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Amazon ElastiCache
User Guide (API Version 2015-02-02)

Step 5: Connect to a Cluster's Node

Before you continue, be sure you have completed Step 4: Authorize Access.

This section assumes that you've created an Amazon EC2 instance and can connect to it. For instructions on how to do this, go to the Amazon EC2 Getting Started Guide.

An Amazon EC2 instance can connect to a cluster node only if you have authorized it to do so. For more information, see Step 4: Authorize Access.

Step 5.1: Find your Node Endpoints

Once your cluster is in the available state and you've authorized access to it (Step 4: Authorize Access), you can log in to an Amazon EC2 instance and connect to the cluster. To do so, you must first determine the endpoint.

To find your endpoints, see the relevant topic for the engine and cluster type you're running. When you find the endpoint you need, copy it to your clipboard for use in Step 5.2.

Step 5.2: Connect to a Memcached Cluster

Once your cluster is in the available state and you've authorized access to it (Step 4: Authorize Access, you can log in to an Amazon EC2 instance and connect to the cluster.

To connect to a Memcached cluster

  1. Sign in to the AWS Management Console and open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

  2. At the command prompt of your Amazon EC2 instance, type the following command, substituting the endpoint of your cluster and port for those shown in this example.

    telnet mycachecluster.eaogs8.0001.usw2.cache.amazonaws.com 11211

    This will produce output similar to the following.

    Trying 128.0.0.1... Connected to mycachecluster.eaogs8.0001.usw2.cache.amazonaws.com. Escape character is '^]'. >
  3. Run Memcached commands.

    You are now connected to the cluster and can run Memcached commands like the following.

    set a 0 0 5 // Set key "a" with no expiration and 5 byte value hello // Set value as "hello" STORED get a // Get value for key "a" VALUE a 0 5 hello END get b // Get value for key "b" results in miss END >

Step 5.2: Connect to a Redis Cluster or Replication Group

Now that you have the endpoint you need, you can log in to an EC2 instance and connect to the cluster or replication group.

In the following example, you use the redis-cli utility to connect to a cluster that is not encryption enabled and running Redis. For more information about Redis and available Redis commands, see Redis commands webpage.

To connect to a Redis cluster that is not encryption enabled using the redis-cli

  1. Connect to your Amazon EC2 instance using the connection utility of your choice. For instructions on how to connect to an Amazon EC2 instance, see the Amazon EC2 Getting Started Guide.

  2. Download and install the GNU Compiler Collection (gcc).

    At the command prompt of your EC2 instance, type the following command then, at the confirmation prompt, type y .

    sudo yum install gcc

    This will produce output similar to the following.

    Loaded plugins: priorities, security, update-motd, upgrade-helper Setting up Install Process Resolving Dependencies --> Running transaction check ...(output omitted)... Total download size: 27 M Installed size: 53 M Is this ok [y/N]: y Downloading Packages: (1/11): binutils-2.22.52.0.1-10.36.amzn1.x86_64.rpm | 5.2 MB 00:00 (2/11): cpp46-4.6.3-2.67.amzn1.x86_64.rpm | 4.8 MB 00:00 (3/11): gcc-4.6.3-3.10.amzn1.noarch.rpm | 2.8 kB 00:00 ...(output omitted)... Complete!
  3. Download and compile the redis-cli utility. This utility is included in the Redis software distribution.

    At the command prompt of your EC2 instance, type the following commands:

    wget http://download.redis.io/redis-stable.tar.gz tar xvzf redis-stable.tar.gz cd redis-stable make distclean // Ubuntu systems only make
  4. At the command prompt of your EC2 instance, type the following command, substituting the endpoint of your cluster and port for what is shown in this example.

    src/redis-cli -c -h mycachecluster.eaogs8.0001.usw2.cache.amazonaws.com -p 6379

    This results in a Redis command prompt similar to the following.

    redis mycachecluster.eaogs8.0001.usw2.cache.amazonaws.com 6379>
  5. Run Redis commands.

    You are now connected to the cluster and can run Redis commands like the following.

    set a "hello" // Set key "a" with a string value and no expiration OK get a // Get value for key "a" "hello" get b // Get value for key "b" results in miss (nil) set b "Good-bye" EX 5 // Set key "b" with a string value and a 5 second expiration "Good-bye" get b // Get value for key "b" "Good-bye" // wait >= 5 seconds get b (nil) // key has expired, nothing returned quit // Exit from redis-cli