mysql 8.0.18 mgr installation and its switching function

yum -y install make gcc-c++ cmake bison-devel ncurses-devel readline-devel libaio-devel perl libaio wget lrzsz vim libnuma* bzip2 xz

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce 0

/etc/init.d/iptables stop

echo "/etc/init.d/iptables stop">>/etc/rc.local

cat >> /etc/security/limits.conf << EOF
#
###custom
#
* soft nofile 20480
* hard nofile 65535
* soft nproc 20480
* hard nproc 65535
EOF

cat >> /etc/hosts <<"EOF"

10.10.146.28 bj-db-m1 
10.10.1.139 bj-db-m2 
10.10.173.84 bj-db-m3 

EOF

cat >>/etc/sysctl.conf <<"EOF"
vm.swappiness=0
#Increase the number of queues supported by TCP net.ipv4.tcp_max_syn_backlog = 65535
#Reduce resource recycling when disconnecting net.ipv4.tcp_max_tw_buckets = 8000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 10
#Change the local port range net.ipv4.ip_local_port_range = 1024 65535
#Allow more connections to enter the queue net.ipv4.tcp_max_syn_backlog = 4096 
#For a database server that is only used locally net.ipv4.tcp_fin_timeout = 30
#Port monitoring queue net.core.somaxconn=65535
#Data receiving rate net.core.netdev_max_backlog=65535
net.core.wmem_default=87380
net.core.wmem_max=16777216
net.core.rmem_default=87380
net.core.rmem_max=16777216
EOF

sysctl -p

wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# Unzip the installation package tar -xJf mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# Enter the directory and make a soft link to facilitate future upgrades cd /usr/local/
ln -s /opt/mysql-8.0.18-linux-glibc2.12-x86_64 mysql
# Create user groupadd mysql
useradd -g mysql mysql -d /home/mysql -s /sbin/nologin

# Create the corresponding directory mkdir -p /data/mysql/mysql_3306/{logs,tmp,undolog}

# First if [ -f /etc/my.cnf ]; then
 mv /etc/my.cnf /etc/my.cnf.`date +%Y%m%d%H%m`.bak
fi 
# node1
cat >/data/mysql/mysql_3306/my_3306.cnf <<"EOF"
[client]
port = 3306
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock

[mysql]
prompt="\u@\h \R:\m:\s [\d]> "
no-auto-rehash

[mysqld]
user = mysql
port = 3306
admin_address = 127.0.0.1
basedir = /usr/local/mysql
datadir = /data/mysql/mysql_3306/data
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock
pid-file = mysql_3306.pid
character-set-server = utf8mb4
skip_name_resolve = 1

#replicate-wild-ignore-table=mysql.%
#replicate-wild-ignore-table=test.%
#replicate-wild-ignore-table=information_schema.%

# Two-Master configure
#server-1 
#auto-increment-offset = 1
#auto-increment-increment = 2 

#server-2    
#auto-increment-offset = 2
#auto-increment-increment = 2


# semi sync replication settings #
#plugin_dir = /usr/local/mysql/lib/mysql/plugin
#plugin_load = "validate_password.so;rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
plugin_dir = /usr/local/mysql/lib/plugin #Official version path plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #Official version path slave_parallel_workers = 4
slave_parallel_type = LOGICAL_CLOCK
slave_preserve_commit_order = 1

open_files_limit = 65535
back_log = 1024
max_connections = 1024
max_connect_errors = 1000000
table_open_cache = 1024
table_definition_cache = 1024
table_open_cache_instances = 64
thread_stack = 512K
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 1536
interactive_timeout = 600
wait_timeout = 600
tmp_table_size = 32M
max_heap_table_size = 32M
slow_query_log = 1
log_timestamps = SYSTEM
slow_query_log_file = /data/mysql/mysql_3306/logs/slow.log
log-error = /data/mysql/mysql_3306/logs/error.log
long_query_time = 0.1
log_queries_not_using_indexes = 1
log_throttle_queries_not_using_indexes = 60
min_examined_row_limit = 100
log_slow_admin_statements = 1
log_slow_slave_statements = 1
server-id = 1423306
log-bin = /data/mysql/mysql_3306/logs/mysql-bin
sync_binlog = 1
binlog_cache_size = 4M
max_binlog_cache_size = 2G
max_binlog_size = 1G
binlog_expire_logs_seconds=2592000 
master_info_repository = TABLE
relay_log_info_repository = TABLE
gtid_mode = on
enforce_gtid_consistency = 1
binlog_checksum=NONE
log_slave_updates
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'
binlog_format = row
binlog_row_image=FULL

