deploy: add native mysql clone helper for 110

ops/110-native-mysql/README.md

@@ -56,3 +56,14 @@ FROM performance_schema.replication_applier_status;
 Both replication service states must be `ON`, both read-only values must be
 `1`, and the connection error number must be `0` before ProxySQL can use the
 host.
+
+Clone the second and backup replicas from the first MySQL 8.0.46 replica with
+a temporary, root-readable secret file that is never committed:
+
+```bash
+sudo ./clone-replica.sh 192.168.110.73 /path/to/clone-secret
+```
+
+The donor account must be limited to `BACKUP_ADMIN`. Remove that account and
+all temporary secret files after both clones have completed and replication
+has been verified.

ops/110-native-mysql/clone-replica.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $EUID -ne 0 || $# -ne 2 ]]; then
+  echo "usage: sudo $0 <donor-ip> <clone-secret-file>" >&2
+  exit 2
+fi
+
+donor_host=$1
+secret_file=$(realpath "$2")
+
+if [[ ! $donor_host =~ ^192\.168\.110\.[0-9]{1,3}$ ]]; then
+  echo "invalid donor IP: $donor_host" >&2
+  exit 2
+fi
+
+if [[ ! -f $secret_file || ! -s $secret_file ]]; then
+  echo "clone secret file is missing or empty: $secret_file" >&2
+  exit 2
+fi
+
+clone_secret=$(tr -d '\r\n' < "$secret_file")
+if [[ ! $clone_secret =~ ^[0-9a-fA-F]{32}$ ]]; then
+  echo "clone secret must contain exactly 32 hexadecimal characters" >&2
+  unset clone_secret
+  exit 2
+fi
+
+restore_read_only() {
+  mysql --protocol=socket -uroot --force \
+    -e "SET GLOBAL read_only=ON; SET GLOBAL super_read_only=ON" \
+    >/dev/null 2>&1 || true
+}
+
+if ! mysql --protocol=socket -uroot -Nse \
+  "SELECT PLUGIN_STATUS FROM information_schema.PLUGINS WHERE PLUGIN_NAME='clone'" \
+  | grep -qx ACTIVE; then
+  trap restore_read_only EXIT
+  mysql --protocol=socket -uroot <<'SQL'
+SET SESSION sql_log_bin=0;
+SET GLOBAL super_read_only=OFF;
+SET GLOBAL read_only=OFF;
+INSTALL PLUGIN clone SONAME 'mysql_clone.so';
+SET GLOBAL read_only=ON;
+SET GLOBAL super_read_only=ON;
+SQL
+  trap - EXIT
+fi
+
+mysql --protocol=socket -uroot -e \
+  "SET GLOBAL clone_valid_donor_list='${donor_host}:3306'; CLONE INSTANCE FROM 'clone_110'@'${donor_host}':3306 IDENTIFIED BY '${clone_secret}'"
+unset clone_secret
+
+mysql --protocol=socket -uroot -e \
+  "SELECT STATE,SOURCE,ERROR_NO,ERROR_MESSAGE FROM performance_schema.clone_status; SELECT @@server_id,@@read_only,@@super_read_only,@@gtid_mode"