pg_dump运行rake db时出错：migrate

Question

我有postgres容器和一个ruby容器。当运行搬运工，撰写运行Web耙分贝：迁移我有这样的错误

rake aborted! 
failed to execute: 
pg_dump -s -x -O -f /usr/src/app/db/structure.sql --schema=public --schema=partitioning docker_rails_dev 

Please check the output above for any errors and make sure that `pg_dump` is installed in your PATH and has proper permissions. 

/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/tasks/postgresql_database_tasks.rb:90:in `run_cmd' 
/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/tasks/postgresql_database_tasks.rb:55:in `structure_dump' 
/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/tasks/database_tasks.rb:183:in `structure_dump' 
/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/railties/databases.rake:279:in `block (3 levels) in <top (required)>' 
/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/railties/databases.rake:53:in `block (2 levels) in <top (required)>' 
/usr/local/bundle/gems/activerecord-4.2.7.1/lib/active_record/railties/databases.rake:45:in `block (2 levels) in <top (required)>' 
Tasks: TOP => db:structure:dump 
(See full trace by running task with --trace) 

的pg_dump的命令是在Postgres的容器可用，但不是在红宝石容器，但我在docker-compose.yml文件联系在一起的他们。

Answer 1

简答：安装您需要的工具 - 插入容器，插入容器。

如果您需要在ruby容器内运行pg_dump，请在ruby容器中安装postgress。二进制文件很少以这种方式移植。