relay_log_recovery = 1
relay-log-purge = 1
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
lock_wait_timeout = 3600
explicit_defaults_for_timestamp = 1
innodb_thread_concurrency = 0
innodb_sync_spin_loops = 100
innodb_spin_wait_delay = 30

#transaction_isolation = REPEATABLE-READ
transaction_isolation = READ-COMMITTED
#innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 2867M
innodb_buffer_pool_instances = 4
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_data_file_path = ibdata1:1G:autoextend
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 32M
innodb_log_file_size = 2G
innodb_log_files_in_group = 3
innodb_max_undo_log_size = 4G
innodb_undo_directory = /data/mysql/mysql_3306/undolog

# Adjust according to your server IOPS capability. # If you use a normal SSD, you can adjust it to 10,000 - 20,000.
# If you configure a high-end PCIe SSD card, you can adjust it higher, such as 50000 - 80000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_sync = 0
innodb_flush_neighbors = 0
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_purge_threads = 4
innodb_page_cleaners = 4
innodb_open_files = 65535
innodb_max_dirty_pages_pct = 50
innodb_flush_method = O_DIRECT
innodb_lru_scan_depth = 4000
innodb_checksum_algorithm = crc32
innodb_lock_wait_timeout = 10
innodb_rollback_on_timeout = 1
innodb_print_all_deadlocks = 1
innodb_file_per_table = 1
innodb_online_alter_log_max_size = 4G
innodb_stats_on_metadata = 0

# some var for MySQL 8
log_error_verbosity = 3
innodb_print_ddl_logs = 1
binlog_expire_logs_seconds = 2592000
#innodb_dedicated_server = 0

innodb_status_file = 1
# Note: Enabling innodb_status_output & innodb_status_output_locks may cause the log-error file to grow faster innodb_status_output = 0
innodb_status_output_locks = 0

#performance_schema
performance_schema = 1
performance_schema_instrument = '%memory%=on'
performance_schema_instrument = '%lock%=on'

#innodb monitor
innodb_monitor_enable="module_innodb"
innodb_monitor_enable="module_server"
innodb_monitor_enable="module_dml"
innodb_monitor_enable="module_ddl"
innodb_monitor_enable="module_trx"
innodb_monitor_enable="module_os"
innodb_monitor_enable="module_purge"
innodb_monitor_enable="module_log"
innodb_monitor_enable="module_lock"
innodb_monitor_enable="module_buffer"
innodb_monitor_enable="module_index"
innodb_monitor_enable="module_ibuf_system"
innodb_monitor_enable="module_buffer_page"
innodb_monitor_enable="module_adaptive_hash"

#MGR
: : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :
quick
max_allowed_packet = 32M

[mysqld_safe]
#malloc-lib=/usr/local/mysql/lib/jmalloc.so 
nice=-19
open-files-limit=65535

EOF

# Second machineif [ -f /etc/my.cnf ]; then
 mv /etc/my.cnf /etc/my.cnf.`date +%Y%m%d%H%m`.bak
fi 
# node1
cat >/data/mysql/mysql_3306/my_3306.cnf <<"EOF"
[client]
port = 3306
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock

[mysql]
prompt="\u@\h \R:\m:\s [\d]> "
no-auto-rehash

[mysqld]
user = mysql
port = 3306
admin_address = 127.0.0.1
basedir = /usr/local/mysql
datadir = /data/mysql/mysql_3306/data
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock
pid-file = mysql_3306.pid
character-set-server = utf8mb4
skip_name_resolve = 1

