Pure-FTPD doesn't start - [ERROR] Unable to switch capabilities

Please fill in any relevant information that applies to you:

• CentOS Version: CentOS 7.3 64bit
• Centmin Mod Version Installed: Centmin Mod 1.2.3-eva2000.08
• Nginx Version Installed: nginx/1.11.10
• PHP Version Installed: PHP 5.5.38
• MariaDB MySQL Version Installed: 10.0.30
• When was last time updated Centmin Mod code base ? : 1st April 2017
• Persistent Config: cat: /etc/centminmod/custom_config.inc: No such file or directory
  

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  Steps to reproduce:

1. Install Centminmod
2. Add vhost (option 2)
3. Create FTP user with auto-generated password
4. Attempt to log in with FTP user - no success
5. Pure-ftpd daemon failed to start:

Code:

# systemctl status pure-ftpd.service
● pure-ftpd.service - Pure-FTPd FTP server
   Loaded: loaded (/usr/lib/systemd/system/pure-ftpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sun 2017-04-02 20:46:43 UTC; 5s ago
  Process: 22614 ExecStart=/usr/sbin/pure-config.pl /etc/pure-ftpd/pure-ftpd.conf --daemonize (code=exited, status=252)

Apr 02 20:46:43 hostname systemd[1]: Starting Pure-FTPd FTP server...
Apr 02 20:46:43 hostname systemd[1]: pure-ftpd.service: control process exited, code=exited status=252
Apr 02 20:46:43 hostname systemd[1]: Failed to start Pure-FTPd FTP server.
Apr 02 20:46:43 hostname systemd[1]: Unit pure-ftpd.service entered failed state.
Apr 02 20:46:43 hostname systemd[1]: pure-ftpd.service failed.

 

I just re-imaged to Centos 6.8 (to confirm if the same behaviour exists there), installed the same version of Centminmod and found this in the installer output:

Code:

Check pure-ftpd Version:
--------------------------------------------------------
421 Unable to switch capabilities : Operation not permitted

Code:

# grep pure /var/log/messages
Apr  2 17:58:49 hostname yum[7805]: Installed: pure-ftpd-1.0.30-1.el6.x86_64
Apr  2 17:58:54 hostname pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
Apr  2 17:59:29 hostname pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
Apr  2 18:06:59 hostname pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted

I will try re-imaging back to 7.3 in the AM and get more verbose log output (googling the pure-ftpd config parameters currently).

 

It's a container image running atop Proxmox which coincidentally is OVH (is this level of abstraction still relevant?)

Image version: centos-6-default_20161207_amd64.tar.xz (yum updated prior to Centminmod install)

 

Confirmed - the OVH kernel does appear to have been the issue. Thread can be marked as solved.

It would've been too disruptive to re-install a different kernel on the host, so I span up an entire guest VM with its own kernel to work around.

Thank you for your help!