QMole – The World of Linux on an IPad Near You

Have you noticed that many stock applications which are free on Linux require payment on the IPhoneTM  and IPad TM? Don’t want to re-implement Linux software on IOSTM ?  QMole is the answer. QMole is a new desktop system allowing the free operation of software ported from the world of Linux on the IPad. The technology enables retaining a touch screen operation of stock GTK Linux applications without requiring their redesign or reimplementation. Unlike remote desktop solutions that require a network connection, QMole requires none. All “Linux” applications execute locally on iPad TM, just like native IOS TM applications.

http://youtu.be/ofk0M1LjdtU

How to create DB replication in MySql from command line

Make sure you have entries for both primary and standby servers in /etc/hosts files in both primary and standby machines.

[root@primaryhostname bin]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost
::1             localhost6.localdomain6 localhost6
10.64.30.8 primaryhostname
10.64.30.9 standbyhostname

[root@standbyhostnamebin]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost
::1             localhost6.localdomain6 localhost6
10.64.30.8 primaryhostname
10.64.30.9 standbyhostname
 
Run on primary server:
======================
GRANT ALL PRIVILEGES ON *.* TO root@'primaryhostname' IDENTIFIED BY '';
GRANT ALL PRIVILEGES ON *.* TO root@'standbyhostname' IDENTIFIED BY '';
CREATE USER 'repl'@'primaryhostname' IDENTIFIED BY '';
GRANT REPLICATION SLAVE ON *.* TO 'repl@'standbyhostname' IDENTIFIED BY '';
FLUSH PRIVILEGES;
show master status;
mysql> show master status;
+----------------+----------+--------------+------------------+
| File           | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------+----------+--------------+------------------+
| log-bin.000001 |      98| ManuAppl     | mysql            |
+----------------+----------+--------------+------------------+
1 row in set (0.00 sec)
(Note down the File and Position)

Run on standby server:
======================
GRANT ALL PRIVILEGES ON *.* TO root@'primaryhostname' IDENTIFIED BY '';
GRANT ALL PRIVILEGES ON *.* TO root@'standbyhostname' IDENTIFIED BY '';
CREATE USER 'repl'@'standbyhostname' IDENTIFIED BY '';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'primaryhostname' IDENTIFIED BY '';
FLUSH PRIVILEGES;
show master status;
(Note down the File and Position)


Run on primary server:
======================

CHANGE MASTER TO MASTER_HOST='standbyhostname', MASTER_PORT=3306, MASTER_USER='repl', MASTER_PASSWORD='', MASTER_LOG_POS=98, MASTER_LOG_FILE='log-bin.000001';
START SLAVE;

Run on standby server:
======================
CHANGE MASTER TO MASTER_HOST='primaryhostname', MASTER_PORT=3306, MASTER_USER='repl', MASTER_PASSWORD='', MASTER_LOG_POS=98, MASTER_LOG_FILE='log-bin.000001';
START SLAVE;

Taking java heap dump and thread dump in linux from command line

Taking java heap dump:
======================
jmap -dump:format=b,file=output_file.bin PID_of_process

Example:   /usr/java/jdk1.7.0_55/bin/jmap -dump:format=b,file=/tmp/heapdump_PID_15034.bin 15034

Taking java thread dump:
========================
jstack -l >output_file.txt
Example:   /usr/java/jdk1.7.0_55/bin/jstack -l 15034 >/tmp/threaddump.txt