Re: [LMDB] mdb_open throws ENOSYS in Linux container on OS X host

stefano@cossu.cc wrote:

Hello, I am running Docker on OS X Monterey, and starting up a vanilla alpine:latest Linux image. I only installed build-base and lmdb-dev and ran /bin/sh as root.

LMDB version (Alpine): lmdb-dev-0.9.33-r0

Inside the container, I wrote this test code:

I compiled with `gcc test_open.c -llmdb -o test_open` and ran as root, and got this output:

env create: 0 env set maxdbs: 0 env set mapsize: 0 env open: 38

The lock file was created, not the data file.

This only occurs in the guest setup. On the OS X host and on a native Linux host it exits with 0.

Any hints?

Most likely, the default filesystem in your docker image doesn't support mmap().