Category: Computer

LAMP Stack on Gentoo Linux

There aren't many sites showing how to configure LAMP (Linux, Apache, MariaDB, PHP) stack on Gentoo. Since I'm new to Gentoo and in need of configuring LAMP stack, I compiled the steps.

Disclaimer:
The information in this site is the result of my researches in the Internet and of my experiences. This information below is solely used for my purpose and may not be suitable for others.

Apache:

Web Server. Install apache with the threads support.# echo "www-servers/apache threads" > /etc/portage/package.use/apache # emerge --ask www-servers/apache

Then, enable global apache2 support for other applications.# nvim /etc/portage/make.conf ========== .... USE="... apache2"

Once the USE variable in /etc/portage/make.conf is modified, update the system so the changes take effect.# emerge --ask --changed-use --deep @world

Start the apache2 process and make it so that it automatically restarts after each reboot.# /etc/init.d/apache2 start # rc-update add apache2 default

Apache - Virtual Hosts

Apache Virtual Hosts allows to run multiple instances of websites using a single IP address. This is a good option for me when I work on a few websites at the same time. Create a conf file under /etc/apache2/vhosts.d/ for each website.# nvim /etc/apache2/vhosts.d/site1.conf ========== <VirtualHost *:80> ServerAdmin email@localhost DocumentRoot /home/ubyt3m3/www/site1 ServerName site1 ErrorLog /var/log/apache2/site1.err CustomLog /var/log/apache2/site1.log combined <Directory "/home/ubyt3m3/www/site1"> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory> </VirtualHost> # nvim /etc/apache2/vhosts.d/site2.conf ========== <VirtualHost *:80> ServerAdmin email@localhost DocumentRoot /home/ubyt3m3/www/site2 ServerName site2 ErrorLog /var/log/apache2/site2.err CustomLog /var/log/apache2/site2.log combined <Directory "/home/ubyt3m3/www/site2"> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory> </VirtualHost>

Restart the apache2 process to reload the config file(s).# /etc/init.d/apache2 reload

Maria DB

MariaDB is a community-developed, open source relational database management system (RDBMS). It's a fork from MySQL which's owned by Oracle. # emerge --ask dev-db/mariadb

Auto start mysql after each reboot. # rc-update add mysql default

Now, it's time to configure MariaDB. With Gentoo, this can be done with emerge --config. # emerge --config dev-db/mariadb

This will create a database and set permissions. You will set a root password during this process.

Start the mysql process.# rc-service mysql start

PHP

Set USE flags for PHP and install it.# echo "dev-lang/php cgi cjk curl exif gd mysql mysqli pdo postgres threads xslt" > /etc/portage/package.use/php # emerge --ask dev-lang/php

Then, configure apache for PHP by updating /etc/conf.d/apache2.# nvim /etc/conf.d/apache2 ========== ... APACHE2_OPTS="... -D PHP" ...

Restart the apache2 process.# /etc/init.d/apache2 restart

Verify if PHP works with Apache$ nvim /home/ubyt3m3/www/site1/index.php ========== <html> <body> <?php phpinfo(); ?> </body> </html>

It works!

Troubleshooting 403 Fobidden Error

If the steps are followed, it's not the types of errors you get, but it's good to know how to approach when it happens.

  • Check to see if the directory and file permissions are properly set.

    Directory: 0755
    File: 0644

  • The default directory index page is there. It is defined in the DirectoryIndex directive in apache's modules.d/70_mod_php.conf file.

    DirectoryIndex index.php index.html

  • The Apache website mentions that the index of a directory is handled by mod_dir. In Gentoo, its config file is in modules.d/00_default_settings.conf. Add index.php in front of index.html should allow index.php loaded automatically.

    <IfModule dir_module>
    DirectoryIndex index.php index.html index.html.var
    </IfModule dir_module>

  • Make sure the correct directory permissions are set in the Directory directive in the apache's config file.

    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted

  • Check the error file for some hints.

    tail -f [path_to_apache_error_file]

That's all!
-gibb

Creating an ISO image from CD/DVD

I don't make ISO imges from CD or DVD that often but once in a while, I need to do this. So, to remind myself, here is the steps.

Disclaimer:
The information in this site is the result of my researches in the Internet and of my experiences. This information below is solely used for my purpose and may not be suitable for others.

1) Use isoinfo to find block/volume sizes

Gentoo Linux does not come with isoinfo, so it needs to be installed.# emerge --ask app-cdr/cdrtools # isoinfo -d -i /dev/sr0 | grep -i -E 'block size|volume size' Logical block size is: 2048 Volume size is: 1327235

isoinfo
  • -d: Print information from the primary volume descriptor (PVD) of the iso9660 image.
  • -i: Specifies the path of the iso9660 image to examine (/dev/sr0).
grep
  • -i: Ignore cases.
  • -E: Interpret 'block size|volume size' as extended regular expressions.

