We have couple of RDS that are not added under VPC, so we need to bring them under VPC. Please let me know the steps and downtime expected. Also let me know if there need to be any changes in the webservers, so that everything works fine after RDS is under VPC.
You must have a VPC created before hand that have subnet in atleast two different regions.
After this go and create a "subnet group" for RDS and add two existing subnet in that.
Next take a snapshot of your RDS instance and start a new RDS instance from snapshot in VPC.
That should be it.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_VPC.html#USER_VPC.Non-VPC2VPC - official documentation from Amazon.
Depending on your configuration and if the RDS needs to be accessible from the Internet you will have to check the option "Publicly Accessible" in the creation wizard and (in addition to the subnets mentioned in other answers) ensure that the Security has port for the DB properly enabled (and maybe from 0.0.0.0/0).
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I have one VPC with an RDS instance in it. They are both located in the same region.
I want to use the RDS instance in another VPC, that is in another region on another AWS account (we have multiple AWS accounts). If that's not complicated enough the 2nd VPC comes up via CloudFormation (i.e. dynamic). Whenever I am bringing up a CloudFormation stack I want to attach the RDS instance automatically.
I have looked at:
exposing the RDS instance on the public internet :(
an ELB w/ TCP transport to put the database instance behind
VPC peering but the different regions and the approval workflow in the AWS console make little sense in the case we are using CloudFormation
All of these seem suboptimal to me and was wondering if somebody already did this before. If yes, please share what you did and what the though process behind it was.
Use a VPN tunnel from one VPC to the other. You could build your own or look at Vyatta. Ideally the two VPCs do not have overlapping CIDRs. Note that you cannot use VPC peering inter-region.
For anyone who stumbles around here, it looks like AWS VPC Peering can now be done cross region: https://docs.aws.amazon.com/vpc/latest/peering/what-is-vpc-peering.html
I was wondering if it's possible to remove an ec2 instance from VPC. If so, how can i do it? I was doing some tests and and i would like to remove my instances without terminate all of them.
Thank in advance.
You cannot move an instance between VPC and non-VPC, only launch new instances.
The 'opposite' of VPC is called EC2 Classic. As you can tell by the name, Amazon is depreciating this mode. All new accounts since December 2013 are VPC only. Several new features only work in VPC (for example, 'Enhanced Networking').
The writing is on the wall: You will need to move to VPC sooner or later. During the migration, you can use EC2 ClassicLink to let your EC2 Classic boxes talk with boxes in your VPC groups.
Remeber that when you create an instance, you specify the VPC that it will be launched in. It is not possible to change the VPC without terminating the instance and re-launching it in the new one.
One possible option would be to create an AMI of your currently running instance, and relaunch it in your preferred VPC using that AMI.
I am faced with a chicken and egg problem. I currently have a server in EC2 classic, as well as an RDS instance -- in EC2 classic as well. The EC2 instances also interact with Cassandra cluster, which also resides in EC2 classic.
However, I need to move RDS into the VPC. Now, in an ideal world, I'd have all of my stuff in VPC at this point. However, that presents a major migration challenge and I'd like to minimize impact on users and keep steps to minimum -- this is mainly because of the Cassandra cluster.
It turns out that I cannot create security group rules between VPC and Non-VPC security groups.
So, how can I have RDS in VPC that my EC2 instances can access w/o having to open up my RDS to the entire world ?
Any help is greatly appreciated.
UPDATE: So, one idea I had is to assign elastic IPs to my EC2 instances and add IPs explicitly to the security group for RDS within VPC. Would that work ? (trying it now using https://github.com/skymill/aws-ec2-assign-elastic-ip)
Yes, unfortunately that's the only way to do it. You cannot use DNS in security groups, so you're stuck with IP address.
So, I ended up solving it exactly like I described -- assign elastic IPs to my EC2 instances and add IPs explicitly to the security group for RDS within VPC. It ended up working great.
I'm following AWS's instructions Scenario 2: VPC with Public and Private Subnets and am having issues at the point I try to launch a DB server.
When I launch my instance, all is fine and I am able to assign it to my newly created VPC. However, when it comes to launch the RDS, the only VPC available (on step 4, configure advanced settings) is the default VPC (ie not the one I created as per their instructions).
Has anyone any idea about this or indeed how to resolve it?
RDS requires a little more setup than an EC2 instance if you want to launch it within a VPC.
Specifically, you need to create:
a DB subnet group within the VPC
a VPC security group for the RDS instance
The documentation is a little buried in the AWS RDS documents. It can be found here:
Creating a DB Instance in a VPC
When a new security group is added, or the existing one is modified, the affects are not visible. For instance, I have a security group called “mdi-sg-redshift” with two rules:
As you can see, these rules allow inbounds from anyone across the globe. When applied to the cluster, they should allow inbounds at those ports. Does NOT work! I have rebooted the cluster to no affect.
Here is the snapshot of my Redshift Cluster:
Here is the snapshot of the port scanner.
The cluster was rebooted several times to no effect.
Also noted that the cluster belongs to the same region as the VPC and the security group. The cluster belongs to the VPC that has the security group applied.
I have seen similar issues on EC2 side, but reboots usually fixed it. Not this time.
Anyone with insights? Thanks!
This sounds mostly a VPC rules issue.
Things I will check:
Do you get the same issue if you create your cluster outside of VPC?
Check Cluster Subnet group. It says default in your screen shot. Which subnet groups is dded to this default subnet group? Make sure your cluster is running in the subnet which is added to default subnet group.
Check VPC security group policy for the Red-shift cluster
Did this set-up ever worked in the past ? OR is it the 1st time you are working on this cluster? If it worked in the past, then what setting with respect to VPC/cluster subnet group/ VPC security groups has changed?
Where are you accessing Redshift from?
If you ar trying to access Redshift from outside VPC then please check the Route Table for an entry of Internet Gateway (to verify if the Redshift cluster is publicly available over internet)
If you are trying to access Redshift from within VPC then there might be some other issue that might be stopping access