421 Service not available, remote server has closed connection

[Tibor Kiss]

Hi,

I try to use your image to create a simple FTP server on AKS (Azure Kubernetes). For the configuration I use the following documentation: http://dbaharrison.blogspot.com/2018/05/azure-aks-and-quest-for-paas-ftp-server.html

Unfortunately your image does not work there. When I try to connect to the FTP service I am facing the following issues:

1. Option : Command line
   • Login Command: ftp -p 21
   • Result220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
   • Command: dir
   • Result: 421 Service not available, remote server has closed connection. Passive mode refused.
2. Option: Total commander
   • Message flow:
     • 200 PORT command successfull
     • MLSD
     • PORT failde, try PASV mode!
     • PASV
3. Option: WinSCP
   • With defined root path: Can't change directory to /home/ftpusers/user: No such file or directory
   • Without define root path: Timeout detected. (data connection). Could not retrieve directory listing. Error listing directory '/'.

Kubernbetes version: 1.19.9

pure-ftp.aml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ftp5-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ftpuk
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: ftpuk
    spec:
      hostNetwork: true
      containers:
      - name: ftpuk
        image: stilliard/pure-ftpd:latest
        env:
        - name: ADDED_FLAGS
          value: -O w3c:/var/log/pure-ftpd/transfer.log
        ports:
        - containerPort: 21
        volumeMounts:
        - name: azuredisk
          mountPath: /home/ftpusers/
      volumes:
      - name: azuredisk
        persistentVolumeClaim:
          claimName: ftp-claim

Pod status:

NAME                               READY   STATUS    RESTARTS   AGE
ftp5-deployment-7bfd54c657-tqh6n   1/1     Running   0          20h

Could you please help me to use it on the right way?

Thanks in advance.

[Andrew Stilliard]

Hi @the1bit,

I don't know much about the azure docker format above but I notice you're not passing the PUBLICHOST.

Check out our docker compose as an example:
https://github.com/stilliard/docker-pure-ftpd/blob/master/docker-compose.yml

[Tibor Kiss]

It does not help. So I solved with ATMOZ SFTP. That works fine by default.