Signal K•2mo ago

What's the sudo password for the Docker container?

I would like to try to ping the 192.168.3.2 from the Docker image of SK, but I can't install ping utils because I need the sudo password. Can somebody please tell me what that is?

6 Replies

Teppo Kurki•2mo ago

i don't think sudo is available, not a question of knowing the password

Mastiff•2mo ago

I see. I managed to do it by using a bit of extra code building the image:

    build:
      dockerfile_inline: | 
        FROM  cr.signalk.io/signalk/signalk-server:latest
        USER root
        RUN apt-get update \
          && apt-get install -y --no-install-recommends iputils-ping sshpass openssh-client
        USER node

    build:
      dockerfile_inline: | 
        FROM  cr.signalk.io/signalk/signalk-server:latest
        USER root
        RUN apt-get update \
          && apt-get install -y --no-install-recommends iputils-ping sshpass openssh-client
        USER node

(The SSH stuff wasn't necessary, but I already had that in another Docker Compose file for Node-RED). Turns out that pinging does not work in Bridge mode:

pi@MadMax:/media/pi/Docker/Docker-Compose/SignalK $ docker exec -it SignalK sh
$ ping 192.168.3.2
PING 192.168.3.2 (192.168.3.2) 56(84) bytes of data.
From 172.17.0.1 icmp_seq=1 Destination Port Unreachable

pi@MadMax:/media/pi/Docker/Docker-Compose/SignalK $ docker exec -it SignalK sh
$ ping 192.168.3.2
PING 192.168.3.2 (192.168.3.2) 56(84) bytes of data.
From 172.17.0.1 icmp_seq=1 Destination Port Unreachable

So that explains a bit of the problem we spoke about with GPSD.

Teppo Kurki•2mo ago

well, too bad it does not really give much if any more information - it also fails does pinging 1.1.1.1 for example work?

Mastiff•2mo ago

Yeah, that works.

Teppo Kurki•2mo ago

does your machine have anything special related to routing or firewalls?

Mastiff•2mo ago

It's a Pi 4 set up as 192.168.3.1, to be a router, but the routing is to get from the boat's 192.168.3.x network to my cabin's 192.168.2.x network. Routing is set up in Network Manager, with wifi in and LAN out from Pi 192.168.3.1 to Pi 192.168.3.2. Pi 192.168.3.2 is running as an access point forp hones, tablet and a bunch of ESP32's in the boat. As far as I know there is no firewall active. At least I haven't installed one. I can't ping the ESP32's either, they are on 192.168.3.100 and up. So the Pi with GPSD and the Pi with SignalKL are on the same segment, connected by a LAN cable.

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What's the sudo password for the Docker container?