006：多實例安裝

時間 2019-11-10

標籤實例安裝简体版

原文原文鏈接

一. 多實例安裝（能夠同版本或異版本）

1. 多實例介紹

一臺服務器上安裝多個MySQL數據庫實例
能夠充分利用服務器的硬件資源（注意io資源）
經過mysqld_multi進行管理

2. 配置文件要點

[mysqld_multi] 是否須要配置html
- my.cnf上直接配置[mysqld1]、[mysqld2]、[mysqld3] 實例標籤，而不配置[mysqld_multi],使用mysqld_multi start 1也是能夠啓動數據庫實例的，可是沒有mysqld_safe的守護進程。因此該標籤須要配置python
- 若是在[client]和[mysqld_multi]標籤中同時存在user和password, 則在關閉數據庫實例中會使用[mysqld_multi]中的user去關閉。mysql
(存在精確匹配的標籤，則優先使用精確匹配標籤下的配置項)linux
multi_admin用戶的做用
經過官方文檔中咱們看到，'multi_admin'@'localhost'這個用戶主要的做用是用來關閉數據庫實例，由於文檔中只受權了SHUTDOWN權限。因此在[mysqld_multi]標籤下，咱們須要配置user和password來進行關閉數據庫實例。可是實際上有bug，還不如用（mysqld_multi --user=root --password=iforgot stop 1）受權有足夠權限，這個權限還在摸索中，哪位有驗證提供一下，謝謝！c++

3. 環境說明

mysqld1 -- MySQL 5.7.18
mysqld2 -- MySQL 5.7.18
mysqld3 -- MySQL 5.6.36

4. 配置說明

MySQL實例1
- mysqld1 (MySQL 5.7.18)
- port = 33016
- datadir = /r2/mysqldata/mysql_33016
- socket = /r2/mysqldata/mysql_33016/mysql.sock
MySQL實例2
- mysqld2 (MySQL 5.7.18)
- port = 33026
- datadir = /r2/mysqldata/mysql_33026
- socket = /r2/mysqldata/mysql_33026/mysql.sock
MySQL實例3
- mysqld3 (MySQL 5.6.36)
- port = 33036
- datadir = /r2/mysqldata/mysql_33036
- socket = /r2/mysqldata/mysql_33036/mysql.sock

這三個參數必須定製且必須不一樣 (port / datadir / socket)sql

server-id和多數據庫實例沒有關係，和數據庫複製有關係。

注意MySQL5.6.36的plugin_dir的路徑數據庫

配置說明：bash
- 1：配置的標籤順序沒有關係，不會影響最終配置的有效性。
- 2：同類型標籤中的配置項會合並，造成一個大的配置項
- 3：匹配度高的標籤中的配置項的值，會覆蓋掉匹配度低的標籤中的配置項的值

[mysqldN]中的配置項會和[mysqld]中的配置項進行合併，而且[mysqldN]中已有的配置項的值，會覆蓋掉[mysqld]中的配置項的值,如datadir, port等服務器

配置文件

#==========================================================
# 多實例配置文件
#==========================================================

[client]            # 這個標籤若是配置了用戶和密碼，
                    # 而且[mysqld_multi]下沒有配置用戶名密碼，
                    # 則mysqld_multi stop時, 會使用這個密碼
                    # 若是沒有精確的匹配，則匹配[client]標籤
user = root
password = iforgot

[mysqld_multi]
mysqld =/usr/local/mysql/bin/mysqld_safe
mysqladmin =/usr/local/mysql/bin/mysqladmin
log = /usr/local/mysql/mysqld_multi.log
user = multi_admin
pass = 123456  
            # 官方文檔中寫的password，可是存在bug，須要改爲pass(v5.7.18)
            # 寫成password，start時正常，stop時，報以下錯誤
            # Access denied for user 'multi_admin'@'localhost' (using password: YES)

