Following is a guid to install Redmine (svn trunk) on Ubuntu 9.10.

The assumed location of Redmine is /srv/redmine

Phase 1: Setup Redmine

Step 1
Install required packages.

Step 2
Check out Redmine trunk.

Step 3
Install required ruby gems:

Note 1: We may need to update Rails RAILS_GEM_VERSION in file [redmine]/config/environment.rb to reflect actual version of Rails gems installed.

Note 2: We may need to create soft link for rails & mongrel executables for convenient

Step 4
Create mysql database

Run the following code in mysql, substitute your own database name, password, …

Step 5
Create/Update database parameters in [redmine]/config/database.yml accordingly to prior step info.

Step 6
Initialize the database

Step 7
Create redmine user & setting up directory permission

Step 8
Testing the application server

The server is listening on [http://localhost:3000].

Phase 2: Setup Apache & Mongrel Cluster

Step 1
Create mongrel cluster configuration files for Redmine.

Step 2
Create apache virtual host file at /etc/apache/sites-available/

Step 3
Turn on the virtual host and required modules

Phase 3: Surviving the reboot & G!Mail SMTP

Step 1
Create global mongrel_cluster configuration

$ sudo mkdir /etc/mongrel_cluster
$ cd /etc/mongrel_cluster
$ sudo ln -s /srv/redmine/config/mongrel_cluster.yml /etc/mongrel_cluster/redmine.yml

Step 2
Update the services

$ cd /etc/init.d
$ sudo cp /var/lib/gems/1.8/gems/mongrel_cluster-1.0.5/resources/mongrel_cluster /etc/init.d/
$ sudo chmod +x /etc/init.d/mongrel_cluster
$ sudo /usr/sbin/update-rc.d -f mongrel_cluster defaults

Step 3
Configure G!Mail

$ sudo ruby script/plugin install git://github.com/collectiveidea/action_mailer_optional_tls.git

# File: config/email.yml
production:
  delivery_method: :smtp
  smtp_settings:
    tls: true
    address: "smtp.gmail.com"
    port: '587'
    domain: "smtp.gmail.com"
    authentication: :plain
    user_name: "your_email@gmail.com"
    password: "your_password"

References

1. http://www.redmine.org/wiki/redmine/RedmineInstall
2. http://ubuntuforums.org/showthread.php?t=674598
3. http://azureusonrails.rubyforge.org/wiki/wiki.pl?Install/Mongrel_Cluster_With_Apache_2.2
4. http://redmineblog.com/articles/setup-redmine-to-send-email-using-gmail/

When developing with CakePHP, we can setup Apache to automatically redirect a domain to a specific CakePHP application.

We can set computer’s aliases using hosts file. Apache will automatically map aliases to different DocumentRoot:

app1.mybox.com -> /var/www/cakephp/app1.mybox.com/webroot
app2.somewhere.com -> /var/www/cakephp/app2.somewhere.com/webroot

Step 1: Enable the mod_vhost_alias:

Step 2: Replace the DocumentRoot statement in default virtualhost configuration file with two lines:

(If you use a different virtualhost, make sure that you’re editing the right configuration file)

Step 3: However, the mod_rewrite doesn’t play nice with mod_vhost_alias. We need to edit the .htaccess file in {APP}/webroot folder.

Step 4: Restart Apache.

Below is my default virtual host configuration for your reference:

In Linux, files which name start by a dot ‘.’ are hidden by default in most file managers. However, there are cases when we want to hide dot-file from our view. For examples:

• Desktop folder in our home folder.
• Dropbox
• lost+found directory at the partition root
• …

In Nautilus (default GNOME file manager) there’s a way. Add a file named

with each line is the name of the file/folder you want to hide.

For example, if you want to hide Desktop from home folder you may type this command in the terminal:

Note: This trick only works in Nautilus. It won’t work in Konqueror or Dolphin. I don’t know if it works in other file managers or not.

The GNOME-Colors is a project that aims to make the GNOME desktop as elegant, consistent and colorful as possible.

The current goal is to allow full color customization of themes, icons, GDM logins and splash screens. There are already five full color-schemes available; Brave (Blue), Human (Orange), Wine (Red), Noble (Purple) and Wise (Green).

GNOME-Colors is mostly inspired/based on Tango, GNOME, Elementary, Tango-Generator and many other open-source projects.

via gnome-colors – Google Code.

Here is a way to rename files in bash, from upper case filenames to lowercase ones

via Rename files from upper case filename to lower case (in bash).

Pyinotify is a pure Python module for monitoring filesystems changes. Pyinotify relies on inotify, a Linux Kernel functionnality (since kernel 2.6.13). inotify is an event-driven notification mechanism, its notifications are exported to user space through three system calls. Pyinotify binds these system calls and provides an implementation on top of them.

via Pyinotify.

Khi bạn làm việc với máy chủ thông qua SSH thì bạn sẽ thường gặp một vấn đề nhỏ. Đó là dịch vụ SSH sẽ đóng kết nối của bạn sau một khoảng thời gian nhất định. Để ngăn dịch vụ SSH đóng kết nối thì chúng ta có cách sau:

Sửa file

hoặc

và thêm vào đó dòng dưới đây

Chương trình C nhỏ dưới đây có thể giúp bạn tạm giữ một phiên làm việc bằng cách in ra một thanh xoay trong lúc chạy.