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这篇文章将为大家详细讲解有关 mysql 8.0.18 mgr 搭建及其切换功能的案例，丸趣 TV 小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
一、系统安装包
yum -y install make gcc-c++ cmake bison-devel ncurses-devel readline-devel libaio-devel perl libaio wget lrzsz vim libnuma* bzip2 xz二、关闭防火墙和 selinux
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三、修改系统限制参数
cat /etc/security/limits.conf EOF
###custom
* soft nofile 20480
* hard nofile 65535
* soft nproc 20480
* hard nproc 65535
EOF四、配置每台 hosts 主机解析
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五、修改内核参数
cat /etc/sysctl.conf EOF
vm.swappiness=0
#增加 tcp 支持的队列数
net.ipv4.tcp_max_syn_backlog = 65535
#减少断开连接时 ，资源回收
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
#改变本地的端口范围
net.ipv4.ip_local_port_range = 1024 65535
#允许更多的连接进入队列
net.ipv4.tcp_max_syn_backlog = 4096
#对于只在本地使用的数据库服务器
net.ipv4.tcp_fin_timeout = 30
#端口监听队列
net.core.somaxconn=65535
#接受数据的速率
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
sysctl -p六、下载安装包
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# 解压安装包
tar -xJf mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# 进入目录，做软连接，方便以后升级
cd /usr/local/
ln -s /opt/mysql-8.0.18-linux-glibc2.12-x86_64 mysql
# 创建用户
groupadd mysql
useradd -g mysql mysql -d /home/mysql -s /sbin/nologin
# 创建相应的目录
mkdir -p /data/mysql/mysql_3306/{logs,tmp,undolog}七、创建 my.cnf 配置文件
7-1、第一台配置
# 第一台
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 # 官方版本的路径
plugin_load = rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so # 官方版本的路径
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
# 根据您的服务器 IOPS 能力适当调整
# 一般配普通 SSD 盘的话，可以调整到 10000 - 20000
# 配置高端 PCIe SSD 卡的话，则可以调整的更高，比如 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
# 注意: 开启 innodb_status_output innodb_status_output_locks 后, 可能会导致 log-error 文件增长较快
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
#GR 配置项 基中 loose 前缀表示若 group Replication plugin 未加载 mysql server 仍明治维新启动
transaction_write_set_extraction = XXHASH64 # 对每个事务获取 write set，并且用 XXHASH64 算法获取 hash 值
loose-group_replication_group_name = 58f6e65e-9309-11e9-9d88-525400184a0a # 组名，此处可拿 select uuid() 生成
loose-group_replication_start_on_boot = off # 在 mysqld 启动时不自动启动组复制
loose-group_replication_local_address = 10.10.146.28:33006 # 本节点的 IP 地址和端口，注意该端口是组内成员之间通信的端口，而不是 MySQL 对外提供服务的端口
loose-group_replication_group_seeds = 10.10.146.28:33006,10.10.1.139:33006,10.10.173.84:33006 # 种子节点的 IP 和端口号，新成员加入到集群的时候需要联系种子节点，启动集群的节点不使用该选项
loose-group_replication_bootstrap_group = off #关闭，如果打开会造成脑裂 # 是否启动集群，注意，该选项任何时候只能用于一个节点，通常情况下启动集群的时候使用，启动之后需要关闭该选项
loose-group_replication_member_weight = 50 # 权重选择
EOF7-2、第二台配置
# 第二台
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 # 官方版本的路径
plugin_load = rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so # 官方版本的路径
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
# 根据您的服务器 IOPS 能力适当调整
# 一般配普通 SSD 盘的话，可以调整到 10000 - 20000
# 配置高端 PCIe SSD 卡的话，则可以调整的更高，比如 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
# 注意: 开启 innodb_status_output innodb_status_output_locks 后, 可能会导致 log-error 文件增长较快
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
#GR 配置项 基中 loose 前缀表示若 group Replication plugin 未加载 mysql server 仍明治维新启动
transaction_write_set_extraction = XXHASH64 # 对每个事务获取 write set，并且用 XXHASH64 算法获取 hash 值
