clickhouse集群搭建

准备三台机器，192.168.20.7，192.168.20.8，192.168.20.10用于搭建clickhouse集群。本次搭建的集群，为三副本的，即一份数据会在三台机器上分别存储，搭建集群只是为了容灾。

1. 在192.168.20.7上操作

在clickhouse config.d目录下新建cluster.xml，内容如下

<clickhouse>

<keeper_server>

<tcp_port>9181</tcp_port>

<server_id>1</server_id>

<log_storage_path>/data/clickhouse/coordination/log</log_storage_path> <snapshot_storage_path>/data/clickhouse/coordination/snapshots</snapshot_storage_path>

<coordination_settings>

<operation_timeout_ms>10000</operation_timeout_ms>

<session_timeout_ms>30000</session_timeout_ms>

<raft_logs_level>trace</raft_logs_level>

</coordination_settings>

<raft_configuration>

<server>

<id>1</id>

<hostname>192.168.20.7</hostname>

<port>9234</port>

</server>

<server>

<id>2</id>

<hostname>192.168.20.8</hostname>

<port>9234</port>

</server>

<server>

<id>3</id>

<hostname>192.168.20.10</hostname>

<port>9234</port>

</server>

</raft_configuration>

</keeper_server>

<remote_servers>

<default>

<shard>

<internal_replication>1</internal_replication>

<replica>

<host>192.168.20.7</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.8</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.10</host>

<port>8124</port>

</replica>

</shard>

</default>

</remote_servers>

<macros>

<shard>1</shard>

<replica>192.168.20.7</replica>

</macros>

<interserver_http_host>192.168.20.7</interserver_http_host>

</clickhouse>

2. 在192.168.20.8上操作

<clickhouse>

<keeper_server>

<tcp_port>9181</tcp_port>

<server_id>2</server_id>

<log_storage_path>/data/clickhouse/coordination/log</log_storage_path> <snapshot_storage_path>/data/clickhouse/coordination/snapshots</snapshot_storage_path>

<coordination_settings>

<operation_timeout_ms>10000</operation_timeout_ms>

<session_timeout_ms>30000</session_timeout_ms>

<raft_logs_level>trace</raft_logs_level>

</coordination_settings>

<raft_configuration>

<server>

<id>1</id>

<hostname>192.168.20.7</hostname>

<port>9234</port>

</server>

<server>

<id>2</id>

<hostname>192.168.20.8</hostname>

<port>9234</port>

</server>

<server>

<id>3</id>

<hostname>192.168.20.10</hostname>

<port>9234</port>

</server>

</raft_configuration>

</keeper_server>

<remote_servers>

<default>

<shard>

<internal_replication>1</internal_replication>

<replica>

<host>192.168.20.7</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.8</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.10</host>

<port>8124</port>

</replica>

</shard>

</default>

</remote_servers>

<macros>

<shard>1</shard>

<replica>192.168.20.8</replica>

</macros>

<interserver_http_host>192.168.20.8</interserver_http_host>

</clickhouse>

修改了server_id，macros.replica、interserver_http_host三个配置项

3. 在192.168.20.10上操作

<clickhouse>

<keeper_server>

<tcp_port>9181</tcp_port>

<server_id>3</server_id>

<log_storage_path>/data/clickhouse/coordination/log</log_storage_path>

<snapshot_storage_path>/data/clickhouse/coordination/snapshots</snapshot_storage_path>

<coordination_settings>

<operation_timeout_ms>10000</operation_timeout_ms>

<session_timeout_ms>30000</session_timeout_ms>

<raft_logs_level>trace</raft_logs_level>

</coordination_settings>

<raft_configuration>

<server>

<id>1</id>

<hostname>192.168.20.7</hostname>

<port>9234</port>

</server>

<server>

<id>2</id>

<hostname>192.168.20.8</hostname>

<port>9234</port>

</server>

<server>

<id>3</id>

<hostname>192.168.20.10</hostname>

<port>9234</port>

</server>

</raft_configuration>

</keeper_server>

<remote_servers>

<default>

<shard>

<internal_replication>1</internal_replication>

<replica>

<host>192.168.20.7</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.8</host>

<port>8124</port>

</replica>

<replica>

<host>192.168.20.10</host>

<port>8124</port>

</replica>

</shard>

</default>

</remote_servers>

<macros>

<shard>1</shard>

<replica>192.168.20.10</replica>

</macros>

<interserver_http_host>192.168.20.10</interserver_http_host>

</clickhouse>

修改了server_id，macros.replica、interserver_http_host三个配置项

4. 启动

在三台机器上分别执行systemctl start clickhouse-server，启动clickhouse服务

启动成功之后，登录clickhouse执行语句，select * from system.clusters;可以看到三个节点，代表集群建立成功。

5.建表

clickhouse集群，需要在每个节点上分别建表，表结构如下所示

CREATE TABLE test.test1

(

`id` Int64

)

ENGINE = ReplicatedMergeTree('/clickhouse/tables/{shard}/test/test1', '{replica}')

ORDER BY id

SETTINGS index_granularity = 8192;

表建好之后，在其中一台节点执行insert后，在其它节点都可以看到该条数据。