fix: allocate 2 consecutive free ports for ProxySQL (admin + mysql) to avoid TIME_WAIT conflicts

Author: renecannao

cmd/deploy_proxysql.go

@@ -41,6 +41,12 @@ func deploySandboxProxySQL(cmd *cobra.Command, args []string) {
 		common.Exitf(1, "proxysql binary not found in PATH: %s", err)
 	}
 
+	// Find 2 consecutive free ports (admin + mysql)
+	freePort, portErr := common.FindFreePort(port, []int{}, 2)
+	if portErr == nil {
+		port = freePort
+	}
+
 	sandboxHome := defaults.Defaults().SandboxHome
 	sandboxDir := path.Join(sandboxHome, fmt.Sprintf("proxysql_%d", port))
 

sandbox/proxysql_topology.go

@@ -32,11 +32,11 @@ func DeployProxySQLForTopology(sandboxDir string, masterPort int, slavePorts []i
 
 	if proxysqlPort == 0 {
 		proxysqlPort = 6032
-		// Try to find a free port
-		freePort, err := common.FindFreePort(proxysqlPort, []int{}, 1)
-		if err == nil {
-			proxysqlPort = freePort
-		}
+	}
+	// Find 2 consecutive free ports (admin + mysql) to avoid TIME_WAIT conflicts
+	freePort, err := common.FindFreePort(proxysqlPort, []int{}, 2)
+	if err == nil {
+		proxysqlPort = freePort
 	}
 
 	// Build backends: master = HG 0, slaves = HG 1