover There is not (yet) a GSLB or dyndns daemon available in opensource, but a few DNS server could be used to emulate this feature. - PowerDNS + pipe backend - unbound + python module or yourself updating your DNS server to trigger a failover Cheers On Tue, Nov 1, 2011 at 6:10 PM, Senthil Naidu senthil.na...@gmail.com wrote: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
True :) Despite short TTLs, some client would take a long time to failover. But it's the only option unless you own your AS and you are able to route your traffic inside it. rgs On Tue, Nov 1, 2011 at 6:30 PM, vivek.ma...@gmail.com wrote: DNS propagation can take a long time based on my experience. We have a similar problem where we host multiple identical setups in different EC2 availability zones. We have been thinking of having DNS entry with multiple A records for load distribution and failover. However, that doesn't solve the problem of OP. Vivek Sent via BlackBerry from T-Mobile -Original Message- From: Baptiste bed...@gmail.com Date: Tue, 1 Nov 2011 18:17:25 To: Senthil Naidusenthil.na...@gmail.com Cc: Gene Jgh5...@gmail.com; haproxy@formilux.orghaproxy@formilux.org Subject: Re: haproxy and multi location failover There is not (yet) a GSLB or dyndns daemon available in opensource, but a few DNS server could be used to emulate this feature. - PowerDNS + pipe backend - unbound + python module or yourself updating your DNS server to trigger a failover Cheers On Tue, Nov 1, 2011 at 6:10 PM, Senthil Naidu senthil.na...@gmail.com wrote: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
May I ask what some of the acronyms in this email thread stand for RHI - AS - GSLB - Thanks, Vivek On Tue, Nov 1, 2011 at 2:26 PM, Baptiste bed...@gmail.com wrote: True :) Despite short TTLs, some client would take a long time to failover. But it's the only option unless you own your AS and you are able to route your traffic inside it. rgs On Tue, Nov 1, 2011 at 6:30 PM, vivek.ma...@gmail.com wrote: DNS propagation can take a long time based on my experience. We have a similar problem where we host multiple identical setups in different EC2 availability zones. We have been thinking of having DNS entry with multiple A records for load distribution and failover. However, that doesn't solve the problem of OP. Vivek Sent via BlackBerry from T-Mobile -Original Message- From: Baptiste bed...@gmail.com Date: Tue, 1 Nov 2011 18:17:25 To: Senthil Naidusenthil.na...@gmail.com Cc: Gene Jgh5...@gmail.com; haproxy@formilux.orghaproxy@formilux.org Subject: Re: haproxy and multi location failover There is not (yet) a GSLB or dyndns daemon available in opensource, but a few DNS server could be used to emulate this feature. - PowerDNS + pipe backend - unbound + python module or yourself updating your DNS server to trigger a failover Cheers On Tue, Nov 1, 2011 at 6:10 PM, Senthil Naidu senthil.na...@gmail.com wrote: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
Re: haproxy and multi location failover
RHI: Route Health Injection AS: Autonomous System = RHI relies on your AS to route traffic to the right POP (Point Of Presence) Pro: compatible with anybody speaking BGP or OSPF, failover quickly Cons: require an AS, so not compatible with public clouds :) GSLB: (geo|global) Server Load Balancing = relies on DNS, depending on the status of the POP (cf above). Pro: easy to configure Cons: no standard, must rely on the same LB vendor for each POP, quite expensive, can take some time to failover cheers On Tue, Nov 1, 2011 at 7:29 PM, Vivek Malik vivek.ma...@gmail.com wrote: May I ask what some of the acronyms in this email thread stand for RHI - AS - GSLB - Thanks, Vivek On Tue, Nov 1, 2011 at 2:26 PM, Baptiste bed...@gmail.com wrote: True :) Despite short TTLs, some client would take a long time to failover. But it's the only option unless you own your AS and you are able to route your traffic inside it. rgs On Tue, Nov 1, 2011 at 6:30 PM, vivek.ma...@gmail.com wrote: DNS propagation can take a long time based on my experience. We have a similar problem where we host multiple identical setups in different EC2 availability zones. We have been thinking of having DNS entry with multiple A records for load distribution and failover. However, that doesn't solve the problem of OP. Vivek Sent via BlackBerry from T-Mobile -Original Message- From: Baptiste bed...@gmail.com Date: Tue, 1 Nov 2011 18:17:25 To: Senthil Naidusenthil.na...@gmail.com Cc: Gene Jgh5...@gmail.com; haproxy@formilux.orghaproxy@formilux.org Subject: Re: haproxy and multi location failover There is not (yet) a GSLB or dyndns daemon available in opensource, but a few DNS server could be used to emulate this feature. - PowerDNS + pipe backend - unbound + python module or yourself updating your DNS server to trigger a failover Cheers On Tue, Nov 1, 2011 at 6:10 PM, Senthil Naidu senthil.na...@gmail.com wrote: hi, we need to have a setup as follows site 1 site 2 LB (ip 1) LB (ip 2) | | | | srv1 srv2 srv1 srv2 site 1 is primary and site 2 is backup in case of site 1 LB's failure or failure of all the servers in site1 the website should work from backup location servers. Regards On Tue, Nov 1, 2011 at 10:31 PM, Gene J gh5...@gmail.com wrote: Please provide more detail about what you are hosting and what you want to achieve with multiple sites. -Eugene On Nov 1, 2011, at 9:58, Senthil Naidu senthil.na...@gmail.com wrote: Hi, thanks for the reply, if the same needs to be done with dns do we need any external dns services our we can use our own ns1 and ns2 for the same. Regards On Tue, Nov 1, 2011 at 9:06 PM, Baptiste bed...@gmail.com wrote: Hi, Do you want to failover the Frontend or the Backend? If this is the frontend, you can do it through DNS or RHI (but you need your own AS). If this is the backend, you have nothing to do: adding your servers in the conf in a separated backend, using some ACL to take failover decision and you're done. cheers On Tue, Nov 1, 2011 at 2:25 PM, Senthil Naidu senthil.na...@gmail.com wrote: Hi, Is it possible to use haproxy in a active/passive failover scenario between multiple datacenters. Regards
