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    mysql 8.0.18 mgr 搭建及其切换功能

    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
    EOF
    
    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"
    
    #MGR
    #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
    
    
    [mysqldump]
    quick
    max_allowed_packet = 32M
    
    [mysqld_safe]
    #malloc-lib=/usr/local/mysql/lib/jmalloc.so 
    nice=-19
    open-files-limit=65535
    
    EOF


    7-2、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"
    
    #MGR
    #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
    
    
    [mysqldump]
    quick
    max_allowed_packet = 32M
    
    [mysqld_safe]
    #malloc-lib=/usr/local/mysql/lib/jmalloc.so 
    nice=-19
    open-files-limit=65535
    
    EOF

    7-3、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"
    
    #MGR
    #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
    
    
    [mysqldump]
    quick
    max_allowed_packet = 32M
    
    [mysqld_safe]
    #malloc-lib=/usr/local/mysql/lib/jmalloc.so 
    nice=-19
    open-files-limit=65535
    
    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/
    
    #初始化
    # /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 -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
    

    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.
    
    
    # 如果是i/o复制出现异常
    # 确定数据无误后
    # 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;"

    总结

    以上所述是小编给大家介绍的mysql 8.0.18 mgr 搭建及其切换功能,希望对大家有所帮助!

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