#replicate-wild-ignore-table=mysql.%
#replicate-wild-ignore-table=test.%
#replicate-wild-ignore-table=information_schema.%

# Two-Master configure
#server-1 
#auto-increment-offset = 1
#auto-increment-increment = 2 

#server-2    
#auto-increment-offset = 2
#auto-increment-increment = 2


# semi sync replication settings #
#plugin_dir = /usr/local/mysql/lib/mysql/plugin
#plugin_load = "validate_password.so;rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
plugin_dir = /usr/local/mysql/lib/plugin #Official version path plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #Official version path slave_parallel_workers = 4
slave_parallel_type = LOGICAL_CLOCK
slave_preserve_commit_order = 1

open_files_limit = 65535
back_log = 1024
max_connections = 1024
max_connect_errors = 1000000
table_open_cache = 1024
table_definition_cache = 1024
table_open_cache_instances = 64
thread_stack = 512K
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 1536
interactive_timeout = 600
wait_timeout = 600
tmp_table_size = 32M
max_heap_table_size = 32M
slow_query_log = 1
log_timestamps = SYSTEM
slow_query_log_file = /data/mysql/mysql_3306/logs/slow.log
log-error = /data/mysql/mysql_3306/logs/error.log
long_query_time = 0.1
log_queries_not_using_indexes = 1
log_throttle_queries_not_using_indexes = 60
min_examined_row_limit = 100
log_slow_admin_statements = 1
log_slow_slave_statements = 1
server-id = 1433306
log-bin = /data/mysql/mysql_3306/logs/mysql-bin
sync_binlog = 1
binlog_cache_size = 4M
max_binlog_cache_size = 2G
max_binlog_size = 1G
binlog_expire_logs_seconds=2592000 
master_info_repository = TABLE
relay_log_info_repository = TABLE
gtid_mode = on
enforce_gtid_consistency = 1
binlog_checksum=NONE
log_slave_updates
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'
binlog_format = row
binlog_row_image=FULL

relay_log_recovery = 1
relay-log-purge = 1
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
lock_wait_timeout = 3600
explicit_defaults_for_timestamp = 1
innodb_thread_concurrency = 0
innodb_sync_spin_loops = 100
innodb_spin_wait_delay = 30

#transaction_isolation = REPEATABLE-READ
transaction_isolation = READ-COMMITTED
#innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 2867M
innodb_buffer_pool_instances = 4
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_data_file_path = ibdata1:1G:autoextend
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 32M
innodb_log_file_size = 2G
innodb_log_files_in_group = 3
innodb_max_undo_log_size = 4G
innodb_undo_directory = /data/mysql/mysql_3306/undolog

# Adjust according to your server IOPS capability. # If you use a normal SSD, you can adjust it to 10,000 - 20,000.
# If you configure a high-end PCIe SSD card, you can adjust it higher, such as 50000 - 80000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_sync = 0
innodb_flush_neighbors = 0
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_purge_threads = 4
innodb_page_cleaners = 4
innodb_open_files = 65535
innodb_max_dirty_pages_pct = 50
innodb_flush_method = O_DIRECT
innodb_lru_scan_depth = 4000
innodb_checksum_algorithm = crc32
innodb_lock_wait_timeout = 10
innodb_rollback_on_timeout = 1
innodb_print_all_deadlocks = 1
innodb_file_per_table = 1
innodb_online_alter_log_max_size = 4G
innodb_stats_on_metadata = 0

# some var for MySQL 8
log_error_verbosity = 3
innodb_print_ddl_logs = 1
binlog_expire_logs_seconds = 2592000
#innodb_dedicated_server = 0

innodb_status_file = 1
# Note: Enabling innodb_status_output & innodb_status_output_locks may cause the log-error file to grow faster innodb_status_output = 0
innodb_status_output_locks = 0

