Question

我在docker容器中运行postgres来限制它有权访问的系统资源量。我在理解如何使数据持久化方面遇到了一些麻烦。我已阅读以下文章：

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。我没有理解的是;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，并且它的所有内容都会丢失？我尝试在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。

这是我的泊坞文件。我做错了什么？

FROM ubuntu
MAINTAINER Andrew Broadbent <andrew.broadbent@manchester.ac.uk>

# 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

这个回答了有关数据容器的问题： 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] ...将卷装入主机，这样数据将保存在主机的一个位置，并且在删除容器后不会丢失。

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

Docker持久数据中的Postgres

1 个答案: