Gracefully recreate nginx pod in kubernetes daemonset

recreate-nginx.sh

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

function test-stable {
    for PHASE in $(kubectl -n kube-system get pods -l app=nginx -o json | jq -r '.items[].status.phase'); do
        if [[ "$PHASE" != "Running" ]]; then
            echo "pod is $PHASE, waiting"
            return 1
        fi
    done
    return 0
}

function await-stable {
    while ! test-stable; do
        sleep 3
    done
    echo "all nginx pods are running"
}

for POD_ID in $(kubectl -n kube-system get pods -l app=nginx -o json | jq -r '.items[].metadata.name'); do
    echo "$POD_ID"
    kubectl -n kube-system delete pod "$POD_ID"
    await-stable
done