Category: Computer

Installing Arch Linux on LVM

A good friend of mine gave me his not-needed notebook (HP Pavilion dm3-1130us) since my 10+-year-old notebook started acting up and became unstable. It got a dual-core AMD chipset with 64bit support. Good enough as a spare machine for the road.

I have been a Slackware user for a while and that's what I use on my home system and old notebook. But for this time, I wanted to try other distributions. After a quick research, I decided to go with Arch Linux. I liked its philosophy and simplicity. It seems very stable as well. That's a plus.

Don't get me wrong, I'm still a fan of slackware. I just wanted to see what else is out there.

I decided to use LVM for Arch Linux because I want to try full system encryption (dm-crypt with LUKS) later on. It seems LVM on LUKS is a growing preference nowadays.

Disclaimer:
Information below is gathered mostly from the Arch Linux Wiki page and changed here and there for my liking. This information below is solely used for my purpose and may not be suitable for others.

Configure Wireless Network:

Network connection needs to be configured before the installation can take a place. Since my notebook uses WiFi, I need to configure wireless network.

Check for the network interface and whether udev has loaded the driver. # iwconfig -------------------- eth0 no wireless extensions. lo no wireless extensions. wlan0 IEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=14 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:on

It looks like wlan0 is available.

Interface activation:

Not required for mine but here is how to activate # ip link set wlan0 up

Access point discovery:

I know my network information like ESSID, Encryption key, etc..., but here is how to list available access points # iwlist wlan0 scan | less

Or, for the new netlink interface # iw dev wlan0 scan | less

Association to the access point

Now a configuration file, /etc/wpa_supplicant.conf, needs to be created for my access point. # vi /etc/wpa_supplicant.conf -------------------- ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=wheel eapol_version=1 ap_scan=1 fast_reauth=1

These options are explained in /etc/wpa_supplicant/wpa_supplicant.conf

Append the passphrase and PSK to the file # wpa_passphrase SSID_NAME "PASSPHRASE" >> /etc/wpa_supplicant.conf

Manual connection:

The WiFi interface should be up by the earlier command ip link set wlan0 up, so now tell wpa_supplicant the driver (wext - Linux Wireless EXTensions), the SSID specified in /etc/wpa_supplicant.conf and the wireless interface. # wpa_supplicant -B -Dwext -i wlan0 -c /etc/wpa_supplicant.conf

  • -B : Run in the background
  • -D : Driver information. Default is WEXT
  • -i : Wireless interface
  • -c : Configuration file

Request an IP address to DHCP server. # dhcpcd wlan0

Check assigned IP address. # ip addr show wlan0 wlan0: mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:00:00:00:00:00: brb ff:ff:ff:ff:ff:ff inet 192.168.1.6/24 brb 192.168.1.255 scope global wlan0 inet6 fe80::ffff:ffff:ffff:ffff/64 scope link valid_lft forever preferred_lft forever

Load the module:

dm-mod needs to be loaded before doing anything with LVM # modprobe dm-mod

Partition a Disk:

# fdisk /dev/sda

Partition Layout:
/dev/sda1 -> LVM

Since I'm using GRUB2, the /boot partition is also included in the LVM partition.

Create Physical Volume:

Initialize these partitions so they can be used by LVM. # pvcreate /dev/sda3

Create Volume Groups:

Create a volume group on this physical volume. Volume group name is lvm. # vgcreate lvm /dev/sda3

Create Logical Volumes:

Create logical volumes on this new volume group. # lvcreate -L 100M -n boot lvm # lvcreate -L 10G -n root lvm # lvcreate -L 500M -n swap lvm # lvcreate -l 100%FREE -n home lvm

Configure block devices, filesystems, and mountpoints:

# mkfs.ext4 /dev/mapper/lvm-boot # mkfs.ext4 /dev/mapper/lvm-root # mkfs.ext4 /dev/mapper/lvm-home # mkswap /dev/mapper/lvm-swap # swapon /dev/mapper/lvm-swap # mount /dev/mapper/lvm-root /mnt # mkdir /mnt/boot # mount /dev/mapper/lvm-boot /mnt/boot # mkdir /mnt/home # mount /dev/mapper/lvm-home /mnt/home

If there are no logical volumes under /dev/mapper, run next commands to bring up the modules and to make volume group available: # modprobe dm-mod # vgscan # vgchange -ay

  • vgscan: Scans all disks for volume groups and re-builds caches
  • vgchange -ay: Makes the logical volumes known to the kernel

Select installation mirror:

Before installing, you may want to edit /etc/pacman.d/mirrorlist such that your preferred mirror is first. This copy of the mirrorlist will be installed on your new system by pacstrap as well, so it's worth getting it right.

