After discussion with my colleagues questions about initial configuration of the open network redundant routers and the applicability of the existing bash scripts (cloud-early-config) to the setup of VPC redundant routers have generated.
Some setup first: In the bash script cloud-early-config there is a function named setup_redundant_router which makes copies of several template files. The template files are used to configure keepalived and conntrackd. The template copies are edited, via sed editor, using environment variables ($ROUTER_PR, $ETH0_IP,$NAME, etc.) which are obtained from the kernel of the current running linux image using the virtual file system /proc/cmdline. I'm sure keepalived and conntrackd can be used for starting and control of VPC redundant routers. However the setup of keepalived and conntrackd for VPC needs setup parameters which are dynamic because a VPC can have N number of redundant router pairs, not just the fixed number parsed from proc/cmdline in the running kernel. Am I correct in this analysis? If so, given the dynamic nature of the VPC redundant router configurations: Is using a setup_VPC_redundant_router bash function, similar to the existing open network function mentioned above, the most appropriate way to setup the keepalived or conntrackd configuration files for VPC redundant routers in the cloud-early-script? It seems to me reading the parameters from the kernel will require a unwieldy set of kernels to match the N private network redundant router pairs configured by the enduser. Comments, questions, clarifications? Karl In the bash script ea On Mon, Jan 27, 2014 at 11:25 AM, Daan Hoogland <daan.hoogl...@gmail.com> wrote: > good reason to skip it for a next version, let's look into it anyway, > as we don't want to burn any of our ships. > > On Mon, Jan 27, 2014 at 4:53 PM, Karl Harris <karl.har...@sungard.com> wrote: >> All, >> >> At first redundant DHCP seemed like a good idea. I did some cursory >> research and the more I read the more I'm convinced it may be >> more trouble than its worth for the first implementation. I'll talk >> with some of our Systems Engineer's here and get a broader >> perspective. >> >> There seems to be only a single implementation of an open source DHCP >> server that will handle the synchronization required for redundant >> servers. >> >> Karl >> >> >> On Fri, Jan 24, 2014 at 5:47 PM, Daan Hoogland <daan.hoogl...@gmail.com> >> wrote: >>> Saurav, >>> >>> Not sure how this happens now, but it is definateluy something we >>> want. For the static conf files it won't be much of a problem. The >>> firewall/loadbalences won't be much of a problem, they are fire and >>> forget configurations of the ms that can just be sent to both. The >>> dhcp is a challange. I am not sure if it is solved for the plain rvr >>> now but it should be solved for that as well. >>> >>> On Fri, Jan 24, 2014 at 3:53 PM, Saurav Lahiri >>> <saurav.lah...@sungard.com> wrote: >>>> Daan, >>>> I was wondering if you had not shared your thoughts, but looks like I had >>>> missed your mail. >>>> >>>> I agree that redundant dhcp or dns would be good to have. What I meant was, >>>> it appears that by just enabling RVR there is no way to auto sync >>>> configuration between the master and slave nodes with regard to dhcp, >>>> loadbalancer and firewall(specifically the dhcp lease file, haproxy,cfg and >>>> iptables configuration). So just enabling RVR does not ensure high >>>> availability for these services. Is there a way cloudstack autosyncs >>>> configuration? >>>> >>>> For the routing portion this is not an issue as the participating routers >>>> learn the route through known protocols. >>>> >>>> Thanks >>>> Saurav >>>> >>>> >>>> On Fri, Jan 17, 2014 at 2:37 AM, Daan Hoogland >>>> <daan.hoogl...@gmail.com>wrote: >>>> >>>>> Saurav, I don't see why you can't benefit from having other services >>>>> redundant as well. Vpn might be a problem as the source ip of a >>>>> redundant router pair on a vpn might give a problem (maybe there is an >>>>> implementation) but why wouldn't you want redundant dhcp or dns >>>>> services? As I understand it these are used at Schuberg Philis at the >>>>> moment. will double check when I get a chance. >>>>> >>>>> regards, >>>>> Daan >>>>> >>>>> >>>>> >>>>> On Thu, Jan 16, 2014 at 1:33 PM, Saurav Lahiri >>>>> <saurav.lah...@sungard.com> wrote: >>>>> > Daan, >>>>> > So looking at what is available today for guest network, the Redundant >>>>> > VR >>>>> > can be enabled only for the source nat service. I guess the mention of >>>>> the >>>>> > source nat router is in relation to that. I could be wrong though. It >>>>> > appears that the other services like vpn, dhcp, dns do not benefit much >>>>> > from the RVR capability. Can you clarify if thats correct? >>>>> > >>>>> > Thanks >>>>> > Saurav >>>>> > >>>>> > >>>>> > On Thu, Jan 16, 2014 at 2:27 AM, Karl Harris <karl.har...@sungard.com >>>>> >wrote: >>>>> > >>>>> >> ---------- Forwarded message ---------- >>>>> >> From: Daan Hoogland <daan.hoogl...@gmail.com> >>>>> >> Date: Wed, Jan 15, 2014 at 2:51 PM >>>>> >> Subject: Re: rvr4vpc >>>>> >> To: Karl Harris <karl.har...@sungard.com> >>>>> >> Cc: Christopher Litsinger <christopher.litsi...