我正在使用官方Postgres Docker镜像，尝试自定义其配置。为此，我使用sed命令来更改max_connections，例如：
sed -i -e"s/^max_connections = 100.*$/max_connections = 1000/" /var/lib/postgresql/data/postgresql.conf
我尝试了两种方法来应用这个配置信息：
- 第一种是将命令添加到脚本中，并将其复制到init文件夹：
/docker-entrypoint-initdb.d。 - 第二种方法是通过“RUN”命令在我的Dockerfile中直接运行命令（这个方法与一个非官方的PostgreSQL镜像使用不同路径
/etc/postgres/...的配置文件正常工作）。
我应该如何更改配置？
下面是用于创建镜像的Dockerfile：
# Database (http://www.cs3c.ma/)
FROM postgres:9.4
MAINTAINER Sabbane <contact@cs3c.ma>
ENV TERM=xterm
RUN apt-get update
RUN apt-get install -y nano
ADD scripts /scripts
# ADD scripts/setup-my-schema.sh /docker-entrypoint-initdb.d/
# Allow connections from anywhere.
RUN sed -i -e"s/^#listen_addresses =.*$/listen_addresses = '*'/" /var/lib/postgresql/data/postgresql.conf
RUN echo "host all all 0.0.0.0/0 md5" >> /var/lib/postgresql/data/pg_hba.conf
# Configure logs
RUN sed -i -e"s/^#logging_collector = off.*$/logging_collector = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_directory = 'pg_log'.*$/log_directory = '\/var\/log\/postgresql'/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_filename = 'postgresql-\%Y-\%m-\%d_\%H\%M\%S.log'.*$/log_filename = 'postgresql_\%a.log'/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_file_mode = 0600.*$/log_file_mode = 0644/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_truncate_on_rotation = off.*$/log_truncate_on_rotation = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_rotation_age = 1d.*$/log_rotation_age = 1d/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_min_duration_statement = -1.*$/log_min_duration_statement = 0/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_checkpoints = off.*$/log_checkpoints = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_connections = off.*$/log_connections = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_disconnections = off.*$/log_disconnections = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^log_line_prefix = '\%t \[\%p-\%l\] \%q\%u@\%d '.*$/log_line_prefix = '\%t \[\%p\]: \[\%l-1\] user=\%u,db=\%d'/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_lock_waits = off.*$/log_lock_waits = on/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#log_temp_files = -1.*$/log_temp_files = 0/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#statement_timeout = 0.*$/statement_timeout = 1800000 # in milliseconds, 0 is disabled (current 30min)/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^lc_messages = 'en_US.UTF-8'.*$/lc_messages = 'C'/" /var/lib/postgresql/data/postgresql.conf
# Performance Tuning
RUN sed -i -e"s/^max_connections = 100.*$/max_connections = 1000/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^shared_buffers =.*$/shared_buffers = 16GB/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#effective_cache_size = 128MB.*$/effective_cache_size = 48GB/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#work_mem = 1MB.*$/work_mem = 16MB/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#maintenance_work_mem = 16MB.*$/maintenance_work_mem = 2GB/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#checkpoint_segments = .*$/checkpoint_segments = 32/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#checkpoint_completion_target = 0.5.*$/checkpoint_completion_target = 0.7/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#wal_buffers =.*$/wal_buffers = 16MB/" /var/lib/postgresql/data/postgresql.conf
RUN sed -i -e"s/^#default_statistics_target = 100.*$/default_statistics_target = 100/" /var/lib/postgresql/data/postgresql.conf
VOLUME ["/var/lib/postgresql/data", "/var/log/postgresql"]
CMD ["postgres"]
使用这个Dockerfile进行构建过程时，出现了错误:
sed: 无法读取 /var/lib/postgresql/data/postgresql.conf: 没有那个文件或目录
docker exec -it container_id bash，然后进行修改，最后使用docker commit container_id myuser/myimage_myPostegresql:myversion进行提交。请参考文档 http://docs.docker.com/reference/commandline/cli/#commit - user2915097paintedfox/postgresql所提到的，可以直接在Dockerfile中更改配置。我认为这也应该适用于官方镜像。 - Sabbane