#performance_schema
performance_schema = 1
performance_schema_instrument = '%memory%=on'
performance_schema_instrument = '%lock%=on'

#innodb monitor
innodb_monitor_enable="module_innodb"
innodb_monitor_enable="module_server"
innodb_monitor_enable="module_dml"
innodb_monitor_enable="module_ddl"
innodb_monitor_enable="module_trx"
innodb_monitor_enable="module_os"
innodb_monitor_enable="module_purge"
innodb_monitor_enable="module_log"
innodb_monitor_enable="module_lock"
innodb_monitor_enable="module_buffer"
innodb_monitor_enable="module_index"
innodb_monitor_enable="module_ibuf_system"
innodb_monitor_enable="module_buffer_page"
innodb_monitor_enable="module_adaptive_hash"

#MGR
: : : : : : : : : : : : : : :
quick
max_allowed_packet = 32M

[mysqld_safe]
#malloc-lib=/usr/local/mysql/lib/jmalloc.so 
nice=-19
open-files-limit=65535

EOF

# The third station if [ -f /etc/my.cnf ]; then
 mv /etc/my.cnf /etc/my.cnf.`date +%Y%m%d%H%m`.bak
fi 
# node1
cat >/data/mysql/mysql_3306/my_3306.cnf <<"EOF"
[client]
port = 3306
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock

[mysql]
prompt="\u@\h \R:\m:\s [\d]> "
no-auto-rehash

[mysqld]
user = mysql
port = 3306
admin_address = 127.0.0.1
basedir = /usr/local/mysql
datadir = /data/mysql/mysql_3306/data
socket = /data/mysql/mysql_3306/tmp/mysql_3306.sock
pid-file = mysql_3306.pid
character-set-server = utf8mb4
skip_name_resolve = 1

#replicate-wild-ignore-table=mysql.%
#replicate-wild-ignore-table=test.%
#replicate-wild-ignore-table=information_schema.%

# Two-Master configure
#server-1 
#auto-increment-offset = 1
#auto-increment-increment = 2 

#server-2    
#auto-increment-offset = 2
#auto-increment-increment = 2


# semi sync replication settings #
#plugin_dir = /usr/local/mysql/lib/mysql/plugin
#plugin_load = "validate_password.so;rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
plugin_dir = /usr/local/mysql/lib/plugin #Official version path plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #Official version path slave_parallel_workers = 4
slave_parallel_type = LOGICAL_CLOCK
slave_preserve_commit_order = 1

open_files_limit = 65535
back_log = 1024
max_connections = 1024
max_connect_errors = 1000000
table_open_cache = 1024
table_definition_cache = 1024
table_open_cache_instances = 64
thread_stack = 512K
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 1536
interactive_timeout = 600
wait_timeout = 600
tmp_table_size = 32M
max_heap_table_size = 32M
slow_query_log = 1
log_timestamps = SYSTEM
slow_query_log_file = /data/mysql/mysql_3306/logs/slow.log
log-error = /data/mysql/mysql_3306/logs/error.log
long_query_time = 0.1
log_queries_not_using_indexes = 1
log_throttle_queries_not_using_indexes = 60
min_examined_row_limit = 100
log_slow_admin_statements = 1
log_slow_slave_statements = 1
server-id = 1443306
log-bin = /data/mysql/mysql_3306/logs/mysql-bin
sync_binlog = 1
binlog_cache_size = 4M
max_binlog_cache_size = 2G
max_binlog_size = 1G
binlog_expire_logs_seconds=2592000 
master_info_repository = TABLE
relay_log_info_repository = TABLE
gtid_mode = on
enforce_gtid_consistency = 1
binlog_checksum=NONE
log_slave_updates
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'
binlog_format = row
binlog_row_image=FULL

relay_log_recovery = 1
relay-log-purge = 1
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
lock_wait_timeout = 3600
explicit_defaults_for_timestamp = 1
innodb_thread_concurrency = 0
innodb_sync_spin_loops = 100
innodb_spin_wait_delay = 30

