Unable to proceed with commands after connecting from client to server

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Kopia server has been set up in Docker on Debian according to Download & Installation | Kopia. It is exposed on 443 using TLS certificate through Nginx Proxy Manager and I’ve been able to successfully setup and connect a Windows 10 client which is successfully obeying its snapshot policy.

I’m now setting up a client using Docker on Debian. The authentication and handshake appears to succeed but the session ends immediately and the container restarts without error.

I wasn’t able to determine from the documentation whether additional commands need to be specified for a Docker client in order for it to sustain a session and execute tasks after connection, but it doesn’t appear to get past that stage.

Docker logs

kopia         | starting session for user "user@client" from 192.168.176.1:60086
kopia-client  | Connected to repository API Server.
kopia         | session ended for user "user@client" from 192.168.176.1:60086
kopia-client exited with code 0
kopia         | starting session for user "user@client" from 192.168.176.1:53858
kopia-client  | Connected to repository API Server.
kopia         | session ended for user "user@client" from 192.168.176.1:53858
kopia-client exited with code 0
kopia         | starting session for user "user@client" from 192.168.176.1:44040
kopia-client  | Connected to repository API Server.
kopia         | session ended for user "user@client" from 192.168.176.1:44040
kopia-client exited with code 0
kopia-client  | Connecting to server 'https://backup.example.com:443' as 'user@client'...
kopia         | starting session for user "user@client" from 192.168.176.1:59314
kopia-client  | Connected to repository API Server.
kopia         | session ended for user "user@client" from 192.168.176.1:59314

Docker Compose file (server)

  kopia:
    image: kopia/kopia:latest
    container_name: kopia
    restart: unless-stopped
    environment:
      - KOPIA_PASSWORD=${REPOSITORY_PWD}
      - TZ=${TIMEZONE}
    logging:
      options:
        max-size: 10m
    volumes:
      - ${DATA_ROOT}/kopia/config:/app/config
      - ${DATA_ROOT}/kopia/cache:/app/cache
      - ${DATA_ROOT}/kopia/logs:/app/logs
      - qnap-backup-kopia:/mnt/nfs
      - ${DATA_ROOT}/proxy/letsencrypt/live/npm-6/fullchain.pem:/certs/fullchain.pem:ro
      - ${DATA_ROOT}/proxy/letsencrypt/live/npm-6/privkey.pem:/certs/privkey.pem:ro # from NPM
    command:
        - server
        - start
        - --disable-csrf-token-checks
        - --tls-cert-file=/certs/fullchain.pem
        - --tls-key-file=/certs/privkey.pem
        - --address=0.0.0.0:51515
        - --server-username=${SERVER_USR}
        - --server-password=${SERVER_PWD}
        - --server-control-username=${SERVER_CTRL_USER}
        - --server-control-password=${SERVER_CTRL_PWD}
    ports:
      - 51515:51515

Docker compose file (client)

  kopia-client:
    image: kopia/kopia
    container_name: kopia-client
    restart: unless-stopped
    environment:
      - TZ=${TIMEZONE}
    command: >
      repository connect server --url=${SERVER_URL}
      --override-username=${CLIENT_USR} 
      --override-hostname=${CLIENT_HOST}
      --password=${CLIENT_PWD}
      --enable-actions
      && snapshot create
    logging:
      options:
        max-size: 10m
    volumes:
      - ${BACKUP_ROOT}:/backup_root

Any guidance around how to setup the client in Docker would be appreciated please.

I created an issue here Unable to proceed with commands after connecting from client to server · Issue #4091 · kopia/kopia · GitHub but my issue may be better as a discussion.