[Devel] Re: [RFC][PATCH 0/5][lxc]: Link with USERCR

[Michel Normand]

Le jeudi 18 mars 2010 à 23:39 -0700, Sukadev Bhattiprolu a écrit :
> Link lxc_checkpoint, lxc_restart with USERCR[2]
> 
> Following set of patches, when applied to LXC 0.6.5 and built with
> USERCR, enable lxc_checkpoint and lxc_restart of some simple containers.
> 
> TODO:
> 	- For simplicity, this patchset currently links *statically* with
> 	  USERCR. We should eventually build checkpoint.o and restart.o in
> 	  USERCR as shared objects and link lxc_checkpoint/lxc_restart with
> 	  these shared objects and liblxc.so. (This also required rebuilding
> 	  lxc-execute statically, so lxc_checkpoint can communicate with
> 	  lxc-execute to get the root-pid of container).
> 
> 	- Determine if lxc_checkpoint needs a --container option (see
> 	  TODOs in src/lxc/checkpoint.c)
> 
> 	- This patchset was tested using lxc-macvlan.conf. But for the VNC
> 	  server testing I ran into a problem with lxc-macvlan.conf. I
> 	  switched to 'lxc-no-netns.conf' and was able to C/R the VNC server.
> 	  I have not debugged the problem with VNC and lxc-macvlan.conf.
> 
> 	- 'global_send_sigint' is still a global variable in USERCR. We need
> 	  to define a better interface to expose its functionality to callers
> 	  of app_restart().
> 
> 	- Choose better names and API for USERCR :-)
> 
> Changelog[v2]: 
> 	(Based on feedback from Oren Laadan, Serge Hallyn, Daniel Lezcano
> 	and Cedric Le Goater)
> 
> 	- Rather than drop --directory option to lxc_checkpoint/lxc_restart
> 	  add a new option (--image).
> 
> 	- Integrate lxc_checkpoint to work with USERCR
> 
> 	- USERCR renamed usercr.h to "app-checkpoint.h"
> 
> 	- USERCR does not create/install libcheckpoint.a and usercr.h for now.
> 	  So link directly with app-checkpoint.h, restart.o and checkpoint.o
> 
> 	- USERCR renames the interfaces to app_checkpoint() and app_restart()
> 	  'struct app_checkpoint_args' 'struct app_restart_args'.
> 	  
> USAGE:
> 
> 1. Build USERCR
> 
> 	$ cd /root
> 
> 	$ git-clone git://git.ncl.cs.columbia.edu/pub/git/user-cr.git user-cr
> 
> 	$ git-checkout ckpt-v20 
> 	
> 	# Apply patches in the following set:
> 
> 	# https://lists.linux-foundation.org/pipermail/containers/2010-March/023793.html
> 
> 	$ cd /root/user-cr
> 
> 	$ make 
> 
> 		This should create restart.o and checkpoint.o
> 
> 2. Build/install lxc_checkpoint and lxc_restart
> 
> 	# Do normal LXC build/install of 0.6.5.
> 
> 	# Then replace 'lxc-execute', 'lxc-checkpoint', 'lxc-restart' with
> 	# new version. i.e Apply attached patches and:
> 
> 	$ cd src/lxc

Your patch set is not usable as is, with requirement to apply the patch
between two sequences of build, and lxc unable to be built with it.

Please do a patch of automake files and related configure.ac
rather than to create a Makefile2 file.

> 
> 	$ USERCR=/root/user-cr \
> 		make -f Makefile2 lxc_checkpoint lxc_restart lxc_execute
> 
> 	$ cp lxc_checkpoint lxc_restart lxc-execute  /usr/local/bin
> 
> 3. Checkpoint/restart a simple LXC container
> 
> 	$ lxc-execute --name foo --rcfile lxc-no-netns.conf -- /bin/sleep 1000
> 
> 	$ lxc-freeze --name foo
> 
> 	$ lxc-checkpoint --name foo --image /root/lxc-foo.ckpt
> 
> 	$ lxc-unfreeze --name foo
> 
> 	$ lxc-stop --name foo
> 
> 	$ lxc-restart --name foo --image /root/lxc-foo.ckpt
> 
> 4. Checkpoint/restart other LXC containers such as:
> 
> 	- a file-io session (see run-fileio1 in cr-tests[1])
> 
> 	- process-tree (see run-ptree1 in cr-tests[1])
> 
> 	- A vi session inside a VNC Server using "twm". i.e
> 
> 		$ cat /root/.vnc/xstartup
> 		#!/bin/sh
> 
> 		xsetroot -solid grey
> 		vncconfig -iconic &
> 		xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
> 		twm &
> 
> 		$ lxc-execute --name foo --rcfile lxc-no-netns.conf -- \
> 			/usr/bin/vncserver :1
> 
> 		$ vncviewer :1
> 
> 			# Open a vi session
> 
> 		$ lxc-freeze --name foo 
> 
> 			etc
> 
> [1]: cr-tests:	git://git.sr71.net/~hallyn/cr_tests.git
> [2]: USERCR: git://git.ncl.cs.columbia.edu/pub/git/user-cr.git
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
> _______________________________________________
> Containers mailing list
> Containers at lists.linux-foundation.org
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