#transaction_isolation = REPEATABLE-READ
transaction_isolation = READ-COMMITTED
#innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 2867M
innodb_buffer_pool_instances = 4
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_data_file_path = ibdata1:1G:autoextend
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 32M
innodb_log_file_size = 2G
innodb_log_files_in_group = 3
innodb_max_undo_log_size = 4G
innodb_undo_directory = /data/mysql/mysql_3306/undolog

# Adjust according to your server IOPS capability. # If you use a normal SSD, you can adjust it to 10,000 - 20,000.
# If you configure a high-end PCIe SSD card, you can adjust it higher, such as 50000 - 80000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_sync = 0
innodb_flush_neighbors = 0
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_purge_threads = 4
innodb_page_cleaners = 4
innodb_open_files = 65535
innodb_max_dirty_pages_pct = 50
innodb_flush_method = O_DIRECT
innodb_lru_scan_depth = 4000
innodb_checksum_algorithm = crc32
innodb_lock_wait_timeout = 10
innodb_rollback_on_timeout = 1
innodb_print_all_deadlocks = 1
innodb_file_per_table = 1
innodb_online_alter_log_max_size = 4G
innodb_stats_on_metadata = 0

# some var for MySQL 8
log_error_verbosity = 3
innodb_print_ddl_logs = 1
binlog_expire_logs_seconds = 2592000
#innodb_dedicated_server = 0

innodb_status_file = 1
# Note: Enabling innodb_status_output & innodb_status_output_locks may cause the log-error file to grow faster innodb_status_output = 0
innodb_status_output_locks = 0

#performance_schema
performance_schema = 1
performance_schema_instrument = '%memory%=on'
performance_schema_instrument = '%lock%=on'

#innodb monitor
innodb_monitor_enable="module_innodb"
innodb_monitor_enable="module_server"
innodb_monitor_enable="module_dml"
innodb_monitor_enable="module_ddl"
innodb_monitor_enable="module_trx"
innodb_monitor_enable="module_os"
innodb_monitor_enable="module_purge"
innodb_monitor_enable="module_log"
innodb_monitor_enable="module_lock"
innodb_monitor_enable="module_buffer"
innodb_monitor_enable="module_index"
innodb_monitor_enable="module_ibuf_system"
innodb_monitor_enable="module_buffer_page"
innodb_monitor_enable="module_adaptive_hash"

#MGR
: : : : : : : : : : : : : : :
quick
max_allowed_packet = 32M

[mysqld_safe]
#malloc-lib=/usr/local/mysql/lib/jmalloc.so 
nice=-19
open-files-limit=65535

EOF

chown -R mysql.mysql /data/mysql/mysql_3306
chown -R mysql.mysql /usr/local/mysql/

# Initialize # /usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql --initialize-insecure
# The official recommendation is to use --initialize, which will generate a temporary password that is difficult to enter in the error log. I use the password-free method here.
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my_3306.cnf --initialize-insecure --user=mysql &

#Start the database /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/mysql_3306/my_3306.cnf &

#9. Check the log# tail -f /data/mysql/mysql_3306/logs/error.log

#10. First login /usr/local/mysql/bin/mysql -S /data/mysql/mysql_3306/tmp/mysql_3306.sock

# Change password method set sql_log_bin = 0;

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'GJjumB6g4FcwdF3R6AZc' PASSWORD EXPIRE NEVER;
create user 'root'@'127.0.0.1' identified WITH mysql_native_password by 'GJjumB6g4FcwdF3R6AZc' PASSWORD EXPIRE NEVER;
grant all privileges on *.* to 'root'@'127.0.0.1' with grant option;

create user 'admin_m'@'127.0.0.1' identified WITH mysql_native_password by 'fcfmTbRw1tz2x5L5GvjJ' PASSWORD EXPIRE NEVER; 
grant all privileges on *.* to 'admin_m'@'127.0.0.1' with grant option;

