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| 75 | 我們假設我們已經在 Master1 建夠好一個 exampledb 並且存有資料表與相關資料內容. 接著我們要做的就是設定 exampledb 的副本到 Master2 , 接著也可將 Master2 的 exampledb 複製喔份回去Master1. 在設定資料庫複製 (MySQL Replication) 的同時我們先在 Master2 上建一個空的資料庫:exampledb. [[BR]] |
| 76 | |
| 77 | '''/* @Master2 */''' [[BR]] |
| 78 | 使用指令[[BR]] |
| 79 | |
| 80 | ''root@ocean:~$ mysql -u root -p''[[BR]] -> 登入MySQL |
| 81 | |
| 82 | ''CREATE DATABASE exampledb;[[BR]]quit;[[BR]]'' |
| 83 | |
| 84 | === Part2: 設定資料庫複製(Replication) === |
| 85 | |
| 86 | 首先我們要透過編輯 /etc/mysql/my.cnf 來完成 master-master replication 的設定, 而 master-master replication 最重要的兩個設定選項就是 auto_increment_increment & auto_increment_offset [[BR]] |
| 87 | |
| 88 | auto_increment_increment: 控制連續性增量的AUTO_INCREMENT值. [[BR]] |
| 89 | auto_increment_offset: 決定AUTO_INCREMENT欄位的起始值. [[BR]] |
| 90 | |
| 91 | 假設我們有 N 個 MySQL nodes (本範例是兩個nodes,所以 N=2),因此 "auto_increment_increment" 在每各node的值都是 2 , 而每各node都必須給 "value for auto_increment_offset" 一各不同的值(1, 2, ..., N). 而接下來我們便要開始設定本範例中的兩各 MySQL nodes. [[BR]] |
| 92 | |
| 93 | '''/* @Master1 */''' [[BR]] |
| 94 | '''步驟一 :''' 編輯 /etc/mysql/my.cnf -> 從[mysqld]開始新增以下的選項,並且將有衝突的相關選項給註釋掉. |
| 95 | |
| 96 | 使用指令[[BR]] |
| 97 | |
| 98 | ''root@ocean:~$ vim /etc/mysql/my.cnf''[[BR]] |
| 99 | |
| 100 | {{{ |
| 101 | [...] |
| 102 | [mysqld] |
| 103 | # |
| 104 | # * Basic Settings |
| 105 | # |
| 106 | |
| 107 | # |
| 108 | # * IMPORTANT |
| 109 | # If you make changes to these settings and your system uses apparmor, you may |
| 110 | # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. |
| 111 | # |
| 112 | server-id = 1 |
| 113 | replicate-same-server-id = 0 |
| 114 | auto-increment-increment = 2 |
| 115 | auto-increment-offset = 1 |
| 116 | |
| 117 | master-host = 192.168.0.101 |
| 118 | master-user = slave1_user |
| 119 | master-password = slave1_password |
| 120 | master-connect-retry = 60 |
| 121 | replicate-do-db = exampledb |
| 122 | |
| 123 | log-bin = /var/log/mysql/mysql-bin.log |
| 124 | binlog-do-db = exampledb |
| 125 | |
| 126 | relay-log = /var/lib/mysql/slave-relay.log |
| 127 | relay-log-index = /var/lib/mysql/slave-relay-log.index |
| 128 | |
| 129 | expire_logs_days = 10 |
| 130 | max_binlog_size = 500M |
| 131 | [...] |
| 132 | }}} |
| 133 | |
| 134 | '''步驟二 :''' 重新啟動 MySQL |
| 135 | 使用指令[[BR]] |
| 136 | |
| 137 | ''root@ocean:~$ /etc/init.d/mysql restart''[[BR]] |
| 138 | |
| 139 | |
| 140 | '''/* @Master2 */''' [[BR]] |
| 141 | '''步驟三 :''' 對 Master2 重複相同的設定步驟(步驟一 ~ 步驟二)-> 編輯 /etc/mysql/my.cnf -> 從[mysqld]開始新增以下的選項,並且將有衝突的相關選項給註釋掉.再重新啟動MySQL |
| 142 | |
| 143 | 使用指令[[BR]] |
| 144 | |
| 145 | ''root@ocean:~$ vim /etc/mysql/my.cnf''[[BR]] |
| 146 | |
| 147 | {{{ |
| 148 | [...] |
| 149 | [mysqld] |
| 150 | # |
| 151 | # * Basic Settings |
| 152 | # |
| 153 | |
| 154 | # |
| 155 | # * IMPORTANT |
| 156 | # If you make changes to these settings and your system uses apparmor, you may |
| 157 | # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. |
| 158 | # |
| 159 | server-id = 2 |
| 160 | replicate-same-server-id = 0 |
| 161 | auto-increment-increment = 2 |
| 162 | auto-increment-offset = 2 |
| 163 | |
| 164 | master-host = 192.168.0.100 |
| 165 | master-user = slave2_user |
| 166 | master-password = slave2_password |
| 167 | master-connect-retry = 60 |
| 168 | replicate-do-db = exampledb |
| 169 | |
| 170 | log-bin= /var/log/mysql/mysql-bin.log |
| 171 | binlog-do-db = exampledb |
| 172 | |
| 173 | relay-log = /var/lib/mysql/slave-relay.log |
| 174 | relay-log-index = /var/lib/mysql/slave-relay-log.index |
| 175 | |
| 176 | expire_logs_days = 10 |
| 177 | max_binlog_size = 500M |
| 178 | [...] |
| 179 | }}} |
| 180 | |
| 181 | ''root@ocean:~$ /etc/init.d/mysql restart''[[BR]] |
| 182 | |
| 183 | '''/* @Master1 */''' [[BR]] |
| 184 | '''步驟四 :''' 我們將鎖定在 Master1 上的 exampledb 資料庫, 且查詢 Master1 的主機狀態資訊而將 exampledb 給 dump(傾倒)出來 (因為我們待會要將傾倒出來的 exampledb 匯入到 Master2去,這樣兩各nodes的資料庫都將會有相同的資料), 最後將 exampledb 資料庫給解鎖(unlock)以便後續使用.[[BR]] |
| 185 | |
| 186 | 使用指令[[BR]] |
| 187 | |
| 188 | ''root@ocean:~$ mysql -u root -p''[[BR]] |
| 189 | |
| 190 | ''USE exampledb;[[BR]]FLUSH TABLES WITH READ LOCK;[[BR]]SHOW MASTER STATUS;[[BR]]'' |
| 191 | |
| 192 | 接著應該會顯示如下的資訊 (請將他記下來之後會有用) [[BR]] |
| 193 | |
| 194 | {{{ |
| 195 | mysql> SHOW MASTER STATUS; |
| 196 | +------------------+----------+--------------+------------------+ |
| 197 | | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | |
| 198 | +------------------+----------+--------------+------------------+ |
| 199 | | mysql-bin.000009 | 98 | exampledb | | |
| 200 | +------------------+----------+--------------+------------------+ |
| 201 | 1 row in set (0.00 sec) |
| 202 | |
| 203 | mysql> |
| 204 | }}} |
| 205 | |
| 206 | |
| 207 | |
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| 209 | |