[1] http://en.wikipedia.org/wiki/LogFS
[2] http://en.wikipedia.org/wiki/JFFS2
[3] http://en.wikipedia.org/wiki/YAFFS
[4] http://en.wikipedia.org/wiki/Flash_file_system
[5] http://www.linux-mtd.infradead.org/faq/jffs2.html#L_bbhandle ----jffs2 trouble shotting
LOGFS IS THE FUTURE FOR BIGGER FLASH [1]
----------------------------------------
LogFS is a Linux log-structured and scalable flash filesystem, intended for use on large devices of flash memory. It is written by Jörn Engel and in part sponsored by the CE Linux Forum.
LogFS is included in the mainline Linux kernel and was introduced in version 2.6.34, released on May 16, 2010.
DISADVANTAGE OF JFFS2 [2]
-------------------------------
Disadvantages
All nodes must still be scanned at mount time. This is slow and is becoming an increasingly serious problem as flash devices scale upward into the Gigabyte range.
Writing many small blocks of data can even lead to negative compression rates, so it is essential for applications to use large write buffers.
There is no practical way to tell how much usable free space is left on a device since this depends both on how well additional data can be compressed, and the writing sequence.
Wednesday, June 29, 2011
Tuesday, June 28, 2011
Check package version under Ubuntu
[1] http://www.howtogeek.com/howto/ubuntu/see-what-version-of-a-package-is-installed-on-ubuntu/
quentin@ubuntu:/var/lib/tftpboot$ dpkg -s mtd-utils
Package: mtd-utils
Status: install ok installed
Priority: extra
Section: utils
Installed-Size: 1160
Maintainer: Ubuntu Developers
Architecture: i386
Version: 20100706-1
Replaces: mtd-tools
Provides: mtd-tools
Depends: libc6 (>= 2.8), liblzo2-2, libuuid1 (>= 2.16), zlib1g (>= 1:1.1.4)
Description: Memory Technology Device Utilities
Utilities for manipulating memory technology devices, such as flash
memory, Disk-On-Chip, or ROM. Includes mkfs.jffs2, a tool to create
JFFS2 (journaling flash file system) filesystems.
Original-Maintainer: Riku Voipio
Homepage: http://www.linux-mtd.infradead.org/
quentin@ubuntu:/var/lib/tftpboot$ dpkg -s mtd-utils
Package: mtd-utils
Status: install ok installed
Priority: extra
Section: utils
Installed-Size: 1160
Maintainer: Ubuntu Developers
Architecture: i386
Version: 20100706-1
Replaces: mtd-tools
Provides: mtd-tools
Depends: libc6 (>= 2.8), liblzo2-2, libuuid1 (>= 2.16), zlib1g (>= 1:1.1.4)
Description: Memory Technology Device Utilities
Utilities for manipulating memory technology devices, such as flash
memory, Disk-On-Chip, or ROM. Includes mkfs.jffs2, a tool to create
JFFS2 (journaling flash file system) filesystems.
Original-Maintainer: Riku Voipio
Homepage: http://www.linux-mtd.infradead.org/
Monday, June 20, 2011
VNC Server set up in UBUNTU
[1] http://theseekersquill.wordpress.com/2010/03/16/vnc-server-ubuntu-windows/ ---Best Link
[2] http://nuclear-imaging.info/site_content/2010/04/19/vnc-server-setup-for-ubuntu-10-04-lucid-lynx/
[3] http://usingnix.wordpress.com/2010/12/15/setup-vnc-in-ubuntu-10-10/
[4] http://blog.sudobits.com/2011/03/13/vnc-server-for-ubuntu-10-10/
[5] http://ubuntuforums.org/showthread.php?t=1313898 ---- Get rid of warning for auto start
[6] http://www.debianhelp.co.uk/vnc.htm
[7] http://askubuntu.com/questions/390113/x11vnc-much-slower-than-xvnc-how-to-get-a-xubuntu-session-manually
[8] https://freevps.us/thread-14110.html
[9] https://help.ubuntu.com/community/VNC/Servers
[10] https://wiki.archlinux.org/index.php/TigerVNC
[11] http://askubuntu.com/questions/603169/lubuntu-14-04-tightvnc-remote-mouse-cursor-is-x
[12] vnc/xrdp to xfce4 windows manager good posts
[13] Using ubuntu 14.04.3 default vino desktop sharing (current session)
[14] One bug fix in early 14.04 vino
qyang@lubuntu-laptop:~$ apt-cache search autocutsel
autocutsel - Keep the X clipboard and the cutbuffer in sync
Got tightvnc work on lubuntu after changing xstartup file
x11vnc is slower. [7] [8] tightvncserver is suggested and faster. [8] vnc4server was discussed a lot.
x11vnc is different from xvnc(tightvnc, tigervnc). The latter support multiple sessions. Also, seems x11vnc is slower than xvnc.[7]
x11vnc offers better security focus ( can be secured with SSH or SSL.) but it's known to be slower. [8]
vino and x11vnc in Ubuntu [9]
VNC SET UP AND SSH SERVER SET UP
-----------------------------------
INSTALL OPENSSH SERVER AND VNC SERVER
----------------------------------------
quentin@QuentinUbuntu:~$ sudo apt-get install openssh-server openssh-client vnc4server xinetd vncviewer
[sudo] password for quentin:
Sorry, try again.
