config.xml

<?xml version="1.0"?>
<yandex>
        <logger>
                <level>warning</level>
                <log>/var/log/clickhouse-server/clickhouse-server.log</log>
                <errorlog>/var/log/clickhouse-server/clickhouse-server.err.log</errorlog>
                <size>100M</size>
                <count>10</count>
        </logger>
        <http_port>8123</http_port>
        <tcp_port>9000</tcp_port>
        <interserver_http_port>9009</interserver_http_port>
        <interserver_http_host>shardnreplicanhostname</interserver_http_host>
        <listen_host>0.0.0.0</listen_host>
        <max_connections>8192</max_connections>
        <keep_alive_timeout>3</keep_alive_timeout>
        <max_concurrent_queries>100</max_concurrent_queries>
        <uncompressed_cache_size>8589934</uncompressed_cache_size>
        <mark_cache_size>5368709</mark_cache_size>
        <path>/var/lib/clickhouse/</path>
        <tmp_path>/var/lib/clickhouse/tmp/</tmp_path>
        <users_config>users.xml</users_config>
        <default_profile>default</default_profile>
        <default_database>default</default_database>
        <timezone>UTC</timezone>

        <!-- Configuration of clusters that could be used in Distributed tables.
                 https://clickhouse.yandex/reference_en.html#Distributed
          -->
        <remote_servers>
                <metrics>
                        <shard>
                        <!-- Optional. Shard weight when writing data. By default, 1. -->
                        <weight>1</weight>
                        <!-- Optional. Whether to write data to just one of the replicas. By default, false - write data to all of the replicas. -->
                        <!-- NOTE: this is set to true because we're using a distributed table table points to a replicated table -->
                        <internal_replication>true</internal_replication>
                        <replica>
                                <host>shard1replica1host</host>
                                <port>9000</port>
                        </replica>
                        <replica>
                                <host>shard1replica2host</host>
                                <port>9000</port>
                        </replica>
                        </shard>
                        <shard>
                        <!-- Optional. Shard weight when writing data. By default, 1. -->
                        <weight>1</weight>
                        <!-- Optional. Whether to write data to just one of the replicas. By default, false - write data to all of the replicas. -->
                        <!-- NOTE: this is set to true because we're using a distributed table table points to a replicated table -->
                        <internal_replication>true</internal_replication>
                        <replica>
                                <host>shard2replica1host</host>
                                <port>9000</port>
                        </replica>
                        <replica>
                                <host>shard2replica2host</host>
                                <port>9000</port>
                        </replica>
                        </shard>
                </metrics>
        </remote_servers>

        <zookeeper>
                <node index="1">
                        <host>zkhost1</host>
                        <port>2181</port>
                </node>
                <node index="2">
                        <host>zkhost2</host>
                        <port>2181</port>
                </node>
                <node index="3">
                        <host>zkhost3</host>
                        <port>2181</port>
                </node>
        </zookeeper>


        <builtin_dictionaries_reload_interval>3600</builtin_dictionaries_reload_interval>
        <query_log>
                <database>system</database>
                <table>query_log</table>
                <flush_interval_milliseconds>7500</flush_interval_milliseconds>
        </query_log>
        <part_log>
                <database>system</database>
                <table>part_log</table>

                <flush_interval_milliseconds>7500</flush_interval_milliseconds>
        </part_log>
        <dictionaries_config>*_dictionary.xml</dictionaries_config>
        <compression incl="/etc/clickhouse-server/clickhouse_compression.xml">
        </compression>
        <resharding>
                <task_queue_path>/clickhouse/task_queue</task_queue_path>
        </resharding>

        <!-- Settings for the ReplicatedGraphiteMergeTree engine. 
            Adjust the retention and rollup entries as needed. -->
        <graphite_rollup>
                <path_column_name>tags</path_column_name>
                <time_column_name>ts</time_column_name>
                <value_column_name>val</value_column_name>
                <version_column_name>updated</version_column_name>
                <default>
                        <function>avg</function>
                        <retention>
                                <age>0</age>
                                <precision>10</precision>
                        </retention>
                        <retention>
                                <age>86400</age>
                                <precision>30</precision>
                        </retention>
                        <retention>
                                <age>172800</age>
                                <precision>300</precision>
                        </retention>
                </default>
        </graphite_rollup>
</yandex>