2) Use dd to create an ISO image

# dd if=/dev/sr0 of=<name_of_image>.iso bs=<block_size_from_above> count=<volume_size_from_above> status=progress

That's all!
-gibb

Working with rxvt-unicode

I've been using rxvt-unicode (urxvt) since the Openbox days. I like it because it's lightweight and highly configurable. Best of all, it's Desktop Environment independent, unlike Konsole for KDE and GNOME Terminal for GNOME.

When I switched the distro from Slackware to Gentoo on my main workstation, I revisited its configuration and started fiddling. I learned quite a lot of things that I didn't know how to do or cared about back then.

Disclaimer:
The information in this site is the result of my researches in the Internet and of my experiences. This information below is solely used for my purpose and may not be suitable for others.

Configuration File

Configuration of urxvt is done through ~/.Xresources. The details of the file can be referenced in Arch wiki. I didn't know this but you can include sub files for different applications in this file, like you'd do in many programming files.# cat ~/.Xresources ========================================== #include ".config/urxvt" #include ".config/xterm" ...But, I have the config only for urxvt so I didn't want to do this.

Fonts

I used to have problems setting fonts properly in urxvt and it was a tedious process. When I updated the file, I logged out and back in to see the changes reflected because I didn't know other ways to let the changes have effect. But it's no more. There is a way to load the file without logging out/in. # xrdb ~/.Xresources

That's it. If there is an error in .Xresources, it'll mention in its output though messages can be sometime cryptic.

Also, there is a way to test if specified font(s) is correct by running the following command: # urxvt -fn "xft:Inconsolata:size=13"

This opens up a new urxvt terminal with specified font type and size. That's how I test a font before I put it in the config file.

That's all!
-gibb

Getting Sound (ALSA) Working on Gentoo

I don't think this is limited to only Gentoo setup, but the sound isn't working after the installation. These are the steps I took to get my sound cards recognized by ALSA and got it working.

I use ALSA instead of PulseAudio with no particular reasonings. Some say ALSA is better or vice-versa, but I'm using it since I'm just used to.

I had a suspicion that the sound might not work after the installation. I ran alsamixer to test if my suspicion was right. Well, there was no alsamixer, so I installed media-sound/alsa-utils.# emerge --ask media-sound/alsa-utils

When alsamixer was executed, it returned the following error message as I suspected.$ alsamixer cannot open mixer: No such file or directory

The system recognizes its hardware and the driver seems to be installed but ALSA didn't see them.# lspci -k | grep -iA2 audio 00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) Subsystem: Hewlett-Packard Company SBx00 Azalia (Intel HDA) Kernel driver in use: snd_hda_intel -- 01:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1) Subsystem: eVga.com. Corp. GeForce GTS 450 Kernel driver in use: snd_hda_intel

But, ALSA didn't seem to recognize those sound cards.# cat /proc/asound/cards --- no soundcards ---

I google'd around and found that the HD-audio component consists of two parts, the driver (which I seem to have installed) and codec from the Linux Kernel site as well as some Gentoo forum posts.# dmsg | grep -i codec [ 1.626139] snd_hda_intel 0000:01:00.1: no codecs found!

Yup, I don't have codecs installed. I google'd again and found that conexant for my audio device. So, I searched that codec name in the kernel config file.# grep -i conexant /usr/src/linux/.config CONFIG_SND_HDA_CODEC_CONEXANT=n

I enabled the kernel options following by ALSA in Gentto Wiki, including SND_HDA_CODEC_CONEXANT, and rebuilt the kernel.# cd /usr/src/linux # make menuconfig # make && make modules_install # make install # shudown -r now

After the reboot, kernel version should be incremented/updated.# uname -v #3 SMP Thu Feb 13 14:46:50 EST