[sudo] password for quentin:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'xtightvncviewer' instead of 'vncviewer'
The following extra packages will be installed:
xbase-clients xtightvncviewer
Suggested packages:
libpam-ssh keychain openssh-blacklist openssh-blacklist-extra rssh
molly-guard vnc-java tightvncserver
The following NEW packages will be installed:
openssh-server vnc4server xbase-clients xinetd xtightvncviewer
The following packages will be upgraded:
openssh-client
1 upgraded, 5 newly installed, 0 to remove and 328 not upgraded.
Need to get 3,305kB of archives.
After this operation, 6,484kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
....................
.............
SSH SERVER SET UP
--------------------------------------------
quentin@QuentinUbuntu:~$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/quentin/.ssh/id_rsa):
Created directory '/home/quentin/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/quentin/.ssh/id_rsa.
Your public key has been saved in /home/quentin/.ssh/id_rsa.pub.
The key fingerprint is:
9f:71:93:c0:80:9f:aa:e5:a9:ec:e1:0c:d2:9a:a3:13 quentin@QuentinUbuntu
The key's randomart image is:
+--[ RSA 2048]----+
| .. |
| . o |
| . .o |
| o . . |
| .S . + |
|E. o . + . |
|..o .+ . o |
|o+ =..o |
|=o .*. |
+-----------------+
SET UP VNC SERVER PASSWORD
--------------------------------------
qyang@lubuntu-laptop:~$ vncpasswd
Using password file /home/qyang/.vnc/passwd
VNC directory /home/qyang/.vnc does not exist, creating.
Password:
Verify:
Would you like to enter a view-only password (y/n)? y
Password:
Verify:
START VNC SERVER
-----------------------------
quentin@QuentinUbuntu:~$ vnc4server
New 'QuentinUbuntu:1 (quentin)' desktop is QuentinUbuntu:1
Creating default startup script /home/quentin/.vnc/xstartup
Starting applications specified in /home/quentin/.vnc/xstartup
Log file is /home/quentin/.vnc/QuentinUbuntu:1.log
quentin@QuentinUbuntu:~$ ps aux |grep vnc
quentin 1898 0.1 0.3 10504 5284 pts/0 S 19:07 0:00 Xvnc4 :1 -desktop QuentinUbuntu:1 (quentin) -auth /var/run/gdm/auth-for-quentin-5eao3N/database -geometry 1024x768 -depth 16 -rfbwait 30000 -rfbauth /home/quentin/.vnc/passwd -rfbport 5901 -pn -fp /usr/X11R6/lib/X11/fonts/Type1/,/usr/X11R6/lib/X11/fonts/Speedo/,/usr/X11R6/lib/X11/fonts/misc/,/usr/X11R6/lib/X11/fonts/75dpi/,/usr/X11R6/lib/X11/fonts/100dpi/,/usr/share/fonts/X11/misc/,/usr/share/fonts/X11/Type1/,/usr/share/fonts/X11/75dpi/,/usr/share/fonts/X11/100dpi/ -co /etc/X11/rgb
quentin 1904 0.0 0.0 4596 1540 pts/0 S 19:07 0:00 vncconfig -iconic
quentin 1936 0.0 0.0 4008 748 pts/0 S+ 19:09 0:00 grep --color=auto vnc
KILL VNCSERVER
------------------------
quentin@QuentinUbuntu:~$ vncserver -kill :1
Killing Xvnc4 process ID 3561
LOCAL VNC ACCESS
-----------------------
quentin@QuentinUbuntu:~$vncviewer localhost:1
SSH SERVER LOG IN VIA PUTTY
-------------------------------
quentin@10.1.1.5's password:
Linux QuentinUbuntu 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux
Ubuntu 10.10
Welcome to Ubuntu!
* Documentation: https://help.ubuntu.com/
Your CPU appears to be lacking expected security protections.
Please check your BIOS settings, or for more information, run:
/usr/bin/check-bios-nx --verbose
336 packages can be updated.
157 updates are security updates.
New release 'natty' available.
Run 'do-release-upgrade' to upgrade to it.
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
EDIT VNC XSTARTUP FILE TO REMOVE GREY BACKGROUND
------------------------------------------------
quentin@QuentinUbuntu:~$ vi /home/quentin/.vnc/xstartup
#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
#exec /etc/X11/xinit/xinitrc
sh /etc/X11/xinit/xinitrc
#[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
#[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
#xsetroot -solid grey
#vncconfig -iconic &
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
#gnome-session &
#twm &
START VNC SERVER AGAIN
----------------------------------
quentin@QuentinUbuntu:~$ vncserver
xauth: creating new authority file /home/quentin/.Xauthority
New 'QuentinUbuntu:1 (quentin)' desktop is QuentinUbuntu:1
Starting applications specified in /home/quentin/.vnc/xstartup
Log file is /home/quentin/.vnc/QuentinUbuntu:1.log
MAKE VNC SERVER AUTO RUN WHEN BOOT
------------------------------------
$sudo -i
root@QuentinUbuntu:~# vi /etc/init.d/vncserver
#!/bin/sh -e
### BEGIN INIT INFO
# Provides: vncserver
# Required-Start: networking
# Default-Start: S
# Default-Stop: 0 6
### END INIT INFO
PATH="$PATH:/usr/X11R6/bin/"
# The Username:Group that will run VNC
export USER="quentin"
#${RUNAS}
# The display that VNC will use
DISPLAY="1"
# Color depth (between 8 and 32)
DEPTH="16"
