This is a page of "How to" solve some computer problems that may happen.

P = problem; S = solution

P: (2010.01.19) Managing ntp

S: ntp and ntpdate package have to be configured in some tricky ways

P: (2010.01.13) The problem of 2010.1.6 is solved but response is slow.

S: The problem is due to the fact that /etc/mtab is on root (not snapshot)

Since we do not know what is the process of mount the file. we can not change mtab to snapshot. For a moment, we force mount /home1 and /rsaito on /tmp/home1, /tmp/rsaito

/etc/rc5.d/S28autofs stop
mkdir /tmp/home1
mkdir /tmp/rsaito
mount -n 192.168.2.100:/home1 /tmp/home1
mount -n 192.168.2.100:/rsaito /tmp/rsaito
df

/rsaito/bin/pxe-mount

P: (2010.1.6) /rsaito is not automountd on PXE client.

S: edit and add flexS:/rsaito information on

tube30:/nfsboot/root/etc/mtab

P: (2009.10.10) Gnorm logout is slow for Xming etc.

This is a firewall problem of windows.

S: Open port 16001 tcp

control panel -> firewall -> add new port ->

Name Esound
Port 16001
     TCP

P: (2009.07.17) Load average of FLEX is very high.

This is due to mounting problem again (mount NFS). After checking mount status, it is found that a network harddisk was not unmounted nicely before turning off.

S: Re-mount (turn on) the harddisk, and do some safety procedure.

P: (2009.07.02) Flex is unstable for logining or e-mails.

S: mount to tube:/home1-old was not allowed any more.

comment out one line in /etc/auto.misc 
# home1    172.17.4.134:/home1-old
./S28autofs forcerestart
I also delete in /etc/exports 
the requests from 172.17.4.184 (nuguraha) 172.17.4.188 (mahabubu)
and 172.17.4.127 (furu).
exportfs -a
we also need to restart nfs
/etc/rc5.d/S60nfs restart

P: (2009.06.03) Today we were failed to run ether-wake command on new-PXE server/client machines using new Hub/router.

S: We manually turn those on and off. After that ether-wake (wake-on-Lan) command was successful.

P: PXE (network boot) is now installing 2009.5.1

S: finished. status PXE Server (Open)

P: We move /etc/passwd then we can not be root. No more even shutdown.

S: cntl-alt-del and reboot. Then when OS selection, push any arrow.

Then many selection of OS appears. Select one of OS, and press E. Then select kernel and press E again. Then you can edit the command for starting kernel and add "single" in the last of the command. Finally select "b" for booting and single user mode appears. Make /etc/passwd files and exit and runlevel 5 is recovers.

Even if we used NIS, we should not delete /etc/passwd /etc/group and /etc/shadow.

P: linux emacs ispell error (no language "eu") 2009.4.24

S: solved. "M-x ispell-change-dictionary" and select english

S: solved. Edit .emacs to add (setq ispell-dictionary "english")

P: How to update the files of remote to the files of local

S: solved. "rsync -avc -e ssh saito@remote:/home/saito/book09/ /rsaito/book09"


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