Codecs are now installed.# dmesg | grep -i codec [ 1.254990] snd_hda_codec_realtek hdaudioC0D0: ALC888: SKU not ready 0x411111f0 [ 1.255697] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC888: line_outs=4 (0x14/0x15/0x16/0x17/0x0) type:line [ 1.255879] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.256057] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0) [ 1.256231] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0 [ 1.256361] snd_hda_codec_realtek hdaudioC0D0: dig-out=0x11/0x1e [ 1.256491] snd_hda_codec_realtek hdaudioC0D0: inputs: [ 1.256623] snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19 [ 1.256768] snd_hda_codec_realtek hdaudioC0D0: Rear Mic=0x18 [ 1.256863] snd_hda_codec_realtek hdaudioC0D0: Line=0x1c [ 1.514180] snd_hda_codec_generic hdaudioC1D0: autoconfig for Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line [ 1.514376] snd_hda_codec_generic hdaudioC1D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.514544] snd_hda_codec_generic hdaudioC1D0: hp_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.514727] snd_hda_codec_generic hdaudioC1D0: mono: mono_out=0x0 [ 1.514829] snd_hda_codec_generic hdaudioC1D0: dig-out=0x5/0x0 [ 1.514967] snd_hda_codec_generic hdaudioC1D0: inputs: [ 1.561175] snd_hda_codec_generic hdaudioC1D1: autoconfig for Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line [ 1.561370] snd_hda_codec_generic hdaudioC1D1: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.561554] snd_hda_codec_generic hdaudioC1D1: hp_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.561738] snd_hda_codec_generic hdaudioC1D1: mono: mono_out=0x0 [ 1.561833] snd_hda_codec_generic hdaudioC1D1: dig-out=0x5/0x0 [ 1.561962] snd_hda_codec_generic hdaudioC1D1: inputs: [ 1.600184] snd_hda_codec_generic hdaudioC1D2: autoconfig for Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line [ 1.600378] snd_hda_codec_generic hdaudioC1D2: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.600563] snd_hda_codec_generic hdaudioC1D2: hp_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.600745] snd_hda_codec_generic hdaudioC1D2: mono: mono_out=0x0 [ 1.600882] snd_hda_codec_generic hdaudioC1D2: dig-out=0x5/0x0 [ 1.601018] snd_hda_codec_generic hdaudioC1D2: inputs: [ 1.638124] snd_hda_codec_generic hdaudioC1D3: autoconfig for Generic: line_outs=0 (0x0/0x0/0x0/0x0/0x0) type:line [ 1.638271] snd_hda_codec_generic hdaudioC1D3: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.638411] snd_hda_codec_generic hdaudioC1D3: hp_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 1.638551] snd_hda_codec_generic hdaudioC1D3: mono: mono_out=0x0 [ 1.638690] snd_hda_codec_generic hdaudioC1D3: dig-out=0x5/0x0 [ 1.638822] snd_hda_codec_generic hdaudioC1D3: inputs:

/proc/asound/cards which showed "--- no soundcards ---" now shows found sound cards.# cat /proc/asound/cards 0 [SB ]: HDA-Intel - HDA ATI SB HDA ATI SB at 0xfbff4000 irq 16 1 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xfe97c000 irq 19

Yes, ALSA now sees the sound cards. I checked with alsamixer and it seems to be working fine. alsamixer

When I tested with aplay, I heard a noise from my speaker! I now confirmed that the sound is working on my Gentoo.# aplay < /dev/urandom

New: Article about Pulseaudio

Follow the above link to get the sound working from VirtualBox clients.

That's all!
-gibb

Exploring with Gentoo Linux (Part 5)

Part 5 - Let's type in Japanese

To be able to type and read in Japanese, input methods and input method editor (IME) need to be installed. For IME, I choose IBM since I'm used to using it. As for input methods, I tried both ibus-anthy and ibus-mozc and I couldn't get the property dialogue for ibus-mozc up and running, so I decide to continue using ibus-anthy.

Disclaimer:
The information in this site is the result of my researches on the Internet and of my experiences. This information below is solely used for my purpose and may not be suitable for others.

Installation:

Installation of ibus as well as its dependencies and Japanese engine, ibus-anthy, is no difficult tasks. # emerge --ask app-i18n/ibus app-i18n/ibus-anthy

Configurations:

Update ~/.xinitrc and include environment variables to set for ibus.

FILE ~/.xinitrc
export XMODIFIERS=@im=ibus export GTK_IM_MODULE=ibus export QT_IM_MODULE=ibus # Use `xim` in case some apps (like Chromium) refuse to work with IBus export GTK_IM_MODULE=xim export QT_IM_MODULE=xim ibus-daemon -drx

Then, start the setup program to do some configurations.$ ibus-setup

All I changed was the keyboard shortcuts and input methods. For keyboard shortcuts, I was hoping Alt+Shift would just work, but it didn't, so I changed it to Alt+Shift+space.

For input methods, I added Japanese - Anthy to enable Japanese input. You might have noticed that its icon is different from the default one. This is because I replaced its default icon with my own.

The configuration of ibus should be done now. You'll see a small EN icon in its systray. That confirms ibus is running now. Left click on the icon will show you the list available input methods, in this case, English and Japanese - Anthy.

Changing Default Anthy Icon:

I thought the default Anthy icon was not pretty and didn't like it. So, I decided to change it to my own. After searching for the icon in the system, I found it in /usr/share/ibus-anthy/icons/. It's called ibus-anthy.png. I used GIMP to create another icon and replaced it.

That's all!
-gibb