# The Desktop geometry to use.
#GEOMETRY="x"
#GEOMETRY="800x600"
GEOMETRY="1024x768"
#GEOMETRY="1280x1024"
# The name that the VNC Desktop will have.
NAME="QuentinUbuntu-vnc-server"
OPTIONS="-name ${NAME} -depth ${DEPTH} -geometry ${GEOMETRY} :${DISPLAY}"
. /lib/lsb/init-functions
case "$1" in
start)
su ${USER} -c "/usr/bin/vncserver ${OPTIONS}"
;;
stop)
su ${USER} -c "/usr/bin/vncserver -kill :${DISPLAY}"
;;
restart)
$0 stop
$0 start
;;
esac
exit 0
root@QuentinUbuntu:~# chmod +x /etc/init.d/vncserver
MAKE IT AUTO RUN WHEN BOOT
-----------------------------------
sudo update-rc.d vncserver defaults
update-rc.d: warning: /etc/init.d/vncserver missing LSB keyword 'required-stop'
update-rc.d: warning: vncserver start runlevel arguments (2 3 4 5) do not match LSB Default-Start values (S)
update-rc.d: warning: vncserver stop runlevel arguments (0 1 6) do not match LSB Default-Stop values (0 6)
Adding system startup for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver -> ../init.d/vncserver
/etc/rc1.d/K20vncserver -> ../init.d/vncserver
/etc/rc6.d/K20vncserver -> ../init.d/vncserver
/etc/rc2.d/S20vncserver -> ../init.d/vncserver
/etc/rc3.d/S20vncserver -> ../init.d/vncserver
/etc/rc4.d/S20vncserver -> ../init.d/vncserver
/etc/rc5.d/S20vncserver -> ../init.d/vncserver
To get rid of warning
we change the /etc/init.d/vncserver
### BEGIN INIT INFO
# Provides: vncserver
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start daemon at boot time
# Description: Enable service provided by daemon.
### END INIT INFO
quentin@QuentinUbuntu:~$ sudo update-rc.d -f vncserver remove
Removing any system startup links for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver
/etc/rc1.d/K20vncserver
/etc/rc2.d/S20vncserver
/etc/rc3.d/S20vncserver
/etc/rc4.d/S20vncserver
/etc/rc5.d/S20vncserver
/etc/rc6.d/K20vncserver
NO MORE WARNINGS
--------------------------------
quentin@QuentinUbuntu:~$ sudo update-rc.d vncserver defaults
Adding system startup for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver -> ../init.d/vncserver
/etc/rc1.d/K20vncserver -> ../init.d/vncserver
/etc/rc6.d/K20vncserver -> ../init.d/vncserver
/etc/rc2.d/S20vncserver -> ../init.d/vncserver
/etc/rc3.d/S20vncserver -> ../init.d/vncserver
/etc/rc4.d/S20vncserver -> ../init.d/vncserver
/etc/rc5.d/S20vncserver -> ../init.d/vncserver
[2] http://nuclear-imaging.info/site_content/2010/04/19/vnc-server-setup-for-ubuntu-10-04-lucid-lynx/
[3] http://usingnix.wordpress.com/2010/12/15/setup-vnc-in-ubuntu-10-10/
[4] http://blog.sudobits.com/2011/03/13/vnc-server-for-ubuntu-10-10/
[5] http://ubuntuforums.org/showthread.php?t=1313898 ---- Get rid of warning for auto start
[6] http://www.debianhelp.co.uk/vnc.htm
[7] http://askubuntu.com/questions/390113/x11vnc-much-slower-than-xvnc-how-to-get-a-xubuntu-session-manually
[8] https://freevps.us/thread-14110.html
[9] https://help.ubuntu.com/community/VNC/Servers
[10] https://wiki.archlinux.org/index.php/TigerVNC
[11] http://askubuntu.com/questions/603169/lubuntu-14-04-tightvnc-remote-mouse-cursor-is-x
[12] vnc/xrdp to xfce4 windows manager good posts
[13] Using ubuntu 14.04.3 default vino desktop sharing (current session)
[14] One bug fix in early 14.04 vino
qyang@lubuntu-laptop:~$ apt-cache search autocutsel
autocutsel - Keep the X clipboard and the cutbuffer in sync
Got tightvnc work on lubuntu after changing xstartup file
./vnc/xstartup file is configured as follows [11] :#!/bin/sh
xrdb $HOME/.Xresources
xsetroot -solid grey -cursor_name left_ptr
autocutsel -fork
lxsession -s Lubuntu -e LXDE
x11vnc is slower. [7] [8] tightvncserver is suggested and faster. [8] vnc4server was discussed a lot.
x11vnc is different from xvnc(tightvnc, tigervnc). The latter support multiple sessions. Also, seems x11vnc is slower than xvnc.[7]
x11vnc offers better security focus ( can be secured with SSH or SSL.) but it's known to be slower. [8]
vino and x11vnc in Ubuntu [9]
VNC SET UP AND SSH SERVER SET UP
-----------------------------------
INSTALL OPENSSH SERVER AND VNC SERVER
----------------------------------------
quentin@QuentinUbuntu:~$ sudo apt-get install openssh-server openssh-client vnc4server xinetd vncviewer
[sudo] password for quentin:
Sorry, try again.