Install the base system and other package groups:

The base system is installed using the pacstrap script. pacstrap is a script that installs packages to the specified new root directory. If no packages are given, pacstrap defaults to the "base" group.

Required X Window Systems packages for openbox will be installed in post-installation configuration

The system uses wireless network, so install the required wireless network packages. # pacstrap /mnt base base-devel wireless_tools netcfg wpa_supplicant wpa_actiond

Generate an fstab file

The fstab file contains static filesystem information. It defines how storage devices and partitions are to be mounted and integrated into the overall system. It is read by the mount command to determine which options to use when mounting a specific device or partition.

Most likely swap partition will have wrong filesystem name, so this needs to be changed. # genfstab -p /mnt >> /mnt/etc/fstab # vi /mnt/etc/fstab -------------------- ... /dev/mapper/lvm-swap none swap defaults 0 0

Chroot into the system

# arch-chroot /mnt

Configuring the System

Let's configure the primary configuration files

/etc/rc.conf is the configuration file for Arch's initscripts. Some of options in this file has been obsolete and they now have own configuration files (ex: hostname, etc...). /etc/rc.conf still configures daemons to start during boot-up and some networking and storage information.

Editing /etc/rc.conf:

Since LVM is used on this system, I need to enable it so that the kernel knows about it # vi /etc/rc.conf -------------------- USELVM="yes"

Hostname:

Configuring hostname requires updating two files, /etc/hostname and /etc/hosts

Add hostname in /etc/hostname # cat > /etc/hostsname arch64 ^D

Add hostname in /etc/hosts # vi /etc/hosts -------------------- 127.0.0.1 localhost.localdomain localhost arch64 ::1 localhost.localdomain localhost arch64

Console fonts and keymap:

The console, meaning a terminal running with no X Window System, uses the ASCII character set as the default.

A console font is limited to either 256 or 512 characters. The fonts are found in /usr/share/kbd/consolefonts/.

Keymaps, the connection between the key pressed and the character used by the computer, are found in the subdirectories of /usr/share/kbd/keymaps/ # cat > /etc/vconsole.conf KEYMAP=us FONT= FONT_MAP= ^D

  • KEYMAP - the default (us) is ok
  • FONT - the default (blank) is ok
  • FONT_MAP - the default (blank) is ok

Timezone:

Available time zones and subzones can be found in the /usr/share/zoneinfo/<Zone>/<SubZone> directories.

Create a symlink /etc/localtime to zone file # ln -s /usr/share/zoneinfo/US/Eastern /etc/localtime

Locale:

Choose the locale(s) from /etc/locale.gen and uncomment them. # vi /etc/locale.gen -------------------- en_US.UTF-8 UTF-8 -------------------- # locale-gen

Setting up system-wide locale:

# cat > /etc/locale.conf LANG=en_US.UTF-8 LC_TIME=en_US.UTF-8 ^D

Set the LANG variable for the ramdisk creation # export LANG=en_US.UTF-8

Hardware clock time:

It's recommended to use UTC. # hwclock --systohc --utc

Configuring wireless network:

Copy wireless-wpa from /etc/network.d/examples/ to /etc/network.d and rename it something else. This will be a template for my profile. Open it and change ESSID to my SSID name. Delete everything below ESSID. The KEY value needs to be a hex string so it'll be generated by using the wpa_passphrase command: # wpa_passphrase SSID_NAME "PASSPHRASE" >> /etc/network.d/[profile_name]

Open the profile and delete the lines starting with network={, ssid=, #psk=, and }, leaving only the psk line. Then change this psk to KEY, and add IP='dhcp' to the bottom of the line: cat /etc/network.d/[profile_name] -------------------- CONNECTION='wireless' DESCRIPTION='WPA encrypted wireless connection' INTERFACE='wlan0' SECURITY='wpa' ESSID=[SSID_name] KEY=[hex_string_for_passphrase] IP='dhcp'

Now, connect to the profile: # netcfg [profile_name]

If no errors, it should display :: [profile_name] up

Configure the rc.conf file for auto connecting to the wireless network after each reboot: vi /etc/rc.conf -------------------- DAEMONS=(... net-auto-wireless ...)

Make sure /etc/conf.d/netcfg has the following values: cat /etc/conf.d/netcfg -------------------- NETWORKS=(last) WIRELESS_INTERFACE="wlan0"

Create an initial ramdisk environment:

Configure /etc/mkinitcpio.conf for LVM by adding lvm2 in the HOOKS section before filesystems so that the kernel will find LVM volumes at boot time. # vi /etc/mkinitcpio.conf -------------------- HOOKS="...lvm2 filesystems..."

