2. 程式人生 > 資料庫 >mysql 8.0.18 mgr 搭建及其切換功能

mysql 8.0.18 mgr 搭建及其切換功能

阿新 • • 發佈：2020-01-09

一、系統安裝包

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

二、關閉防火牆和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、修改系統限制引數

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

四、配置每臺hosts主機解析

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、修改核心引數

cat >>/etc/sysctl.conf <<"EOF"
vm.swappiness=0
#增加tcp支援的佇列數
net.ipv4.tcp_max_syn_backlog = 65535
#減少斷開連線時 ，資源回收
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
#改變本地的埠範圍
net.ipv4.ip_local_port_range = 1024 65535
#允許更多的連線進入佇列
net.ipv4.tcp_max_syn_backlog = 4096 
#對於只在本地使用的資料庫伺服器
net.ipv4.tcp_fin_timeout = 30
#埠監聽佇列
net.core.somaxconn=65535
#接受資料的速率
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、下載安裝包

wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# 解壓安裝包
tar -xJf mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz
# 進入目錄，做軟連線，方便以後升級
cd /usr/local/
ln -s /opt/mysql-8.0.18-linux-glibc2.12-x86_64 mysql
# 建立使用者
groupadd mysql
useradd -g mysql mysql -d /home/mysql -s /sbin/nologin

# 建立相應的目錄

mkdir -p /data/mysql/mysql_3306/{logs,tmp,undolog}

七、建立my.cnf配置檔案

7-1、第一臺配置

# 第一臺
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 #官方版本的路徑
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #官方版本的路徑

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

# 根據您的伺服器IOPS能力適當調整
# 一般配普通SSD盤的話，可以調整到 10000 - 20000
# 配置高階PCIe SSD卡的話，則可以調整的更高，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: 開啟 innodb_status_output & innodb_status_output_locks 後,可能會導致log-error檔案增長較快
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配置項 基中loose字首表示若group Replication plugin未載入 mysql server仍明治維新啟動
transaction_write_set_extraction = XXHASH64 #對每個事務獲取write set，並且用XXHASH64演算法獲取hash值
loose-group_replication_group_name = "58f6e65e-9309-11e9-9d88-525400184a0a" #組名，此處可拿select uuid()生成
loose-group_replication_start_on_boot = off #在mysqld啟動時不自動啟動組複製
loose-group_replication_local_address = "10.10.146.28:33006" #本節點的IP地址和埠，注意該埠是組內成員之間通訊的埠，而不是MySQL對外提供服務的埠
loose-group_replication_group_seeds = "10.10.146.28:33006,10.10.1.139:33006,10.10.173.84:33006" #種子節點的IP和埠號，新成員加入到叢集的時候需要聯絡種子節點，啟動叢集的節點不使用該選項
loose-group_replication_bootstrap_group = off #關閉，如果開啟會造成腦裂 #是否啟動叢集，注意，該選項任何時候只能用於一個節點，通常情況下啟動叢集的時候使用，啟動之後需要關閉該選項

loose-group_replication_member_weight = 50 #權重選擇


[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、第二臺配置

# 第二臺
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 #官方版本的路徑
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #官方版本的路徑

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,可能會導致log-error檔案增長較快
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配置項 基中loose字首表示若group Replication plugin未載入 mysql server仍明治維新啟動
transaction_write_set_extraction = XXHASH64 #對每個事務獲取write set，並且用XXHASH64演算法獲取hash值
loose-group_replication_group_name = "58f6e65e-9309-11e9-9d88-525400184a0a" #組名，此處可拿select uuid()生成
loose-group_replication_start_on_boot = off #在mysqld啟動時不自動啟動組複製
loose-group_replication_local_address = "10.10.1.139:33006" #本節點的IP地址和埠，注意該埠是組內成員之間通訊的埠，而不是MySQL對外提供服務的埠
loose-group_replication_group_seeds = "10.10.146.28:33006,10.10.173.84:33006" #種子節點的IP和埠號，新成員加入到叢集的時候需要聯絡種子節點，啟動叢集的節點不使用該選項
loose-group_replication_bootstrap_group = off #關閉，如果開啟會造成腦裂 #是否啟動叢集，注意，該選項任何時候只能用於一個節點，通常情況下啟動叢集的時候使用，啟動之後需要關閉該選項

loose-group_replication_member_weight = 50 #權重選擇


[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、第三臺配置

# 第三臺
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 #官方版本的路徑
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" #官方版本的路徑

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,可能會導致log-error檔案增長較快
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配置項 基中loose字首表示若group Replication plugin未載入 mysql server仍明治維新啟動
transaction_write_set_extraction = XXHASH64 #對每個事務獲取write set，並且用XXHASH64演算法獲取hash值
loose-group_replication_group_name = "58f6e65e-9309-11e9-9d88-525400184a0a" #組名，此處可拿select uuid()生成
loose-group_replication_start_on_boot = off #在mysqld啟動時不自動啟動組複製
loose-group_replication_local_address = "10.10.173.84:33006" #本節點的IP地址和埠，注意該埠是組內成員之間通訊的埠，而不是MySQL對外提供服務的埠
loose-group_replication_group_seeds = "10.10.146.28:33006,10.10.173.84:33006" #種子節點的IP和埠號，新成員加入到叢集的時候需要聯絡種子節點，啟動叢集的節點不使用該選項
loose-group_replication_bootstrap_group = off #關閉，如果開啟會造成腦裂 #是否啟動叢集，注意，該選項任何時候只能用於一個節點，通常情況下啟動叢集的時候使用，啟動之後需要關閉該選項

loose-group_replication_member_weight = 50 #權重選擇


[mysqldump]
quick
max_allowed_packet = 32M

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

EOF

八、修改許可權、初始化並啟動

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
# 官方推薦使用--initialize，會在錯誤日誌中生成難以輸入的臨時密碼，我這裡使用的免密碼的方式。
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my_3306.cnf --initialize-insecure --user=mysql &

