#!/usr/bin/env bash
curl -L \
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv3.6.1/kustomize_v3.6.1_linux_amd64.tar.gz -o /tmp/kustomize.tar.gz
tar -xzf /tmp/kustomize.tar.gz -C  /usr/local/bin
echo "kustomize install successfully"

#!/usr/bin/env bash
#curl은 사용자 상호 작용 없이 작동하도록 설계된 서버로 데이터를 전송하기 위한 명령줄 유틸리티이다.
#curl을 사용하면 HTTP, HTTPS, SCP, SFTP 및 FTP 등 지원되는 프로토콜 중 하나를 사용하여 데이터를 다운로드하거나 업로드할 수 있다.
#curl의 -L 옵션은 서버에서 HTTP 301이나 HTTP 302 응답이 왔을 경우 redirection URL로 따라간다는 것이다.
#301은 301, Permanently Moved
#Permanently라는 뜻이 영구히, 영구적인 이라는 뜻이므로, 영구적으로 이동한다는 것이다. 요청된 리소스가 영구적으로 이동 페이지로 이동되었다는 것이다.
#302, Temporarily Moved
#Temporarily라는 뜻이 임시적, 임시적인 이라는 뜻이므로, 임시적으로 이동했다는 것을 나타냅니다. 요청된 리소스가 임시적으로 이동 페이지로 이동되었다는 것이다.
# '\' 표시는 줄바꿈하는 것이다.
curl -L \

#-o 옵션은 해당 링크에서 다운로드 받은 결과를 지정한 /tmp 아래 kustomize.tar.gz라는 이름의 파일로 저장한다.
#윈도우에서 기본적이고 많이 사용하는 압축 형식이 zip이라면
#리눅스에서는 tar.gz를 많이 사용한다. 리눅스에서 tar.gz는 별도의
#설치 없이 기본적으로 지원하는 압축 형식이다.
https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv3.6.1/kustomize_v3.6.1_linux_amd64.tar.gz -o /tmp/kustomize.tar.gz

#tar -xzf는 압축을 해제하는 명령이다.
#tar 옵션 -x: 묶음을 해제
#-z: gunzip을 사용
#-f: 파일 이름을 지정
#즉 /tmp 아래 kustomize.tar.gz 파일의 압축을 해제한다.
#-C 옵션은 압축을 해제한 다음에 /usr/local/bin 디렉터리에 넣으라는 것이다.
#이를 통해 배시 쉘에서 바로 실행할 수 있게 만든다.
tar -xzf /tmp/kustomize.tar.gz -C  /usr/local/bin
echo "kustomize install successfully"

kustomize create --namespace=metallb-system --resources namespace.yaml, metallb.yaml, metallb-l2config.yaml

kustomize edit set image metallb/controller:v0.8.2
kustomize edit set image metallb/speaker:v0.8.2

kustomize build | kubectl apply -f -

kubectl get pods -n metallb-system

kubectl get configmap -n metallb-system

kubectl describe pods -n metallb-system | grep Image:

export DESIRED_VERSION=v3.2.1; ~/Book_k8sInfra/ch5/5.2.3/helm-install.sh

#!/usr/bin/env bash

# Copyright The Helm Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The install script is based off of the MIT-licensed script from glide,
# the package manager for Go: https://github.com/Masterminds/glide.sh/blob/master/get

: ${BINARY_NAME:="helm"}
: ${USE_SUDO:="true"}
: ${DEBUG:="false"}
: ${VERIFY_CHECKSUM:="true"}
: ${VERIFY_SIGNATURES:="false"}
: ${HELM_INSTALL_DIR:="/usr/local/bin"}

HAS_CURL="$(type "curl" &> /dev/null && echo true || echo false)"
HAS_WGET="$(type "wget" &> /dev/null && echo true || echo false)"
HAS_OPENSSL="$(type "openssl" &> /dev/null && echo true || echo false)"
HAS_GPG="$(type "gpg" &> /dev/null && echo true || echo false)"

