diff --git a/clickhouse-client/src/test/java/com/clickhouse/client/ClusterClickHouseContainerStarter.java b/clickhouse-client/src/test/java/com/clickhouse/client/ClusterClickHouseContainerStarter.java
index 9cd96dd7f..7d255fc18 100644
--- a/clickhouse-client/src/test/java/com/clickhouse/client/ClusterClickHouseContainerStarter.java
+++ b/clickhouse-client/src/test/java/com/clickhouse/client/ClusterClickHouseContainerStarter.java
@@ -21,6 +21,11 @@ final class ClusterClickHouseContainerStarter extends ClickHouseContainerStarter
     private static final String NGINX_CONFIG = "containers/nginx/nginx.conf";
     private static final String KEEPER_CONFIG = "containers/clickhouse-keeper/keeper_config.xml";
     private static final int KEEPER_PORT = 9181;
+    /**
+     * Memory limit of each replica container. A server sizes its memory limit and caches from the
+     * container limit, instead of sizing them for the whole runner.
+     */
+    private static final long NODE_MEMORY_BYTES = 2L * 1024 * 1024 * 1024;
 
     private final GenericContainer<?> keeper;
     private final List<GenericContainer<?>> nodes;
@@ -50,7 +55,8 @@ final class ClusterClickHouseContainerStarter extends ClickHouseContainerStarter
         List<GenericContainer<?>> created = new ArrayList<GenericContainer<?>>(NODE_COUNT);
         for (int index = 1; index <= NODE_COUNT; index++) {
             String name = baseName == null ? null : baseName + "-" + index;
-            created.add(newClickHouseServer("clickhouse-" + index, name, "r" + index));
+            created.add(newClickHouseServer("clickhouse-" + index, name, "r" + index)
+                    .withCreateContainerCmdModifier(command -> command.getHostConfig().withMemory(NODE_MEMORY_BYTES)));
         }
         this.nodes = created;
 
diff --git a/clickhouse-client/src/test/resources/containers/clickhouse-cluster/config.d/custom_config.xml b/clickhouse-client/src/test/resources/containers/clickhouse-cluster/config.d/custom_config.xml
index 325b8b81e..eb943c2fd 100644
--- a/clickhouse-client/src/test/resources/containers/clickhouse-cluster/config.d/custom_config.xml
+++ b/clickhouse-client/src/test/resources/containers/clickhouse-cluster/config.d/custom_config.xml
@@ -116,4 +116,31 @@
     </user_directories>
 
     <allow_experimental_transactions>42</allow_experimental_transactions>
+
+    <!-- Of the system logs, tests read only system.query_log. Turn off the others. -->
+    <!-- Each replica would otherwise flush and merge them all the time. -->
+    <aggregated_zookeeper_log remove="1"/>
+    <asynchronous_insert_log remove="1"/>
+    <asynchronous_metric_log remove="1"/>
+    <background_schedule_pool_log remove="1"/>
+    <backup_log remove="1"/>
+    <blob_storage_log remove="1"/>
+    <crash_log remove="1"/>
+    <delta_lake_metadata_log remove="1"/>
+    <error_log remove="1"/>
+    <iceberg_metadata_log remove="1"/>
+    <instrumentation_trace_log remove="1"/>
+    <metric_log remove="1"/>
+    <opentelemetry_span_log remove="1"/>
+    <part_log remove="1"/>
+    <processors_profile_log remove="1"/>
+    <query_metric_log remove="1"/>
+    <query_thread_log remove="1"/>
+    <query_views_log remove="1"/>
+    <s3queue_log remove="1"/>
+    <session_log remove="1"/>
+    <text_log remove="1"/>
+    <trace_log remove="1"/>
+    <zookeeper_connection_log remove="1"/>
+    <zookeeper_log remove="1"/>
 </clickhouse>