my-whiteboard http://www.my-whiteboard.com Business in Information Technology & Biotechnology Wed, 23 Jul 2008 00:58:32 +0000 http://wordpress.org/?v=2.6 en How to Secure Linux Server: disable root login, enable sudo http://www.my-whiteboard.com/linux-admin/how-to-secure-linux-server-disable-root-login-enable-sudo.html http://www.my-whiteboard.com/linux-admin/how-to-secure-linux-server-disable-root-login-enable-sudo.html#comments Wed, 23 Jul 2008 00:54:50 +0000 PhDs http://www.my-whiteboard.com/linux-admin/how-to-secure-linux-server-disable-root-login-enable-sudo.html The following steps will make your Linux server more secure:

1, Edit sshd_config to disable root login.

vi /etc/ssh/sshd_config

make sure you have this line:

PermitRootLogin no

2, Change sshd port number to something other than 22, e.g.,

Port 1234

3, Make sure somebody can do su or sudo:

vi /etc/sudoers

add my name to sudo list:

bobsmith ALL=(ALL) ALL

4, Restart sshd

service sshd restart

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]]> http://www.my-whiteboard.com/linux-admin/how-to-secure-linux-server-disable-root-login-enable-sudo.html/feed How to migrate entire MySQL database from 32 bit Linux server to 64 bit Linux server http://www.my-whiteboard.com/mysql/how-to-migrate-entire-mysql-database-from-32-bit-linux-server-to-64-bit-linux-server.html http://www.my-whiteboard.com/mysql/how-to-migrate-entire-mysql-database-from-32-bit-linux-server-to-64-bit-linux-server.html#comments Tue, 22 Jul 2008 17:03:25 +0000 PhDs http://www.my-whiteboard.com/mysql/how-to-migrate-entire-mysql-database-from-32-bit-linux-server-to-64-bit-linux-server.html If you want to copy database from one server to another server with the same OS and same MySQL version, you can simply copy the binary files.

1, Shutdown Apache and MySQL

apachectl stop
mysqladmin -uroot -p shutdown

2, Go to your database file directory and make a tar ball:

tar cvf db.tar *

3, Copy tar file to proper directory on another server and restart MySQL

scp root@anotherserver:/disk2/mysqldb/db.tar .

Start MySQL and Apache

mysqld_safe &
apachectl start

But if you want to migrate database from 32 bit Linux server to 64 bit Linux server, you need to do the following.

1, Export database using mysqldump on 32 bit server

mysqldump -uroot -p --all-databases > db.dump

2, Copy dump file to 64 bit server

scp root@32bitserver:/disk2/mysqldb/db.dump .

3, Import database on 64 bit server

mysql < db.dump

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]]> http://www.my-whiteboard.com/mysql/how-to-migrate-entire-mysql-database-from-32-bit-linux-server-to-64-bit-linux-server.html/feed How to change Linux / Unix SSH Port http://www.my-whiteboard.com/linux-admin/how-to-change-linux-unix-ssh-port.html http://www.my-whiteboard.com/linux-admin/how-to-change-linux-unix-ssh-port.html#comments Mon, 21 Jul 2008 16:21:35 +0000 PhDs http://www.my-whiteboard.com/linux-admin/how-to-change-linux-unix-ssh-port.html To make your Linux server safer (to protect against SSH brute-force attacks), you can do the following to change SSH port.

vi /etc/ssh/sshd_config

change port from 22 to 2222

#Port 22
Port 2222

Then restart sshd

/etc/init.d/sshd reload

Use SSH:

ssh -p 2222 myservername

Use SCP:

scp -P 2222 myfile.txt me@myservername:/~/.

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]]> http://www.my-whiteboard.com/linux-admin/how-to-change-linux-unix-ssh-port.html/feed How to delete files in a directory with too many files on Linux (-bash: /bin/rm: Argument list too long) http://www.my-whiteboard.com/linux-admin/how-to-delete-files-in-a-directory-with-too-many-files-on-linux-bash-binrm-argument-list-too-long.html http://www.my-whiteboard.com/linux-admin/how-to-delete-files-in-a-directory-with-too-many-files-on-linux-bash-binrm-argument-list-too-long.html#comments Sat, 19 Jul 2008 22:23:57 +0000 PhDs http://www.my-whiteboard.com/linux-admin/how-to-delete-files-in-a-directory-with-too-many-files-on-linux-bash-binrm-argument-list-too-long.html If you try to delete all files in a directory with too many files, you will get this error:

-bash: /bin/rm: Argument list too long

Now you should delete the directory and recreate it.

rm -rf wp-content/cache
mkdir wp-content/cache
chmod 777 wp-content/cache
chown apache:apache wp-content/cache

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