Question

我有一个Python / PostgreSQL项目我试图放入Docker容器。当我尝试在容器内运行psql命令以在构建映像时创建用户和数据库时，我收到此错误：

psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

这是一个Dockerfile：

FROM python:2.7-slim

WORKDIR /app

ADD . /app

RUN apt-get update && apt-get install -y postgresql postgresql-contrib libgeos-c1

RUN service postgresql start

RUN su postgres bash -c "psql -c \"CREATE USER myuser WITH PASSWORD 'password';\"" \
   && su postgres bash -c "psql -c \"CREATE DATABASE db WITH OWNER = myuser;\""```

请注意，我甚至尝试在psql命令之前启动 postgresql 服务。

我尝试了另一种方法，即使用基本映像postgres:9.6.3并在其上安装Python pip。我仍然得到同样的错误。这是第二个Dockerfile供参考：

FROM postgres:9.6.3

WORKDIR /app

ADD . /app

RUN apt-get update && apt-get install -y python-pip libgeos-c1

RUN service postgresql start

RUN su postgres bash -c "psql -c \"CREATE USER myuser WITH PASSWORD 'password';\"" \
   && su postgres bash -c "psql -c \"CREATE DATABASE db WITH OWNER = myuser;\""

忏悔：我是码头工人。

Answer 1

这与Multiple RUN vs. single chained RUN in Dockerfile, what is better?

相关

我也遇到了一个码头工作人员。每个RUN可能不在相同的“上下文”中。请参阅此输出，请注意start命令和psql命令的容器不同。似乎它在构建图像时构建容器的快照。

Step 25/30 : RUN service postgresql start
 ---> Running in 5c22e985359c
Starting PostgreSQL 9.6 database server: main.
Removing intermediate container 5c22e985359c
 ---> db1f2c2cdb33
Step 26/30 : USER postgres
 ---> Running in 6d56501e7286
Removing intermediate container 6d56501e7286
 ---> b35d3912eacf
Step 27/30 : RUN psql -c "CREATE USER user with password 'password'"
 ---> Running in 8c9130d2daa5
psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain

我使用以下命令将这些命令链接在一起

RUN service postgresql start &&\
  sudo -u postgres psql -c "CREATE USER user with password 'password'"

成功创建用户命令的结果，如果需要，应该能够继续进行更多＆amp;＆amp; \

Step 23/23 : RUN service postgresql start &&  sudo -u postgres psql -c "CREATE USER user with password 'password'"
 ---> Running in f234f6074f56
Starting PostgreSQL 9.6 database server: main.
CREATE ROLE

Answer 2

最好在docker-entrypoint-initdb.d中使用脚本。在Dockerfile

中

COPY ./init-user-db.sh /docker-entrypoint-initdb.d/init-user-db.sh

脚本本身：

#!/bin/bash
set -e

psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
CREATE USER docker;
CREATE DATABASE docker;
GRANT ALL PRIVILEGES ON DATABASE docker TO docker;

EOSQL

此处有更多详细信息：https://docs.docker.com/samples/library/postgres/#how-to-extend-this-image

Docker：无法从Dockerfile运行psql命令

2 个答案: