etcdctl.fn

A wrapper around the etcdctl provided in etcd container images.

Instead of building up horribly long kubectl exec commands to run etcdctl inside an etcd Pod, this shell function allows to simply run etcdctl commands as if you were there ;-)

e.g.
etcdctl member list -w table
instead of

        "ETCDCTL_API=3 ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key etcdctl member list -w table"```

etcdcl_all.fn

Here's a version for use with an HA cluster.

Note the -l option which loops every 2 seconds

# Function to simplify use of etcdctl from cp Node showing all endpoints status:
# - set POD to the Pod name for etcd on a Node:
# - set ENDPOINTS list
# - then try one of the commands:
#      etcdctl_all
#      etcdctl_all member list
#      etcdctl_all member list -w table
#      etcdctl_all member list -w table
#      etcdctl_all endpoint health
#      etcdctl_all -l endpoint status -w table
#
function etcdctl_all {
    local LOOP=0
    [ "$1" = "-x" ] && { shift; set -x; }
    [ "$1" = "-l" ] && { shift; LOOP=1; }
    [ -z "$1"      ]  &&  set -- endpoint status -w table

    POD=etcd-cp
    case $(hostname) in
                  cp) POD=etcd-cp;;
        secondcp|cp2) POD=etcd-secondcp;;
         thirdcp|cp3) POD=etcd-thirdcp;;
    esac

    ENDPOINTS="$( kubectl -n kube-system get pods -l component=etcd -o wide -o custom-columns=IP:.status.podIP --no-headers | sed -e 's/$/:2379/' -e 's/ /,/g' )"

    # NOTE: ETCDCTL_API=3 is no longer needed after Kubernetes 1.34

    echo "-- $(date) Running on $(hostname) [$(hostname -i)] -----------------------------"
    while true; do
        kubectl --request-timeout='1' -n kube-system exec -it $POD -- sh -c "ETCDCTL_API=3 ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key etcdctl --command-timeout=2s --endpoints $ENDPOINTS $*"
        [ $LOOP -eq 0 ] && { set +x; return; }
        sleep 2
    done
}