Vsftpd LXC ERR500

VSFTPD in container list error 500

When running VSFTPD in a container (LXC here, did not try on Docker), default configuration makes directory listing unavailable.
Listing directory content generate an Error 500:

$ lftp ftp://192.168.99.58/os/
cd ok, cwd=/os
lftp 192.168.99.58:/os> ls
ls: Fatal error: 500 OOPS: 

This is due to the fact VSFTPD use "seccomp" (well, dont ask what it is: I dont know)

In order to work arround, I just had to add this line to the VSFTPD configuration:

seccomp_sandbox=NO

There are many references to this, no need for me to be anotehre reference, I just wrote this article as a reminder for myself:

• https://bugs.launchpad.net/serverguide/+bug/1302096
• https://www.linuxquestions.org/questions/gentoo-87/vsftpd-error-500-vsf_sysutil_bind-priv_sock_get_int-priv_sock_get_cmd-4175436938/
• https://technologytales.com/2013/09/21/turning-off-seccomp-sandbox-in-vsftpd/