dns: add chat-dns.sh for managing chat.eterfund.ru A records

dns/chat-dns.sh

+#!/bin/bash
+# chat-dns.sh — manage A records for chat.eterfund.ru
+# Run on ns1. Usage: chat-dns.sh on|off|status
+#
+# on     — add all three A records (round-robin)
+# off    — keep only the primary IP
+# status — show current A records
+
+DOMAIN="chat.eterfund.ru"
+ZONE="eterfund.ru"
+TTL=300
+NS="ns1.etersoft.ru"
+
+PRIMARY="91.232.225.3"
+EXTRA_IPS="95.47.184.52 217.12.37.55"
+
+usage() {
+    echo "Usage: $0 on|off|status"
+    echo "  on     — set all three A records (round-robin)"
+    echo "  off    — keep only primary ($PRIMARY)"
+    echo "  status — show current A records"
+    exit 1
+}
+
+dns_status() {
+    echo "Current A records for $DOMAIN:"
+    dig +short "$DOMAIN" A @"$NS"
+}
+
+dns_on() {
+    echo "Adding all A records for $DOMAIN..."
+    nsupdate -l <<EOF
+zone $ZONE
+update delete $DOMAIN. A
+update add $DOMAIN. $TTL A $PRIMARY
+update add $DOMAIN. $TTL A 95.47.184.52
+update add $DOMAIN. $TTL A 217.12.37.55
+send
+EOF
+    if [ $? -eq 0 ]; then
+        echo "Done. All three IPs active."
+    else
+        echo "nsupdate failed. Check allow-update in zone config." >&2
+        exit 1
+    fi
+    dns_status
+}
+
+dns_off() {
+    echo "Removing extra A records, keeping only $PRIMARY..."
+    nsupdate -l <<EOF
+zone $ZONE
+update delete $DOMAIN. A
+update add $DOMAIN. $TTL A $PRIMARY
+send
+EOF
+    if [ $? -eq 0 ]; then
+        echo "Done. Only primary IP active."
+    else
+        echo "nsupdate failed." >&2
+        exit 1
+    fi
+    dns_status
+}
+
+case "${1:-}" in
+    on)     dns_on ;;
+    off)    dns_off ;;
+    status) dns_status ;;
+    *)      usage ;;
+esac