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

[mysqld1]   # mysqld後面的數字爲GNR, 是該實例的標識（mysqld_multi start 1）
server-id                       = 33016
mysqld                          = mysqld
mysqladmin                      = mysqladmin
group_concat_max_len            = 102400
user                            = mysql
port                            = 33016
socket                          = /r2/mysqldata/mysql_33016/mysql.sock
basedir                         = /usr/local/mysql
datadir                         = /r2/mysqldata/mysql_33016/data
pid_file                        = /r2/mysqldata/mysql_33016/data/mysql.pid
log_error                       = /r2/mysqldata/mysql_33016/logs/mysql_error.log
log_bin                         = /r2/mysqldata/mysql_33016/logs/binlog
slow_query_log_file             = /r2/mysqldata/mysql_33016/logs/slow.log
log_timestamps                  = system
################################################################
################################################################
[mysqld2]
server-id                       = 33026
mysqld                          = mysqld
mysqladmin                      = mysqladmin
user                            = mysql
port                            = 33026
socket                          = /r2/mysqldata/mysql_33026/mysql.sock
basedir                         = /usr/local/mysql
datadir                         = /r2/mysqldata/mysql_33026/data/
pid_file                        = /r2/mysqldata/mysql_33026/data/mysql.pid
log_error                       = /r2/mysqldata/mysql_33026/logs/mysql_error.log
log_bin                         = /r2/mysqldata/mysql_33026/logs/binlog
slow_query_log_file             = /r2/mysqldata/mysql_33026/logs/slow.log
log_timestamps                  = system

################################################################
################################################################
[mysqld3]
server-id                       = 33036
mysqld                          = /usr/local/mysql56/bin/mysqld
mysqladmin                      = /usr/local/mysql56/bin/mysqladmin
user                            = mysql
port                            = 33036
socket                          = /r2/mysqldata/mysql_33036/mysql.sock
basedir                         = /usr/local/mysql56
datadir                         = /r2/mysqldata/mysql_33036/data
pid_file                        = /r2/mysqldata/mysql_33036/data/mysql.pid
log_error                       = /r2/mysqldata/mysql_33036/logs/mysql_error.log
log_bin                         = /r2/mysqldata/mysql_33036/logs/binlog
slow_query_log_file             = /r2/mysqldata/mysql_33036/logs/slowlogs/slow.log
plugin_dir                      = /usr/local/mysql56/lib/plugin
################################################################
################################################################
[mysqld]

wait_timeout                    = 31536000
#interactive_timeout            = 600
sql_mode                        = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
skip_name_resolve               = 1
lower_case_table_names          = 0
character-set-server            = utf8
#auto_increment_increment       = 1
#auto_increment_offset          = 1
init_connect                    = 'set name utf8;'
#log_timestamps                  = system
tmpdir                          = /r2/mysqldata
#plugin_dir                      = /usr/local/mysql/lib/plugin
#==========================================================
#bin setting
#==========================================================
binlog_format                   = MIXED
log_bin_trust_function_creators = 1
binlog_cache_size               = 64M
max_binlog_cache_size           = 1G
max_binlog_size                 = 512M
expire_logs_days                = 7

#==========================================================
# replication relay-log
#==========================================================
log-slave-updates               = 1
slave-net-timeout               = 60
sync-master-info                = 1
sync-relay-log                  = 1
sync-relay-log-info             = 1
#==========================================================
#no need to sync database
#==========================================================
binlog-ignore-db                = test
binlog-ignore-db                = information_schema
binlog-ignore-db                = mysql
#==========================================================
#performance setting
#==========================================================
open_files_limit                = 1024000
max_connections                 = 1000
max_user_connections            = 9990
max_connect_errors              = 100000
table_open_cache                = 1024
max_allowed_packet              = 32M
thread_cache_size               = 64
max_heap_table_size             = 16M
query_cache_type                = 0
###global cache ###
key_buffer_size                 = 16M
query_cache_size                = 0
###session cache ###
sort_buffer_size                = 8M       #排序緩衝
join_buffer_size                = 4M       #錶鏈接緩衝
read_buffer_size                = 8M       #順序讀緩衝
read_rnd_buffer_size            = 8M       #隨機讀緩衝
tmp_table_size                  = 32M      #內存臨時表
binlog_cache_size               = 4M       #二進制日誌緩衝
thread_stack                    = 256KB    #線程的堆棧的大小
#==========================================================
#innodb setting
#==========================================================
default-storage-engine          = InnoDB
innodb_buffer_pool_size         = 512M
innodb_open_files               = 1000
innodb_flush_log_at_trx_commit  = 1
innodb_file_per_table           = 1
innodb_flush_method             = O_DIRECT
innodb_log_file_size            = 128M
innodb_log_files_in_group       = 2
innodb_data_file_path           = ibdata1:128M:autoextend
innodb_buffer_pool_instances    = 8
innodb_lock_wait_timeout        = 5
innodb_io_capacity              = 1000
innodb_io_capacity_max          = 20000
innodb_large_prefix             = 0
innodb_thread_concurrency       = 64
innodb_strict_mode              = OFF
innodb_sort_buffer_size         = 4194304
innodb_file_format              = Barracuda
innodb_file_format_max          = Barracuda
#==========================================================
#slow setting
#==========================================================
slow-query-log = on
long_query_time = 1

