基于clickhouse keeper搭建clickhouse集群

服务器信息

• hosts设置

# 切换成root
sudo -i
# my-db01 执行
echo '192.168.1.215 my-db02' >> /etc/hosts
echo '192.168.1.216 my-db03' >> /etc/hosts

# my-db02 执行
echo '192.168.1.214 my-db01' >> /etc/hosts
echo '192.168.1.216 my-db03' >> /etc/hosts

# my-db03 执行
echo '192.168.1.214 my-db01' >> /etc/hosts
echo '192.168.1.215 my-db02' >> /etc/hosts

安装

使用admin用户安装：

• 添加官方镜像

sudo yum install -y yum-utils
sudo yum-config-manager --add-repo https://packages.clickhouse.com/rpm/clickhouse.repo

• 安装clickhouse-server和clickhouse-client

sudo yum install -y clickhouse-server clickhouse-client

版本信息：

操作系统：CentOS Linux release 7.9.2009 (Core)

systemd：219

clickhouse-client：23.2.4.12-1.x86_64

clickhouse-server：23.2.4.12-1.x86_64

clickhouse-common-static：23.2.4.12-1.x86_64

• 安装nc命令，用于检查连通性

yum install -y nc

调整配置

目录调整

# 创建数据目录
sudo mkdir -p /data/clickhouse/lib
# 创建日志目录
sudo mkdir -p /data/clickhouse/log
# 授权
sudo chown -R clickhouse:clickhouse /data/clickhouse
sudo chmod 777 /data

# 备份原始配置文件
sudo cp /etc/clickhouse-server/users.xml ~
sudo cp /etc/clickhouse-server/config.xml ~

# 更改目录配置
## 权限更改
sudo chmod 666 /etc/clickhouse-server/config.xml
sudo chmod 666 /etc/clickhouse-server/users.xml
## 日志目录替换
sudo sed -i 's?/var/log/clickhouse-server?/data/clickhouse/log?g' /etc/clickhouse-server/config.xml
## 数据目录替换
sudo sed -i 's?/var/lib/clickhouse?/data/clickhouse/lib?g' /etc/clickhouse-server/config.xml

启停

• 修改sudo vi /usr/lib/systemd/system/clickhouse-server.service参考：《问题记录->启动超时》
• 设置自启动：sudo systemctl enable clickhouse-server
• 启动命令：sudo systemctl start clickhouse-server
• 关闭命令：sudo systemctl stop clickhouse-server
• 启动状态：sudo systemctl status clickhouse-server

参数调整

sudo vi /etc/clickhouse-server/config.xml中的配置：

• background_pool_size：默认16，可以调整到CPU个数的两倍。本次调整到32

• max_concurrent_queries：默认100，可以调整到200或者300。本次调整到200

• 设置外网(ipv4)可访问：
  <listen_host>0.0.0.0</listen_host>
  
  设置interserver_listen_host，因为服务器不支持ipv6
  (如果不设置，配置了clickhouse-keeper后，会无法启动，报错：
  RaftInstance: got exception: open: Address family not supported by protocol
  )
  <interserver_listen_host>0.0.0.0</interserver_listen_host>
  

users.xml中的配置：

• 密码设置：

# 使用下述命令生成随机密码
PASSWORD=$(base64 < /dev/urandom | head -c12); echo "$PASSWORD"; echo -n "$PASSWORD" | sha256sum | tr -d '-'
# 明文密码：z+yJwbcWv6MA
# 密文密码：b53ad819c11d5790655464f2d6ec0e78916551b62141fec0d1342a25138082d2

<password_sha256_hex>b53ad819c11d5790655464f2d6ec0e78916551b62141fec0d1342a25138082d2</password_sha256_hex>

上述配置在每个节点都需要设置

服务器调整

• 不禁用overcommit

echo 0 | sudo tee /proc/sys/vm/overcommit_memory

• 始终禁用透明大页(transparent huge pages)。 它会干扰内存分配器，从而导致显着的性能下降。

# 使用root
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
echo 'echo never > /sys/kernel/mm/transparent_hugepage/defrag' >> /etc/rc.d/rc.local
echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.d/rc.local
sudo chmod +x /etc/rc.d/rc.local

• 禁用swap（官方建议：We recommend to disable the operating system’s swap file in production environments.）

1. sudo swapoff -a
2. echo "vm.swappiness = 0">> /etc/sysctl.conf
3. sudo sysctl -p
4. sudo vi /etc/fstab # 注释swap那一行

集群搭建

• 最小三台为一个集群
• 基于clickhouse-keeper搭建集群
• 搭建集群之前，三台服务器都需要按照上文所示，安装好clickhouse

clickhouse-keeper配置

在每台clickhouse服务器中的/etc/clickhouse-server/config.d/目录下新建clickhouse-keeper.xml，内容如下：

<clickhouse>
<keeper_server>
    <tcp_port>9181</tcp_port>
    <server_id>1</server_id>
    <log_storage_path>/data/clickhouse/lib/coordination/log</log_storage_path>
    <snapshot_storage_path>/data/clickhouse/lib/coordination/snapshots</snapshot_storage_path>

    <coordination_settings>
        <operation_timeout_ms>10000</operation_timeout_ms>
        <session_timeout_ms>30000</session_timeout_ms>
        <raft_logs_level>warning</raft_logs_level>
    </coordination_settings>

