添加 'Yaml文件/deploy.sh'

2023-06-27 01:21:14 +08:00 · 2023-06-27 01:21:14 +08:00 · 5a13d225ed
parent 3f429cee63
commit 5a13d225ed
1 changed files with 123 additions and 0 deletions
--- a/Yaml文件/deploy.sh
+++ b/Yaml文件/deploy.sh
@ -0,0 +1,123 @@
+#!/bin/bash
+
+# Deploys CoreDNS to a cluster currently running Kube-DNS.
+
+show_help () {
+cat << USAGE
+usage: $0 [ -r REVERSE-CIDR ] [ -i DNS-IP ] [ -d CLUSTER-DOMAIN ] [ -t YAML-TEMPLATE ]
+
+    -r : Define a reverse zone for the given CIDR. You may specify this option more
+         than once to add multiple reverse zones. If no reverse CIDRs are defined,
+         then the default is to handle all reverse zones (i.e. in-addr.arpa and ip6.arpa)
+    -i : Specify the cluster DNS IP address. If not specified, the IP address of
+         the existing "kube-dns" service is used, if present.
+    -s : Skips the translation of kube-dns configmap to the corresponding CoreDNS Corefile configuration.
+
+USAGE
+exit 0
+}
+
+# Simple Defaults
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+CLUSTER_DOMAIN=cluster.local
+YAML_TEMPLATE="$DIR/coredns.yaml.sed"
+STUBDOMAINS=""
+UPSTREAM=\\/etc\\/resolv\.conf
+
+# Translates the kube-dns ConfigMap to equivalent CoreDNS Configuration.
+function translate-kube-dns-configmap {
+    kube-dns-upstreamnameserver-to-coredns
+    kube-dns-stubdomains-to-coredns
+}
+
+function kube-dns-upstreamnameserver-to-coredns {
+  up=$(kubectl -n kube-system get configmap kube-dns  -ojsonpath='{.data.upstreamNameservers}' 2> /dev/null | tr -d '[",]')
+  if [[ ! -z ${up} ]]; then
+    UPSTREAM=${up}
+  fi
+}
+
+function kube-dns-stubdomains-to-coredns {
+  STUBDOMAIN_TEMPLATE='
+    SD_DOMAIN:53 {
+      errors
+      cache 30
+      loop
+      forward . SD_DESTINATION {
+        max_concurrent 1000
+      }
+    }'
+
+  function dequote {
+    str=${1#\"} # delete leading quote
+    str=${str%\"} # delete trailing quote
+    echo ${str}
+  }
+
+  function parse_stub_domains() {
+    sd=$1
+
+  # get keys - each key is a domain
+  sd_keys=$(echo -n $sd | jq keys[])
+
+  # For each domain ...
+  for dom in $sd_keys; do
+    dst=$(echo -n $sd | jq '.['$dom'][0]') # get the destination
+
+    dom=$(dequote $dom)
+    dst=$(dequote $dst)
+
+    sd_stanza=${STUBDOMAIN_TEMPLATE/SD_DOMAIN/$dom} # replace SD_DOMAIN
+    sd_stanza=${sd_stanza/SD_DESTINATION/$dst} # replace SD_DESTINATION
+    echo "$sd_stanza"
+  done
+}
+
+  sd=$(kubectl -n kube-system get configmap kube-dns  -ojsonpath='{.data.stubDomains}' 2> /dev/null)
+  STUBDOMAINS=$(parse_stub_domains "$sd")
+}
+
+
+# Get Opts
+while getopts "hsr:i:d:t:k:" opt; do
+    case "$opt" in
+    h)  show_help
+        ;;
+    s)  SKIP=1
+        ;;
+    r)  REVERSE_CIDRS="$REVERSE_CIDRS $OPTARG"
+        ;;
+    i)  CLUSTER_DNS_IP=$OPTARG
+        ;;
+    d)  CLUSTER_DOMAIN=$OPTARG
+        ;;
+    t)  YAML_TEMPLATE=$OPTARG
+        ;;
+    esac
+done
+
+# Conditional Defaults
+if [[ -z $REVERSE_CIDRS ]]; then
+  REVERSE_CIDRS="in-addr.arpa ip6.arpa"
+fi
+if [[ -z $CLUSTER_DNS_IP ]]; then
+  # Default IP to kube-dns IP
+  CLUSTER_DNS_IP=$(kubectl get service --namespace kube-system kube-dns -o jsonpath="{.spec.clusterIP}")
+  if [ $? -ne 0 ]; then
+      >&2 echo "Error! The IP address for DNS service couldn't be determined automatically. Please specify the DNS-IP with the '-i' option."
+      exit 2
+  fi
+fi
+
+if [[ "${SKIP}" -ne 1 ]] ; then
+    translate-kube-dns-configmap
+fi
+
+orig=$'\n'
+replace=$'\\\n'
+sed -e "s/CLUSTER_DNS_IP/$CLUSTER_DNS_IP/g" \
+    -e "s/CLUSTER_DOMAIN/$CLUSTER_DOMAIN/g" \
+    -e "s?REVERSE_CIDRS?$REVERSE_CIDRS?g" \
+    -e "s@STUBDOMAINS@${STUBDOMAINS//$orig/$replace}@g" \
+    -e "s/UPSTREAMNAMESERVER/$UPSTREAM/g" \
+    "${YAML_TEMPLATE}"