TDengine cluster construction

I use three servers to build a cluster here

1.If it has been installed before on the physical nodes of the clusterTDengine,Uninstall first

直接执行以下4条命令

rmtaos
rm -rf /var/lib/taos
rm -rf /var/log/taos
rm -rf /etc/taos

（参考：https://www.taosdata.com/blog/2019/08/09/566.html)

2.Make sure all hosts in the cluster are on the port 6030-6042 上的 TCP/UDP Protocols can communicate with each other

Execute the following commands on each server individually

firewall-cmd --permanent --zone=public --add-port=6030-6042/tcp

firewall-cmd --permanent --zone=public --add-port=6030-6042/udp

firewall-cmd --reload

3.修改主机名和hosts文件

（1）修改主机名
在三台服务器上分别执行：

hostnamectl set-hostname td1.test.com

hostnamectl set-hostname td2.test.com

hostnamectl set-hostname td3.test.com

Check whether the modification of the host name is successful：

hostname -f

（2）修改hosts文件

vi /etc/hosts

将下面三行添加到hosts文件中（All three hosts do this）
将xxx.xUse your own serverip替换下

192.168.xxx.a td1.test.com
192.168.xxx.b td2.test.com
192.168.xxx.c td3.test.com

Executed on each physical node ping host,其中 host of other physical nodes hostname,确保能 ping through other physical nodes

比如:
在td1.test.com上执行ping td2.test.com,ping td3.test.com
在td2.test.com上执行ping td1.test.com,ping td3.test.com
在td3.test.com上执行ping td1.test.com,ping td2.test.com

ping td2.test.com

4.同步服务器时间

(1)修改时区配置文件
First, you can look at the current time zone configuration

timedatectl 

If the current time zone is not the time zone you want,Then modify the time zone configuration file

#删除当前默认时区的配置文件,不建议直接删除（出于操作安全考虑）,最好是使用mv命令重命名
rm -rf /etc/localtime 
 
#建立软连接文件到配置文件区,替换掉之前删掉或备份的/etc/localtime 文件
ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 
#查看当前时区
timedatectl
 
#设置当前时区为上海
timedatectl set-timezone Asia/Shanghai 

（2）同步时间

# 安装工具
yum -y install ntp ntpdate
 #同步时间服务器
ntpdate cn.pool.ntp.org

5.安装

（1）去官方（https://tdengine.com/all-downloads）下载安装包

After clicking the compressed package to be downloaded, a pop-up window will appear,let you fill in your email,After filling in the email,会收到邮件,The actual download address will be attached to the content of the email,Click the email address in the email content to download.
下载完成后,利用xFtp将压缩包上传到服务器
（2）解压

tar zvxf TDengine-server-2.6.0.1-Linux-x64.tar.gz

（3）安装

cd /TDengine-server-2.6.0.1

./install.sh

安装第一个节点td1When encountering this kind of direct carriage return

Install the second nodetd2和第三个节点td3needs to be filled intd1.test.com:6030（This step can also be directly returned,You can also configure it when you modify the configuration file below

6.配置

输入命令

cd /usr/local/taos/cfg
vi taos.cfg

修改td1配置文件taos.cfg如下（一共修改7处地方,Everywhere I marked with numbers）

td2和td3This also needs to be modified7处,Just the second placefqdn的值不同
td2In the second place, modify it to td2.test.com
td3In the second place, modify it to td3.test.com

7.启动

Execute the command separately on the three servers：

# 启动服务
sudo systemctl start taosd

You can check the status with this command

sudo systemctl status taosd

(进入数据库命令：taos,退出数据库命令：exit)

7.创建节点

在td1或td2或td3上创建dnode节点,It only needs to be created on one node.
我在td1上创建节点

# 进入数据库
taos
# 创建节点
CREATE DNODE "td2.test.com:6030";
CREATE DNODE "td3.test.com:6030";

（1）查看dnode

show dnodes;

（2）查看mnode

show mnodes;

Stop the node running the command

systemctl stop taosd

One of the nodes is down,就是下图这种（Two nodes are down）

参考文章：https://www.wangt.cc/2021/08/tdengine%E7%9A%84%E5%AE%9E%E9%99%85%E4%BD%BF%E7%94%A8/