Run a PHP app
In this guide we create and deploy a simple PHP-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-php8.2/
directory:
git clone https://github.com/kraftcloud/examplescd examples/http-php8.2/
Make sure to log into Unikraft Cloud by setting your token and a metro close to you.
We use fra0
(Frankfurt, 🇩🇪) in this guide:
# Set Unikraft Cloud access tokenexport UKC_TOKEN=token# Set metro to Frankfurt, DEexport UKC_METRO=fra0
When done, invoke the following command to deploy this application on Unikraft Cloud:
kraft cloud deploy -p 443:8080 .
The output shows the instance URL and other details:
[●] Deployed successfully! │ ├────────── name: http-php82-g00si ├────────── uuid: 033b2f4b-72ff-414d-b0de-63571477c657 ├───────── state: running ├─────────── url: https://aged-fire-rh0oi0tj.fra0.kraft.host ├───────── image: http-php82@sha256:dccaac053982673765b8f00497a9736c31458ab23ad59a550b09aa8dedfabb34 ├───── boot time: 32.80 ms ├──────── memory: 128 MiB ├─────── service: aged-fire-rh0oi0tj ├── private fqdn: http-php82-g00si.internal ├──── private ip: 172.16.3.3 └────────── args: /usr/local/bin/php /usr/src/server.php
In this case, the instance name is http-php82-g00si
and the URL is https://aged-fire-rh0oi0tj.fra0.kraft.host
.
They are different for each run.
Use curl
to query the Unikraft Cloud instance of the PHP-based HTTP web server:
curl https://aged-fire-rh0oi0tj.fra0.kraft.host
Hello, World!
At any point in time, you can list information about the instance:
kraft cloud instance list
NAME FQDN STATE CREATED AT IMAGE MEMORY ARGS BOOT TIMEhttp-php82-g00si aged-fire-rh0oi0tj.fra0.kraft.host running 50 seconds ago http-php82@sha256:dccaac05398267376... 256 MiB /usr/local/bin/php /usr/src/server.php 32801us
When done, you can remove the instance:
kraft cloud instance remove http-php82-g00si
Customize your Application
To customize the application, update the files in the repository, listed below:
server.php
: the actual PHP HTTP serverphp.ini
: the PHP configurationKraftfile
: the Unikraft Cloud specificationDockerfile
: the Docker-specified application filesystem
#!/usr/local/bin/php -q<?phperror_reporting(E_ALL);
/* Allow the script to hang around waiting for connections. */set_time_limit(0);
/* Turn on implicit output flushing so we see what we're getting * as it comes in. */ob_implicit_flush();
$address = '0.0.0.0';$port = 8080;
if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";}
if (socket_bind($sock, $address, $port) === false) { echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";}
if (socket_listen($sock, 5) === false) { echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";}
do { if (($msgsock = socket_accept($sock)) === false) { echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; break; } /* Send instructions. */ $msg = "HTTP/1.1 200 OK\r\n" . "Content-Type: text/html\r\n" . "Content-Length: 14\r\n" . "Connection: close\r\n" . "\r\n" . "Hello, World!\n"; socket_write($msgsock, $msg, strlen($msg));
socket_close($msgsock);} while (true);
socket_close($sock);?>
[PHP]
extension=sockets
spec: v0.6
runtime: php:8.2
rootfs: ./Dockerfile
cmd: ["/usr/local/bin/php", "/usr/src/server.php"]
FROM scratch
# PHP configurationCOPY ./php.ini /usr/local/etc/php/php.ini
# Simple PHP HTTP serverCOPY ./server.php /usr/src/server.php
The following options are available for customizing the application:
-
If only updating the implementation in the
server.php
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 new extension are required, that may require the update the of thephp.ini
file. -
If a new PHP source files is added, update the
cmd
line in theKraftfile
and replaceserver.php
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 Unikraft Cloud:
kraft cloud --help
Or visit the CLI Reference.