我想在postgres映像中使用psql以便在数据库上运行一些查询。但是不幸的是，当我连接到postgres容器时，出现了该错误，找不到psql命令…

对我来说，如何在容器中运行postgre sql查询或命令是一个谜。

如何在postgres容器中运行psql命令？（我是Docker世界中的新手）

我使用Ubuntu作为主机，但没有在主机上安装postgres，而是使用postgres容器。

docker-compose ps
        Name                       Command               State               Ports            
---------------------------------------------------------------------------------------------
yiialkalmi_app_1        /bin/bash                        Exit 0                               
yiialkalmi_nginx_1      nginx -g daemon off;             Up       443/tcp, 0.0.0.0:80->80/tcp 
yiialkalmi_php_1        php-fpm                          Up       9000/tcp                    
yiialkalmi_postgres_1   /docker-entrypoint.sh postgres   Up       5432/tcp                    
yiialkalmi_redis_1      docker-entrypoint.sh redis ...   Up       6379/tcp

这里的容器：

docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                         NAMES
315567db2dff        yiialkalmi_nginx    "nginx -g 'daemon off"   18 hours ago        Up 3 hours          0.0.0.0:80->80/tcp, 443/tcp   yiialkalmi_nginx_1
53577722df71        yiialkalmi_php      "php-fpm"                18 hours ago        Up 3 hours          9000/tcp                      yiialkalmi_php_1
40e39bd0329a        postgres:latest     "/docker-entrypoint.s"   18 hours ago        Up 3 hours          5432/tcp                      yiialkalmi_postgres_1
5cc47477b72d        redis:latest        "docker-entrypoint.sh"   19 hours ago        Up 3 hours          6379/tcp                      yiialkalmi_redis_1

这是我的docker-compose.yml：

app:
image: ubuntu:16.04
volumes:
    - .:/var/www/html

nginx:
    build: ./docker/nginx/
    ports:
        - 80:80
    links:
        - php
    volumes_from:
        - app
    volumes:
        - ./docker/nginx/conf.d:/etc/nginx/conf.d

php:
    build: ./docker/php/
    expose:
        - 9000
    links:
        - postgres
        - redis
    volumes_from:
        - app

postgres:
    image: postgres:latest
    volumes:
        - /var/lib/postgres
    environment:
        POSTGRES_DB: project
        POSTGRES_USER: project
        POSTGRES_PASSWORD: project

redis:
    image: redis:latest
    expose:
        - 6379