主要分为两大步骤：1、zookeeper安装；2、ck集群配置
===========================一、zookeeper安装========================
1、安装包下载
https://www.apache.org/dyn/closer.lua/zookeeper/zookeeper-3.6.1/apache-zookeeper-3.6.1-bin.tar.gz
2、解压并配置
a) tar -zxvf apache-zookeeper-3.6.1-bin.tar.gz -C /usr/java b）cp zoo_sample.cfg zoo.cfg c）vim zoo.cfg ,添加以下三个并修改dataDir目录 dataDir=/usr/java/zookeeper36/data server.1=hadoop101:2888:3888 server.2=hadoop102:2888:3888 server.3=hadoop103:2888:3888 d）每台机器都要创建并修改myid文件，具体的值对应与server.x echo 1 > dataDir=/usr/java/zookeeper36/data/myid e) scp -r zookeeper36 hadoop102:/usr/java
3、每台机器运行zk
a）每台机器运行 ./bin/zkServer.sh start b)查看每台机器的节点状态 ./bin/zkServer.sh status
如图显示，则表示成功安装！！！！
===========================二、clickhouse安装========================
1、首先单机安装，具体安装看下面链接
2、修改配置文件/etc/clickhouse-server/config.xml ；
listen_host 表示能监听的主机，:: 表示任意主机都可以访问 <listen_host>::</listen_host>
3、同步修改的配置文件
scp /etc/clickhouse-server/config.xml hadoop102:/etc/clickhouse-server/
scp /etc/clickhouse-server/config.xml hadoop103:/etc/clickhouse-server/
4、添加配置文件vim /etc/metrika.xml ，具体的主机名和端口按照自己的去修改。
注意:9000端口为/etc/clickhouse-server/config.xml文件中的tcp_port端口
<yandex> <clickhouse_remote_servers> <!-- 3分片1副本 --> <nx_clickhouse_3shards_1replicas> <shard> <!-- 数据自动同步 --> <internal_replication>true</internal_replication> <replica> <host>hadoop101</host> <port>9000</port> </replica> </shard> <shard> <internal_replication>true</internal_replication> <replica> <host>hadoop102</host> <port>9000</port> </replica> </shard> <shard> <internal_replication>true</internal_replication> <replica> <host>hadoop103</host> <port>9000</port> </replica> </shard> </nx_clickhouse_3shards_1replicas> </clickhouse_remote_servers> <!-- zookeeper 自动同步 --> <zookeeper-servers> <node index="1"> <host>hadoop101</host> <port>2181</port> </node> <node index="2"> <host>hadoop102</host> <port>2181</port> </node> <node index="3"> <host>hadoop103</host> <port>2181</port> </node> </zookeeper-servers> <!-- 配置文件中macros若省略，则建复制表时每个分片需指定zookeeper路径及副本名称，同一分片 上路径相同，副本名称不同；若不省略需每个分片不同配置 --> <macros> <replica>hadoop102</replica> </macros> <networks> <ip>::/0</ip> </networks> <!-- 配置压缩 --> <clickhouse_compression> <case> <min_part_size>10000000000</min_part_size> <min_part_size_ratio>0.01</min_part_size_ratio> <method>lz4</method> </case> </clickhouse_compression> </yandex>
5、同步添加的配置文件
scp /etc/metrika.xml hadoop102:/etc/
scp /etc/metrika.xml hadoop103:/etc/
6、分别启动这三台clickhouse-service
service clickhouse-server start
7、进入客户端，查看集群配置
1、clickhouse-client -m
2、select * from system.clusters;
如图所示，表示成功，也可查看其他机器的配置
8、查看错误日志
/var/log/clickhouse-server
===========================三、clickhouse集群测试========================
1、在三个节点分别创建本地表cluster3s1r_local
CREATE TABLE default.cluster3s1r_local
(
`id` Int32,
`website` String,
`wechat` String,
`FlightDate` Date,
Year UInt16
)
ENGINE = MergeTree(FlightDate, (Year, FlightDate), 8192);
