github.com/lalkh/containerd@v1.4.3/script/setup/install-cni-windows (about)

     1  #!/bin/bash
     2  
     3  #   Copyright The containerd Authors.
     4  
     5  #   Licensed under the Apache License, Version 2.0 (the "License");
     6  #   you may not use this file except in compliance with the License.
     7  #   You may obtain a copy of the License at
     8  
     9  #       http://www.apache.org/licenses/LICENSE-2.0
    10  
    11  #   Unless required by applicable law or agreed to in writing, software
    12  #   distributed under the License is distributed on an "AS IS" BASIS,
    13  #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  #   See the License for the specific language governing permissions and
    15  #   limitations under the License.
    16  
    17  set -eu -o pipefail
    18  
    19  DESTDIR="${DESTDIR:-"C:\\Program Files\\containerd"}"
    20  WINCNI_BIN_DIR="${DESTDIR}/cni"
    21  WINCNI_PKG=github.com/Microsoft/windows-container-networking
    22  WINCNI_VERSION=aa10a0b31e9f72937063436454def1760b858ee2
    23  
    24  go get -d "${WINCNI_PKG}/..."
    25  cd "${GOPATH}/src/${WINCNI_PKG}"
    26  git checkout "${WINCNI_VERSION}"
    27  make all
    28  install -D -m 755 "out/nat.exe" "${WINCNI_BIN_DIR}/nat.exe"
    29  install -D -m 755 "out/sdnbridge.exe" "${WINCNI_BIN_DIR}/sdnbridge.exe"
    30  install -D -m 755 "out/sdnoverlay.exe" "${WINCNI_BIN_DIR}/sdnoverlay.exe"
    31  
    32  CNI_CONFIG_DIR="${DESTDIR}/cni/conf"
    33  mkdir -p "${CNI_CONFIG_DIR}"
    34  
    35  # split_ip splits ip into a 4-element array.
    36  split_ip() {
    37    local -r varname="$1"
    38    local -r ip="$2"
    39    for i in {0..3}; do
    40      eval "$varname"[$i]=$( echo "$ip" | cut -d '.' -f $((i + 1)) )
    41    done
    42  }
    43  
    44  # subnet gets subnet for a gateway, e.g. 192.168.100.0/24.
    45  calculate_subnet() {
    46    local -r gateway="$1"
    47    local -r prefix_len="$2"
    48    split_ip gateway_array "$gateway"
    49    local len=$prefix_len
    50    for i in {0..3}; do
    51      if (( len >= 8 )); then
    52        mask=255
    53      elif (( len > 0 )); then
    54        mask=$(( 256 - 2 ** ( 8 - len ) ))
    55      else
    56        mask=0
    57      fi
    58      (( len -= 8 ))
    59      result_array[i]=$(( gateway_array[i] & mask ))
    60    done
    61    result="$(printf ".%s" "${result_array[@]}")"
    62    result="${result:1}"
    63    echo "$result/$((32 - prefix_len))"
    64  }
    65  
    66  # nat already exists on the Windows VM, the subnet and gateway
    67  # we specify should match that.
    68  gateway="$(powershell -c "(Get-NetIPAddress -InterfaceAlias 'vEthernet (nat)' -AddressFamily IPv4).IPAddress")"
    69  prefix_len="$(powershell -c "(Get-NetIPAddress -InterfaceAlias 'vEthernet (nat)' -AddressFamily IPv4).PrefixLength")"
    70  
    71  subnet="$(calculate_subnet "$gateway" "$prefix_len")"
    72  
    73  # The "name" field in the config is used as the underlying
    74  # network type right now (see
    75  # https://github.com/microsoft/windows-container-networking/pull/45),
    76  # so it must match a network type in:
    77  # https://docs.microsoft.com/en-us/windows-server/networking/technologies/hcn/hcn-json-document-schemas
    78  bash -c 'cat >"'"${CNI_CONFIG_DIR}"'"/0-containerd-nat.conf <<EOF
    79  {
    80      "cniVersion": "0.2.0",
    81      "name": "nat",
    82      "type": "nat",
    83      "master": "Ethernet",
    84      "ipam": {
    85          "subnet": "'$subnet'",
    86          "routes": [
    87              {
    88                  "GW": "'$gateway'"
    89              }
    90          ]
    91      },
    92      "capabilities": {
    93          "portMappings": true,
    94          "dns": true
    95      }
    96  }
    97  EOF'