Docker Swift应用示例

Docker允许我们执行Swift应用程序。在以下示例中, 我们将创建一个使用Docker运行的swift文件。它包括以下步骤：

创建一个目录来组织应用程序文件。

$ mkdir swift-docker-app

变更目录

$ cd swift-docker-app

创建一个Dockerfile

它必须包含必要的Docker指令, Docker会使用这些指令来创建映像。

// 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"]

创建一个快速文件

创建一个Dockerfile之后, 我们正在创建一个Swift文件。这仅包含一个print语句, 该语句将在运行Docker映像时产生输出。

// index.swift

print("Hello from swift")

创建Docker映像

现在。按照以下命令构建Docker映像。

$ docker build -t swift-app .

运行Docker映像

$ docker run swift-app