[sudo] password for quentin:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'xtightvncviewer' instead of 'vncviewer'
The following extra packages will be installed:
xbase-clients xtightvncviewer
Suggested packages:
libpam-ssh keychain openssh-blacklist openssh-blacklist-extra rssh
molly-guard vnc-java tightvncserver
The following NEW packages will be installed:
openssh-server vnc4server xbase-clients xinetd xtightvncviewer
The following packages will be upgraded:
openssh-client
1 upgraded, 5 newly installed, 0 to remove and 328 not upgraded.
Need to get 3,305kB of archives.
After this operation, 6,484kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
....................
.............
SSH SERVER SET UP
--------------------------------------------
quentin@QuentinUbuntu:~$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/quentin/.ssh/id_rsa):
Created directory '/home/quentin/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/quentin/.ssh/id_rsa.
Your public key has been saved in /home/quentin/.ssh/id_rsa.pub.
The key fingerprint is:
9f:71:93:c0:80:9f:aa:e5:a9:ec:e1:0c:d2:9a:a3:13 quentin@QuentinUbuntu
The key's randomart image is:
+--[ RSA 2048]----+
| .. |
| . o |
| . .o |
| o . . |
| .S . + |
|E. o . + . |
|..o .+ . o |
|o+ =..o |
|=o .*. |
+-----------------+
SET UP VNC SERVER PASSWORD
--------------------------------------
qyang@lubuntu-laptop:~$ vncpasswd
Using password file /home/qyang/.vnc/passwd
VNC directory /home/qyang/.vnc does not exist, creating.
Password:
Verify:
Would you like to enter a view-only password (y/n)? y
Password:
Verify:
START VNC SERVER
-----------------------------
quentin@QuentinUbuntu:~$ vnc4server
New 'QuentinUbuntu:1 (quentin)' desktop is QuentinUbuntu:1
Creating default startup script /home/quentin/.vnc/xstartup
Starting applications specified in /home/quentin/.vnc/xstartup
Log file is /home/quentin/.vnc/QuentinUbuntu:1.log
quentin@QuentinUbuntu:~$ ps aux |grep vnc
quentin 1898 0.1 0.3 10504 5284 pts/0 S 19:07 0:00 Xvnc4 :1 -desktop QuentinUbuntu:1 (quentin) -auth /var/run/gdm/auth-for-quentin-5eao3N/database -geometry 1024x768 -depth 16 -rfbwait 30000 -rfbauth /home/quentin/.vnc/passwd -rfbport 5901 -pn -fp /usr/X11R6/lib/X11/fonts/Type1/,/usr/X11R6/lib/X11/fonts/Speedo/,/usr/X11R6/lib/X11/fonts/misc/,/usr/X11R6/lib/X11/fonts/75dpi/,/usr/X11R6/lib/X11/fonts/100dpi/,/usr/share/fonts/X11/misc/,/usr/share/fonts/X11/Type1/,/usr/share/fonts/X11/75dpi/,/usr/share/fonts/X11/100dpi/ -co /etc/X11/rgb
quentin 1904 0.0 0.0 4596 1540 pts/0 S 19:07 0:00 vncconfig -iconic
quentin 1936 0.0 0.0 4008 748 pts/0 S+ 19:09 0:00 grep --color=auto vnc
KILL VNCSERVER
------------------------
quentin@QuentinUbuntu:~$ vncserver -kill :1
Killing Xvnc4 process ID 3561
LOCAL VNC ACCESS
-----------------------
quentin@QuentinUbuntu:~$vncviewer localhost:1
SSH SERVER LOG IN VIA PUTTY
-------------------------------
quentin@10.1.1.5's password:
Linux QuentinUbuntu 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux
Ubuntu 10.10
Welcome to Ubuntu!
* Documentation: https://help.ubuntu.com/
Your CPU appears to be lacking expected security protections.
Please check your BIOS settings, or for more information, run:
/usr/bin/check-bios-nx --verbose
336 packages can be updated.
157 updates are security updates.
New release 'natty' available.
Run 'do-release-upgrade' to upgrade to it.
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
EDIT VNC XSTARTUP FILE TO REMOVE GREY BACKGROUND
------------------------------------------------
quentin@QuentinUbuntu:~$ vi /home/quentin/.vnc/xstartup
#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
#exec /etc/X11/xinit/xinitrc
sh /etc/X11/xinit/xinitrc
#[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
#[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
#xsetroot -solid grey
#vncconfig -iconic &
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
#gnome-session &
#twm &
START VNC SERVER AGAIN
----------------------------------
quentin@QuentinUbuntu:~$ vncserver
xauth: creating new authority file /home/quentin/.Xauthority
New 'QuentinUbuntu:1 (quentin)' desktop is QuentinUbuntu:1
Starting applications specified in /home/quentin/.vnc/xstartup
Log file is /home/quentin/.vnc/QuentinUbuntu:1.log
MAKE VNC SERVER AUTO RUN WHEN BOOT
------------------------------------
$sudo -i
root@QuentinUbuntu:~# vi /etc/init.d/vncserver
#!/bin/sh -e
### BEGIN INIT INFO
# Provides: vncserver
# Required-Start: networking
# Default-Start: S
# Default-Stop: 0 6
### END INIT INFO
PATH="$PATH:/usr/X11R6/bin/"
# The Username:Group that will run VNC
export USER="quentin"
#${RUNAS}
# The display that VNC will use
DISPLAY="1"
# Color depth (between 8 and 32)
DEPTH="16"