[mysqld-5.7]
innodb_buffer_pool_dump_pct     = 40
innodb_page_cleaners            = 4
innodb_undo_log_truncate        = 1
innodb_max_undo_log_size        = 1G   # 該參數減少到1G
innodb_purge_rseg_truncate_frequency = 128
binlog_gtid_simple_recovery     = 1
log_timestamps                  = system
transaction_write_set_extraction= MURMUR32
show_compatibility_56           = on

5. 安裝多實例

yum remove MariaDB-common MariaDB-compat MariaDB-server                  --rhel7刪除mariadb
yum install gcc gcc-c++ bzip2 bzip2-devel bzip2-libs python-devel -y     --安裝mysql環境包
tar zxvf  mysql-5.6.36-linux-glibc2.5-x86_64.tar.gz -C /usr/local/       --解壓mysql到/usr/local目錄
tar zxvf  mysql-5.7.18-linux-glibc2.5-x86_64.tar.gz -C /usr/local/       --同上
cd /usr/local/
ln -s mysql-5.7.18-linux-glibc2.5-x86_64/ mysql                          --建立軟鏈接
ln -s mysql-5.6.36-linux-glibc2.5-x86_64/ mysql56                        --同上
groupadd mysql && useradd -r -g mysql -s /bin/false mysql                --添加用戶
mkdir -p  /r2/mysqldata/                                                 --建立主目錄
chown -R mysql:mysql /usr/local/mysql                                    --受權訪問mysql-5.7.18-linux-glibc2.5-x86_64
chown -R mysql:mysql  /r2/mysqldata/                                     --同上
chmod 750 /r2/mysqldata/                                                 --添加權限
chmod 750 /usr/local/mysql                                               --同上
mv /tmp/multi_my.cnf  /etc/my.cnf                                        --multi_my.cnf配置文件上面已附上

--下面添加到環境變量
cat <<EOF >>/etc/profile
export PATH=\$PATH:/usr/local/mysql/bin/    
EOF
source /etc/profile
echo $PATH

--開始建立並初始化mysqld1 （mysql5.7臨時密碼在日誌輸出上面有提示，下同）
mkdir -p /r2/mysqldata/mysql_33016/{logs,data}
chown -R mysql.mysql  /r2/mysqldata/mysql_33016
chmod 755 /r2/mysqldata/mysql_33016/
cd /usr/local/mysql/bin/
./mysqld  --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/r2/mysqldata/mysql_33016/data/  


--開始建立並初始化mysqld2
mkdir -p /r2/mysqldata/mysql_33026/{logs,data}
chown -R mysql.mysql  /r2/mysqldata/mysql_33026
cd /usr/local/mysql/bin/
./mysqld  --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/r2/mysqldata/mysql_33026/data/  


--開始建立並初始化mysqld3 （mysql5.6初始化密碼是空）
mkdir -p /r2/mysqldata/mysql_33036/{logs,data}
chown  -R mysql.mysql  /r2/mysqldata/mysql_33036
cd /usr/local/mysql56/
./scripts/mysql_install_db  --user=mysql --basedir=/usr/local/mysql56 --datadir=/r2/mysqldata/mysql_33036/data/ 

-- 安裝後，須要檢查mysql_error.log 確保沒有錯誤出現

啓動數據庫，並修改root帳號，受權其餘帳號

--使用mysqld_multi啓動，mysqld_multi [OPTIONS] {start|reload|stop|report} [GNR,GNR,GNR...]

