我尝试通过docker-entrypoint-initdb. d中的初始化脚本运行flyway迁移来扩展docker postgres镜像。
正如here所指出的，在初始化阶段，数据库只在unix套接字上列出。
我在运行flyway migrate时遇到了麻烦，因为我无法通过unix套接字连接到数据库，并且不断得到以下变体：

WARNING: Connection error: Connection to :5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. (Caused by Connection refused (Connection refused)) Retrying in 1 sec...

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Dockerfile：

FROM postgres:10.14-alpine

ENV POSTGRES_USER=postgres
ENV POSTGRES_PASSWORD=password
ENV POSTGRES_DB=mydb
ENV FLYWAY_VERSION="6.0.8"
ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk/jre
ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin
ENV JAVA_VERSION 8u181
ENV JAVA_ALPINE_VERSION 8.252.09-r0

RUN { \
    echo '#!/bin/sh'; \
    echo 'set -e'; \
    echo; \
    echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \
    } > /usr/local/bin/docker-java-home \
    && chmod +x /usr/local/bin/docker-java-home

RUN set -x \
    && apk add --no-cache \
    openjdk8-jre="$JAVA_ALPINE_VERSION" \
    && [ "$JAVA_HOME" = "$(docker-java-home)" ]

# Install Flyway
WORKDIR /flyway

RUN apk --no-cache add --update bash openssl \
    && wget https://repo1.maven.org/maven2/org/flywaydb/flyway-commandline/${FLYWAY_VERSION}/flyway-commandline-${FLYWAY_VERSION}.tar.gz \
    && tar -xzf flyway-commandline-${FLYWAY_VERSION}.tar.gz \
    && mv flyway-${FLYWAY_VERSION}/* . \
    && rm flyway-commandline-${FLYWAY_VERSION}.tar.gz \
    && ln -s /flyway/flyway /usr/local/bin/flyway

# Change ownership of flyway to postgres user
RUN chown postgres /flyway/flyway

# Copy flyway sql migrations and configuration
COPY flyway-sql-migrations/sql_migrations /flyway/sql_migrations
COPY test-utils/flyway.conf /flyway/flyway.conf

# Copy flyway initialization script
COPY test-utils/flyway-migrate.sh /docker-entrypoint-initdb.d/flyway-migrate.sh

型
flyway-migrate.sh：

#!/bin/sh

flyway -configFiles=/flyway/flyway.conf migrate

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flyway.conf：

flyway.url=jdbc:postgresql://:5432/mydb
flyway.user=postgres
flyway.password=password
flyway.locations=filesystem:/flyway/sql_migrations
flyway.table=flyway_schema_history
flyway.connectRetries=60

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在做了一些研究和咨询theseposts（同样的问题，问题确定，但没有给出答案），我尝试连接以下变体的flyway.url字符串，没有成功：

flyway.url=jdbc:postgresql://:5432/mydb
flyway.url=jdbc:postgresql:///mydb
flyway.url=jdbc:postgresql://%2Fvar%2Flib%2Fpostgresql%2F.s.PGSQL.5432/mydb
flyway.url=jdbc:postgresql://%2Fvar%2Frun%2Fpostgresql%2F.s.PGSQL.5432/mydb
flyway.url=jdbc:postgresql://:5432/mydb?host=/var/run/postgresql
flyway.url=jdbc:postgresql:///mydb?host=/var/run/postgresql

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有没有人对如何配置JDBC URL有任何建议，以便我可以在初始化阶段连接flyway到postgresql？
谢谢你，谢谢