# The Desktop geometry to use.
#GEOMETRY="
#GEOMETRY="800x600"
GEOMETRY="1024x768"
#GEOMETRY="1280x1024"
# The name that the VNC Desktop will have.
NAME="QuentinUbuntu-vnc-server"
OPTIONS="-name ${NAME} -depth ${DEPTH} -geometry ${GEOMETRY} :${DISPLAY}"
. /lib/lsb/init-functions
case "$1" in
start)
su ${USER} -c "/usr/bin/vncserver ${OPTIONS}"
;;
stop)
su ${USER} -c "/usr/bin/vncserver -kill :${DISPLAY}"
;;
restart)
$0 stop
$0 start
;;
esac
exit 0
root@QuentinUbuntu:~# chmod +x /etc/init.d/vncserver
MAKE IT AUTO RUN WHEN BOOT
-----------------------------------
sudo update-rc.d vncserver defaults
update-rc.d: warning: /etc/init.d/vncserver missing LSB keyword 'required-stop'
update-rc.d: warning: vncserver start runlevel arguments (2 3 4 5) do not match LSB Default-Start values (S)
update-rc.d: warning: vncserver stop runlevel arguments (0 1 6) do not match LSB Default-Stop values (0 6)
Adding system startup for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver -> ../init.d/vncserver
/etc/rc1.d/K20vncserver -> ../init.d/vncserver
/etc/rc6.d/K20vncserver -> ../init.d/vncserver
/etc/rc2.d/S20vncserver -> ../init.d/vncserver
/etc/rc3.d/S20vncserver -> ../init.d/vncserver
/etc/rc4.d/S20vncserver -> ../init.d/vncserver
/etc/rc5.d/S20vncserver -> ../init.d/vncserver
To get rid of warning
we change the /etc/init.d/vncserver
### BEGIN INIT INFO
# Provides: vncserver
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start daemon at boot time
# Description: Enable service provided by daemon.
### END INIT INFO
quentin@QuentinUbuntu:~$ sudo update-rc.d -f vncserver remove
Removing any system startup links for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver
/etc/rc1.d/K20vncserver
/etc/rc2.d/S20vncserver
/etc/rc3.d/S20vncserver
/etc/rc4.d/S20vncserver
/etc/rc5.d/S20vncserver
/etc/rc6.d/K20vncserver
NO MORE WARNINGS
--------------------------------
quentin@QuentinUbuntu:~$ sudo update-rc.d vncserver defaults
Adding system startup for /etc/init.d/vncserver ...
/etc/rc0.d/K20vncserver -> ../init.d/vncserver
/etc/rc1.d/K20vncserver -> ../init.d/vncserver
/etc/rc6.d/K20vncserver -> ../init.d/vncserver
/etc/rc2.d/S20vncserver -> ../init.d/vncserver
/etc/rc3.d/S20vncserver -> ../init.d/vncserver
/etc/rc4.d/S20vncserver -> ../init.d/vncserver
/etc/rc5.d/S20vncserver -> ../init.d/vncserver
Thursday, June 9, 2011
Sunday, May 29, 2011
Network setting under Linux ---Embedded Linux Internet Access
[1] http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch03_:_Linux_Networking
[root@GsnCommsModule rc.d]# ifconfig -a
[root@GsnCommsModule rc.d]# cat rc.conf
all_services="mount-proc-sys mdev udev hostname devfsd depmod modules filesystems syslog network inetd portmap dropbear sshd boa smb dhcpd settime qtopia watchdog gtk2 pango"
all_services_r="pango gtk2 watchdog qtopia settime dhcpd smb boa sshd dropbear portmap inetd network syslog filesystems modules depmod devfsd hostname udev mdev mount-proc-sys"
cfg_services="mount-proc-sys mdev hostname depmod modules filesystems syslog network sshd settime "
cfg_services_r=" settime sshd network syslog filesystems modules depmod hostname mdev mount-proc-sys"
export HOSTNAME="GsnCommsModule [-m] [options....]"
export NTP_SERVER="ntp.cs.strath.ac.uk"
export MODLIST=""
export RAMDIRS="/tmp /var"
export TMPFS="tmpfs"
export TMPFS_SIZE="512k"
export READONLY_FS=""
export INETD_ARGS=""
export BOA_ARGS=""
export SMBD_ARGS=""
export NMBD_ARGS=""
export DHCP_ARG=""
export DEPLOYMENT_STYLE="JFFS2"
export SYSCFG_DHCPC_CMD="udhcpc -b -i "
export DROPBEAR_ARGS=""
# net interface 1
export SYSCFG_IFACE1=y
export INTERFACE1="eth0"
export IPADDR1="10.10.20.89"
export NETMASK1="255.255.0.0"
export BROADCAST1="10.10.255.255"
export GATEWAY1="10.10.10.1"
export NAMESERVER1="10.10.10.1"
[root@GsnCommsModule rc.d]# source rc.local
--------------------------------------------
VIEW ROUTING TABLE
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
------------------------------
ADD DEFAULT GATEWAY
[root@GsnCommsModule rc.d]# route add default gw 10.10.10.1 eth0
Routing table with 0.0.0.0 as destination is the default gateway.
