docker-compose pull
Usage: pull [options] [SERVICE...]
Options:
--ignore-pull-failures Pull what it can and ignores images with pull failures.
--parallel Pull multiple images in parallel.
--quiet Pull without printing progress information提取与在docker-compose.yml或docker-stack.yml文件中定义的服务相关联的映像，但不会基于这些映像启动容器。
例如，假设您docker-compose.yml从 Quickstart：Compose 和 Rails 示例中获得此文件。
version: '2'
services:
db:
image: postgres
web:
build: .
command: bundle exec rails s -p 3000 -b '0.0.0.0'
volumes:
- .:/myapp
ports:
- "3000:3000"
depends_on:
- db如果你docker-compose pull ServiceName在docker-compose.yml定义服务的文件所在的目录下运行，Docker 会提取 postgres 镜像。例如，要在我们的示例中调用postgres配置为db服务的映像，您可以运行docker-compose pull db。
$ docker-compose pull db
Pulling db (postgres:latest)...
latest: Pulling from library/postgres
cd0a524342ef: Pull complete
9c784d04dcb0: Pull complete
d99dddf7e662: Pull complete
e5bff71e3ce6: Pull complete
cb3e0a865488: Pull complete
31295d654cd5: Pull complete
fc930a4e09f5: Pull complete
8650cce8ef01: Pull complete
61949acd8e52: Pull complete
527a203588c0: Pull complete
26dec14ac775: Pull complete
0efc0ed5a9e5: Pull complete
40cd26695b38: Pull complete
Digest: sha256:fd6c0e2a9d053bebb294bb13765b3e01be7817bf77b01d58c2377ff27a4a46dc
Status: Downloaded newer image for postgres:latestfig, composition, compose, docker, orchestration, cli, pull
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