# initArch discovers the architecture for this system.
initArch() {
  ARCH=$(uname -m)
  case $ARCH in
    armv5*) ARCH="armv5";;
    armv6*) ARCH="armv6";;
    armv7*) ARCH="arm";;
    aarch64) ARCH="arm64";;
    x86) ARCH="386";;
    x86_64) ARCH="amd64";;
    i686) ARCH="386";;
    i386) ARCH="386";;
  esac
}

# initOS discovers the operating system for this system.
initOS() {
  OS=$(echo `uname`|tr '[:upper:]' '[:lower:]')

  case "$OS" in
    # Minimalist GNU for Windows
    mingw*) OS='windows';;
  esac
}

# runs the given command as root (detects if we are root already)
runAsRoot() {
  local CMD="$*"

  if [ $EUID -ne 0 -a $USE_SUDO = "true" ]; then
    CMD="sudo $CMD"
  fi

  $CMD
}

# verifySupported checks that the os/arch combination is supported for
# binary builds, as well whether or not necessary tools are present.
verifySupported() {
  local supported="darwin-amd64\nlinux-386\nlinux-amd64\nlinux-arm\nlinux-arm64\nlinux-ppc64le\nlinux-s390x\nwindows-amd64"
  if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
    echo "No prebuilt binary for ${OS}-${ARCH}."
    echo "To build from source, go to https://github.com/helm/helm"
    exit 1
  fi

  if [ "${HAS_CURL}" != "true" ] && [ "${HAS_WGET}" != "true" ]; then
    echo "Either curl or wget is required"
    exit 1
  fi

  if [ "${VERIFY_CHECKSUM}" == "true" ] && [ "${HAS_OPENSSL}" != "true" ]; then
    echo "In order to verify checksum, openssl must first be installed."
    echo "Please install openssl or set VERIFY_CHECKSUM=false in your environment."
    exit 1
  fi

  if [ "${VERIFY_SIGNATURES}" == "true" ]; then
    if [ "${HAS_GPG}" != "true" ]; then
      echo "In order to verify signatures, gpg must first be installed."
      echo "Please install gpg or set VERIFY_SIGNATURES=false in your environment."
      exit 1
    fi
    if [ "${OS}" != "linux" ]; then
      echo "Signature verification is currently only supported on Linux."
      echo "Please set VERIFY_SIGNATURES=false or verify the signatures manually."
      exit 1
    fi
  fi
}

# checkDesiredVersion checks if the desired version is available.
checkDesiredVersion() {
  if [ "x$DESIRED_VERSION" == "x" ]; then
    # Get tag from release URL
    local latest_release_url="https://github.com/helm/helm/releases"
    if [ "${HAS_CURL}" == "true" ]; then
      TAG=$(curl -Ls $latest_release_url | grep 'href="/helm/helm/releases/tag/v3.[0-9]*.[0-9]*\"' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
    elif [ "${HAS_WGET}" == "true" ]; then
      TAG=$(wget $latest_release_url -O - 2>&1 | grep 'href="/helm/helm/releases/tag/v3.[0-9]*.[0-9]*\"' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
    fi
  else
    TAG=$DESIRED_VERSION
  fi
}

# checkHelmInstalledVersion checks which version of helm is installed and
# if it needs to be changed.
checkHelmInstalledVersion() {
  if [[ -f "${HELM_INSTALL_DIR}/${BINARY_NAME}" ]]; then
    local version=$("${HELM_INSTALL_DIR}/${BINARY_NAME}" version --template="")
    if [[ "$version" == "$TAG" ]]; then
      echo "Helm ${version} is already ${DESIRED_VERSION:-latest}"
      return 0
    else
      echo "Helm ${TAG} is available. Changing from version ${version}."
      return 1
    fi
  else
    return 1
  fi
}