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface.1
10.10.0.0 10.10.10.1 255.255.255.255 UGH 0 0 0 eth0
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.10.10.1 0.0.0.0 UG 0 0 0 eth0
------------------------
DELETE GATEWAY
[root@GsnCommsModule rc.d]# route del -net 10.10.0.0 netmask 255.255.255.255 gw 10.10.10.1 eth0
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.10.10.1 0.0.0.0 UG 0 0 0 eth0
[root@GsnCommsModule rc.d]# ifconfig -a
[root@GsnCommsModule rc.d]# cat rc.conf
all_services="mount-proc-sys mdev udev hostname devfsd depmod modules filesystems syslog network inetd portmap dropbear sshd boa smb dhcpd settime qtopia watchdog gtk2 pango"
all_services_r="pango gtk2 watchdog qtopia settime dhcpd smb boa sshd dropbear portmap inetd network syslog filesystems modules depmod devfsd hostname udev mdev mount-proc-sys"
cfg_services="mount-proc-sys mdev hostname depmod modules filesystems syslog network sshd settime "
cfg_services_r=" settime sshd network syslog filesystems modules depmod hostname mdev mount-proc-sys"
export HOSTNAME="GsnCommsModule [-m
export NTP_SERVER="ntp.cs.strath.ac.uk"
export MODLIST=""
export RAMDIRS="/tmp /var"
export TMPFS="tmpfs"
export TMPFS_SIZE="512k"
export READONLY_FS=""
export INETD_ARGS=""
export BOA_ARGS=""
export SMBD_ARGS=""
export NMBD_ARGS=""
export DHCP_ARG=""
export DEPLOYMENT_STYLE="JFFS2"
export SYSCFG_DHCPC_CMD="udhcpc -b -i "
export DROPBEAR_ARGS=""
# net interface 1
export SYSCFG_IFACE1=y
export INTERFACE1="eth0"
export IPADDR1="10.10.20.89"
export NETMASK1="255.255.0.0"
export BROADCAST1="10.10.255.255"
export GATEWAY1="10.10.10.1"
export NAMESERVER1="10.10.10.1"
[root@GsnCommsModule rc.d]# source rc.local
--------------------------------------------
VIEW ROUTING TABLE
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
------------------------------
ADD DEFAULT GATEWAY
[root@GsnCommsModule rc.d]# route add default gw 10.10.10.1 eth0
Routing table with 0.0.0.0 as destination is the default gateway.
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface.1
10.10.0.0 10.10.10.1 255.255.255.255 UGH 0 0 0 eth0
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.10.10.1 0.0.0.0 UG 0 0 0 eth0
------------------------
DELETE GATEWAY
[root@GsnCommsModule rc.d]# route del -net 10.10.0.0 netmask 255.255.255.255 gw 10.10.10.1 eth0
[root@GsnCommsModule rc.d]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.10.10.1 0.0.0.0 UG 0 0 0 eth0
Wednesday, May 25, 2011
Ubuntu --- install tftp Server
[1] http://pjpramod.blogspot.com/2009/08/setting-up-tftp-server-on-ubuntu-904.html
[2] http://www.ubuntugeek.com/howto-setup-advanced-tftp-server-in-ubuntu.html
-----------------------[1]---------------------------------------
quentin@ubuntu:~/lpc3250/ltib-qs$ sudo apt-get install tftpd-hpa
[2] http://www.ubuntugeek.com/howto-setup-advanced-tftp-server-in-ubuntu.html
-----------------------[1]---------------------------------------
quentin@ubuntu:~/lpc3250/ltib-qs$ sudo apt-get install tftpd-hpa
Running Java on Embedded Linux
[1] Libffi Official Link
[2] http://www.linuxquestions.org/questions/linux-kernel-70/locale-support-in-linux-kernel-811248/
[3] http://java.sun.com/developer/technicalArticles/JavaTechandLinux/RedHat/ ---NPTL from RedHat
[4] http://en.wikipedia.org/wiki/NPTL#cite_note-0 ---NPTL
[5] http://en.wikipedia.org/wiki/LinuxThreads ---NPTL replace LinuxThreads
[6] http://dev.maxtrack.com.br/index.php/Td60_notes#Set_Locale --- locale issue
[7] http://sourceware.org/ml/libffi-discuss/2009/msg00004.html --- mail list for using libffi for power pc.
[8] http://www.linuxquestions.org/questions/linux-general-1/locale-cannot-set-lc_all-to-default-locale-no-such-file-or-directory-218622/ --- check locale
[9] http://www.busybox.net/ --- busy box home page
[10] http://groups.google.com/group/netusg20/tree/browse_frm/month/2010-01/2d17cfad90f32150?rnum=31&lnk=ol --- localedef crash (same as locale-gen crash)
[11] http://www.linuxquestions.org/questions/linux-newbie-8/detect-glibc-version-based-on-libpthread-so-627968/ --- check Glibc version
[12] http://ubuntuforums.org/showthread.php?t=829866 ---- java class library loading error.
