【发布时间】：2020-09-10 04:54:58
【问题描述】：
我正在使用 docker、postgreSQL、NodeJS 和 redis 创建一个简单的 webapp。节点 API 正在与 redis 服务器连接，但未与 postgreeSQL 连接。 Redis 和 postgreSQL 都是 docker-compose 中使用的服务，并且设置了所有环境变量。
下面是docker-compose.yml：
version: '3'
services:
db:
image: 'postgres:latest'
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres_password
- POSTGRES_DB=postgres
redis:
image: 'redis:latest'
nginx:
restart: always
build:
dockerfile: Dockerfile.dev
context: ./nginx
ports:
- '4000:80'
api:
build:
dockerfile: Dockerfile.dev
context: ./server
volumes:
- /app/node_modules
- ./server:/app
environment:
- REDIS_HOST=redis
- REDIS_PORT=6379
- PGUSER=postgres
- PGHOST=db
- PGDATABASE=postgres
- PGPASSWORD=postgres_password
- PGPORT=5432
client:
build:
dockerfile: Dockerfile.dev
context: ./client
volumes:
- /app/node_modules
- ./client:/app
worker:
build:
dockerfile: Dockerfile.dev
context: ./worker
environment:
- REDIS_HOST=redis
- REDIS_PORT=6379
volumes:
- /app/node_modules
- ./worker:/app
节点 API index.js 文件：
const keys = require('./keys');
// Express App Setup
const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const app = express();
app.use(cors());
app.use(bodyParser.json());
// Postgres Client Setup
const { Pool } = require('pg');
const pgClient = new Pool({
user: keys.pgUser,
host: keys.pgHost,
database: keys.pgDatabase,
password: keys.pgPassword,
port: keys.pgPort
});
pgClient.on('error', () => console.log('Lost PG connection'));
pgClient
.query('CREATE TABLE IF NOT EXISTS values (number INT)', (err, res) => {
if (!err) {
console.log("TABLE CREATES SUCCESSFULLY", res);
}
else {
console.log(err)
}
})
// Redis Client Setup
const redis = require('redis');
const redisClient = redis.createClient({
host: keys.redisHost,
port: keys.redisPort,
retry_strategy: () => 1000
});
const redisPublisher = redisClient.duplicate();
// Express route handlers
console.log("INSIDE EXPRESS");
pgClient.query('SELECT NOW() as now', (err, res) => {
if (err) {
console.log("ERROR STACK", err.stack)
} else {
console.log("RESULT STACK", res.rows[0])
}
})
app.get('/', (req, res) => {
res.send('Hi');
});
app.get('/values/all', async (req, res) => {
const values = await pgClient.query('SELECT * FROM values');
// const values = [1, 2, 3, 4];
res.status(200).send(values);
});
app.get('/values/current', async (req, res) => {
redisClient.hgetall('values', (err, values) => {
res.send(values);
});
});
app.post('/values', async (req, res) => {
const index = req.body.index;
if (parseInt(index) > 40) {
return res.status(422).send('Index too high');
}
redisClient.hset('values', index, 'Nothing yet!');
redisPublisher.publish('insert', index);
pgClient.query('INSERT INTO values(number) VALUES($1)', [index]);
res.send({ working: true });
});
app.listen(5000, err => {
console.log('Listening');
});
还有，用于 API 的 DockerFile.dev：
FROM node:alpine
WORKDIR '/app'
COPY ./package.json ./
RUN npm install
COPY . .
CMD ["npm", "run", "dev"]
我正在使用 nginx 将 docker-compose 连接到外部世界，它工作得非常好。 API 正在响应 Redis 服务器，因此 API 连接没有故障。 postgreSQL 的结果（日志）如下所示：
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
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.
Success. You can now start the database server using:
pg_ctl -D /var/lib/postgresql/data -l logfile start
waiting for server to start....2020-05-23 09:20:15.804 UTC [46] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-05-23 09:20:15.818 UTC [46] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-05-23 09:20:16.031 UTC [47] LOG: database system was shut down at 2020-05-23 09:20:12 UTC
2020-05-23 09:20:16.141 UTC [46] LOG: database system is ready to accept connections
done
server started
/usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
2020-05-23 09:20:16.205 UTC [46] LOG: received fast shutdown request
waiting for server to shut down....2020-05-23 09:20:16.222 UTC [46] LOG: aborting any active transactions
2020-05-23 09:20:16.229 UTC [46] LOG: background worker "logical replication launcher" (PID 53) exited with exit code 1
2020-05-23 09:20:16.243 UTC [48] LOG: shutting down
2020-05-23 09:20:16.397 UTC [46] LOG: database system is shut down
server stopped
PostgreSQL init process complete; ready for start up.
2020-05-23 09:20:16.706 UTC [1] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-05-23 09:20:16.719 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
2020-05-23 09:20:16.724 UTC [1] LOG: listening on IPv6 address "::", port 5432
2020-05-23 09:20:16.752 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-05-23 09:20:16.853 UTC [55] LOG: database system was shut down at 2020-05-23 09:20:16 UTC
2020-05-23 09:20:16.980 UTC [1] LOG: database system is ready to accept connections
2020-05-23 09:38:08.005 UTC [1] LOG: received smart shutdown request
2020-05-23 09:38:08.708 UTC [1] LOG: background worker "logical replication launcher" (PID 61) exited with exit code 1
2020-05-23 09:38:08.796 UTC [56] LOG: shutting down
2020-05-23 09:38:10.440 UTC [1] LOG: database system is shut down
PostgreSQL Database directory appears to contain a database; Skipping initialization
2020-05-23 09:55:51.503 UTC [1] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-05-23 09:55:51.513 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
2020-05-23 09:55:51.513 UTC [1] LOG: listening on IPv6 address "::", port 5432
2020-05-23 09:55:51.558 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-05-23 09:55:52.114 UTC [25] LOG: database system was shut down at 2020-05-23 09:38:09 UTC
2020-05-23 09:55:52.190 UTC [1] LOG: database system is ready to accept connections
可以看出，数据库也运行良好，我可以使用 docker cli 与它进行交互。
但我不知道为什么 pgClient 在 Node API 中不起作用。
我已经提供了有关问题的所有详细信息，如果需要其他任何信息，请告诉我。
希望在这里得到一些帮助。
谢谢
【问题讨论】：
-
可能您的 nodejs 应用程序在完全初始化之前尝试连接到 db。见controlling the startup order
-
检查了但没用，我用 mongoDB 也试过了，效果很好。
标签： node.js postgresql docker docker-compose