无法连接到在 docker 中运行的 postgres

Question

我在 Docker 中启动了 Postgres。它工作正常。我通过 bash 进入 docker 容器并检查 DB 是否正常工作。 目标是将它与没有 spring boot 的应用程序 spring mvc 连接起来。 如果我理解正确，问题在于与 Postgres 的连接。 该应用程序无法连接到 id。如何解决？ 该应用程序构建并正确启动。获取请求工作正常，但是当我尝试发布时它没有工作。

我尝试使用两种不同的数据源： 如果我发帖，我会在浏览器中看到错误：

1.

@Bean
public DataSource dataSource() {
    DriverManagerDataSource driver = new DriverManagerDataSource();
    driver.setDriverClassName("org.postgresql.Driver");
    driver.setUrl("jdbc:postgresql://localhost:6000/users");
    driver.setUsername("postgres");
    driver.setPassword("task1");
    return driver;
}

错误是：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

1. @Bean
   public DataSource dataSource() throws PropertyVetoException {
       ComboPooledDataSource driver = new ComboPooledDataSource();
       driver.setDriverClass("org.postgresql.Driver");
       driver.setJdbcUrl("jdbc:postgresql://localhost:6000/users");
       driver.setUser("postgres");
       driver.setPassword("task1");
       return driver;
   }
   

应用启动时我在控制台中看到此错误：

17-Apr-2020 19:26:58.016 WARNING [C3P0PooledConnectionPoolManager[identityToken->z8kfsxa912030ejmgd6af|6144d891]-HelperThread-#2] com.mchange.v2.resourcepool.BasicResourcePool. Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@46e95772 is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
17-Apr-2020 19:26:58.011 WARNING [C3P0PooledConnectionPoolManager[identityToken->z8kfsxa912030ejmgd6af|6144d891]-HelperThread-#1] com.mchange.v2.resourcepool.BasicResourcePool. com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@628b9aa1 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 
    org.postgresql.util.PSQLException: The connection attempt failed.

标准 Docker 文件：

FROM postgres

ENV POSTGRES_USER task1
ENV POSTGRES_PASSWORD task1
ENV POSTGRES_DB users

和 docker-compose：

version: "3.7"
services:
  postgres:
    build:
      context: .
      dockerfile: db.Dockerfile
    image: postgrei
    container_name: DB
    ports:
    - 6000:6000

其他代码：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories("com.repository")
@ComponentScan(basePackages = "com.task1")
public class DataJpaConfig {



    @Bean
    public DataSource dataSource() throws PropertyVetoException {
        ComboPooledDataSource driver = new ComboPooledDataSource();
        driver.setDriverClass("org.postgresql.Driver");
        driver.setJdbcUrl("jdbc:postgresql://localhost:6000/users");
        driver.setUser("postgres");
        driver.setPassword("task1");
        return driver;
    }


    @Bean
    public PlatformTransactionManager transactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Bean
    public JpaVendorAdapter jpaVendorAdapter() {
        return new HibernateJpaVendorAdapter();
    }

    @Bean
    public Properties hibernateProperties() {
        Properties hibernateProp = new Properties();
        hibernateProp.put("hibernate.dialect",
                "org.hibernate.dialect.PostgreSQL95Dialect");
        hibernateProp.put("hibernate.format sql", true);
        hibernateProp.put("hibernate.use sql comments", true);
        hibernateProp.put("hibernate.show_sql", true);
        hibernateProp.put("hibernate.max_fetch_depth", 3);
        hibernateProp.put("hibernate.jdbc.batch_size", 10);
        hibernateProp.put("hibernate.jdbc.fetch_size", 50);
        return hibernateProp;
    }

    @Bean
    public EntityManagerFactory entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean factoryBean =
        new LocalContainerEntityManagerFactoryBean();
        factoryBean.setPackagesToScan(
                "com.task1");
        try {
            factoryBean.setDataSource(dataSource());
        } catch (PropertyVetoException e) {
            e.printStackTrace();
        }
        factoryBean.setJpaVendorAdapter(
                new HibernateJpaVendorAdapter());
        factoryBean.setJpaProperties(hibernateProperties());
        factoryBean.setJpaVendorAdapter(jpaVendorAdapter());
        factoryBean.afterPropertiesSet();
        return factoryBean.getNativeEntityManagerFactory();
    }

}


public class ApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{DataJpaConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{ApplicationConfiguration.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}


@Configuration
@EnableWebMvc
@EnableTransactionManagement
@ComponentScan(basePackages = "com.task1")
public class ApplicationConfiguration implements WebMvcConfigurer {}

来自 docker 容器的日志：

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgresql/data ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default time zone ... Etc/UTC
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok


Success. You can now start the database server using:

    pg_ctl -D /var/lib/postgresql/data -l logfile start

initdb: warning: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
waiting for server to start....2020-04-17 16:17:52.683 UTC [47] LOG:  starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-04-17 16:17:52.684 UTC [47] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-04-17 16:17:52.698 UTC [48] LOG:  database system was shut down at 2020-04-17 16:17:50 UTC
2020-04-17 16:17:52.702 UTC [47] LOG:  database system is ready to accept connections
 done
server started
CREATE DATABASE


/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/createUserTable.sql
CREATE TABLE


/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/putDataToUserTable.sql
INSERT 0 3


waiting for server to shut down...2020-04-17 16:17:53.317 UTC [47] LOG:  received fast shutdown request
.2020-04-17 16:17:53.332 UTC [47] LOG:  aborting any active transactions
2020-04-17 16:17:53.335 UTC [47] LOG:  background worker "logical replication launcher" (PID 54) exited with exit code 1
2020-04-17 16:17:53.335 UTC [49] LOG:  shutting down
2020-04-17 16:17:53.407 UTC [47] LOG:  database system is shut down
 done
server stopped

PostgreSQL init process complete; ready for start up.

2020-04-17 16:17:53.431 UTC [1] LOG:  starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-04-17 16:17:53.432 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2020-04-17 16:17:53.432 UTC [1] LOG:  listening on IPv6 address "::", port 5432
2020-04-17 16:17:53.441 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-04-17 16:17:53.454 UTC [83] LOG:  database system was shut down at 2020-04-17 16:17:53 UTC
2020-04-17 16:17:53.458 UTC [1] LOG:  database system is ready to accept connections

Answer 1

问题出在您的 docker-compose.yml 文件中。 您需要映射数据库端口。 将端口从 6000:6000 更改为 6000:5432 然后 docker-compose down 和 docker-compose up。