# downloadFile downloads the latest binary package and also the checksum
# for that binary.
downloadFile() {
  HELM_DIST="helm-$TAG-$OS-$ARCH.tar.gz"
  DOWNLOAD_URL="https://get.helm.sh/$HELM_DIST"
  CHECKSUM_URL="$DOWNLOAD_URL.sha256"
  HELM_TMP_ROOT="$(mktemp -dt helm-installer-XXXXXX)"
  HELM_TMP_FILE="$HELM_TMP_ROOT/$HELM_DIST"
  HELM_SUM_FILE="$HELM_TMP_ROOT/$HELM_DIST.sha256"
  echo "Downloading $DOWNLOAD_URL"
  if [ "${HAS_CURL}" == "true" ]; then
    curl -SsL "$CHECKSUM_URL" -o "$HELM_SUM_FILE"
    curl -SsL "$DOWNLOAD_URL" -o "$HELM_TMP_FILE"
  elif [ "${HAS_WGET}" == "true" ]; then
    wget -q -O "$HELM_SUM_FILE" "$CHECKSUM_URL"
    wget -q -O "$HELM_TMP_FILE" "$DOWNLOAD_URL"
  fi
}

# verifyFile verifies the SHA256 checksum of the binary package
# and the GPG signatures for both the package and checksum file
# (depending on settings in environment).
verifyFile() {
  if [ "${VERIFY_CHECKSUM}" == "true" ]; then
    verifyChecksum
  fi
  if [ "${VERIFY_SIGNATURES}" == "true" ]; then
    verifySignatures
  fi
}

# installFile installs the Helm binary.
installFile() {
  HELM_TMP="$HELM_TMP_ROOT/$BINARY_NAME"
  mkdir -p "$HELM_TMP"
  tar xf "$HELM_TMP_FILE" -C "$HELM_TMP"
  HELM_TMP_BIN="$HELM_TMP/$OS-$ARCH/helm"
  echo "Preparing to install $BINARY_NAME into ${HELM_INSTALL_DIR}"
  runAsRoot cp "$HELM_TMP_BIN" "$HELM_INSTALL_DIR/$BINARY_NAME"
  echo "$BINARY_NAME installed into $HELM_INSTALL_DIR/$BINARY_NAME"
}

# verifyChecksum verifies the SHA256 checksum of the binary package.
verifyChecksum() {
  printf "Verifying checksum... "
  local sum=$(openssl sha1 -sha256 ${HELM_TMP_FILE} | awk '{print $2}')
  local expected_sum=$(cat ${HELM_SUM_FILE})
  if [ "$sum" != "$expected_sum" ]; then
    echo "SHA sum of ${HELM_TMP_FILE} does not match. Aborting."
    exit 1
  fi
  echo "Done."
}

# verifySignatures obtains the latest KEYS file from GitHub master branch
# as well as the signature .asc files from the specific GitHub release,
# then verifies that the release artifacts were signed by a maintainer's key.
verifySignatures() {
  printf "Verifying signatures... "
  local keys_filename="KEYS"
  local github_keys_url="https://raw.githubusercontent.com/helm/helm/master/${keys_filename}"
  if [ "${HAS_CURL}" == "true" ]; then
    curl -SsL "${github_keys_url}" -o "${HELM_TMP_ROOT}/${keys_filename}"
  elif [ "${HAS_WGET}" == "true" ]; then
    wget -q -O "${HELM_TMP_ROOT}/${keys_filename}" "${github_keys_url}"
  fi
  local gpg_keyring="${HELM_TMP_ROOT}/keyring.gpg"
  local gpg_homedir="${HELM_TMP_ROOT}/gnupg"
  mkdir -p -m 0700 "${gpg_homedir}"
  local gpg_stderr_device="/dev/null"
  if [ "${DEBUG}" == "true" ]; then
    gpg_stderr_device="/dev/stderr"
  fi
  gpg --batch --quiet --homedir="${gpg_homedir}" --import "${HELM_TMP_ROOT}/${keys_filename}" 2> "${gpg_stderr_device}"
  gpg --batch --no-default-keyring --keyring "${gpg_homedir}/pubring.kbx" --export > "${gpg_keyring}"
  local github_release_url="https://github.com/helm/helm/releases/download/${TAG}"
  if [ "${HAS_CURL}" == "true" ]; then
    curl -SsL "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" -o "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc"
    curl -SsL "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" -o "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc"
  elif [ "${HAS_WGET}" == "true" ]; then
    wget -q -O "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc"
    wget -q -O "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc"
  fi
  local error_text="If you think this might be a potential security issue,"
  error_text="${error_text}\nplease see here: https://github.com/helm/community/blob/master/SECURITY.md"
  local num_goodlines_sha=$(gpg --verify --keyring="${gpg_keyring}" --status-fd=1 "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" 2> "${gpg_stderr_device}" | grep -c -E '^\[GNUPG:\] (GOODSIG|VALIDSIG)')
  if [[ ${num_goodlines_sha} -lt 2 ]]; then
    echo "Unable to verify the signature of helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256!"
    echo -e "${error_text}"
    exit 1
  fi
  local num_goodlines_tar=$(gpg --verify --keyring="${gpg_keyring}" --status-fd=1 "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" 2> "${gpg_stderr_device}" | grep -c -E '^\[GNUPG:\] (GOODSIG|VALIDSIG)')
  if [[ ${num_goodlines_tar} -lt 2 ]]; then
    echo "Unable to verify the signature of helm-${TAG}-${OS}-${ARCH}.tar.gz!"
    echo -e "${error_text}"
    exit 1
  fi
  echo "Done."
}

