mysql 8.0.18 mgr 搭建及其切换功能- Starterknow

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

#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

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

# 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’

#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

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

#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

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

# 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’

#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 SLАVE 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;

#########################################################################################

######################################################################

# 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.

# 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！

原创文章，作者：starterknow，如若转载，请注明出处：https://www.starterknow.com/116079.html

mysql 8.0.18 mgr 搭建及其切换功能

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