Run a Lua app
In this guide we create and deploy a simple Lua-based HTTP web server. To run this example, follow these steps:
-
Install the
kraft
CLI tool and a container runtime engine, e.g. Docker. -
Clone the
examples
repository andcd
into theexamples/http-lua5.1/
directory:
Make sure to log into KraftCloud by setting your token and a metro close to you.
We use fra0
(Frankfurt, 🇩🇪) in this guide:
When done, invoke the following command to deploy this application on KraftCloud:
The output shows the instance URL and other details:
In this case, the instance name is http-lua51-ma2i9
and the URL is https://young-night-5fpf0jj8.fra0.kraft.host
.
They are different for each run.
Use curl
to query the KraftCloud instance of the Lua-based HTTP web server:
At any point in time, you can list information about the instance:
When done, you can remove the instance:
Customize your Application
To customize the application, update the files in the repository, listed below:
http_server.lua
: the actual Lua HTTP serverKraftfile
: the KraftCloud specificationDockerfile
: the Docker-specified application filesystem
The following options are available for customizing the application:
-
If only updating the implementation in the
http_server.lua
source file, no other change is required. -
If new files are added, these have to be copied in the application filesystem, using the
COPY
command in theDockerfile
. -
If a new Lua source files is added, update the
cmd
line in theKraftfile
and replacehttp_server.lua
to run that file when creating the instance. -
More extensive changes may require expanding the
Dockerfile
with additionalDockerfile
commands.
Learn More
Use the --help
option for detailed information on using KraftCloud:
Or visit the CLI Reference.