為了對mycat做實驗，於是建立多例項mariadb，做以下筆記：
建立多例項資料庫資料夾：
[root@linux-node1 ~]# mkdir /home/multimysql
[root@linux-node1 ~]# mkdir /home/multimysql/
[root@linux-node1 ~]# mkdir /home/multimysql/datadir/
[root@linux-node1 ~]# chmod -r 777 /home/multimysql
初始化例項：
$ mysql_install_db --basedir=/usr --datadir=/home/multimysql/datadir/3307 --user=mysql
$ mysql_install_db --basedir=/usr --datadir=/home/multimysql/datadir/3308 --user=mysql
$ mysql_install_db --basedir=/usr --datadir=/home/multimysql/datadir/3309 --user=mysql
$ mkdir /home/multimysql/etc/my.cnf.d/
#vim /home/multimysql/etc/my.cnf.d/my.cnf
[mysqld]
skip-name-resolve
lower_case_table_names=1
innodb_file_per_table=1
back_log = 50
max_connections = 300
max_connect_errors = 1000
table_open_cache = 2048
max_allowed_packet = 16m
binlog_cache_size = 2m
max_heap_table_size = 64m
sort_buffer_size = 2m
join_buffer_size = 2m
thread_cache_size = 64
thread_concurrency = 8
query_cache_size = 64m
query_cache_limit = 2m
ft_min_word_len = 4
default-storage-engine = innodb
thread_stack = 192k
transaction_isolation = repeatable-read
tmp_table_size = 64m
log-bin=mysql-bin
binlog_format=row
slow_query_log
long_query_time = 1
server-id = 1
key_buffer_size = 8m
read_buffer_size = 2m
read_rnd_buffer_size = 2m
bulk_insert_buffer_size = 64m
myisam_sort_buffer_size = 128m
myisam_max_sort_file_size = 10g
myisam_repair_threads = 1
myisam_recover
innodb_additional_mem_pool_size = 16m
innodb_buffer_pool_size = 200m
innodb_data_file_path = ibdata1:10m:autoextend
innodb_file_io_threads = 8
innodb_thread_concurrency = 16
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 16m
innodb_log_file_size = 512m
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 60
innodb_lock_wait_timeout = 120
[mysqldump]
quick
max_allowed_packet = 256m
[mysql]
no-auto-rehash
prompt=\\u@\\d \\r:\\m>
[myisamchk]
key_buffer_size = 512m
sort_buffer_size = 512m
read_buffer = 8m
write_buffer = 8m
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit = 8192
vim /home/multimysql/etc/3307.cnf3307.cnf 檔案內容如下：
[client]
port = 3307
socket = /home/multimysql/socket/mysql3307.sock
[mysqld]
datadir=/home/multimysql/datadir/3307
port = 3307
server_id =1
socket = /home/multimysql/socket/mysql3307.sock
!includedir /home/multimysql/etc/my.cnf.d
3308.cnf 如下：
[client]
port = 3308
socket = /home/multimysql/socket/mysql3308.sock
[mysqld]
datadir=/home/multimysql/datadir/3308
port = 3308
socket = /home/multimysql/socket/mysql3308.sock
啟動例項：
/usr/bin/mysqld_safe --defaults-file=/home/multimysql/etc/3307.cnf &連線例項：
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