Now generate the kernel image. # cd /boot # mkinitcpio -p linux

Install and configure a bootloader:

# pacman -S grub-bios # grub-install --target=i386-pc --recheck /dev/sda

Create a grub configuration file. # grub-mkconfig -o /boot/grub/grub.cfg

Root password:

Set the root password now # passwd

Unmount the partitions and reboot:

Exit from the chroot environment. # exit

Since the partitions are mounted under /mnt, unmount them. # umount /mnt/{boot,home,}

Exit the install and reboot. # reboot

Post-Installation

Updating the system:

Sync, refresh, and upgrade the entire new system. # pacman -Syu (or pacman --sync --refresh --sysupgrade)

Pacman will now download a fresh copy of the master package list from the server(s) defined in /etc/pacman.conf and perform all available upgrades.

Pacman output is saved in /var/log/pacman.log

Adding a user:

Now add a normal user account for daily tasks # useradd -m -g users -G audio,games,log,lp,optical,power,scanner,storage,video,wheel -s /bin/bash ubyt3m3

Set a password for ubyt3m3 # passwd ubyt3m3

X Window System:

The X Window System (commonly X11, or X) is a networking and display protocol which provides windowing on bitmap displays. It provides the standard toolkit and protocol to build graphical user interfaces (GUIs).

Now install the base Xorg packages using pacman. # pacman -S xorg-server xorg-xinit xorg-server-utils

Install video driver:

My system came with ATI Graphics Card, so install the open source raden driver. # pacman -S xf86-video-ati

Install input driver:

Since this install is for notebook, following package is needed for touchpad. # pacman -S xf86-input-synaptics

Testing X:

Install the default environment. # pacman -S xorg-twm xorg-xclock xterm

Fonts

Install a set of TrueType fonts, as only unscalable bitmap fonts are included by default. DejaVu is a set of high quality. # pacman -S ttf-dejavu

That's the very base system. Installation and configuration of other software will be in another time.

That's all!
-gibb

Linux: cdrecord command

Back in days, I used to use the k3b application to burn CD/DVD. I liked the program a lot, but after I started using Xfce as my DE, it started failing in various occasions. Then I tried xfburn. It's a light-weight, good program, but for some reasons, it didn't stick to me. After much of searching for alternative program for burning CD/DVD or creating ISO images, I came across to the cdrecord command. It was natural for me to like this little utility, after all, k3b calls it to burn them. Also, I use openbox as a stand-alone WM, it works perfect for me.

I don't do a complicated stuff with it; just making DVDs or burning from ISO images.

First, let's scan SCSI bus to determine the device description: cdrecord -scanbus Cdrecord-ProDVD-ProBD-Clone 3.01a02 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2010 Joerg Schilling Linux sg driver version: 3.5.34 Using libscg version 'schily-0.9'. ... scsibus2: 2,0,0 200) 'hp ' 'BDDVDRW CH20L ' 'BC33' Removable CD-ROM 2,1,0 201) * 2,2,0 202) * 2,3,0 203) * 2,4,0 204) * 2,5,0 205) * 2,6,0 206) * 2,7,0 207) * ...

On my system, my DVD burner is attached to "2,0,0".

Burning ISO images onto disc:

cdrecord dev="2,0,0" speed=16 -v -eject path_to_ISO_image.iso

Blanking CD/DVD-RW:

cdrecord dev="2,0,0" speed=16 -v -eject blank=fast

"fast" option - Data is not overwritten.

cdrecord dev="2,0,0" speed=16 -v -eject blank=all

"all" option - Data is overwritten and entire media is erased.

That's all!
-gibb

Disclaimer:
Information in this page is the result of my researches in the Internet and of my experiences. It is solely used for my purpose and may not be suitable for others.

WordPress Plugin: WP-No-Format

Being a WordPress (and Blogging) newbie, I have been trying to find a way to customize the representation of my posts for a few days. With a bit of ‘Googling’, I found about Child Themes.

Great! This helps me further customize my pages and my change/update won’t be affected by theme update. However, when I tried to ‘preserve’ the white-spaces with white-space:pre in CSS, this created extra empty lines:
With 'white-space:pre':
3 Spaces in front of this line.
This line should be right below above statement.

See, there is an extra line between statements. This is because the WordPress Editor inserts <br/> for each new line, plus, I think, ‘pre’ option specified in the ‘white-space’ property also preserves new lines. This creates extra space (If I’m wrong here, please point out!)

Now, how do we easily overcome this…?

Install WP-No-Format WordPress plug-in!

