How to replace gnome-screensaver with xscreensaver in ubuntu

(via www.ubuntugeek.com)

XScreenSaver is the standard screen saver collection shipped on most Linux and Unix systems running the X11 Window System.On X11 systems, XScreenSaver is two things: it is both a large collection of screen savers; and it is also the framework for blanking and locking the screen.

Small Office Linux OpenVPN Server

(via www.hollenback.net)

I recently set up a CentOS Linux OpenVPN server for a small office, and this is a complete howto writeup of the process. These instructions contain everything you need for configuring the server (including firewall rules!). Also included are complete instructions for setting up both mac and windows client machines.

SSL and subversion client

Unlike web browsers, the CA root cert is not installed by default for svn clients. You would need to tell the client where to find it in order to trust the ssl cert.

Reference: svnbook

For GoDaddy signed certs, download their root certs available at:

http://certificates.godaddy.com/repository

You would need both the pem encoded gd-class2-root.crt and gd_intermediate.crt .

Then in subversion client global settings, tell it the path to the certs:

ssl-authority-files = /path/to/gd-class2-root.crt;/path/to/gd_intermediate.crt

This should then trust the ssl cert.

Setup sudo access to mysql user

Here is how to give dba user sudo access as mysql user.

visudo and add:

dbauser ALL=(mysql) ALL

Basically, it defines that user "dbauser" can run all commands as "mysql" user.

For the dbauser to get mysql shell, run:

$ sudo -u mysql -i

File encryption with GnuPG

Encrypt file:

gpg -c private.txt

You will be prompted to enter a passphrase twice. The output is a file of the same name with ".gpg" as the extension.

Decrypt via:

gpg private.txt.gpg

By default the encrypted file is binary format with smaller file size. If you need ascii, then use the "-a" option which then outputs as "private.txt.asc".

Plesk imap connections limit

By default Plesk IMAP maximum connections per IP is set to 4. If you are using an email client that checks multiple mailboxes, this limit is easily reached.

To increase the limit, edit "/etc/courier-imap/imapd":

MAXDAEMONS=80
MAXPERIP=40

Domain searching with bash

Below is a simple bash script that uses the dictionary to go through 3 letter words and does a whois check to see if the domain is available. You probably won't find any of those as all would have been taken. May want to try with 5 or 6 letters instead, in which case change the value of "$count".

#!/bin/bash
# domain_search.sh

# Get a list of 3 letter domains.
for x in `cat /usr/share/dict/words`; do count=`echo $x| wc -m`; [ $count = 4 ] && echo $x; done > domains_list.txt

# Get whois record.
for x in `cat ./domains_list.txt` ; do (whois $x.com | grep -q '^No match for domain') && echo $x; sleep 60; done > domains_available.txt

# Change to lowercase and sort print.
cat domains_available.txt | tr [:upper:] [:lower:]|sort| uniq

gnome logout command

Logout using gnome command saving current session:

gnome-session-save --logout

Emma - Graphical toolkit for MySQL database developers and administrators

(via www.ubuntugeek.com)

Emma is a graphical toolkit for MySQL database developers and administrators. It provides dialogs to create or modify MySQL databases, tables, and associated indexes. The results of an executed query are displayed in a resultset where the record data can be edited by the user, if the SQL statemant allows for it. The SQL editor and resultset view are grouped in tabs. Results can be exported to CSV files. Multiple simultaneous opened MySQL connections are possible. Emma is the successor of yamysqlfront.

Serving ftp with vsftpd

vsftpd can be installed directly via yum and is a straight forward setup:

yum install vsftpd
chkconfig vsftpd on
service vsftpd start

The default vsftpd.conf should be fine to run with. However, it is best practice to disable anonymous access if not being used:

# cat /etc/vsftpd/vsftpd.conf | grep -v "#\|^$"
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=NO
nopriv_user=nobody
ftpd_banner=OK
listen=YES
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
log_ftp_protocol=YES
chroot_local_user=YES

For an incoming dropbox only option, use:

download_enable=NO
dirlist_enable=NO

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