Using a computer on and off the network

[oc7]

Hi.

 

I usually post on the tes but have been advised this is a better forum for more technical questions. I have tried the search and cannot find my solution but if it has been asked before I apologise and hope you put it down to my newbie status.

 

I have a laptop that is setup to log on to the network. If no network is available then as you would expect I can log on as a stand alone user. I have a work folder that allows me to pass documents from my stand alone profile to the network and back again.

 

I have two problems (probably one problem with two symptoms)

 

i) I cannot connect to the Internet at work when I am in stand alone mode as connecting to the network at any point causes the network home directory to mount.

 

ii) When I run it off the network at home I can connect to the Internet but the machine struggles (takes quite a few minutes) when starting up appliacations. Once started they run at normal speed although seem to be slightly more prone to needing a Force Quit.

 

It seems that once on a network it must be trying to sort out the filesystem but I cannot find how to stop this.

 

I am running Edubuntu 7.04.

 

Any thoughts? Anyone come across this before?

 

Thanks in anticipation

 

oc7 (kev)

[powdarrmonkey]

Sounds vaguely like you're mounting a network drive at startup. Paste the contents of /etc/fstab.

[oc7]

I am mounting a network drive at start up.

 

Won't be able to paste the contents of fstab until tomorrow though.

 

Thanks for your quick response.

 

The mount line (from memory)

 

mount LINUXSERVER:/home /home ...

 

also there is a shared drive

 

mount SENECA00:/media/seneca /mnt/comaprtida

 

the rest is as default

[powdarrmonkey]

I thought so. Add the noauto flag to stop them mounting at boot time, then mount them manually if circumstances permit by saying:

sudo mount 
e.g. sudo mount /home/myuser

 

You will be prompted for your password to become sudo, as usual.

 

Also, it's probably not a good idea to store the whole /home directory remotely. At least, I wouldn't do it, but your mileage may vary.

[oc7]

Thanks, I will try that.

 

Won't be able to mount the network until I go back to school in a few weeks time but looks like I will be able to work at home without having to make a cup of tea everytime I want to start a new app.

 

The rest of your reply throws up some more questions but I will save them for another day.

 

Off for a well earned first beer of the weekend

 

thanks again

 

oc7 (kev)

[oc7]

I have added the noauto option as suggested with no effect, here is my fstab file

 

# /etc/fstab: static file system information.
#
#                
proc            /proc           proc    defaults        0       0
# /dev/sda6
UUID=553ae6d9-42ba-439e-b0a9-7be9deba78d9 /               ext3    defaults,errors=remount-ro 0       1
# /dev/sda7
UUID=afec6bf4-901a-442d-801f-b970cde00293 /home           ext3    defaults        0       2
# /dev/sda1
UUID=D89890D09890AE8E /media/sda1     ntfs    defaults,nls=utf8,umask=007,gid=46 0       1
# /dev/sda5
UUID=c77f3f84-7f07-11db-b4ae-61344fa83f19 none            swap    sw              0       0
/dev/scd0               /media/cdrom0   udf,iso9660 user,noauto  0 0
LINUXSERVER:/home       /home           nfs         user,noauto  0 0
SENECA00:/media/seneca  /mnt/compartida nfs         user,noauto  0 0

 

Any help gratefully received.

 

P.S. I tried commenting out the last two lines and this didn't help either.

[ysangkok]

You could try strace'ing the apps that slow down when reading from filesystem. You can look in the strace logs to see what file they are trying to access.

 

But it does not look as if the problem is FS related IMHO.

[oc7]

One of the consequences of the problem is that when I try and start a terminal session the terminal remains blank, that is, I don't get a prompt. If I try and log on as root (through ctrl f1) it times out.

 

To edit fstab I have to disconnect. I would have to do the same to run the strace and so would be strac-ing when the system is running fine.

 

Also, once the application is up and running there isn't really a problem.

 

Currently, I am disconnecting from the network, starting up all the apps I want to use then reconnecting. When I want to start a new app I disconnect again. It is a bit mad as I have to do this for something as simple as getting the properties of a file!

 

Maybe the way I am going about this is flawed, is there a better way of using my laptop at school (on the network) and at home?

[ysangkok]

I have encountered the problem with a terminal that starts too slow myself. It is often because Ubuntu and other distros have bash-completion enabled by default. It takes some resources. If you want it to be quicker I suggest one of these methods:

1. Changing to a simpler shell, i.e. /bin/sh. You can change the shell by editing the last field in /etc/passwd, or by executing "chsh".
   
2. Uninstalling the bash-completion package, however I am not sure if this disables all the resource hungry stuff
   
3. Sometimes it works if you press Control-C at bash startup. The scripts that are running will be terminated and you should get a prompt.
   
4. Edit .bashrc and the other scripts to disable stuff.
   

 

You say that applications are running at full speed when they are launched. Have you tried benchmarking your harddrive? Also, if you do a "find /" I imageine that it would halt before finding the files on the slow FS. That seems like a logical way to find out if it is a FS related problem.

[powdarrmonkey]

I'm still inclined to think that mounting /home off the network is not helping you. I would keep it local and mount your network stuff somewhere else, perhaps use rsync (or backintime, which is rsync + cron + diff in a nice Gnome gui) to stay in sync.

[oc7]

I think it is/was a mounting problem.

 

Although the noauto appeared not to work and then commenting out also appeared to fail it is now working fine. Not sure why it didn't work straight away but there you go.

 

Thanks for the suggestions folks.

 

I will have a look at backintime, thnaks again

 

oc7 (Kev)