I am getting connection timeout from EC2 trying to connect to AWS Elasticache.
I launched a 1-node elasticache cluster
I launched an EC2 instance, made sure availability zone was the same as the cluster, us-west-2b
I did not create a new VPC. I see one is already created.
I ran a nslookup on my elasticache endpoint. It looks like a different /20 than my ec2.
I looked through the documentation and the ec2 launch and did not see where I can specify the subnet, except the availabilty zone.
I think the problem is about security groups of your instance.
To the best of my knowledge you need to allow the traffic on the security group associated to your EC2 instance.
If you are using memcached the port is 11211 if redis the port is 6379
Try to have a look to the AWS official documentation.
http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/GettingStarted.AuthorizeAccess.html
I hope this helps somehow.
Actually solution is to add security group to elasticache cluster, and this security group should allow 6379 port.
First, check the instance security group and check port 6379 is allowed in Inbound.
After that, check your default VPC security group and add inbound rule Custom TCP Rule-6379-Anywhere and save.
I hope this will fix the issue.
Related
I want to create a security group for AWS Elasticache (Redis).
As far as i see, i have 2 options:
Either open a Custom TCP connection on port 6379, and define the IP addresses what can reach Redis as a source.
Or, what currently works: I Open the 6379 port to anywhere (so that my EC2 instance can connect to it), and secure the components before the EC2.
What is the best approach here?
In your instance it sounds like you should have a single inbound rule for the security group assigned to your ElastiCache Redis cluster. This rule for port 6379 should specify the security group assigned to your EC2 instance(s) in the "source" field.
By specifying the security group ID in the source field, instead of an IP address or IP range, you can easily scale-out your EC2 server cluster, or make modifications to your EC2 instance that might result in an IP address change, without needing to change the security group rules for your ElastiCache cluster.
Note that if you do continue using IP addresses in your security group, you need to use the Private IP of the EC2 server, not the Public IP.
I have set an Amazon EC2 instance and an Amazon RDS instance. These two instances are both available.
I tried to connect to the RDS instance from my localhost, and I succeeded:
(I'm sorry about the picture's content is in Chinese, but the content in the red border means "success".)
In a word, when I used my localhost, I can connect to the RDS instance that I just set successfully.
But when I tried to use the EC2 instance to connect the same RDS instance with oracle sqldeveloper, I CANNOT EVEN CONNECT TO IT.
The error message is:
The Network Adapter could not establish the connection
How can I solve this issue?
Update:
My Security Group is:
The security groups match the AWS EC2 instance`s PRIVATE IP.
This answer is not necessarily a fix for your situation, but rather a recommendation about how to configure a security group.
Rather than using IP addresses within a security group, it is better to refer to another security group.
The configuration would be:
EC2-SG security group: Attach this to your EC2 instance. Allow access on desired ports (eg port 80).
RDS-SG security group: Attach this to your RDS instance. Allow access from EC2-SG- on desired port (eg port 3306).
This way, the RDS-SG will permit access from any EC2 instance associated with the EC2-SG security group. This will continue to work even if IP addresses change or additional EC2 instances are launched with the same EC2-SG.
I have created a redis endpoint on amazon elastic cache and also setup vpc & NAT gateway. I need to connect created redis endpoint with redis-cli. i using command like this
redis-cli -h dev-redis.434dffsdsf.0094.ustyue1.cache.amazonaws.com
But i got error message like this
Could not connect to Redis at dev-redis.a35gy4.0001.use1.cache.amazonaws.com:6379: Connection timed out
I tried with several ways
tried to connect from my local ubuntu machine.
tried to connect from a ec2 instance.
My source code is running on aws lambda. Using aws lambda we can successfully connect to the same redis endpoint.
What is the actual issue with my redis client?
Please check SG of ElastiCache. Redis instance should be accessible to server where you're running Redis CLI.
Option 1 will not work, as ElastiCache instances are not accessible outside of their VPC. From the FAQs: "Amazon ElastiCache Nodes, deployed within a VPC, can never be accessed from the Internet or from EC2 Instances outside the VPC."
Option 2 should work, if the EC2 instance is within the same VPC as the ElastiCache instance.
Adding more details as none of the answers here gave me full clarity
What is security group - security group in AWS is like a firewall.
What should I check in the security group - Check in inbound rules of the security group attached to the Redis if port 6379 is open to IPs within the CIDR (e.g. 192.168.32.0/20) of the EC2 instance from which you tried to access the Redis/ElasticCache
I have an EC2 instance in one region, N.California. I have an RDS instance in EU/Ireland. I am not able to connect to the RDS instance from the EC2 instance, the connection times out. This tutorial by aws says that I would need to use the Public IP of the RDS instance in order to connect to it. But this public IP is not available on the AWS console, I'm not even sure if we're supposed to be using any other than RDS endpoints. We're also disallowed from adding a security group from one region to the security group of another.
I am really unsure about how to proceed.
I am answering my own question because my own solution worked, and it might be of use to someone else considering that the AWS tutorial is wrong.
To connect, add a custom tcp rule over port 3306 in the security group Ingress Rules for the RDS instance, with the EIP of your EC2 instance as the allowed host. Voila.
Could someone give a step-by-step procedure for connecting to elasticache.
I'm trying to connect to a redis elasticache node from inside my EC2 instance (sshed in). I'm getting Connection Timed Out errors each time, and I can't figure out what's wrong with how I've configured my AWS settings.
They are in different VPCs, but in my elasticache VPC, I have a custom TCP inbound rule at port 6379 to accept from anywhere. And the two VPCs share an Active Peer connection that I set up. What more am I intended to do?
EDIT:
I am trying to connect via the redis-cli command. I sshed in because I was originally trying to connect via the node-redis module since my EC2 instance hosts a node server. So officially my two attempts are 1. A scripted module and 2. The redis-cli command provided in the AWS documentation.
As far as I can tell, I have also set up the route tables correctly according to this: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Route_Tables.html#route-tables-vpc-peering
You cannot connect to Elasticache from outside its VPC. It's a weird design decision on AWS' part, and although it's not documented well, it is documented here:
Amazon ElastiCache Nodes, deployed within a VPC, can never be accessed from the Internet or from EC2 Instances outside the VPC.
You can set your security groups to allow connections from everywhere, and it will look like it worked, but it won't matter or let you actually connect from outside the VPC (also a weird design decision).
In your Redis cluster properties you have a reference to the Security Group. Copy it.
In our EC2 instance you also have a Security Group. You should edit this Security Group and add the ID of the Redis Security Group as CIDR in the outbound connections + the port 6379.
This way the two Security Groups are linked and the connection can be established.
Two things we might forget when trying to connect to ElasticCache,
Configuring inbound TCP rule to allow incoming requests on port 6379
Adding EC2 security group in ElasticCache instance
Second one helped me.
Reference to (2) : https://www.youtube.com/watch?v=fxjsxtcgDoc&ab_channel=HendyIrawanSocialEnterprise
Here is step-by-step instructions for connection to Redis Elasticache cluster from EC2 inctance located in the same VPC as Elasticache:
Connect to a Elasticache Redis Cluster's Node