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backupdocker
Vanuan
Vanuan

Reputation: 33462

Docker: Run commands from multiple containers

I want to execute a command that uses commands from multiple containers.

E.g., I want to execute a backup script that used psql and pg_dump commands.

docker exec db_backup pg_dump
failed to exec: exec: "pg_dump": executable file not found in $PATH

docker run has an option --link. Is there a similar option for exec?

To clear this up, there are 3 containers:

I want to use pg commands located in db from my db_backup scripts.

Upvotes: 0

Views: 2325

Answers (2)

dukebody
dukebody

Reputation: 7195

There is not --link option for docker exec. If you want to backup using a special script:

  1. Create a new image db_backup starting from the postgresql one (the one that the db container uses), adding the backup script to some folder.
  2. Do docker run --volumes-from db db_backup your_backup_script.sh.

Upvotes: 1

Jiri Kremser
Jiri Kremser

Reputation: 12847

1) go to the db shell by using sudo docker run -ti db /bin/bash

2) type which pg_dump or locate pg_dump if the first fails

3) use the full path in your command sudo docker exec db /full_path_to/pg_dump

run the 3) inside your db container

note: on my Fedora the pg_dump points to /usr/bin/pg_dump

Upvotes: 0

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