[13] http://www.coderanch.com/t/110728/Linux-UNIX/find-vma-failed-warning ---VM Stack warning.
[14] http://www.velocityreviews.com/forums/t149023-cant-detect-initial-thread-stack-location.html --- JVM Stack warning.
[15] Embedded JRE Download from Oracle --- EJRE
[16] http://www.linux-mtd.infradead.org/faq/jffs2.html#L_bbhandle ---- jffs2 file system CRC error on node
RUN REST SERVER ON LINUX USING JAVA
------------------------------------
[root@10 HandMade]# java -jar Make.jar &
[1] 384
[root@10 HandMade]# Jan 3, 1970 1:52:04 AM org.restlet.engine.http.connector.HttpServerHelper start
INFO: Starting the internal HTTP server on port 8182
From Browser:
http://10.10.20.89:8182/powergridiq/datapac
[root@10 HandMade]# ps -A --sort -rss -o comm,pmem |head -n 11
COMMAND %MEM
java 57.7
sh 5.5
ps 3.0
init 0.9
head 0.8
kthreadd 0.0
ksoftirqd/0 0.0
events/0 0.0
khelper 0.0
async/mgr 0.0
[root@10 HandMade]# cat /proc/meminfo
MemTotal: 28952 kB
MemFree: 1424 kB
Buffers: 0 kB
Cached: 11684 kB
SwapCached: 0 kB
Active: 13344 kB
Inactive: 12100 kB
Active(anon): 6732 kB
Inactive(anon): 7028 kB
Active(file): 6612 kB
Inactive(file): 5072 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 13792 kB
Mapped: 4444 kB
Shmem: 0 kB
Slab: 1100 kB
SReclaimable: 256 kB
SUnreclaim: 844 kB
KernelStack: 264 kB
PageTables: 116 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 14476 kB
Committed_AS: 31352 kB
VmallocTotal: 745472 kB
VmallocUsed: 428 kB
VmallocChunk: 744912 kB
Access REST server from browser
http://10.10.20.89:8182/powergridiq/datapac
WORKAROUND FOR CLASS LIBRARY LOADING ERROR
----------------------------------------------
Here's a workaround. It's for making the package install and configure properly, not for actually running java in the chrooted environment.
1. Install sun-java6-bin. It fails to configure.
2. Find out where libjli.so is. Do "locate libjli.so". In my case it was here:
/opt/jdk1.7.0/jre/lib/i386/jli/libjli.so
3. Set the LD_LIBRARY_PATH variable so that the package can configure properly. Enter the following command (using your location of libjli.so):
LD_LIBRARY_PATH=/opt/jdk1.7.0/jre/lib/i386/jli dpkg --configure -a
Hopefully it's now installed and configured correctly.
TRY RUNNING JAVA PROGRAM AFTER LOCALE IS SET CORRECTLY
-----------------------------------------------------
[root@10 HandMade]# java -jar Make.jar
Java HotSpot(TM) Client VM warning: Can't detect initial thread stack location - find_vma failed
Jan 1, 1970 12:44:27 AM org.restlet.engine.http.connector.HttpServerHelper start
INFO: Starting the internal HTTP server on port 8182
Calling C function from Java. [1]
-----------------------------------
CHECK GLIBC VERSION [11]
-------------------
[root@GsnCommsModule lib]# cat /lib/libpthread.so.0 |grep GLIBC
GLIBC_2.4
GLIBC_PRIVATE
pthread_cond_timedwait@@GLIBC_2.4
__libc_dlopen_mode@@GLIBC_PRIVATE
tfind@@GLIBC_2.4
pthread_attr_getaffinity_np@@GLIBC_2.4
__fsetlocking@@GLIBC_2.4
SOLVE LOCALE ISSUE TO GET EMBEDDED JAVA RUN IN EMBEDDED LINUX [2]
-----------------------------------------------------------------
From [8]
[root@GsnCommsModule /]# locale
LANG=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
[root@GsnCommsModule /]# locale -a
C
POSIX
[root@GsnCommsModule /]#
AFTER USING CODESOURCERY arm-2010q1 COMPILER
----------------------------------------------
arm-2010q1 is using newer version GCC (GCC4.41)
So all locale and language suit are generated in LTIB
Extra folders are removed so that only support wanted languages and font coding.
[root@LIQ-GateWay /]# locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8
[root@LIQ-GateWay /]# locale -a
C
en_GB
en_GB.utf8
en_US
en_US.utf8
POSIX
[root@LIQ-GateWay /]# locale -m
UTF-8
[2] http://www.linuxquestions.org/questions/linux-kernel-70/locale-support-in-linux-kernel-811248/
[3] http://java.sun.com/developer/technicalArticles/JavaTechandLinux/RedHat/ ---NPTL from RedHat
[4] http://en.wikipedia.org/wiki/NPTL#cite_note-0 ---NPTL
[5] http://en.wikipedia.org/wiki/LinuxThreads ---NPTL replace LinuxThreads
[6] http://dev.maxtrack.com.br/index.php/Td60_notes#Set_Locale --- locale issue
[7] http://sourceware.org/ml/libffi-discuss/2009/msg00004.html --- mail list for using libffi for power pc.
