MySQL 5.7.18 master-slave replication setup (one master and one slave) tutorial detailed explanation

GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%' IDENTIFIED BY 'repl@20170509';

server-id = 245
log_bin = /data/mysqllog/3306/bin_log/binlog

mysqldump -uroot -p'password' --master-data=2 --single-transaction -R --triggers -A > /backup/all.sql

SHOW MASTER STATUS;
mysql> SHOW MASTER STATUS;
+---------------+----------+-------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+-------------+------------------+-------------------+
| binlog.000004 | 79394496 | | | |
+---------------+----------+-------------+------------------+-------------------+

server-id = 247 (unique, cannot be the same as the main database, usually set to the last 3 digits of the server IP)
log_bin = /data/mysql/logdir/3306/bin_log/binlog
innodb_file_per_table = ON
skip_name_resolve = ON
relay_log = /data/mysql/logdir/3306/relay_log/relay.log
binlog-format = row
log-slave-updates = true

mysql -u root -p 'password' < all.sql

mysql> stop slave; #Stop slavemysql>CHANGE MASTER TO MASTER_HOST='172.16.115.245',MASTER_USER='repl', MASTER_PASSWORD='repl@20170509',MASTER_LOG_FILE='binlog.000004',MASTER_LOG_POS=154;
mysql> start slave; #Start replicationmysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.16.115.245
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000004
Read_Master_Log_Pos: 104634190
Relay_Log_File: relay.000003
Relay_Log_Pos: 104632819
Relay_Master_Log_File: binlog.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: 
Replicate_Ignore_DB: 
Replicate_Do_Table: 
Replicate_Ignore_Table: 
Replicate_Wild_Do_Table: 
Replicate_Wild_Ignore_Table: 
Last_Errno: 0
Last_Error: 
Skip_Counter: 0
Exec_Master_Log_Pos: 104634190
Relay_Log_Space: 104634713
Until_Condition: None
Until_Log_File: 
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File: 
Master_SSL_CA_Path: 
Master_SSL_Cert: 
Master_SSL_Cipher: 
Master_SSL_Key: 
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error: 
Last_SQL_Errno: 0
Last_SQL_Error: 
Replicate_Ignore_Server_Ids: 
Master_Server_Id: 245
Master_UUID: 4f545573-3170-11e7-b903-000c29462d8c
Master_Info_File: /data/mysql/datadir/3306/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay logs; waiting for more updates
Master_Retry_Count: 86400
Master_Bind: 
Last_IO_Error_Timestamp: 
Last_SQL_Error_Timestamp: 
Master_SSL_Crl: 
Master_SSL_Crlpath: 
Retrieved_Gtid_Set: 
Executed_Gtid_Set: 
Auto_Position: 0
Replicate_Rewrite_DB: 
Channel_Name: 
Master_TLS_Version:

mysql> SHOW PROCESSLIST \G
*************************** 1. row ***************************
Id: 13
User: repl
Host: 172.16.115.247:44602
db: NULL
Command: Binlog Dump
Time: 76514
State: Master has sent all binlog to slave; waiting for more updates
Info: NULL

mysql> SHOW PROCESSLIST \G
*************************** 1. row ***************************
Id: 10
User: system user
Host: 
db: NULL
Command: Connect
Time: 81148
State: Waiting for master to send event
Info: NULL
*************************** 2. row ***************************
Id: 12
User: system user
Host: 
db: NULL
Command: Connect
Time: 5
State: Reading event from the relay log
Info: NULL