#啟動資料庫
/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/mysql_3306/my_3306.cnf &

九、檢視日誌

#9、檢視日誌
# tail -f /data/mysql/mysql_3306/logs/error.log

十、初次登陸

#10、初次登陸
/usr/local/mysql/bin/mysql -S /data/mysql/mysql_3306/tmp/mysql_3306.sock

十一、修改密碼

# 修改密碼方法

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,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、快捷方式設定

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、第一臺配置

# MGR 第一臺配置：
# 第一步：建立用於複製的使用者

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：配置複製所使用的使用者

change master to master_user='repuser',master_password='JhXpMK44ju8Vp5bxvO2N' for channel 'group_replication_recovery';

# 第三步：安裝mysql group replication這個外掛


# 備註：如果在my.cnf裡寫寫入 plugin_load="group_replication=group_replication.so" 這步就可以不用操作

install plugin group_replication soname 'group_replication.so';

# 通過show plugins;檢視是否安裝成功
show plugins;

# 第四步：建個群(官方點的說法就是初始化一個複製組

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、第二臺、第三臺配置

##########################################################################
#MGR 配置其他從節點
#在所有從主機上的mysql中執行
# 第一步：建立用於複製的使用者

set sql_log_bin=0;
create user 'repuser'@'%' identified by 'JhXpMK44ju8Vp5bxvO2N';

grant replication slave,master_password='JhXpMK44ju8Vp5bxvO2N' for channel 'group_replication_recovery';

# 第三步：安裝mysql group replication這個外掛


# 備註：如果在my.cnf裡寫寫入 plugin_load="group_replication=group_replication.so" 這步就可以不用操作

install plugin group_replication soname 'group_replication.so';

# 通過show plugins;檢視是否安裝成功
show plugins;

# 第四步：加入前面建立好的複製組

start group_replication;
select * from performance_schema.replication_group_members;
#########################################################################################

# 檢查狀態
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、單主切換到多主

######################################################################
# 單主切換到多主
# MGR切換模式需要重新啟動組複製，因此需要在所有節點上先關閉組複製，
#設定 group_replication_single_primary_mode=OFF 等引數，再啟動組複製。
1) 停止組複製(在所有MGR節點上執行)：
stop group_replication; 
set global group_replication_single_primary_mode=OFF;
set global group_replication_enforce_update_everywhere_checks=ON;

2) 隨便選擇某個MGR節點執行 (比如這裡選擇在MGR-node1節點):
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) 然後在其他的MGR節點執行 (這裡指MGR-node2和MGR-node3節點上執行):
set global group_replication_recovery_get_public_key=1;
START GROUP_REPLICATION;

4) 檢視MGR組資訊 (在任意一個MGR節點上都可以檢視)
SELECT * FROM performance_schema.replication_group_members;


# 可以看到所有MGR節點狀態都是online，角色都是PRIMARY，MGR多主模式搭建成功。

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

十五、多主切換回單主

##########################################################################
# 多主切回單主模式
1) 停止組複製(在所有MGR節點上執行)：
stop group_replication;
set global group_replication_enforce_update_everywhere_checks=OFF;
set global group_replication_single_primary_mode=ON;

2) 選擇一個節點作為主節點,在主節點上執行 (這裡選擇MGR-node1節點作為主節點)
SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;
 
3) 在其他剩餘的節點,也就是從庫節點上執行 (這裡從庫節點指的就是MGR-node2和MGR-node3):
START GROUP_REPLICATION;

4) 檢視MGR組資訊 (在任意一個MGR節點上都可以檢視)
SELECT * FROM performance_schema.replication_group_members;
##########################################################################

十六、故障注意事項

# 故障注意點：
# 單主模式，恢復MGR-node1節點,恢復後,需要手動啟用下該節點的組複製功能
# 如果節點發生故障,在恢復後需要重新加入到MGR叢集裡,正確的做法是:
STOP GROUP_REPLICATION;
START GROUP_REPLICATION;

# 如果某個節點掛了,則其他的節點繼續進行同步.
# 當故障節點恢復後,只需要手動啟用下該節點的組複製功能("START GROUP_REPLICATION;"),# 即可正常加入到MGR組複製叢集內並自動同步其他節點資料.


# 如果是i/o複製出現異常
# 確定資料無誤後
# 查詢主庫的gtid情況
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)

# 在有故障的從庫中操作
stop GROUP_REPLICATION;
reset master;
set global gtid_purged='58f6e65e-9309-11e9-9d88-525400184a0a:1-946055:1000003';
START GROUP_REPLICATION;

# 新增白名單網段
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: 配置白名單前面一定要先關閉 Group Replication,及先要執行"stop group_replication;"

總結

以上所述是小編給大家介紹的mysql 8.0.18 mgr 搭建及其切換功能，希望對大家有所幫助！

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