********************************************************** 第三部分, 在一台服務器構建多mysql 從服務。 ********************************************************** 構建從服務器的預選準備: 建議用mysqld_multi 把主服
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第三部分, 在一台服務器構建多mysql 從服務。
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構建從服務器的預選準備: 建議用mysqld_multi 把主服務器的mysql全部停掉.刪除數據目錄中的所有除數據庫目錄以外的任何文件(此文中的數據目錄庫有４個,datadir = /usr/local/mysql/中的 data1 -- data1)．建主從都用相同的數據目錄路徑．
用Tar 命令把每數據庫封裝起來，並通過sftp命令put/get到從服務器(db-app1 192.168.0.101)。
下列操作供參考:
在db-app主機上的操作
db-app:/ # tar -cf data1.tar /usr/local/mysql/data1
db-app:/ # tar -cf data2.tar /usr/local/mysql/data2
db-app:/ # tar -cf data3.tar /usr/local/mysql/data3
db-app:/ # tar -cf data4.tar /usr/local/mysql/data4
在db-app1主機上的操作
db-app1:/ # tar xvf data1.tar
db-app1:/ # tar xvf data2.tar
db-app1:/ # tar xvf data3.tar
db-app1:/ # tar xvf data4.tar
同時，請確認系統帳號mysql是否對主/從服務器的中的mysql數據目錄都有操作權限，如果無法確認，你直接更修改這些目錄的所有權即可。
在db-app主機上的操作
db-app:/ # chown mysql.mysql /usr/local/mysql/data1 -R
db-app:/ # chown mysql.mysql /usr/local/mysql/data2 -R
db-app:/ # chown mysql.mysql /usr/local/mysql/data3 -R
db-app:/ # chown mysql.mysql /usr/local/mysql/data4 -R
在db-app1主機上的操作
db-app1:/ # chown mysql.mysql /usr/local/mysql/data1 -R
db-app2:/ # chown mysql.mysql /usr/local/mysql/data2 -R
db-app3:/ # chown mysql.mysql /usr/local/mysql/data3 -R
db-app4:/ # chown mysql.mysql /usr/local/mysql/data4 -R
下面就是從服務器上/etc/my.cnf的全部內容。
提示:下面的my.cnf中將會提到一個帳號:repl, 口令為:'1234567890', 這個帳號就是上面專門建立的。
其實都一樣,主要是修改my.cnf中的內容,讓每個從mysql通過主mysql的不同的端口,去獲取各自bin-log來更新自生的數據庫內容．現貼上我的my.cnf全部內容(從服務器),相關參數與請參考mysql 官文手冊。
#[client]
#password = your_password
#port = 3306
#socket = /tmp/mysql.sock
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = mysql
password = netmoniit
[mysqld1]
port = 3306
socket = /tmp/mysql.sock1
skip-locking
pid-file=/usr/local/mysql/data/net-app1a.pid
datadir = /usr/local/mysql/data
log=/usr/local/mysql/data/net-app1.log
user = mysql
log-slow-queries=/usr/local/mysql/data/slowquery.log
long_query_time = 2
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
myisam_sort_buffer_size = 64M
thread_cache = 32
query_cache_size = 32M
thread_concurrency = 2
max_connections=500
server-id = 2
master-host = 192.168.0.100
master-user = 'repl'
master-password = '1234567890'
master-port = 3309
report-host = net-app1
master-connect-retry = 30
log-bin
log-slave-updates
[mysqld2]
port = 3307
socket = /tmp/mysql.sock2
pid-file = /usr/local/mysql/data2/net-app1b.pid
datadir = /usr/local/mysql/data2
log=/usr/local/mysql/data2/net-app1.log
user = mysql
log-slow-queries=/usr/local/mysql/data2/slowquery.log
long_query_time = 10
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 1M
read_buffer_size = 1M
myisam_sort_buffer_size = 32M
thread_cache = 32
query_cache_size = 16M
thread_concurrency = 2
max_connections=300
server-id = 2
master-host = 192.168.0.100
master-user = 'repl'
master-password = '1234567890'
master-port = 3309
report-host = net-app1
master-connect-retry = 30
log-bin
log-slave-updates
[mysqld3]
port = 3308
socket = /tmp/mysql.sock3
pid-file = /usr/local/mysql/data3/net-app1c.pid
datadir = /usr/local/mysql/data3
log=/usr/local/mysql/data3/net-app1.log
user = mysql
log-slow-queries=/usr/local/mysql/data3/slowquery.log
long_query_time = 10
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 1M
read_buffer_size = 1M
myisam_sort_buffer_size = 32M
thread_cache = 32
query_cache_size = 16M
thread_concurrency = 2
max_connections=300
server-id = 2
master-host = 192.168.0.100
master-user = 'repl'
master-password = '1234567890'
master-port = 3309
report-host = net-app1
master-connect-retry = 30
log-bin
log-slave-updates
[mysqld3]
port = 3308
socket = /tmp/mysql.sock4
pid-file = /usr/local/mysql/data4/net-app1d.pid
datadir = /usr/local/mysql/data4
log=/usr/local/mysql/data4/net-app1.log
user = mysql
log-slow-queries=/usr/local/mysql/data4/slowquery.log
long_query_time = 10
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 1M
read_buffer_size = 1M
myisam_sort_buffer_size = 32M
thread_cache = 32
query_cache_size = 16M
thread_concurrency = 2
max_connections=300
server-id = 2
master-host = 192.168.0.100
master-user = 'repl'
master-password = '1234567890'
master-port = 3309
report-host = net-app1
master-connect-retry = 30
log-bin
log-slave-updates
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
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在功告成,現在分別啟動兩台主機上的多mysql服務，這樣，每個主服務的每個mysql有變化，都會自動復制／更新到從服務器對應的數據庫中。
db-app:/ # /usr/local/mysq/bin/mysqld_multi --config-file=/etc/my.cnf start 1-4
db-app1:/ # /usr/local/mysq/bin/mysqld_multi --config-file=/etc/my.cnf start 1-4
