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Guides

Memcached

This guide shows you how to use Memcached. Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.

To run it, follow these steps:

1. Install the CLI. Use the unikraft CLI or the legacy kraft CLI. You need a BuildKit builder. The easiest way to get one is via Docker. Alternatively, you can also directly set up and use BuildKit, see the quick start.

2. Clone the examples repository and cd into the examples/memcached1.6/ directory:

Code
git clone https://github.com/unikraft-cloud/examples
cd examples/memcached1.6/

Make sure to log into Unikraft Cloud and pick a metro close to you. This guide uses fra (Frankfurt, 🇩🇪):

When done, invoke the following command to deploy this app on Unikraft Cloud:

The output shows the instance address and other details:

In this case, the instance name is memcached16-arkv7 which is different for each run.

To test the deployment, first forward the port with the socat command:

Code
socat TCP-LISTEN:11211,reuseaddr,fork OPENSSL:weathered-smoke-hehsdinv.fra.unikraft.app:11211,verify=0

Now, on a separate console, run the following commands to test that it works (you should see output when incrementing):

Code
telnet 127.0.0.1 11211

set test 0 0 1
0

incr test 1

incr test 1

To exit telnet run:

Code
Ctrl + ]
Ctrl + C

To disconnect, kill the socat command with ctrl-C.

You can list information about the instance by running:

When done, you can remove the instance:

Customize your app

To customize the app, update the files in the repository, listed below:

• Kraftfile: the Unikraft Cloud specification, including command-line arguments
• Dockerfile: In case you need to add files to your instance's rootfs

Learn more

Use the --help option for detailed information on using Unikraft Cloud:

Or visit the CLI Reference or the legacy CLI Reference.