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soc:2009:pravin:journal:fedora11bko [2009/07/21 12:21]
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soc:2009:pravin:journal:fedora11bko [2009/07/27 05:35] (current)
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-====== Fedora over NFS ====== +====== Fedora ​11 live over NFS ====== 
-Booting ​Fedora over NFS.  ​Plan ​is to export the ISO over NFS from my laptop and see if it works.+Trying to see if Fedora ​11 live can boot over NFS.\\ 
 +The reasoning behind this experimentation ​is that, if it works over NFS then it may help in locating the problem. 
  
 ==== Testing NFS setup ==== ==== Testing NFS setup ====
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 </​code>​ </​code>​
 Why would this fail if mounting from localhost is working fine? Why would this fail if mounting from localhost is working fine?
 +
 +Got help from rwrc, and fixed the problem.\\
 +It seems one more option has to be added to export options ''​insecure'',​ restating the explanation given by rwcr
 +<​code>​
 +rwcr: Try making it /var/www *(ro,​async,​insecure)
 +rwcr: Linux generally requires NFS requests to come from privileged ports, and the Fedora livecd might be using a nonstandard NFS mounter that doesn'​t do that.
 +</​code>​
 +
 +===== Next step : mount NFS partition from initramfs =====
 +Debian uses special program called ''​nfsmount''​ for NFS mounting at boot time, I will try out both. The mount command and nfsmount utility.\\
 +Also, the kernel module be needed.
 +Following modules and executable ''/​sbin/​mount.nfs''​ was needed for NFS to work
 +   - sunrpc.ko
 +   - lockd.ko
 +   - auth_rpcgss.ko
 +   - nfs_acl.ko
 +   - nfs.ko
 +In addition to this, I had to pass option ''​-o nolock''​ for mount to work without problems
 +<​code>​
 +mount "​${NFS_PATH} /iso -o nolock"​
 +mount /​iso/​Fedora-11-i686-Live.iso /sysroot -o loop -o ro
 +</​code>​
 +
 +NFS works fine in run level 3. also one can start the GUI with ''​startx''​ after logging in as ''​root''​ from multiuser prompt.\\
 +The only issue with NFS_Fedora is that ''​plymountd''​ still creates a problem and is disabled and it somehow stops GUI coming up automatically.\\
 +So, the user need to login in run-level 3 and then do the ''​startx''​
 +
 +
 +==== HTTPFS improvement ====
 +Some progress has been done on HTTPFS front also.  Till now, all the tests of booting over HTTPFS were done using ''​qemu''​ which is inherently slow as it is emulation.
 +When same tests were run on vmware, which is much faster, errors started comming after runlevel - 3 login prompt\\
 +Following are the errors, which are quite same as those errors which use to come around sendmail daemon before.
 +
 +<​code>​
 +# startx
 +-bash: /​usr/​bin/​startx:​ Input/​output error
 +
 +# top
 +top : error while loading shared libraries: /​lib/​libncursesw.so.5:​ cannot read file data: Input/​output error
 +
 +EXT4-fs error (device dm-0): ext4_find_entry:​ reading directory #10651 offset 0
 +</​code>​
 +With this observation,​ we can claim that errors are thrown because there is delay in response from fuse.  The ext4-fs is giving up because of this delay.\\
 +Now, I need to find a way to increase the tolerance for this delay.
 +
 +
 +===== Removing plymouth =====
 +As marc has suggested, remove ''​plymount''​ from original iso, and see if it works without plymount.
 +If it doesn'​t then blame can be surely put on ''​plymount''​ and not the network related complications. \\
 +
 +==== Modifying ISO ====
 +Now, the question is, how to add new initramfs into ISO and still keep it bootable?\\
 +From Remastering Knoppix Howto, following is the command which works for knoppix
 +<​code>​
 +mkisofs -pad -l -r -J -v -V "​KNOPPIX"​ -no-emul-boot -boot-load-size 4 \
 +   ​-boot-info-table -b boot/​isolinux/​isolinux.bin -c boot/​isolinux/​boot.cat \
 +   ​-hide-rr-moved -o /​mnt/​hda1/​knx/​knoppix.iso /​mnt/​hda1/​knx/​master
 +</​code>​
 +
 +and I need to modify it, so that it will work for fedora.
 +
 +<​code>​
 +mkisofs -pad -l -r -J -v -V "​Fedora-11-i686-Live"​ -no-emul-boot -boot-load-size 4 \
 +   ​-boot-info-table -b isolinux/​isolinux.bin -c isolinux/​boot.cat \
 +   ​-hide-rr-moved -o /​var/​www/​iso/​fedora_11.iso /​home/​pravin/​Etherboot/​git/​BKO.git/​pxeknife/​red_hat/​fedora_11_live_cd/​newfedora
 +</​code>​
 +===== running startx from single user mode =====
 +Tried an experiment of running ''​startx''​ from single user mode and see if it works.\\
 +Well it did not worked atall.
 +
 +===== Problem Found =====
 +With help of andyTim, the cause of problem has been located.\\
 +The ''​network''​ and ''​NetworkManager''​ do restart the networking which breaks the existing HTTPFS mount.
 +
 +
 +===== Solution =====
 +The temporary solution tried is delete both of following files
 +  - ''/​etc/​init.d/​network''​
 +  - ''/​etc/​init.d/​NetworkManager''​
 +So, user has to first boot into single user mode, delete above files,
 +and then boot into runlevel 5.
  
  

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