create user 'admin_m'@'%' identified WITH mysql_native_password by 'fcfmTbRw1tz2x5L5GvjJ' PASSWORD EXPIRE NEVER; 
grant all privileges on *.* to 'admin_m'@'%' with grant option;

create user 'test_w'@'%' identified with mysql_native_password by 'EeCrfUDO6wRzn72BBQ52' PASSWORD EXPIRE NEVER;
grant insert,delete,update,select on db144.* to 'test_w'@'%';

create user 'test_r'@'%' identified with mysql_native_password by 'EeCrfUDO6wRzn72BBQ52' PASSWORD EXPIRE NEVER;
grant insert,delete,update,select on db144.* to 'test_r'@'%';

create user 'repl'@'%' IDENTIFIED with mysql_native_password by 'replpfhOTnWffQdQL3F3';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
set sql_log_bin = 1;

ln -s /usr/local/mysql/lib/libmysqlclient.so /usr/lib/
ln -s /usr/local/mysql/lib/libmysqlclient.so.21 /usr/lib/libmysqlclient.so.21
ln -s /usr/local/mysql/lib/libmysqlclient.so /usr/lib64/
ln -s /usr/local/mysql/lib/libmysqlclient.so.21 /usr/lib64/libmysqlclient.so.21


ln -s /data/mysql/mysql_3306/tmp/mysql_3306.sock /tmp/mysql.sock
ln -s /usr/local/mysql/bin/* /usr/bin/

cat >>~/.bashrc <<"EOF"
##########


alias mysql.3306.start="/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/mysql_3306/my_3306.cnf &"
alias mysql.3306.stop="/usr/local/mysql/bin/mysqladmin -h127.0.0.1 -P 3306 -uroot -p'GJjumB6g4FcwdF3R6AZc' shutdown &"
alias mysql.3306.login="/usr/local/mysql/bin/mysql -h127.0.0.1 -P 3306 -uroot -p'GJjumB6g4FcwdF3R6AZc'"


##########
EOF


source /root/.bash_profile

cat >>/etc/ld.so.conf <<"EOF"
/usr/local/mysql/lib
EOF

ldconfig 
mysql.3306.login

# MGR first machine configuration:
# Step 1: Create a user for replication set sql_log_bin=0;
create user 'repuser'@'%' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'%';

create user 'repuser'@'127.0.0.1' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'127.0.0.1';

create user 'repuser'@'localhost' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'localhost';

set sql_log_bin=1;

# Step 2: Configure the user used for replication change master to master_user='repuser',master_password='JhXpMK44ju8Vp5bxvO2N' for channel 'group_replication_recovery';

# Step 3: Install the mysql group replication plugin # Note: If you write plugin_load="group_replication=group_replication.so" in my.cnf, you don't need to install plugin group_replication soname 'group_replication.so';

# Check whether the installation is successful by show plugins;show plugins;

# Step 4: Create a group (the official term is to initialize a replication group set global group_replication_bootstrap_group=on;
start group_replication;
set global group_replication_bootstrap_group=off;

select * from performance_schema.replication_group_members;

##########################################################################
#MGR configures other slave nodes #Execute in mysql on all slave hosts # Step 1: Create a user for replication set sql_log_bin=0;
create user 'repuser'@'%' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'%';

create user 'repuser'@'127.0.0.1' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'127.0.0.1';

create user 'repuser'@'localhost' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,replication client on *.* to 'repuser'@'localhost';

set sql_log_bin=1;

# Step 2: Configure the user used for replication change master to master_user='repuser',master_password='JhXpMK44ju8Vp5bxvO2N' for channel 'group_replication_recovery';

# Step 3: Install the mysql group replication plugin # Note: If you write plugin_load="group_replication=group_replication.so" in my.cnf, you don't need to install plugin group_replication soname 'group_replication.so';

# Check whether the installation is successful by show plugins;show plugins;

# Step 4: Join the replication group created earlier start group_replication;
select * from performance_schema.replication_group_members;
#########################################################################################

