MySQL interface — PHP

Connect and Close connection to DB

$DB_HOST = “localhost”;

$DB_NAME = “mysql”;

$DB_USER = “mysql”;

$DB_PASS = “password”;

function conn_db(){

global $DB_HOST;

global $DB_USER;

global $DB_PASS;

global $DB_NAME;

if(!($conn = mysql_connect($DB_HOST, $DB_USER, $DB_PASS))) {

echo “Failed to connect DB”;

echo mysql_error($conn);

die;

}

if(!(mysql_select_db($DB_NAME))) {

echo “Failed to select DB”;

echo mysql_error($conn);

die;

}

return $conn;

}

function close_db($conn){

mysql_close($conn);

}

$conn = conn_db();

$sql = “select * from users where date>’20081001′ order by id”;

if (!($rs=mysql_query($sql))) {

echo mysql_error($conn);

die;

}

while ($row = mysql_fetch_array($rs)) {

echo “$row[0] $row[1]\n”;

}

Reset db slave

Some old data were missingon db slave server

copy data from master db01.lalife.net to slave db02.lalife.net and reset slave

On Master:

Lock table

mysql> FLUSH TABLES WITH READ LOCK;

mysql> show master status;

+——————+———-+————–+——————+

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+——————+———-+————–+——————+

| db01-bin.000901 | 84861692 |              |                  |

+——————+———-+————–+——————+

cd /var/lib

tar cvfz  TARFILE_NAME.tgz mysql/

mysql > unlock tables;

On Slave:

cd /var/tmp/

tar -zxvf db01_bk.tar.gz

service mysql stop

##backup old db

mv /www/mysql /www/mysql0603

mv /var/tmp/www/mysql/ /www/

service mysql start

mysql>STOP SLAVE;

mysql>RESET SLAVE;

mysql> CHANGE MASTER TO MASTER_HOST=’db001.lalife.net’, MASTER_USER=’replication’, MASTER_PASSWORD=’xxxxx’, MASTER_LOG_FILE=’db01-bin.000900′, MASTER_LOG_POS=13482116;

mysql>START SLAVE;

How to get master bin file and position:

On master server

mysql> show master status;
+——————+———–+————–+——————+
| File             | Position  | Binlog_Do_DB | Binlog_Ignore_DB |
+——————+———–+————–+——————+
| db01-bin.000900 | 437292441 |              |                  |
+——————+———–+————–+——————+

requiretty

Some cron didn’t work well after move to CentOS5

New to disable requiretty

May 19 10:40:01 xxx sudo:     root : sorry, you must have a tty to run sudo ; TTY=unknown ; PWD=/www/xxx/bin ; USER=xxx ; COMMAND=/bin/sh moviepagechmod.sh
vi /etc/sudoers
#Defaults    requiretty