Fixed reboot not working

alpine/rootfs-extra/opt/scripts/apply-node-config.sh

@@ -31,6 +31,8 @@ load_config() {
     MGMT_IFACE="${MGMT_IFACE:-}"
     MGMT_ADDRESS="${MGMT_ADDRESS:-}"
     MGMT_GATEWAY="${MGMT_GATEWAY:-}"
+    DNS_NAMESERVERS="${DNS_NAMESERVERS:-}"
+    DNS_SEARCH_DOMAINS="${DNS_SEARCH_DOMAINS:-}"
 }
 
 validate_config() {
@@ -45,17 +47,23 @@ validate_config() {
             fail "MGMT_ADDRESS must include a CIDR prefix, example: 10.0.0.13/24"
             ;;
     esac
+
+    if [ -n "$DNS_NAMESERVERS" ]; then
+        for ns in $DNS_NAMESERVERS; do
+            case "$ns" in
+                10.96.0.10)
+                    fail "DNS_NAMESERVERS must not contain cluster DNS service IP (10.96.0.10)"
+                    ;;
+            esac
+        done
+    fi
 }
 
 check_prereqs() {
+	# only the special one, coreutils should not be checked
     need_cmd ip
     need_cmd hostname
     need_cmd grep
-    need_cmd awk
-    need_cmd cut
-    need_cmd mkdir
-    need_cmd printf
-    need_cmd cat
 }
 
 configure_mgmt_interface() {
@@ -123,16 +131,59 @@ net.ipv4.ip_forward = 1
 EOF
 }
 
+configure_dns() {
+    local tmpfile
+    local ns_count=0
+
+    if [ -z "$DNS_NAMESERVERS" ]; then
+        log "DNS_NAMESERVERS not set; leaving /etc/resolv.conf unchanged"
+        return
+    fi
+
+    mkdir -p /etc
+    tmpfile="/etc/resolv.conf.monok8s.tmp"
+    : > "$tmpfile"
+
+    if [ -n "$DNS_SEARCH_DOMAINS" ]; then
+        printf 'search %s\n' "$DNS_SEARCH_DOMAINS" >> "$tmpfile"
+    fi
+
+    for ns in $DNS_NAMESERVERS; do
+        printf 'nameserver %s\n' "$ns" >> "$tmpfile"
+        ns_count=$((ns_count + 1))
+    done
+
+    [ "$ns_count" -gt 0 ] || fail "DNS_NAMESERVERS is set but no valid nameservers were parsed"
+
+    printf 'options timeout:2 attempts:3\n' >> "$tmpfile"
+
+    mv "$tmpfile" /etc/resolv.conf
+    log "configured /etc/resolv.conf from DNS_NAMESERVERS"
+}
+
 print_summary() {
     log "node configuration applied"
     log "hostname: $HOSTNAME"
     log "interface: $MGMT_IFACE"
     log "address: $MGMT_ADDRESS"
+
     if [ -n "${MGMT_GATEWAY:-}" ]; then
         log "gateway: $MGMT_GATEWAY"
     else
         log "gateway: <not set>"
     fi
+
+    if [ -n "${DNS_NAMESERVERS:-}" ]; then
+        log "dns nameservers: $DNS_NAMESERVERS"
+    else
+        log "dns nameservers: <unchanged>"
+    fi
+
+    if [ -n "${DNS_SEARCH_DOMAINS:-}" ]; then
+        log "dns search: $DNS_SEARCH_DOMAINS"
+    else
+        log "dns search: <not set>"
+    fi
 }
 
 main() {
@@ -142,8 +193,9 @@ main() {
 
     ensure_ip_forward
     configure_mgmt_interface
+    configure_dns
     set_hostname_if_needed
     print_summary
 }
 
-main "$@"
+main "$@"