# Check statusmysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | d955da6d-0048-11ea-b7b4-525400f4342d | bj-db-m1 | 3306 | ONLINE | PRIMARY | 8.0.18 |
| group_replication_applier | e050c34f-0048-11ea-917d-52540021fab9 | bj-db-m3 | 3306 | ONLINE | SECONDARY | 8.0.18 |
| group_replication_applier | e6c56347-0048-11ea-9e8b-5254007c241f | bj-db-m2 | 3306 | ONLINE | SECONDARY | 8.0.18 |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
3 rows in set (0.00 sec)

######################################################################
# Switching from single master to multi-master # MGR switching mode requires restarting group replication, so you need to shut down group replication on all nodes first.
#Set group_replication_single_primary_mode=OFF and other parameters, and then start group replication.
1) Stop group replication (executed on all MGR nodes):
stop group_replication; 
set global group_replication_single_primary_mode=OFF;
set global group_replication_enforce_update_everywhere_checks=ON;

2) Select any MGR node to execute (for example, select MGR-node1 here):
set global group_replication_recovery_get_public_key=1;
SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;

3) Then execute on other MGR nodes (here it refers to MGR-node2 and MGR-node3):
set global group_replication_recovery_get_public_key=1;
START GROUP_REPLICATION;

4) View MGR group information (can be viewed on any MGR node)
SELECT * FROM performance_schema.replication_group_members;


# You can see that the status of all MGR nodes is online, the role is PRIMARY, and the MGR multi-master mode is successfully established.

##########################################################################
# Switch back from multi-master mode to single-master mode 1) Stop group replication (execute on all MGR nodes):
stop group_replication;
set global group_replication_enforce_update_everywhere_checks=OFF;
set global group_replication_single_primary_mode=ON;

2) Select a node as the master node and execute it on the master node (here MGR-node1 is selected as the master node)
SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;
 
3) Execute on the remaining nodes, that is, the slave nodes (the slave nodes here refer to MGR-node2 and MGR-node3):
START GROUP_REPLICATION;

4) View MGR group information (can be viewed on any MGR node)
SELECT * FROM performance_schema.replication_group_members;
##########################################################################

# Fault precautions:
# In single-master mode, restore the MGR-node1 node. After recovery, you need to manually activate the group replication function of the node. # If a node fails, it needs to rejoin the MGR cluster after recovery. The correct way is:
STOP GROUP_REPLICATION;
START GROUP_REPLICATION;

# If a node hangs, other nodes continue to synchronize.
# When the failed node is restored, you only need to manually activate the group replication function of the node ("START GROUP_REPLICATION;"),
# You can join the MGR group replication cluster normally and automatically synchronize data from other nodes.


# If an exception occurs in i/o replication # After confirming that the data is correct # Find the gtid of the master database mysql> show global variables like '%gtid%';
+----------------------------------------------+------------------------------------------------------+
| Variable_name | Value |
+----------------------------------------------+------------------------------------------------------+
| binlog_gtid_simple_recovery | ON |
| enforce_gtid_consistency | ON |
| group_replication_gtid_assignment_block_size | 1000000 |
| gtid_executed | 58f6e65e-9309-11e9-9d88-525400184a0a:1-946050:1000003 |
| gtid_executed_compression_period | 1000 |
| gtid_mode | ON |
| gtid_owned | |
| gtid_purged | |
| session_track_gtids | OFF |
+----------------------------------------------+------------------------------------------------------+
rows in set (0.00 sec)

# Stop GROUP_REPLICATION in the faulty slave;
reset master;
set global gtid_purged='58f6e65e-9309-11e9-9d88-525400184a0a:1-946055:1000003';
START GROUP_REPLICATION;

# Add whitelist network segment stop group_replication;
set global group_replication_ip_whitelist="127.0.0.1/32,172.16.60.0/24,172.16.50.0/24,172.16.51.0/24";
start group_replication;
show variables like "group_replication_ip_whitelist";

# Please note: Before configuring the whitelist, you must first disable Group Replication and execute "stop group_replication;"