[8] http://www.linuxquestions.org/questions/linux-general-1/locale-cannot-set-lc_all-to-default-locale-no-such-file-or-directory-218622/ --- check locale
[9] http://www.busybox.net/ --- busy box home page
[10] http://groups.google.com/group/netusg20/tree/browse_frm/month/2010-01/2d17cfad90f32150?rnum=31&lnk=ol --- localedef crash (same as locale-gen crash)
[11] http://www.linuxquestions.org/questions/linux-newbie-8/detect-glibc-version-based-on-libpthread-so-627968/ --- check Glibc version
[12] http://ubuntuforums.org/showthread.php?t=829866 ---- java class library loading error.
[13] http://www.coderanch.com/t/110728/Linux-UNIX/find-vma-failed-warning ---VM Stack warning.
[14] http://www.velocityreviews.com/forums/t149023-cant-detect-initial-thread-stack-location.html --- JVM Stack warning.
[15] Embedded JRE Download from Oracle --- EJRE
[16] http://www.linux-mtd.infradead.org/faq/jffs2.html#L_bbhandle ---- jffs2 file system CRC error on node
RUN REST SERVER ON LINUX USING JAVA
------------------------------------
[root@10 HandMade]# java -jar Make.jar &
[1] 384
[root@10 HandMade]# Jan 3, 1970 1:52:04 AM org.restlet.engine.http.connector.HttpServerHelper start
INFO: Starting the internal HTTP server on port 8182
From Browser:
http://10.10.20.89:8182/powergridiq/datapac
[root@10 HandMade]# ps -A --sort -rss -o comm,pmem |head -n 11
COMMAND %MEM
java 57.7
sh 5.5
ps 3.0
init 0.9
head 0.8
kthreadd 0.0
ksoftirqd/0 0.0
events/0 0.0
khelper 0.0
async/mgr 0.0
[root@10 HandMade]# cat /proc/meminfo
MemTotal: 28952 kB
MemFree: 1424 kB
Buffers: 0 kB
Cached: 11684 kB
SwapCached: 0 kB
Active: 13344 kB
Inactive: 12100 kB
Active(anon): 6732 kB
Inactive(anon): 7028 kB
Active(file): 6612 kB
Inactive(file): 5072 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 13792 kB
Mapped: 4444 kB
Shmem: 0 kB
Slab: 1100 kB
SReclaimable: 256 kB
SUnreclaim: 844 kB
KernelStack: 264 kB
PageTables: 116 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 14476 kB
Committed_AS: 31352 kB
VmallocTotal: 745472 kB
VmallocUsed: 428 kB
VmallocChunk: 744912 kB
Access REST server from browser
http://10.10.20.89:8182/powergridiq/datapac
WORKAROUND FOR CLASS LIBRARY LOADING ERROR
----------------------------------------------
Here's a workaround. It's for making the package install and configure properly, not for actually running java in the chrooted environment.
1. Install sun-java6-bin. It fails to configure.
2. Find out where libjli.so is. Do "locate libjli.so". In my case it was here:
/opt/jdk1.7.0/jre/lib/i386/jli/libjli.so
3. Set the LD_LIBRARY_PATH variable so that the package can configure properly. Enter the following command (using your location of libjli.so):
LD_LIBRARY_PATH=/opt/jdk1.7.0/jre/lib/i386/jli dpkg --configure -a
Hopefully it's now installed and configured correctly.
TRY RUNNING JAVA PROGRAM AFTER LOCALE IS SET CORRECTLY
-----------------------------------------------------
[root@10 HandMade]# java -jar Make.jar
Java HotSpot(TM) Client VM warning: Can't detect initial thread stack location - find_vma failed
Jan 1, 1970 12:44:27 AM org.restlet.engine.http.connector.HttpServerHelper start
INFO: Starting the internal HTTP server on port 8182
Calling C function from Java. [1]
-----------------------------------
CHECK GLIBC VERSION [11]
-------------------
[root@GsnCommsModule lib]# cat /lib/libpthread.so.0 |grep GLIBC
GLIBC_2.4
GLIBC_PRIVATE
pthread_cond_timedwait@@GLIBC_2.4
__libc_dlopen_mode@@GLIBC_PRIVATE
tfind@@GLIBC_2.4
pthread_attr_getaffinity_np@@GLIBC_2.4
__fsetlocking@@GLIBC_2.4
SOLVE LOCALE ISSUE TO GET EMBEDDED JAVA RUN IN EMBEDDED LINUX [2]
-----------------------------------------------------------------
From [8]
[root@GsnCommsModule /]# locale
LANG=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
[root@GsnCommsModule /]# locale -a
C
POSIX
[root@GsnCommsModule /]#
AFTER USING CODESOURCERY arm-2010q1 COMPILER
----------------------------------------------
arm-2010q1 is using newer version GCC (GCC4.41)
So all locale and language suit are generated in LTIB
Extra folders are removed so that only support wanted languages and font coding.
[root@LIQ-GateWay /]# locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8
[root@LIQ-GateWay /]# locale -a
C
en_GB
en_GB.utf8
en_US
en_US.utf8
POSIX
[root@LIQ-GateWay /]# locale -m
UTF-8
Subscribe to:
Posts (Atom)