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安装与卸载

Compose 目前支持 Linux 和 Mac OS 平台,两者的安装过程大同小异。

安装 Compose 之前,要先安装 Docker(需要 Docker Engine 1.7.1+),请参考第一部分中章节,在此不再赘述。

Compose 可以通过 Python 的 pip 工具进行安装,可以直接下载编译好的二进制文件使用,甚至直接运行在 Docker 容器中。

前两种方式是传统方式,适合本地环境下安装使用;最后一种方式则不破坏系统环境,更适合云计算场景。

PIP 安装

这种方式是将 Compose 当作一个 Python 应用来从 pip 源中安装。

执行安装命令:

$ sudo pip install -U docker-compose

可以看到类似如下输出,说明安装成功。

Collecting docker-compose
  Downloading docker-compose-1.8.0.tar.gz (149kB): 149kB downloaded
...
Successfully installed docker-compose cached-property requests texttable websocket-client docker-py dockerpty six enum34 backports.ssl-match-hostname ipaddress

安装成功后,可以查看 docker-compose 命令的用法。

$ docker-compose -h
Define and run multi-container applications with Docker.

Usage:
  docker-compose [-f=<arg>...] [options] [COMMAND] [ARGS...]
  docker-compose -h|--help

Options:
  -f, --file FILE           Specify an alternate compose file (default: docker-compose.yml)
  -p, --project-name NAME   Specify an alternate project name (default: directory name)
  --x-networking            (EXPERIMENTAL) Use new Docker networking functionality.
                            Requires Docker 1.9 or later.
  --x-network-driver DRIVER (EXPERIMENTAL) Specify a network driver (default: "bridge").
                            Requires Docker 1.9 or later.
  --verbose                 Show more output
  -v, --version             Print version and exit

Commands:
  build              Build or rebuild services
  help               Get help on a command
  kill               Kill containers
  logs               View output from containers
  pause              Pause services
  port               Print the public port for a port binding
  ps                 List containers
  pull               Pulls service images
  restart            Restart services
  rm                 Remove stopped containers
  run                Run a one-off command
  scale              Set number of containers for a service
  start              Start services
  stop               Stop services
  unpause            Unpause services
  up                 Create and start containers
  migrate-to-labels  Recreate containers to add labels
  version            Show the Docker-Compose version information

之后,可以添加 bash 补全命令。

$ curl -L https://raw.githubusercontent.com/docker/compose/1.8.0/contrib/completion/bash/docker-compose > /etc/bash_completion.d/docker-compose

二进制包

官方定义编译好二进制包,供大家使用。这些发布的二进制包可以在 https://github.com/docker/compose/releases 页面找到。

这些二进制文件,下载后直接放到执行路径下,并添加执行权限即可。

例如,在 Linux 平台上。

$ sudo curl -L https://github.com/docker/compose/releases/download/1.8.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
$ sudo chmod a+x /usr/local/bin/docker-compose

可以使用 docker-compose version 命令来查看版本信息,以测试是否安装成功。

$ docker-compose version
docker-compose version 1.8.0, build 94f7016
docker-py version: 1.9.0
CPython version: 2.7.6
OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014

容器中执行

Compose 既然是一个 Python 应用,自然也可以直接用容器来执行它。

$ curl -L https://github.com/docker/compose/releases/download/1.8.0/run.sh > /usr/local/bin/docker-compose
$ chmod +x /usr/local/bin/docker-compose

实际上,查看下载的 run.sh 脚本内容,如下

set -e

VERSION="1.8.0"
IMAGE="docker/compose:$VERSION"


# Setup options for connecting to docker host
if [ -z "$DOCKER_HOST" ]; then
    DOCKER_HOST="/var/run/docker.sock"
fi
if [ -S "$DOCKER_HOST" ]; then
    DOCKER_ADDR="-v $DOCKER_HOST:$DOCKER_HOST -e DOCKER_HOST"
else
    DOCKER_ADDR="-e DOCKER_HOST -e DOCKER_TLS_VERIFY -e DOCKER_CERT_PATH"
fi


# Setup volume mounts for compose config and context
if [ "$(pwd)" != '/' ]; then
    VOLUMES="-v $(pwd):$(pwd)"
fi
if [ -n "$COMPOSE_FILE" ]; then
    compose_dir=$(dirname $COMPOSE_FILE)
fi
# TODO: also check --file argument
if [ -n "$compose_dir" ]; then
    VOLUMES="$VOLUMES -v $compose_dir:$compose_dir"
fi
if [ -n "$HOME" ]; then
    VOLUMES="$VOLUMES -v $HOME:$HOME -v $HOME:/root" # mount $HOME in /root to share docker.config
fi

# Only allocate tty if we detect one
if [ -t 1 ]; then
    DOCKER_RUN_OPTIONS="-t"
fi
if [ -t 0 ]; then
    DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -i"
fi

exec docker run --rm $DOCKER_RUN_OPTIONS $DOCKER_ADDR $COMPOSE_OPTIONS $VOLUMES -w "$(pwd)" $IMAGE "$@"

可以看到,它其实是下载了 docker/compose 镜像并运行。

卸载

如果是二进制包方式安装的,删除二进制文件即可。

$ sudo rm /usr/local/bin/docker-compose

如果是通过 python pip 工具安装的,则可以执行如下命令删除。

$ sudo pip uninstall docker-compose

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