# fail_trap is executed if an error occurs.
fail_trap() {
  result=$?
  if [ "$result" != "0" ]; then
    if [[ -n "$INPUT_ARGUMENTS" ]]; then
      echo "Failed to install $BINARY_NAME with the arguments provided: $INPUT_ARGUMENTS"
      help
    else
      echo "Failed to install $BINARY_NAME"
    fi
    echo -e "\tFor support, go to https://github.com/helm/helm."
  fi
  cleanup
  exit $result
}

# testVersion tests the installed client to make sure it is working.
testVersion() {
  set +e
  HELM="$(command -v $BINARY_NAME)"
  if [ "$?" = "1" ]; then
    echo "$BINARY_NAME not found. Is $HELM_INSTALL_DIR on your "'$PATH?'
    exit 1
  fi
  set -e
}

# help provides possible cli installation arguments
help () {
  echo "Accepted cli arguments are:"
  echo -e "\t[--help|-h ] ->> prints this help"
  echo -e "\t[--version|-v <desired_version>] . When not defined it fetches the latest release from GitHub"
  echo -e "\te.g. --version v3.0.0 or -v canary"
  echo -e "\t[--no-sudo]  ->> install without sudo"
}

# cleanup temporary files to avoid https://github.com/helm/helm/issues/2977
cleanup() {
  if [[ -d "${HELM_TMP_ROOT:-}" ]]; then
    rm -rf "$HELM_TMP_ROOT"
  fi
}

# Execution

#Stop execution on any error
trap "fail_trap" EXIT
set -e

# Set debug if desired
if [ "${DEBUG}" == "true" ]; then
  set -x
fi

# Parsing input arguments (if any)
export INPUT_ARGUMENTS="${@}"
set -u
while [[ $# -gt 0 ]]; do
  case $1 in
    '--version'|-v)
       shift
       if [[ $# -ne 0 ]]; then
           export DESIRED_VERSION="${1}"
       else
           echo -e "Please provide the desired version. e.g. --version v3.0.0 or -v canary"
           exit 0
       fi
       ;;
    '--no-sudo')
       USE_SUDO="false"
       ;;
    '--help'|-h)
       help
       exit 0
       ;;
    *) exit 1
       ;;
  esac
  shift
done
set +u

initArch
initOS
verifySupported
checkDesiredVersion
if ! checkHelmInstalledVersion; then
  downloadFile
  verifyFile
  installFile
fi
testVersion
cleanup

helm repo add edu https://iac-source.github.io/helm-charts

helm repo update

helm install metallb edu/metallb \
--namespace=metallb-system \
--create-namespace \
--set controller.tag=v0.8.3 \
--set speaker.tag=v0.8.3 \
--set configmap.ipRange=192.168.1.11-192.168.1.29

kubectl get pods -n metallb-system

kubectl describe pods -n metallb-system | grep Image: