Connecting to nodes

Connecting to Valkey or Redis OSS nodes

Before attempting to connect to the Valkey or Redis OSS nodes in your cluster, you must have the endpoints for the nodes. To find the endpoints, see the following:

• Finding a Valkey or Redis OSS (Cluster Mode Disabled) Cluster's Endpoints (Console)

• Finding Endpoints for a Valkey or Redis OSS (Cluster Mode Enabled) Cluster (Console)

• Finding Endpoints (AWS CLI)

• Finding Endpoints (ElastiCache API)

In the following example, you use the valkey-cli utility to connect to a cluster that is running Valkey or Redis OSS.

Note

For more information about available commands, see the Commands webpage.

To connect to a Valkey or Redis OSS cluster using the valkey-cli

1. Connect to your Amazon EC2 instance using the connection utility of your choice.

   Note

   For instructions on how to connect to an Amazon EC2 instance, see the Amazon EC2 Getting Started Guide.

2. To build valkey-cli, download and install the GNU Compiler Collection (gcc). At the command prompt of your EC2 instance, enter the following command and enter y at the confirmation prompt.

   sudo yum install gcc

   Output similar to the following appears.

   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 valkey-cli utility. This utility is included in the Valkey software distribution. At the command prompt of your EC2 instance, type the following commands:

   Note

   For Ubuntu systems, before running make, run make distclean.

   wget https://github.com/valkey-io/valkey/archive/refs/tags/7.2.6.tar.gz
   tar xvzf valkey-7.2.6.tar.gz
   cd valkey-7.2.6
   make distclean      # ubuntu systems only
   make

4. At the command prompt of your EC2 instance, type the following command.

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

   A Valkey or Redis OSS command prompt similar to the following appears.

   redis mycachecluster.eaogs8.0001.usw2.cache.amazonaws.com 6379>

5. Test the connection by running Valkey or Redis OSS commands.

   You are now connected to the cluster and can run Valkey or Redis OSS commands. The following are some example commands with their Valkey or Redis OSS responses.

   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
   get b
   "Good-bye"
                      // wait 5 seconds
   get b
   (nil)                  // key has expired, nothing returned
   quit                   // Exit from valkey-cli

For connecting to nodes or clusters which have Secure Sockets Layer (SSL) encryption (in-transit enabled), see ElastiCache in-transit encryption (TLS).

Connecting to Memcached nodes

Before attempting to connect to your Memcached cluster, you must have the endpoints for the nodes. To find the endpoints, see the following:

• Finding a Cluster's Endpoints (Console) (Memcached)

• Finding Endpoints (AWS CLI)

• Finding Endpoints (ElastiCache API)

In the following example, you use the telnet utility to connect to a node that is running Memcached.

Note

For more information about Memcached and available Memcached commands, see the Memcached website.

To connect to a node using telnet

1. Connect to your Amazon EC2 instance by using the connection utility of your choice.

   Note

   For instructions on how to connect to an Amazon EC2 instance, see the Amazon EC2 Getting Started Guide.

2. Download and install the telnet utility on your Amazon EC2 instance. At the command prompt of your Amazon EC2 instance, type the following command and type y at the command prompt.

   sudo yum install telnet

   Output similar to the following appears.

   
   
   Loaded plugins: priorities, security, update-motd, upgrade-helper
   Setting up Install Process
   Resolving Dependencies
   --> Running transaction check
   
   ...(output omitted)...
   
   Total download size: 63 k
   Installed size: 109 k
   Is this ok [y/N]: y
   Downloading Packages:
   telnet-0.17-47.7.amzn1.x86_64.rpm                        |  63 kB     00:00  
   
   ...(output omitted)...
   
   Complete!
   

3. At the command prompt of your Amazon EC2 instance, type the following command, substituting the endpoint of your node for the one shown in this example.

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

   Output similar to the following appears.

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

4. Test the connection by running Memcached commands.

   You are now connected to a node, and you can run Memcached commands. The following is an example.

   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
   >