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Docker Swift Application Example

Docker allows us to execute swift application. In the following example, we are creating a swift file which run by using Docker. It consists of the following steps:

1. Create a directory to organize application files.
$ mkdir swift-docker-app



2. Change Directory
$ cd swift-docker-app



3. Create a Dockerfile

It is required to contains necessary Docker instructions which are used by Docker to create image.

// Dockerfile

FROM ubuntu:16.04 MAINTAINER Haris Amin <aminharis7@gmail.com> # Install related packages and set LLVM 3.6 as the compiler RUN apt-get -q update && apt-get -q install -y make libc6-dev clang-3.6 curl libedit-dev python2.7 python2.7-dev libicu-dev rsync libxml2 git libcurl4-openssl-dev && update-alternatives –quiet –install /usr/bin/clang clang /usr/bin/clang-3.6 100 && update-alternatives –quiet –install /usr/bin/clang++ clang++ /usr/bin/clang++-3.6 100 && rm -r /var/lib/apt/lists/* # Everything up to here should cache nicely between Swift versions, assuming dev dependencies change little ENV SWIFT_BRANCH=swift-3.0.2-release SWIFT_VERSION=swift-3.0.2-RELEASE SWIFT_PLATFORM=ubuntu16.04 PATH=/usr/bin:$PATH # Download GPG keys, signature and Swift package, then unpack and cleanup RUN SWIFT_URL=https://swift.org/builds/$SWIFT_BRANCH/$(echo “$SWIFT_PLATFORM” | tr -d .)/$SWIFT_VERSION/$SWIFT_VERSION-$SWIFT_PLATFORM.tar.gz && curl -fSsL $SWIFT_URL -o swift.tar.gz && curl -fSsL $SWIFT_URL.sig -o swift.tar.gz.sig && export GNUPGHOME=”$(mktemp -d)” && set -e; for key in # pub 4096R/412B37AD 2015-11-19 [expires: 2017-11-18] # Key fingerprint = 7463 A81A 4B2E EA1B 551F FBCF D441 C977 412B 37AD # uid Swift Automatic Signing Key #1 <swift-infrastructure@swift.org> 7463A81A4B2EEA1B551FFBCFD441C977412B37AD # pub 4096R/21A56D5F 2015-11-28 [expires: 2017-11-27] # Key fingerprint = 1BE1 E29A 084C B305 F397 D62A 9F59 7F4D 21A5 6D5F # uid Swift 2.2 Release Signing Key <swift-infrastructure@swift.org> 1BE1E29A084CB305F397D62A9F597F4D21A56D5F # pub 4096R/91D306C6 2016-05-31 [expires: 2018-05-31] # Key fingerprint = A3BA FD35 56A5 9079 C068 94BD 63BC 1CFE 91D3 06C6 # uid Swift 3.x Release Signing Key <swift-infrastructure@swift.org> A3BAFD3556A59079C06894BD63BC1CFE91D306C6 ; do gpg –quiet –keyserver ha.pool.sks-keyservers.net –recv-keys “$key”; done && gpg –batch –verify –quiet swift.tar.gz.sig swift.tar.gz && tar -xzf swift.tar.gz –directory / –strip-components=1 && rm -r “$GNUPGHOME” swift.tar.gz.sig swift.tar.gz # Print Installed Swift Version RUN swift –version COPY . /var/www/java WORKDIR /var/www/java CMD [“swift”,”index.swift”]
4. Create a swift file

Afetr creating a Dockerfile, we are creating a Swift file. This includes only one print statement that will produce the output when Docker images is run.

// index.swift

print(“Hello from swift”)
5. Create Docker Image

Now. Follow the following command to build Docker image.

$ docker build -t swift-app .



6. Running the Docker Image
$ docker run swift-app

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