如何确保 Express.js 应用程序容器和 PostgreSQL 容器与交互式终端交互工作？

问题描述 投票：0回答：1

我有一个 Express.js 应用程序，它从终端获取输入并将数据交互地输出到终端。对于数据存储，我使用 PostgreSQL。该应用程序需要交互运行，并且只能在 PostgreSQL 容器正常运行后启动。我正在使用 Docker Compose 来管理容器。

但是，我面临着容器运行顺序的问题。 Express.js 应用程序容器似乎试图在 PostgreSQL 容器准备就绪之前启动，从而导致连接错误。或者它无法交互工作。

如何配置 docker-compose.yml 文件以确保 Express.js 应用程序在启动之前等待 PostgreSQL 容器完全运行并在终端上以交互方式工作？

这是我的 docker-compose.yml 文件：

services:
  postgresdb:
    image: "postgres:latest"
    environment:
      - POSTGRES_USER=root
      - POSTGRES_PASSWORD=root
      - POSTGRES_DB=userinfo
    container_name: postgresqldb
    healthcheck:
      test: ["CMD", "pg_isready", "-U", "root", "-d", "userinfo"]
      interval: 10s
      timeout: 10s
      retries: 3

  app:
    build: .
    depends_on:
      postgresdb:
        condition: service_healthy
    stdin_open: true
    tty: true

我的 Dockerfile：

FROM node:20

WORKDIR /myapp

COPY . .

RUN npm install

EXPOSE 3000

CMD [ "npm", "start" ]

如果你觉得这个问题需要写代码我也会添加代码。

编辑后： 现在，它运行良好。但我输入后就卡在这里了

1
:

[+] Running 3/3
 ✔ Network bind-mounts_default  Created                                                                                                                                                           0.0s 
 ✔ Container postgresqldb       Created                                                                                                                                                           0.0s 
 ✔ Container bind-mounts-app-1  Created                                                                                                                                                           0.0s 
Attaching to bind-mounts-app-1, postgresqldb
postgresqldb       | The files belonging to this database system will be owned by user "postgres".
postgresqldb       | This user must also own the server process.
postgresqldb       | 
postgresqldb       | The database cluster will be initialized with locale "en_US.utf8".
postgresqldb       | The default database encoding has accordingly been set to "UTF8".
postgresqldb       | The default text search configuration will be set to "english".
postgresqldb       | 
postgresqldb       | Data page checksums are disabled.
postgresqldb       | 
postgresqldb       | fixing permissions on existing directory /var/lib/postgresql/data ... ok
postgresqldb       | creating subdirectories ... ok
postgresqldb       | selecting dynamic shared memory implementation ... posix
postgresqldb       | selecting default max_connections ... 100
postgresqldb       | selecting default shared_buffers ... 128MB
postgresqldb       | selecting default time zone ... Etc/UTC
postgresqldb       | creating configuration files ... ok
postgresqldb       | running bootstrap script ... ok
postgresqldb       | performing post-bootstrap initialization ... ok
postgresqldb       | initdb: warning: enabling "trust" authentication for local connections
postgresqldb       | initdb: hint: 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.
postgresqldb       | syncing data to disk ... ok
postgresqldb       | 
postgresqldb       | 
postgresqldb       | Success. You can now start the database server using:
postgresqldb       | 
postgresqldb       |     pg_ctl -D /var/lib/postgresql/data -l logfile start
postgresqldb       | 
postgresqldb       | waiting for server to start....2024-08-01 14:14:30.694 UTC [48] LOG:  starting PostgreSQL 16.3 (Debian 16.3-1.pgdg120+1) on aarch64-unknown-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
postgresqldb       | 2024-08-01 14:14:30.694 UTC [48] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgresqldb       | 2024-08-01 14:14:30.696 UTC [51] LOG:  database system was shut down at 2024-08-01 14:14:30 UTC
postgresqldb       | 2024-08-01 14:14:30.699 UTC [48] LOG:  database system is ready to accept connections
postgresqldb       |  done
postgresqldb       | server started
postgresqldb       | CREATE DATABASE
postgresqldb       | 
postgresqldb       | 
postgresqldb       | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
postgresqldb       | 
postgresqldb       | waiting for server to shut down...2024-08-01 14:14:30.851 UTC [48] LOG:  received fast shutdown request
postgresqldb       | .2024-08-01 14:14:30.853 UTC [48] LOG:  aborting any active transactions
postgresqldb       | 2024-08-01 14:14:30.855 UTC [48] LOG:  background worker "logical replication launcher" (PID 54) exited with exit code 1
postgresqldb       | 2024-08-01 14:14:30.855 UTC [49] LOG:  shutting down
postgresqldb       | 2024-08-01 14:14:30.855 UTC [49] LOG:  checkpoint starting: shutdown immediate
postgresqldb       | 2024-08-01 14:14:30.881 UTC [49] LOG:  checkpoint complete: wrote 922 buffers (5.6%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.011 s, sync=0.014 s, total=0.026 s; sync files=301, longest=0.004 s, average=0.001 s; distance=4255 kB, estimate=4255 kB; lsn=0/1911FA0, redo lsn=0/1911FA0
postgresqldb       | 2024-08-01 14:14:30.886 UTC [48] LOG:  database system is shut down
postgresqldb       |  done
postgresqldb       | server stopped
postgresqldb       | 
postgresqldb       | PostgreSQL init process complete; ready for start up.
postgresqldb       | 
postgresqldb       | 2024-08-01 14:14:30.968 UTC [1] LOG:  starting PostgreSQL 16.3 (Debian 16.3-1.pgdg120+1) on aarch64-unknown-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
postgresqldb       | 2024-08-01 14:14:30.969 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
postgresqldb       | 2024-08-01 14:14:30.969 UTC [1] LOG:  listening on IPv6 address "::", port 5432
postgresqldb       | 2024-08-01 14:14:30.970 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgresqldb       | 2024-08-01 14:14:30.973 UTC [64] LOG:  database system was shut down at 2024-08-01 14:14:30 UTC
postgresqldb       | 2024-08-01 14:14:30.976 UTC [1] LOG:  database system is ready to accept connections
bind-mounts-app-1  | 
bind-mounts-app-1  | > [email protected] start
bind-mounts-app-1  | > node app.js
bind-mounts-app-1  | 

