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I have a set of instances in Oregon region and my jenkin server in California. How do i connect instances with jenikins server with their private IPs. I am not running Instances all time. I can easily connect with public IPS when instances are up running. But I dont want to change IPs each time when i restart the instances. Alternatives to permanent connection would be helpful to me.

-Thanks

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    – MLu
    Nov 3, 2018 at 3:46

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You’ve got a couple of options:

  • Assign Elastic IPs to the instances. EIPs are permanent and don’t change when you shut down/ restart the instances. So there will be no need to keep updating the IPs and you can also lock down the Security Groups because you’ll have known and permanent set of IPs. Note that there is a small cost for idle EIPs.

  • Set up Inter-region VPC Peering if your VPCs have non-overlapping IP ranges. That way the instances can talk over their private IP addresses.

  • Set up VPN between the regions. Probably an overkill for your situation as it will cost you more to either run the VGWs (VPN Gateways) or dedicated VPN EC2 Instances.

Hope that helps :)

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  • Note also that a VGW can't be used on both sides of a single VPN connection. The other side must be something else (e.g. running on an instance if the other side is also inside AWS) because VGWs always expect the peer to be the one to initiate the connection -- they never initiate.
    – Michael - sqlbot
    Sep 28, 2018 at 6:49
  • A bit more detail - an elastic IP is a good option to get a static IP, but it costs $0.005c/h when not used - that's $0.12 per day or $3.60 per month. VPC peering doesn't cost anything and allows connectivity via private IPs, so in this case may be the best option. VPN not really practical for reasons Michael outlined. PrivateLink is another option which I mention just for completeness, but isn't suitable in this case - it has an hourly cost.
    – Tim
    Sep 28, 2018 at 8:09

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