loose-group_replication_group_name = 58f6e65e-9309-11e9-9d88-525400184a0a # 组名，此处可拿 select uuid() 生成
loose-group_replication_start_on_boot = off # 在 mysqld 启动时不自动启动组复制
loose-group_replication_local_address = 10.10.1.139:33006 # 本节点的 IP 地址和端口，注意该端口是组内成员之间通信的端口，而不是 MySQL 对外提供服务的端口
loose-group_replication_group_seeds = 10.10.146.28:33006,10.10.1.139:33006,10.10.173.84:33006 # 种子节点的 IP 和端口号，新成员加入到集群的时候需要联系种子节点，启动集群的节点不使用该选项
loose-group_replication_bootstrap_group = off #关闭，如果打开会造成脑裂 # 是否启动集群，注意，该选项任何时候只能用于一个节点，通常情况下启动集群的时候使用，启动之后需要关闭该选项
loose-group_replication_member_weight = 50 # 权重选择
EOF7-3、第三台配置
# 第三台
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 # 官方版本的路径
plugin_load = rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so # 官方版本的路径
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
# 根据您的服务器 IOPS 能力适当调整
# 一般配普通 SSD 盘的话，可以调整到 10000 - 20000
# 配置高端 PCIe SSD 卡的话，则可以调整的更高，比如 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
# 注意: 开启 innodb_status_output innodb_status_output_locks 后, 可能会导致 log-error 文件增长较快
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
#GR 配置项 基中 loose 前缀表示若 group Replication plugin 未加载 mysql server 仍明治维新启动
transaction_write_set_extraction = XXHASH64 # 对每个事务获取 write set，并且用 XXHASH64 算法获取 hash 值
loose-group_replication_group_name = 58f6e65e-9309-11e9-9d88-525400184a0a # 组名，此处可拿 select uuid() 生成
loose-group_replication_start_on_boot = off # 在 mysqld 启动时不自动启动组复制
loose-group_replication_local_address = 10.10.173.84:33006 # 本节点的 IP 地址和端口，注意该端口是组内成员之间通信的端口，而不是 MySQL 对外提供服务的端口
loose-group_replication_group_seeds = 10.10.146.28:33006,10.10.1.139:33006,10.10.173.84:33006 # 种子节点的 IP 和端口号，新成员加入到集群的时候需要联系种子节点，启动集群的节点不使用该选项
loose-group_replication_bootstrap_group = off #关闭，如果打开会造成脑裂 # 是否启动集群，注意，该选项任何时候只能用于一个节点，通常情况下启动集群的时候使用，启动之后需要关闭该选项
loose-group_replication_member_weight = 50 # 权重选择
EOF八、修改权限、初始化并启动
chown -R mysql.mysql /data/mysql/mysql_3306
chown -R mysql.mysql /usr/local/mysql/
# /usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql --initialize-insecure
# 官方推荐使用 --initialize，会在错误日志中生成难以输入的临时密码，我这里使用的免密码的方式。/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my_3306.cnf --initialize-insecure --user=mysql
#启动数据库
/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/mysql_3306/my_3306.cnf 九、查看日志
#9、查看日志
# tail -f /data/mysql/mysql_3306/logs/error.log十、初次登陆
#10、初次登陆
/usr/local/mysql/bin/mysql -S /data/mysql/mysql_3306/tmp/mysql_3306.sock十一、修改密码
# 修改密码方法
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;十二、快捷方式设置
快捷方式
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 -h227.0.0.1 -P 3306 -uroot -p GJjumB6g4FcwdF3R6AZc shutdown
alias mysql.3306.login= /usr/local/mysql/bin/mysql -h227.0.0.1 -P 3306 -uroot -p GJjumB6g4FcwdF3R6AZc
ldconfig
mysql.3306.login十三、MGR 配置
13-1、第一台配置
# MGR 第一台配置：# 第一步：创建用于复制的用户
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;
# 第二步：配置复制所使用的用户
change master to master_user= repuser ,master_password= JhXpMK44ju8Vp5bxvO2N for channel group_replication_recovery
# 第三步：安装 mysql group replication 这个插件
# 备注：如果在 my.cnf 里写写入 plugin_load= group_replication=group_replication.so 这步就可以不用操作
install plugin group_replication soname group_replication.so
# 通过 show plugins; 查看是否安装成功
show plugins;
