Docker operations on a remote context over ssh fail randomly with ssh error 255 No such host is known

General Discussions
1 
C:\YADAMU>docker context ls
NAME                TYPE                DESCRIPTION                               DOCKER ENDPOINT
      KUBERNETES ENDPOINT   ORCHESTRATOR
default             moby                Current DOCKER_HOST based configuration   npipe:////./pipe/docker_engine

desktop-linux       moby                Docker Desktop                            npipe:////./pipe/dockerDesktopLinuxEngine
yadamu-db1 *        moby                                                          ssh://yadamu@yadamu-db1


C:\YADAMU>docker exec -it ORA1903-01 mkdir -p /tmp/foo

C:\YADAMU>docker exec -it ORA1903-01 mkdir -p /tmp/foo
command [ssh -o ConnectTimeout=30 -l yadamu -- yadamu-db1 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: stderr=ssh: Could not resolve hostname yadamu-db1: No such host is known.

C:\YADAMU>
C:\YADAMU>docker exec -it ORA1903-01 mkdir -p /tmp/foo

C:\YADAMU>docker exec -it ORA1903-01 mkdir -p /tmp/foo
command [ssh -o ConnectTimeout=30 -l yadamu -- yadamu-db1 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: stderr=ssh: Could not resolve hostname yadamu-db1: No such host is known.


C:\YADAMU>

I can ssh without issues

C:\YADAMU>ssh yadamu@yadamu-db1
Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.17.0-1019-oem x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Sun Oct  1 07:29:34 PM UTC 2023

  System load:                      0.3447265625
  Usage of /:                       11.8% of 1.79TB
  Memory usage:                     11%
  Swap usage:                       12%
  Temperature:                      75.0 C
  Processes:                        985
  Users logged in:                  0
  IPv4 address for br-57adaa1c0b26: 172.19.0.1
  IPv4 address for docker0:         172.17.0.1
  IPv4 address for enp91s0:         192.168.1.230

 * Strictly confined Kubernetes makes edge and IoT secure. Learn how MicroK8s
   just raised the bar for easy, resilient and secure K8s cluster deployment.

   https://ubuntu.com/engage/secure-kubernetes-at-the-edge

Expanded Security Maintenance for Applications is not enabled.

0 updates can be applied immediately.

16 additional security updates can be applied with ESM Apps.
Learn more about enabling ESM Apps service at https://ubuntu.com/esm

Docker commands are being run on Windows 11

Server Version is

yadamu@yadamu-db1:~$ docker -v
Docker version 24.0.6, build ed223bc
yadamu@yadamu-db1:~$

Client Version is

C:\YADAMU>docker -v
Docker version 24.0.6, build ed223bc

C:\YADAMU>

I am seeing this problem from two seperate windows clients trying to work with 2 seperate linux servers. The Server Side SSH logs show an open without a corresponding close when the error occurs. When the error does not occur the ssh log shows each open opeation has a corresponding close.

2

I tried installing docker-cli under ubuntu-20.04 on my windows machine and saw the same issues

mark_d_drake@MDRAKE-SURFACE:~$ docker exec -it ORA1903-01 mkdir /tmp/baa
mark_d_drake@MDRAKE-SURFACE:~$ docker exec -it ORA1903-01 mkdir /tmp/baa
command [ssh -o ConnectTimeout=30 -l yadamu -- yadamu-db1 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: stderr=ssh: Could not resolve hostname yadamu-db1: Name or service not known

mark_d_drake@MDRAKE-SURFACE:~$ docker exec -it ORA1903-01 mkdir /tmp/baa
command [ssh -o ConnectTimeout=30 -l yadamu -- yadamu-db1 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: stderr=ssh: Could not resolve hostname yadamu-db1: Name or service not known

mark_d_drake@MDRAKE-SURFACE:~$ docker exec -it ORA1903-01 mkdir /tmp/baa
mkdir: cannot create directory '/tmp/baa': File exists
mark_d_drake@MDRAKE-SURFACE:~$
3

If I execute the command on the server it works every time. SSH configuration Issue ?