chore(ci): move set_dns.sh to ci dir (#7089)

Co-authored-by: soulbird <zhaothree@gmail.com>

Author: soulbird

ci/centos7-ci.sh

@@ -86,7 +86,7 @@ install_dependencies() {
 run_case() {
     export_or_prefix
     make init
-    ./utils/set-dns.sh
+    set_coredns
     # run test cases
     FLUSH_ETCD=1 prove -Itest-nginx/lib -I./ -r ${TEST_FILE_SUB_DIR} | tee /tmp/test.result
     rerun_flaky_tests /tmp/test.result

ci/common.sh

@@ -79,6 +79,48 @@ install_nodejs () {
     ln -s ${NODEJS_PREFIX}/bin/npm /usr/local/bin/npm
 }
 
+set_coredns() {
+    # test a domain name is configured as upstream
+    echo "127.0.0.1 test.com" | sudo tee -a /etc/hosts
+    echo "::1 ipv6.local" | sudo tee -a /etc/hosts
+    # test certificate verification
+    echo "127.0.0.1 admin.apisix.dev" | sudo tee -a /etc/hosts
+    cat /etc/hosts # check GitHub Action's configuration
+
+    # override DNS configures
+    if [ -f "/etc/netplan/50-cloud-init.yaml" ]; then
+        sudo pip3 install yq
+
+        tmp=$(mktemp)
+        yq -y '.network.ethernets.eth0."dhcp4-overrides"."use-dns"=false' /etc/netplan/50-cloud-init.yaml | \
+        yq -y '.network.ethernets.eth0."dhcp4-overrides"."use-domains"=false' | \
+        yq -y '.network.ethernets.eth0.nameservers.addresses[0]="8.8.8.8"' | \
+        yq -y '.network.ethernets.eth0.nameservers.search[0]="apache.org"' > $tmp
+        mv $tmp /etc/netplan/50-cloud-init.yaml
+        cat /etc/netplan/50-cloud-init.yaml
+        sudo netplan apply
+        sleep 3
+
+        sudo mv /etc/resolv.conf /etc/resolv.conf.bak
+        sudo ln -s /run/systemd/resolve/resolv.conf /etc/
+    fi
+    cat /etc/resolv.conf
+
+    mkdir -p build-cache
+
+    if [ ! -f "build-cache/coredns_1_8_1" ]; then
+        wget https://github.com/coredns/coredns/releases/download/v1.8.1/coredns_1.8.1_linux_amd64.tgz
+        tar -xvf coredns_1.8.1_linux_amd64.tgz
+        mv coredns build-cache/
+
+        touch build-cache/coredns_1_8_1
+    fi
+
+    pushd t/coredns || exit 1
+    ../../build-cache/coredns -dns.port=1053 &
+    popd || exit 1
+}
+
 GRPC_SERVER_EXAMPLE_VER=20210819
 
 linux_get_dependencies () {

ci/linux_apisix_current_luarocks_runner.sh

@@ -60,7 +60,7 @@ script() {
     cd ..
 
     # apisix cli test
-    ./utils/set-dns.sh
+    set_coredns
 
     # install test dependencies
     sudo pip install requests

ci/linux_openresty_common_runner.sh

@@ -68,7 +68,7 @@ script() {
     export_or_prefix
     openresty -V
 
-    ./utils/set-dns.sh
+    set_coredns
 
     ./t/grpc_server_example/grpc_server_example \
         -grpc-address :50051 -grpcs-address :50052 -grpcs-mtls-address :50053 \

t/cli/test_admin_mtls.sh

@@ -19,7 +19,7 @@
 
 . ./t/cli/common.sh
 
-# The 'admin.apisix.dev' is injected by utils/set-dns.sh
+# The 'admin.apisix.dev' is injected by ci/common.sh@set_coredns
 
 echo '
 apisix:

t/cli/test_etcd_mtls.sh

@@ -21,7 +21,7 @@
 
 exit_if_not_customed_nginx
 
-# The 'admin.apisix.dev' is injected by utils/set-dns.sh
+# The 'admin.apisix.dev' is injected by ci/common.sh@set_coredns
 
 # etcd mTLS verify
 echo '