This plugin lets you prevent WordPress from modifying the HTML written code.

It’s very easy to use. All you need to do is to wrap the text which you want to protect with <!– noformat on –> and <!– noformat off –>.

<!-- noformat on --> With 'white-space:pre': 3 spaces in front of this line. This line should be right below above statement. <!-- noformat off -->

This example above will produce this:

With 'white-space:pre': 3 Spaces in front of this line. This line should be right below above statement.

That’s more I like it.

That’s all!
-gibb

Slackware64: Name-Based Web Sites on a Single IP Address (vhosts)

Configuring VirtualHost with Slackware64 13.37 is also relatively easy. This is my local setup.

Uncomment below from /etc/httpd/httpd.conf. This enables virtual host. Include /etc/httpd/extra/httpd-vhosts.conf

Edit /etc/httpd/extra/httpd-vhosts.conf

Note on access control. From Apache version 2.4, Options, Allow, and other directives are replaced by the Require directive. Neglecting to make this change could result in 403 Forbidden You don't have permission to access / on this server. or AH01630: client denied by server configuration... in the error log.

For more detailed information, upgrading overview document is useful. NameVirtualHost *:80 <virtualhost *:80> <directory "/home/ubyt3m3/www/siteA"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all Require all granted [Edit: To comply with Apache 2.4] </directory> ServerName siteA DocumentRoot "/home/ubyt3m3/www/siteA" ErrorLog "/var/log/httpd/siteA.err" CustomLog "/var/log/httpd/siteA.log" common </virtualhost> <virtualhost *:80> <directory "/home/ubyt3m3/www/siteB"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all Require all granted [Edit: To comply with Apache 2.4] </directory> ServerName siteB DocumentRoot "/home/ubyt3m3/www/siteB" ErrorLog "/var/log/httpd/siteB.err" CustomLog "/var/log/httpd/siteB.log" common </virtualhost>

Edit /etc/hosts so that the sites can be found by name: 127.0.0.1 siteA siteB

Restart the httpd process: /etc/rc.d/rc.httpd stop /etc/rc.d/rc.httpd start

That's all!
-gibb

Disclaimer:
Information in this page is the result of my researches in the Internet and of my experiences. It is solely used for my purpose and may not be suitable for others.

Apache MySQL PHP on Slackware

LAMP (Linux Apache Mysql Php) configuration with Slackware64 13.37. With full Slackware install, required software should be all installed, so it's just a matter of configuring and activating them.

If they are not installed, run below commands: slackpkg install httpd slackpkg install mysql

Apache2

Apache (httpd) is the web server software. It's configuration files are in /etc/httpd/. Edit the main configuration file, httpd.conf vim /etc/httpd/httpd.conf

After editing the file, check its syntax apachectl -t

With no error, it returns "Syntax OK".

To start the httpd server and to be sure it starts each time at boot, make the /etc/rc.d/rc.httpd file as executable and start it with the following commands: chmod 0744 /etc/rc.d/rc.httpd /etc/rc.d/rc.httpd start

The server started message should be displayed.

Open a web browser and point it at "http://localhost/". It should say "It Works!"

Apache2 and PHP

Open /etc/httpd/httpd.conf and look for the following section: DirectoryIndex index.html

Change it to something like this: DirectoryIndex index.php index.html index

Next uncomment tne following line to enable/include mod_php.conf: Include /etc/httpd/mod_php.conf

Save the file.

Open /etc/httpd/mod_php.conf and add the following in the file: AddType application/x-httpd-php .php .php3 .php4 .php5

Save the file and restart the httpd server. /etc/rc.d/rc.httpd restart

To test that php is functioning correctly, create index.php with the following line in it: cd /srv/httpd/htdocs cat > index.php <?php phpinfo(); ?> ^D

Open up a web browser and point it to "http://localhost/index.php" It should display detailed information from phpinfo().

Once confirmed, it's a good idea to delete phpinfo() from the file for security reasons.

MySQL

There are a few different configuration files for MySQL in /etc/

  • /etc/my-huge.cnf
  • /etc/my-medium.cnf
  • /etc/my-small.cnf

For my environment, my-small.cnf is good enough, so copy it to /etc/my.cnf cp /etc/my-small.cnf /etc/my.cnf

Execute the following commands in this order: chmod 0755 /etc/rc.d/rc.mysqld mysql_install_db --user=mysql chown -R mysql:mysql /var/lib/mysql /etc/rc.d/rc.mysqld start mysql_secure_installation

That's all!
-gibb

Disclaimer:
Information in this page is the result of my researches in the Internet and of my experiences. It is solely used for my purpose and may not be suitable for others.