Docker-compose MemoryError

Question

I try to launch odoo on vps with 512 Mb RAM. I use docker. When I launch containers with plain docker everything is fine. I launch like that: postgres container:

docker run -d -e POSTGRES_USER=odoo -e POSTGRES_PASSWORD=odoo --name db postgres

odoo container:

docker run -p 8069:8069 --name odoo --link db:db -t odoo

No errors, everything is working fine. Then I shutdown, remove this containers and try to do same thing with docker-compose:

app:
    image: odoo
    tty: true
    ports:
        - "8069:8069"
    volumes:
        - ./addons:/mnt/extra-addons:ro,Z
    links:
        - db:db

db:
    image: postgres
    environment:
        POSTGRES_USER: odoo
        POSTGRES_PASSWORD: odoo

And when I launch I get MemoryError:

root@ubuntu-512mb-fra1-01:~/odoo# docker-compose -f odoo.yml up
Creating odoo_db_1
Creating odoo_app_1
Attaching to odoo_db_1, odoo_app_1
db_1   | The files belonging to this database system will be owned by user "postgres".
db_1   | This user must also own the server process.
db_1   | 
db_1   | The database cluster will be initialized with locale "en_US.utf8".
db_1   | The default database encoding has accordingly been set to "UTF8".
db_1   | The default text search configuration will be set to "english".
db_1   | 
db_1   | Data page checksums are disabled.
db_1   | 
db_1   | fixing permissions on existing directory /var/lib/postgresql/data ... ok
db_1   | creating subdirectories ... ok
db_1   | selecting default max_connections ... 100
db_1   | selecting default shared_buffers ... 128MB
db_1   | selecting dynamic shared memory implementation ... posix
db_1   | creating configuration files ... ok
Traceback (most recent call last):
  File "/usr/local/bin/docker-compose", line 9, in <module>
    load_entry_point('docker-compose==1.9.0', 'console_scripts', 'docker-compose')()
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 65, in main
    command()
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 117, in perform_command
    handler(command, command_options)
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 862, in up
    log_printer.run()
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/log_printer.py", line 87, in run
    for line in consume_queue(queue, self.cascade_stop):
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/log_printer.py", line 229, in consume_queue
    raise item.exc
MemoryError

I tried to google the reason, but couldn't find anything.

Answer 1

The command that is being run buffers json so that it can split it correctly. It's possible that buffering is using up too much memory.

You could try this instead:

docker-compose -f odoo.yml up -d 

That will run "detached". You can still try running docker-compose logs to see the logs.