# 第四步：建个群 ( 官方点的说法就是初始化一个复制组
set global group_replication_bootstrap_group=on;
start group_replication;
set global group_replication_bootstrap_group=off;
select * from performance_schema.replication_group_members;13-2、第二台、第三台配置
##########################################################################
#MGR 配置其他从节点
#在所有从主机上的 mysql 中执行
# 第一步：创建用于复制的用户
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;
# 第二步：配置复制所使用的用户
change master to master_user= repuser ,master_password= JhXpMK44ju8Vp5bxvO2N for channel group_replication_recovery
# 第三步：安装 mysql group replication 这个插件
# 备注：如果在 my.cnf 里写写入 plugin_load= group_replication=group_replication.so 这步就可以不用操作
install plugin group_replication soname group_replication.so
# 通过 show plugins; 查看是否安装成功
show plugins;
# 第四步：加入前面创建好的复制组
start group_replication;
select * from performance_schema.replication_group_members;
#########################################################################################
# 检查状态
mysql 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)十四、单主切换到多主
######################################################################
# 单主切换到多主
# MGR 切换模式需要重新启动组复制，因此需要在所有节点上先关闭组复制，#设置 group_replication_single_primary_mode=OFF 等参数，再启动组复制。1) 停止组复制 (在所有 MGR 节点上执行)：stop group_replication;
set global group_replication_single_primary_mode=OFF;
set global group_replication_enforce_update_everywhere_checks=ON;
2) 随便选择某个 MGR 节点执行 (比如这里选择在 MGR-node1 节点):
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) 然后在其他的 MGR 节点执行 (这里指 MGR-node2 和 MGR-node3 节点上执行):
set global group_replication_recovery_get_public_key=1;
START GROUP_REPLICATION;
4) 查看 MGR 组信息 (在任意一个 MGR 节点上都可以查看)
SELECT * FROM performance_schema.replication_group_members;
# 可以看到所有 MGR 节点状态都是 online，角色都是 PRIMARY，MGR 多主模式搭建成功。##########################################################################
十五、多主切换回单主
##########################################################################
# 多主切回单主模式
1) 停止组复制 (在所有 MGR 节点上执行)：stop group_replication;
set global group_replication_enforce_update_everywhere_checks=OFF;
set global group_replication_single_primary_mode=ON;
2) 选择一个节点作为主节点, 在主节点上执行 (这里选择 MGR-node1 节点作为主节点)
SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;
3) 在其他剩余的节点, 也就是从库节点上执行 (这里从库节点指的就是 MGR-node2 和 MGR-node3):
START GROUP_REPLICATION;
4) 查看 MGR 组信息 (在任意一个 MGR 节点上都可以查看)
SELECT * FROM performance_schema.replication_group_members;
##########################################################################十六、故障注意事项
# 故障注意点：# 单主模式，恢复 MGR-node1 节点, 恢复后, 需要手动激活下该节点的组复制功能
# 如果节点发生故障, 在恢复后需要重新加入到 MGR 集群里, 正确的做法是:
STOP GROUP_REPLICATION;
START GROUP_REPLICATION;
# 如果某个节点挂了, 则其他的节点继续进行同步.
# 当故障节点恢复后, 只需要手动激活下该节点的组复制功能 (START GROUP_REPLICATION;),
# 即可正常加入到 MGR 组复制集群内并自动同步其他节点数据.
# 查找主库的 gtid 情况
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)
# 在有故障的从库中操作
stop GROUP_REPLICATION;
reset master;
set global gtid_purged= 58f6e65e-9309-11e9-9d88-525400184a0a:1-946055:1000003
START GROUP_REPLICATION;
# 添加白名单网段
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
# 一定要注意: 配置白名单前面一定要先关闭 Group Replication, 及先要执行 stop group_replication;关于“mysql 8.0.18 mgr 搭建及其切换功能的案例”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，使各位可以学到更多知识，如果觉得文章不错，请把它分享出去让更多的人看到。
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