bind-mounts-app-1  | Choose an option:
bind-mounts-app-1  | 1. Add a name to the DB
bind-mounts-app-1  | 2. Get all names from the DB
bind-mounts-app-1  | 3. Quit
bind-mounts-app-1  | 
Enter your choice: Server is running on http://localhost:3000
1
postgresqldb       | 2024-08-01 14:19:31.073 UTC [62] LOG:  checkpoint starting: time
postgresqldb       | 2024-08-01 14:19:35.393 UTC [62] LOG:  checkpoint complete: wrote 45 buffers (0.3%); 0 WAL file(s) added, 0 removed, 0 recycled; write=4.306 s, sync=0.006 s, total=4.320 s; sync files=12, longest=0.005 s, average=0.001 s; distance=261 kB, estimate=261 kB; lsn=0/19533D8, redo lsn=0/19533A0
docker express docker-compose terminal dockerfile
1个回答
0
投票

您已将对 postgres 容器的依赖设置为 

service_completed_successfully
，但 postgres 永远不会“完成”（它是一个持久服务）。您应该改用 
service_healthy
依赖项：

services:
  postgresdb:
    image: "postgres:latest"
    environment:
      - POSTGRES_USER=root
      - POSTGRES_PASSWORD=root
      - POSTGRES_DB=userinfo
    container_name: postgresqldb
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U root -d userinfo"]
      timeout: 20s
      retries: 10

  app:
    build: .
    depends_on:
      postgresdb:
        condition: service_healthy
    stdin_open: true
    tty: true

请参阅“在 Compose 中控制启动和关闭顺序””以获取完整文档。

您可能想稍微调整一下您的健康检查； 

interval
值默认为 30 秒，因此您必须至少等待那么长时间容器才能正常运行。另外，除非您有运行 shell 脚本的特定需要，否则优先选择 
CMD
而不是 
CMD-SHELL
。这样的事情也许更合理：

services:
  postgresdb:
    image: "postgres:latest"
    environment:
      - POSTGRES_USER=root
      - POSTGRES_PASSWORD=root
      - POSTGRES_DB=userinfo
    container_name: postgresqldb
    healthcheck:
      test: ["CMD", "pg_isready", "-U", "root", "-d", "userinfo"]
      interval: 10s
      timeout: 10s
      retries: 3

  app:
    build: .
    depends_on:
      postgresdb:
        condition: service_healthy
    stdin_open: true
    tty: true
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