Postgres在Docker持久数据

我在Docker容器中运行postgres来限制它有权访问的系统资源的数量。 我在理解如何使数据持久化方面遇到了一些麻烦。 我读过以下文章：

https://www.andreagrandi.it/2015/02/21/how-to-create-a-docker-image-for-postgresql-and-persist-data/

http://container42.com/2013/12/16/persistent-volumes-with-docker-container-as-volume-pattern/

哪个build议使用一个只有数据的容器，然后让我的postgres容器链接到它。 我不明白的是 这有什么好处？ 据我所知，如果由于某种原因停泊docker机器（例如，移动到不同的物理机器），数据只容器停止运行，它的所有内容都丢失？ 我已经尝试在postgres容器中创build一个卷，但实际上并没有将任何内容保存到磁盘。

这是我的docker文件。 我究竟做错了什么？

FROM ubuntu MAINTAINER Andrew Broadbent <[e-mail]> # Add the PostgreSQL PGP key to verify their Debian packages. # It should be the same key as https://www.postgresql.org/media/keys/ACCC4CF8.asc RUN apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8 # Add PostgreSQL's repository. It contains the most recent stable release # of PostgreSQL, ``9.3``. RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list # Install ``python-software-properties``, ``software-properties-common`` and PostgreSQL 9.3 # There are some warnings (in red) that show up during the build. You can hide # them by prefixing each apt-get statement with DEBIAN_FRONTEND=noninteractive RUN apt-get update && apt-get install -y python-software-properties software-properties-common postgresql-9.3 postgresql-client-9.3 postgresql-contrib-9.3 # Note: The official Debian and Ubuntu images automatically ``apt-get clean`` # after each ``apt-get`` # Run the rest of the commands as the ``postgres`` user created by the ``postgres-9.3`` package when it was ``apt-get installed`` USER postgres # Create a PostgreSQL role named ``docker`` with ``docker`` as the password and # then create a database `docker` owned by the ``docker`` role. # Note: here we use ``&&\`` to run commands one after the other - the ``\`` # allows the RUN command to span multiple lines. RUN /etc/init.d/postgresql start &&\ psql --command "CREATE USER docker WITH SUPERUSER PASSWORD 'docker';" &&\ createdb -O docker docker # Complete configuration USER root RUN echo "host all all 0.0.0.0/0 md5" >> /etc/postgresql/9.3/main/pg_hba.conf RUN echo "listen_addresses='*'" >> /etc/postgresql/9.3/main/postgresql.conf # Expose the PostgreSQL port EXPOSE 5432 # Add VOLUMEs to allow backup of config, logs and databases RUN mkdir -p /var/run/postgresql && chown -R postgres /var/run/postgresql VOLUME ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"] # Set the default command to run when starting the container USER postgres CMD ["/usr/lib/postgresql/9.3/bin/postgres", "-D", "/var/lib/postgresql/9.3/main", "-c", "config_file=/etc/postgresql/9.3/main/postgresql.conf"] 

Answer 1

这一个回答你关于数据容器的问题： docker在主机上装入卷

关于你的dockerfile，我会build议你：

1）使用数据容器模式

2）通过指定： docker run -v [host-path]:[container-path] ...来将卷挂载到主机上，这样数据将被保存在主机中的一个地方，并且在容器后不会丢失已移除。

参考： https ： //docs.docker.com/engine/tutorials/dockervolumes/#/mount-a-host-directory-as-a-data-volume