    <raft_configuration>
        <server>
            <id>1</id>
            <hostname>my-db01</hostname>
            <port>9444</port>
        </server>
        <server>
            <id>2</id>
            <hostname>my-db02</hostname>
            <port>9444</port>
        </server>
        <server>
            <id>3</id>
            <hostname>my-db03</hostname>
            <port>9444</port>
        </server>
    </raft_configuration>
</keeper_server>
      <zookeeper>
        <node>
            <host>my-db01</host>
            <port>9181</port>
        </node>
        <node>
            <host>my-db02</host>
            <port>9181</port>
        </node>
        <node>
            <host>my-db03</host>
            <port>9181</port>
        </node>
    </zookeeper>
</clickhouse>

注意事项：

1. 每个节点server_id配置正确
2. log_storage_path和snapshot_storage_path目录正确
3. 端口能访问
4. 文件授权：chown clickhouse:clickhouse /etc/clickhouse-server/config.d/clickhouse-keeper.xml

本次搭建情况如下：

1. my-db01的server_id为1、my-db02的server_id为2、my-db03的server_id为3
2. 开放端口9181、9444

• 检查keeper是否正常,返回imok表示正常

echo ruok | nc localhost 9181; echo
# imok

集群配置

集群设置为：0分片3副本的结构

配置如下（将该配置追加到clickhouse-keeper.xml文件中）：

   <!-- <macros>
        <shard>${建议设置成集群名+分片名}，例如：cluster_3S_1R_01</shard>
        <replica>${建议设置为主机名}，例如：my-db01</replica>
    </macros> -->
		<macros>
        <shard>cluster_1S_3R_01</shard>
        <replica>my-db01</replica>
    </macros>
		<remote_servers>
        <cluster_1S_3R>
            <shard>
                <replica>
                    <host>my-db01</host>
                    <port>9000</port>
                    <user>default</user>
                </replica>
                <replica>
                    <host>my-db02</host>
                    <port>9000</port>
                    <user>default</user>
                </replica>
                <replica>
                    <host>my-db03</host>
                    <port>9000</port>
                    <user>default</user>
                </replica>
            </shard>
        </cluster_1S_3R>
    </remote_servers>

问题记录

启动超时

安装完之后，通过命令sudo systemctl start clickhouse-server无法正常启动，日志如下：

● clickhouse-server.service - ClickHouse Server (analytic DBMS for big data)
   Loaded: loaded (/usr/lib/systemd/system/clickhouse-server.service; enabled; vendor preset: disabled)
   Active: activating (auto-restart) (Result: timeout) since Tue 2023-03-21 16:59:02 CST; 6s ago
  Process: 12585 ExecStart=/usr/bin/clickhouse-server --config=/etc/clickhouse-server/config.xml --pid-file=%t/%p/%p.pid (code=killed, signal=TERM)
 Main PID: 12585 (code=killed, signal=TERM)

Mar 21 16:59:02 my-db02 systemd[1]: Failed to start ClickHouse Server (analytic DBMS for big data).
Mar 21 16:59:02 my-db02 systemd[1]: Unit clickhouse-server.service entered failed state.
Mar 21 16:59:02 my-db02 systemd[1]: clickhouse-server.service failed.

看出是timeout导致的，翻阅资料后发现问题：

1. /usr/lib/systemd/system/clickhouse-server.service文件中超时设置，使用的是：TimeoutStartSec=infinity

2. 通过systemctl --version查看systemd的版本为219

3. TimeoutStartSec 的infinity设置是229版本之后才有的，229之前设置为0，来禁用超时

这里提供一份修改过的clickhouse-server.service文件，可供参考

[Unit]
Description=ClickHouse Server (analytic DBMS for big data)
Requires=network-online.target
# NOTE: that After/Wants=time-sync.target is not enough, you need to ensure
# that the time was adjusted already, if you use systemd-timesyncd you are
# safe, but if you use ntp or some other daemon, you should configure it
# additionaly.
After=time-sync.target network-online.target
Wants=time-sync.target

[Service]
Type=notify
# NOTE: we leave clickhouse watchdog process enabled to be able to see OOM/SIGKILL traces in clickhouse-serv
er.log files.
# If you wish to disable the watchdog and rely on systemd logs just add "Environment=CLICKHOUSE_WATCHDOG_ENABLE=0" line.
User=clickhouse
Group=clickhouse
Restart=always
RestartSec=30
# Since ClickHouse is systemd aware default 1m30sec may not be enough
# TimeoutStartSec=infinity
TimeoutStartSec=0
# %p is resolved to the systemd unit name
RuntimeDirectory=%p 
ExecStart=/usr/bin/clickhouse-server --config=/etc/clickhouse-server/config.xml --pid-file=%t/%p/%p.pid
# Minus means that this file is optional.
EnvironmentFile=-/etc/default/%p
# Bring back /etc/default/clickhouse for backward compatibility
EnvironmentFile=-/etc/default/clickhouse
LimitCORE=infinity
LimitNOFILE=500000
CapabilityBoundingSet=CAP_NET_ADMIN CAP_IPC_LOCK CAP_SYS_NICE CAP_NET_BIND_SERVICE

[Install]
# ClickHouse should not start from the rescue shell (rescue.target).
WantedBy=multi-user.target

注意事项：

如果已经启动失败，修改后systemd相关文件后，需要执行systemctl daemon-reload

参考文档

安装：https://clickhouse.com/docs/en/install#from-rpm-packages

使用建议：https://clickhouse.com/docs/en/operations/tips

关闭swap：https://blog.csdn.net/weixin_43224440/article/details/111556962

参数调优：https://blog.csdn.net/qq_35128600/article/details/125897196

集群搭建参考：https://clickhouse.com/docs/en/guides/sre/keeper/clickhouse-keeper#clickhouse-keeper-user-guide

不支持ipv6参考：https://github.com/ClickHouse/ClickHouse/issues/33381文章来源地址https://www.toymoban.com/news/detail-657758.html

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