@sungard.com> >>>>> >> >>>>> >> >>>>> >> H Karl, >>>>> >> >>>>> >> Thanks for sharing. I didn't want to initiate this but I encourage you >>>>> >> to share this on the dev list (not in jira) as things are only >>>>> >> considered 'discussed' if they passed by there. >>>>> >> >>>>> >> You speak of '1 Get configuration data on Source Nat Router', I don't >>>>> >> understand why you call the router by this designation. 'Source Nat' >>>>> >> is only one of it's many possible functions. >>>>> >> >>>>> >> Apart from the design principles I shared with you I have so far only >>>>> >> a technical implementation detail so far. That is to reserve the >>>>> >> (eth2) interface for the private gateway on the vpc (r)vr. This way >>>>> >> the inteface to configure are somewhat predictable. >>>>> >> >>>>> >> As for the design principle to have a statefull router (reboot proof) >>>>> >> the idea is to implement a configuration file that will be uploaded to >>>>> >> the router after which a self-config command is send that will >>>>> >> implement the details of configuring the interfaces, haproxy and >>>>> >> keepalived and maybe more. I think your current assessment of the >>>>> >> working of the RVRs is accurate but it will not be workable for an >>>>> >> implementation for vpc's as they have an unpreditable number of >>>>> >> interfaces. >>>>> >> >>>>> >> to bad you can't make it next thursday, >>>>> >> Daan Hoogland >>>>> >> >>>>> >> >>>>> >> On Wed, Jan 15, 2014 at 3:25 PM, Karl Harris <karl.har...@sungard.com> >>>>> >> wrote: >>>>> >> > Daan, >>>>> >> > >>>>> >> > Sorry for the delayed response but as Christopher mentioned to you in >>>>> his >>>>> >> > email I am getting my head around the CloudStack software. >>>>> >> > Since I am new to CloudStack but "old" to enterprise level JAVA the >>>>> task >>>>> >> is >>>>> >> > large but not impossible. I have no experience with running >>>>> >> > CloudStack >>>>> >> but >>>>> >> > considerable experience designing and maintaining large JAVA >>>>> >> applications. >>>>> >> > >>>>> >> > I've created what I believe is a very high level abstract of how the >>>>> >> current >>>>> >> > guest VRR's are created for guest networks with the intent of making >>>>> this >>>>> >> > abstract >>>>> >> > more detailed. >>>>> >> > >>>>> >> > 1 Get configuration data on Source Nat Router selected as a >>>>> >> > redundant >>>>> >> > router >>>>> >> > 1.1 Public and Guest network identified. >>>>> >> > 2 Both routers are provisioned >>>>> >> > 2.1 Software trys different, regions(?),zones,pods,clusters,hosts >>>>> in >>>>> >> > that order as the location of the router. Log maximum "distance" >>>>> apart. >>>>> >> > 3 Keepalived is configured >>>>> >> > 4 Both routers are started >>>>> >> > 5 Keepalived is started >>>>> >> > >>>>> >> > Obviously there is much more that is happening under each of the >>>>> >> > steps >>>>> >> > above. My intent is to complete this detailed "as is" listing as much >>>>> as >>>>> >> we >>>>> >> > can. Then using the "as is" description/sequence >>>>> >> > make a "to-be" addition for VPC's. When I get a consensus on WHAT >>>>> needs >>>>> >> to >>>>> >> > be implemented for the VRR in VPC then develop HOW best to implement >>>>> the >>>>> >> > "to-be" addition with the >>>>> >> > existing JAVA code as well as what additional classes need to be >>>>> >> > extended/implemented/created. >>>>> >> > >>>>> >> > Comments, critiques and changes to the above sequence are encouraged. >>>>> >> > >>>>> >> > I plan on posting this to the dev-list/Jira very soon. >>>>> >> > >>>>> >> > I have been using this functional spec as a guide, after discussing >>>>> this >>>>> >> > with our Systems Engineering people this spec meets our requirements. >>>>> >> > >>>>> >> > Do you have an implementation in mind? >>>>> >> > >>>>> >> > We have an internal Cloud Meeting with conflicts with the cloudstack >>>>> >> "day" >>>>> >> > next week so I will not be in attendence. >>>>> >> > >>>>> >> > Karl >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > On Tue, Jan 14, 2014 at 4:35 PM, Daan Hoogland < >>>>> daan.hoogl...@gmail.com> >>>>> >> > wrote: >>>>> >> >> >>>>> >> >> Hello overthere in the states, >>>>> >> >> >>>>> >> >> Tomorow I will start some experimenting with redundant vpc routers. >>>>> >> >> This is to check up on any findings and requirements that you might >>>>> >> >> have on this. Once again I would not like to waste work on this as >>>>> >> >> it >>>>> >> >> is really a globally usable feature that is probably universal. >>>>> >> >> >>>>> >> >> please let me know your status on this. >>>>> >> >> >>>>> >> >> If any of you are coming to the cloudstack day in London next week, >>>>> >> >> let's meetup next thursday. >>>>> >> >> >>>>> >> >> kind regards, >>>>> >> >> Daan Hoogland >>>>> >> >> >>>>> >> > >>>>> >> > >>>>> >> > >>>>> >> > -- >>>>> >> > Karl O. Harris >>>>> >> > Cloud Software Engineer >>>>> >> > Sungard Availability Services >>>>> >> > >>>>> >> >>>>> >> >>>>> >> >>>>> >> >>>>> >> -- >>>>> >> Karl O. Harris >>>>> >> Cloud Software Engineer >>>>> >> Sungard Availability Services >>>>> >> >>>>> >>>>> >>> >> >> >> >> -- >> Karl O. Harris >> Cloud Software Engineer >> Sungard Availability Services > -- Karl O. Harris Cloud Software Engineer Sungard Availability Services
