postgresql – Docker持久数据中的Postgres

我在docker容器中运行postgres来限制它可以访问的系统资源量.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/

建议使用仅数据容器,然后让我的postgres容器链接到它.我无法理解的是;这有什么好处？据我所知,如果由于某种原因停靠机器关闭(例如,将其移动到另一台物理机器),仅数据容器会停止运行,并且所有内容都会丢失？我已经尝试在postgres容器中创建一个卷,但它实际上似乎并没有将任何内容保存到磁盘中.

这是我的docker文件.我究竟做错了什么？

FROM ubuntu
MAINTAINER Andrew broadbent <andrew.bro[email protected]>

# 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"]

解决方法

这个回答你关于数据容器的问题：
docker mounting volumes on host

关于你的dockerfile,我建议你：

1)使用数据容器模式

2)通过指定：docker run -v [host-path]：[container-path] …将卷安装到主机上,这样数据将保存在主机的一个位置,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