Connect via ssh to a minikube node

minikube ssh connect node

3 min read | by Jordi Prats

minikube is a great tool for testing: For some activities we might need to access via ssh to the kubernetes nodes, minikube even provides a command to do it so we don't even have to break a sweat

Using the minikube ssh we can connect to the node of an existing minikube cluster:

$ minikube ssh docker@minikube:~$ ps auxf USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.4 0.0 21860 11244 ? Ss 15:52 0:00 /sbin/init root 179 0.1 0.0 28948 12048 ? S<s 15:53 0:00 /lib/systemd/systemd-journald message+ 191 0.0 0.0 7008 3628 ? Ss 15:53 0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only root 203 0.4 0.1 2084564 48652 ? Ssl 15:53 0:00 /usr/bin/containerd root 204 0.0 0.0 12184 7252 ? Ss 15:53 0:00 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups root 3726 0.0 0.0 12296 7400 ? Ss 15:56 0:00 \_ sshd: docker [priv] docker 3728 0.0 0.0 12296 4712 ? S 15:56 0:00 \_ sshd: docker@pts/1 docker 3729 0.1 0.0 4248 3532 pts/1 Ss 15:56 0:00 \_ -bash docker 3739 0.0 0.0 6052 2920 pts/1 R+ 15:56 0:00 \_ ps auxf root 464 2.2 0.2 2123020 91892 ? Ssl 15:54 0:02 /usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --default-ulimit=nofile=1048576:1048576 --tlsverify --tlscacert /etc/docke (...)

In cas we have multiple minikube nodes we just need to specify the node using the -n option, otherwise we are going to get connected to the first one:

$ kubectl get nodes NAME STATUS ROLES AGE VERSION minikube Ready control-plane,master 6m34s v1.22.3 minikube-m02 Ready <none> 4m41s v1.22.3 $ minikube ssh docker@minikube:~$ logout $ minikube ssh -n minikube-m02 docker@minikube-m02:~$ logout

We can disable the native Golang SSH client to actually see the exact ssh command it uses to connect to the node:

$ minikube ssh -n minikube-m02 --native-ssh=false

On a minikube cluster created using docker container we would see something similar to:

(...)  8009 ? Ssl 0:07 \_ /usr/libexec/gnome-terminal-server  8017 pts/0 Ss 0:00 | \_ bash  40990 pts/0 Sl+ 0:00 | | \_ minikube ssh -n minikube-m02 --native-ssh=false  41118 pts/0 S+ 0:00 | | \_ /usr/bin/ssh -F /dev/null -o ConnectionAttempts=3 -o ConnectTimeout=10 -o ControlMaster=no -o ControlPath=none -o LogLevel=quiet -o PasswordAuthentication=no -o ServerAliveInterval=60 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null docker@127.0.0.1 -o IdentitiesOnly=yes -i /home/jprats/.minikube/machines/minikube-m02/id_rsa -p 32782 (...)

Posted on 09/05/2022

Categories