根据文档搭建...https://dev.MySQL.com/doc/refman/8.0/en/mysql-innodb-cluster-production-deployment.html

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环境准备:
1 下载和安装需要的软件(本人的软件版本--都是mysql Community中的Linux Generic版本)
mysql-server(mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz)
mysql-router(mysql-router-8.0.17-linux-glibc2.12-x86_64.tar.xz)
mysql-shell(mysql-shell-8.0.17-linux-glibc2.12-x86-64bit.tar.gz)

安装(以mysql server为例，其他类似,以下都是Mysql_tar操作系统用户操作):
cd /home/mysql_tar
tar -xvf mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz
ln -s mysql-8.0.17-linux-glibc2.12-x86_64 mysql_install(方便升级)
...mysql-router...
....mysql_shell...

2. 编辑环境变量:
   vim /home/mysql_tar/.bash_profile
   #FOR MYSQL
   MYSQL_HOME=/home/mysql_tar/mysql_install
   PATH=$PATH:$MYSQL_HOME/bin
   export MYSQL_HOME

#MYSQL SHELL
MYSQL_SHELL_HOME=/home/mysql_tar/mysql_shell
PATH=$PATH:$MYSQL_SHELL_HOME/bin
export MYSQL_SHELL_HOME

#MYSQL_ROUTER
MYSQL_ROUTER=/home/mysql_tar/mysql_router
PATH=$PATH:$MYSQL_ROUTER/bin
export MYSQL_ROUTER

export PATH

3. 准备mysql 配置文件my.cnf
   vim /etc/my.cnf

default-authentication-plugin=mysql_native_password
lower_case_table_names=1
datadir=/data_test
socket=/data_test/mysql.sock
log-error=/data_test/mysqld.log
pid-file=/data_test/mysqld.pid

4. 创建数据目录文件/data_test(用户和用户组均为mysql_tar)
5. 初始化mysql
   cd /home/mysql_tar/mysql_install/bin(环境变量设置正确，该步可有可无)
   ./mysqld --initialize --user=mysql_tar(初始化mysql系统表空间和其他重要文件，initialize 拼错的话不会报错，只会提示数据目录找不到)
6. 启动Mysql
   mysqld_safe --user=mysql_tar &
7. 连接Mysql并且修改root账户密码:
   ./mysql -u root -S /data_test/mysql.sock -p(也可以通过TCP/IP登陆，这里通过套接字登陆)
   mysql>alter user root@localhost identified by 'mjj';
8. 通过mysqlsh登陆mysql、检查环境并创建集群
   /home/mysql_tar/mysql_shell/bin/mysqlsh
   MySQL SQL > \connect root@mysql_host_a(加粗的是我的命令)
   Creating a session to 'root@mysql_host_a'
   Please provide the password for 'root@mysql_host_a': *
   Save password for 'root@mysql_host_a'? [Y]es/[N]o/Ne[v]er (default No): ~~
   MySQL mysql_host_a:33060+ ssl JS > dba.checkInstanceConfiguration();
   Validating local MySQL instance listening at port 3306 for use in an InnoDB cluster...**

This instance reports its own address as mysql_host_a:3306
Clients and other cluster members will communicate with it through this address by default. If this is not correct, the report_host MySQL system variable should be changed.

Checking whether existing tables comply with Group Replication requirements...
No incompatible tables detected

Checking instance configuration...

NOTE: Some configuration options need to be fixed:
+--------------------------+---------------+----------------+--------------------------------------------------+
| Variable | Current Value | Required Value | Note |
+--------------------------+---------------+----------------+--------------------------------------------------+
| binlog_checksum | CRC32 | NONE | Update the server variable |
| enforce_gtid_consistency | OFF | ON | Update read-only variable and restart the server |
| gtid_mode | OFF | ON | Update read-only variable and restart the server |
| server_id | 1 | | Update read-only variable and restart the server |
+--------------------------+---------------+----------------+--------------------------------------------------+

Some variables need to be changed, but cannot be done dynamically on the server.
NOTE: Please use the dba.configureInstance() command to repair these issues.

{
"config_errors": [
{
"action": "server_update",
"current": "CRC32",
"option": "binlog_checksum",
"required": "NONE"
},
{
"action": "server_update+restart",
"current": "OFF",
"option": "enforce_gtid_consistency",
"required": "ON"
},
{
"action": "server_update+restart",
"current": "OFF",
"option": "gtid_mode",
"required": "ON"
},
{
"action": "server_update+restart",
"current": "1",
"option": "server_id",
"required": ""
}
],
"status": "error"
}
MySQL mysql_host_a:33060+ ssl JS > \exit
Bye!