2、在第一节点创建分布式表
CREATE TABLE default.cluster3s1r_all AS cluster3s1r_local
ENGINE = Distributed(nx_clickhouse_3shards_1replicas, default, cluster3s1r_local, rand());
3、往分布式表cluster3s1r_all中插入数据，cluster3s1r_all 会随机插入到三个节点的本地表(cluster3s1r_local)中
INSERT INTO default.cluster3s1r_all (id,website,wechat,FlightDate,Year)values(1,'https://niocoder.com/','java干货','2020-11-28',2020);
INSERT INTO default.cluster3s1r_all (id,website,wechat,FlightDate,Year)values(2,'http://www.merryyou.cn/','javaganhuo','2020-11-28',2020);
INSERT INTO default.cluster3s1r_all (id,website,wechat,FlightDate,Year)values(3,'http://www.xxxxx.cn/','xxxxx','2020-11-28',2020);
4、可以查看三个节点本地表的数据和分布式表的数据
# 查询总量查分布式表
select * from cluster3s1r_all;
#各机器节点的本地表
select * from cluster3s1r_local;
FAQ
如果出现下面的错误：
2021.01.26 11:00:38.392034 [ 6633 ] {} <Trace> Application: The memory map of clickhouse executable has been mlock'ed
2021.01.26 11:00:38.392351 [ 6633 ] {} <Error> Application: DB::Exception: Effective user of the process (root) does not match the owner of the data (clickhouse). Run under 'sudo -u clickhouse'.
2021.01.26 11:00:38.392383 [ 6633 ] {} <Information> Application: shutting down
2021.01.26 11:00:38.392389 [ 6633 ] {} <Debug> Application: Uninitializing subsystem: Logging Subsystem
2021.01.26 11:00:38.462977 [ 6636 ] {} <Trace> BaseDaemon: Received signal -2
2021.01.26 11:00:38.463026 [ 6636 ] {} <Information> BaseDaemon: Stop SignalListener thread
2021.01.26 11:02:00.469399 [ 6777 ] {} <Information> SentryWriter: Sending crash reports is disabled
2021.01.26 11:02:00.470907 [ 6777 ] {} <Trace> Pipe: Pipe capacity is 1.00 MiB
2021.01.26 11:02:00.509282 [ 6777 ] {} <Information> : Starting ClickHouse 20.8.3.18 with revision 54438, no build id, PID 6777
2021.01.26 11:02:00.509359 [ 6777 ] {} <Information> Application: starting up
2021.01.26 11:02:00.512996 [ 6777 ] {} <Trace> Application: Will mlockall to prevent executable memory from being paged out. It may take a few seconds.
2021.01.26 11:02:00.633075 [ 6777 ] {} <Trace> Application: The memory map of clickhouse executable has been mlock'ed
2021.01.26 11:02:00.633349 [ 6777 ] {} <Error> Application: DB::Exception: Effective user of the process (root) does not match the owner of the data (clickhouse). Run under 'sudo -u clickhouse'.
2021.01.26 11:02:00.633365 [ 6777 ] {} <Information> Application: shutting down
2021.01.26 11:02:00.633368 [ 6777 ] {} <Debug> Application: Uninitializing subsystem: Logging Subsystem
2021.01.26 11:02:00.682722 [ 6780 ] {} <Trace> BaseDaemon: Received signal -2
2021.01.26 11:02:00.682755 [ 6780 ] {} <Information> BaseDaemon: Stop SignalListener thread
解决方法：
1、暴力方法：
卸载这台机器clickhouse，重新安装、重新配置该机器的集群设置
具体卸载方法：
可以看 https://www.cnblogs.com/ywjfx/p/14305405.html
2、切换成clickhouse用户启动（我测试过，但是不奏效，所以才使用了暴力方法）
sudo -u clickhouse clickhouse-server --config-file=/etc/clickhouse-server/config.xml