Lab 4.1 - sh: find: command not found

I ran into this as well. I am not entirely sure if it is because the etcd container is updated to a very minimal image, but I found a workaround:

1. On the control panel / master server, I looked for the etcd container:

sudo docker ps -a | grep etcd
efb1d0cf67a5        0369cf4303ff           "etcd --advertise-cl…"   About an hour ago   Up About an hour                                   k8s_etcd_etcd-cp01_kube-system_c14cf7d1dfa698068ffc2f808ebe757d_5
eb00f4b04d24        k8s.gcr.io/pause:3.2   "/pause"                 About an hour ago   Up About an hour                                   k8s_POD_etcd-cp01_kube-system_c14cf7d1dfa698068ffc2f808ebe757d_5
f0cc0d56dfbf        0369cf4303ff           "etcd --advertise-cl…"   32 hours ago        Exited (0) 32 hours ago                            k8s_etcd_etcd-cp01_kube-system_c14cf7d1dfa698068ffc2f808ebe757d_4
4ed688ab3e53        k8s.gcr.io/pause:3.2   "/pause"                 32 hours ago        Exited (0) 32 hours ago                            k8s_POD_etcd-cp01_kube-system_c14cf7d1dfa698068ffc2f808ebe757d_4

2. Once I found the container, I ran docker inspec on the container and look at the parameters passed to the containers that reference the etc directory, like so:

rilindo@cp01:~$ sudo docker inspect efb1d0cf67a5 | grep etc
        "Path": "etcd",
            "--cert-file=/etc/kubernetes/pki/etcd/server.crt",
            "--data-dir=/var/lib/etcd",
            "--key-file=/etc/kubernetes/pki/etcd/server.key",
            "--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt",
            "--peer-key-file=/etc/kubernetes/pki/etcd/peer.key",
            "--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt",
            "--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt"
        "HostsPath": "/var/lib/kubelet/pods/c14cf7d1dfa698068ffc2f808ebe757d/etc-hosts",
        "Name": "/k8s_etcd_etcd-cp01_kube-system_c14cf7d1dfa698068ffc2f808ebe757d_5",
                "/var/lib/etcd:/var/lib/etcd",
                "/etc/kubernetes/pki/etcd:/etc/kubernetes/pki/etcd",
                "/var/lib/kubelet/pods/c14cf7d1dfa698068ffc2f808ebe757d/etc-hosts:/etc/hosts",
                "/var/lib/kubelet/pods/c14cf7d1dfa698068ffc2f808ebe757d/containers/etcd/7aecfad3:/dev/termination-log"
                "Source": "/var/lib/etcd",
                "Destination": "/var/lib/etcd",
                "Source": "/etc/kubernetes/pki/etcd",
                "Destination": "/etc/kubernetes/pki/etcd",
                "Source": "/var/lib/kubelet/pods/c14cf7d1dfa698068ffc2f808ebe757d/etc-hosts",
                "Destination": "/etc/hosts",
                "Source": "/var/lib/kubelet/pods/c14cf7d1dfa698068ffc2f808ebe757d/containers/etcd/7aecfad3",
                "SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt"
                "etcd",
                "--cert-file=/etc/kubernetes/pki/etcd/server.crt",
                "--data-dir=/var/lib/etcd",
                "--key-file=/etc/kubernetes/pki/etcd/server.key",
                "--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt",
                "--peer-key-file=/etc/kubernetes/pki/etcd/peer.key",
                "--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt",
                "--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt"
                "io.kubernetes.container.logpath": "/var/log/pods/kube-system_etcd-cp01_c14cf7d1dfa698068ffc2f808ebe757d/etcd/5.log",
                "io.kubernetes.container.name": "etcd",
                "io.kubernetes.pod.name": "etcd-cp01",

3. Now I got the paths, I can simply log in to the etcd pod and using the paths I found in my grep output, backup the etcd database.

@chrispokorni That is even easier. I would go with that approach, then.

Hi @johnley,

Due to continuous changes in Kubernetes and its components, luckily, the latest image versions of the etcd container image supports again most commands that allow us to manage artifacts inside the running container. That means that now we can run again commands such as cd, ls, cp, mv, rm, rmdir, touch, grep, cat, echo, which, ip in an interactive terminal on the etcd container.

Regards,
-Chris