根据错误往/etc/my.cnf添加以下参数:
#for innodb cluster
binlog_checksum=none
enforce_gtid_consistency=on
gtid_mode=on
server_id=1234

9. 创建集群
   MySQL mysql_host_a:33060+ ssl JS > var cluster = dba.createCluster('mjjcluster');
   A new InnoDB cluster will be created on instance 'mysql_host_a:3306'.

Validating instance at mysql_host_a:3306...

This instance reports its own address as mysql_host_a:3306

Instance configuration is suitable.
Creating InnoDB cluster 'mjjcluster' on 'mysql_host_a:3306'...

Adding Seed Instance...
Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.
At least 3 instances are needed for the cluster to be able to withstand up to
one server failure.

10 可以通过cluster.status();命令查看集群状态
MySQL mysql_host_a:33060+ ssl JS > cluster.status();
{
"clusterName": "mjjcluster",
"defaultReplicaSet": {
"name": "default",
"primary": "mysql_host_a:3306",
"ssl": "REQUIRED",
"status": "OK_NO_TOLERANCE",
"statusText": "Cluster is NOT tolerant to any failures.",
"topology": {
"mysql_host_a:3306": {
"address": "mysql_host_a:3306",
"mode": "R/W",
"readReplicas": {},
"role": "HA",
"status": "ONLINE",
"version": "8.0.17"
}
},
"topologyMode": "Single-Primary"
},
"groupInformationSourceMember": "mysql_host_a:3306"
}

11, 其他机子也安装软件和准备环境(dba.checkInstanceConfiguration()通过即可，步骤与主节点类似)

12. 加入节点:
    MySQL mysql_host_a:33060+ ssl JS > cluster.addInstance('root@mysql_host_b:3306');(本人另一台机子的主机名是mysql_host_b)
    Cluster.addInstance: Connection 'root@mysql_host_b:3306' is not valid: unable to resolve the IPv4 address. (ArgumentError)
    MySQL mysql_host_a:33060+ ssl JS > cluster.addInstance('root@mysql_host_b:3306');
    Please provide the password for 'root@mysql_host_b:3306': ***
    Save password for 'root@mysql_host_b:3306'? [Y]es/[N]o/Ne[v]er (default No):

NOTE: The target instance 'mysql_host_b:3306' has not been pre-provisioned (GTID set
is empty). The Shell is unable to decide whether incremental distributed state
recovery can correctly provision it.
The safest and most convenient way to provision a new instance is through
automatic clone provisioning, which will completely overwrite the state of
'mysql_host_b:3306' with a physical snapshot from an existing cluster member.
To use this method by default, set the 'recoveryMethod' option to 'clone'.

The incremental distributed state recovery may be safely used if you are sure
all updates ever executed in the cluster were done with GTIDs enabled, there
are no purged transactions and the new instance contains the same GTID set as
the cluster or a subset of it. To use this method by default, set the
'recoveryMethod' option to 'incremental'.

Please select a recovery method [C]lone/[I]ncremental recovery/[A]bort (default Clone):
Validating instance at mysql_host_b:3306...

This instance reports its own address as mysql_host_b:3306

Instance configuration is suitable.
A new instance will be added to the InnoDB cluster. Depending on the amount of
data on the cluster this might take from a few seconds to several hours.

Adding instance to the cluster...

Monitoring recovery process of the new cluster member. Press ^C to stop monitoring and let it continue in background.
Clone based state recovery is now in progress.

NOTE: A server restart is expected to happen as part of the clone process. If the
server does not support the RESTART command or does not come back after a
while, you may need to manually start it back.

• Waiting for clone to finish...
  NOTE: mysql_host_b:3306 is being cloned from mysql_host_a:3306
  Stage DROP DATA: Completed
  Clone Transfer
  FILE COPY ############################################################ 100% Completed
  PAGE COPY ############################################################ 100% Completed
  REDO COPY ############################################################ 100% Completed

NOTE: mysql_host_b:3306 is shutting down...

• Waiting for server restart... ready
• mysql_host_b:3306 has restarted, waiting for clone to finish...
  ** Stage RESTART: Completed
• Clone process has finished: 58.50 MB transferred in about 1 second (~inf TB/s)

State recovery already finished for 'mysql_host_b:3306'

The instance 'mysql_host_b:3306' was successfully added to the cluster.

。。。完成了，基本的步骤就这些吧。
主要方法:
dba.configureInstance()

dba.createCluster()

Cluster.addInstance()----cluster=dba.getCluster()获取cluster变量

Cluster.removeInstance()

Cluster.rejoinInstance()

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