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Knowledge Base

Dovecot fails to start after upgrade to Plesk 17.8 on Proxmox: Failed at step NAMESPACE spawning /usr/bin/doveadm: Invalid argument

 
debiandovecotmailplesk 17 8plesk onyx 17 8

Symptoms

  1. Apparmor is not installed:

    # aa-status
    apparmor module is not loaded.

  2. Plesk is running on Debian/Ubuntu in Proxmox virtual environment: 

    # plesk bin server_pref --get-server-info 2>&1 | grep virtual
    "virtualization": "lxc",

  3. Dovecot fails to start after upgrade to Plesk 17.8: 

    Active: failed (Result: exit-code) since Mon 2018-04-23 11:59:33 CEST; 2s ago
    Docs: man:dovecot(1)
    http://wiki2.dovecot.org/
    Process: 11856 ExecStop=/usr/bin/doveadm stop (code=exited, status=226/NAMESPACE)
    Process: 11855 ExecStart=/usr/sbin/dovecot -F (code=exited, status=226/NAMESPACE)

  4. The following error is logged to journald:

    # journalctl -f
    systemd[11361]: dovecot.service: Failed at step NAMESPACE spawning /usr/bin/doveadm: Invalid argument

Cause

Unclear.

Resolution

  1. Connect to Plesk server via SSH

  2. Create the directory for drop-in configuration:

    # mkdir /lib/systemd/system/dovecot.service.d/

  3. Create /lib/systemd/system/dovecot.service.d/pleskfix.conf file with the override configuration:

    [Service]
    PrivateTmp=false
    ProtectSystem=false
    PrivateDevices=false
    NoNewPrivileges=false

  4. Reload systemD services:

    # systemctl daemon-reload

  5. Start the Dovecot service:

    # systemctl start dovecot

Additional information

If Apparmor is used, check this article.

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