[root@multi mysql56]# mysqld_multi start 1
[root@multi mysql56]# mysqld_multi start 2
[root@multi mysql56]# mysqld_multi start 3
[root@multi mysql56]# mysqld_multi report
Reporting MySQL servers
MySQL server from group: mysqld1 is running
MySQL server from group: mysqld2 is running
MySQL server from group: mysqld3 is running
--查看三個mysql端口
[root@multi mysql56]# netstat -tunlp | grep mysql
tcp6       0      0 :::33036                :::*                    LISTEN      35400/mysqld
tcp6       0      0 :::33016                :::*                    LISTEN      37735/mysqld
tcp6       0      0 :::33026                :::*                    LISTEN      37738/mysqld

-- 使用sock進行登陸，並輸入臨時密碼後，修改密碼，以下：
root@multi mysqldata]# mysql -uroot -p  -S /r2/mysqldata/mysql_33016/mysql.sock
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 20
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>alter user 'root'@'localhost' identified by 'iforgot' ; 
mysql>create user 'multi_admin'@'localhost' identified by '123456';
mysql>grant shutdown on *.* to 'multi_admin'@'localhost';   
mysql>flush privileges;
mysql>exit;

--mysqld2 同上；mysqld3 因爲是mysql5.6.36版本直接使用mysql -S /r2/mysqldata/mysql_33036/mysql.sock登錄

[root@multi mysqldata]# mysql -S /r2/mysqldata/mysql_33036/mysql.sock
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 147
Server version: 5.6.36-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>set password=password('iforgot');
mysql>create user 'multi_admin'@'localhost' identified by '123456';
mysql>grant shutdown on *.* to 'multi_admin'@'localhost';   
mysql>flush privileges;
mysql>exit;

檢測port和socket

[root@multi mysql56]#  ps -ef | grep mysqld
mysql     35400      1  0 14:56 pts/1    00:00:10 /usr/local/mysql56/bin/mysqld --server-id=33036 --user=mysql --port=33036 --socket=/r2/mysqldata/mysql_33036/mysql.sock --basedir=/usr/local/mysql56 --datadir=/r2/mysqldata/mysql_33036/data --pid_file=/r2/mysqldata/mysql_33036/data/mysql.pid --log_error=/r2/mysqldata/mysql_33036/logs/mysql_error.log --log_bin=/r2/mysqldata/mysql_33036/logs/binlog --slow_query_log_file=/r2/mysqldata/mysql_33036/logs/slowlogs/slow.log --plugin_dir=/usr/local/mysql56/lib/plugin
mysql     37735      1  0 16:33 pts/1    00:00:05 mysqld --server-id=33016 --group_concat_max_len=102400 --user=mysql --port=33016 --socket=/r2/mysqldata/mysql_33016/mysql.sock --basedir=/usr/local/mysql --datadir=/r2/mysqldata/mysql_33016/data --pid_file=/r2/mysqldata/mysql_33016/data/mysql.pid --log_error=/r2/mysqldata/mysql_33016/logs/mysql_error.log --log_bin=/r2/mysqldata/mysql_33016/logs/binlog --slow_query_log_file=/r2/mysqldata/mysql_33016/logs/slow.log --log_timestamps=system
mysql     37738      1  0 16:33 pts/1    00:00:04 mysqld --server-id=33026 --user=mysql --port=33026 --socket=/r2/mysqldata/mysql_33026/mysql.sock --basedir=/usr/local/mysql --datadir=/r2/mysqldata/mysql_33026/data/ --pid_file=/r2/mysqldata/mysql_33026/data/mysql.pid --log_error=/r2/mysqldata/mysql_33026/logs/mysql_error.log --log_bin=/r2/mysqldata/mysql_33026/logs/binlog --slow_query_log_file=/r2/mysqldata/mysql_33026/logs/slow.log --log_timestamps=system

-- 上面是mysqld_safe的進程

設置login-path

設置login-path主要爲了可以簡化登陸，同時還可讓每一個數據庫的密碼都不一樣，避免使用[client]下的統一用戶名密碼session

[root@multi mysqldata]# mysql_config_editor  set -G mysqld1 -u root -p   -S /r2/mysqldata/mysql_33016/mysql.sock
Enter password:

[root@multi mysqldata]# mysql_config_editor  set -G mysqld2 -u root -p   -S /r2/mysqldata/mysql_33026/mysql.sock
Enter password:

[root@multi mysqldata]# mysql_config_editor  set -G mysqld3 -u root -p   -S /r2/mysqldata/mysql_33036/mysql.sock
Enter password:
[root@multi mysqldata]#

-- 而後可使用mysql --login-path=mysql1 這種方式登陸

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