Resending patches after fixing whitespace damage and the typo in
configure.ac. Add a section to patch-0 (below) to describe the
kernel build (commit-id, config tokens etc).
---
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:
- Determine if lxc_checkpoint needs a --container option (see
TODOs in src/lxc/checkpoint.c)
- This patchset was tested using lxc-nonetns.conf. I ran into a problem
creating a bridge with lxc-veth.conf and lxc-macvlan.conf. 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 :-)
- Additional TODOs specific to checkpoint/restart are listed in their
specific patches.
Changelog[v3]:
- Renamed --image option to --statefile
- Added --with-libcr configuration option to specify the path to
usercr (see usage below).
- lxc-checkpoint now implicitly freezes before and unfreezes after
checkpoint.
- Implemented the --pause options to lxc-checkpoint and lxc-restart
and the --kill option to lxc-checkpoint.
- Ported to ckpt-v20-dev (required adding CHECKPOINT_NONETNS flag to
app_checkpoint() to work around)
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 C/R-enabled Linux kernel
$ cd /root
$ git-clone git://www.linux-cr.org/pub/git/linux-cr.git linux-cr
$ cd linux-cr
$ git-checkout ckpt-v20-dev
I tested with commit 3522c57a9ec6f08a129a78322318abcb4467db28
as HEAD.
# Ensure following tokens are set in .config
CONFIG_CHECKPOINT_SUPPORT=y
CONFIG_SYSVIPC_CHECKPOINT=y
CONFIG_CHECKPOINT=y
CONFIG_CHECKPOINT_NETNS=y
CONFIG_CHECKPOINT_DEBUG=y
CONFIG_CGROUPS=y
CONFIG_CGROUP_FREEZER=y
CONFIG_NAMESPACES=y
CONFIG_CGROUP_NS=y
CONFIG_UTS_NS=y
CONFIG_IPC_NS=y
CONFIG_USER_NS=y
CONFIG_PID_NS=y
CONFIG_NET_NS=y
# Build, install, reboot on new kernel
# After every reboot, ensure '-o newinstance' mount option to /dev/pts
works (see Documentation/filesystems/devpts.txt for details). In
short, run following commands on each reboot:
$ rm /dev/ptmx
$ ln -s pts/ptmx /dev/ptmx
$ chmod 666 /dev/pts/ptmx
1. Build USERCR
$ cd /root
$ git-clone git://git.ncl.cs.columbia.edu/pub/git/user-cr.git user-cr
$ cd user-cr
$ git-checkout ckpt-v20-dev
Tested with commit e275f77e4a82d228c1df14dbeb691342e32cdac2
as HEAD.
# Apply following two patches:
https://lists.linux-foundation.org/pipermail/containers/2010-March/024037.html
https://lists.linux-foundation.org/pipermail/containers/2010-March/024038.html
$ KERNELSRC=/root/linux-cr make
Build USERCR by pointing to corresponding kernel-source.
This should create restart.o and checkpoint.o needed by LXC.
I did not need to, but you may need to compile checkpoint.o
and restart.o with -fPIC compiler option.
$ make install
2. Build/install LXC
$ cd /root
$ git-clone git://lxc.git.sourceforge.net/gitroot/lxc/lxc lxc.git
$ cd lxc.git
# Apply attached patches to LXC (I tested with these patches applied
to commit 9ea8066aa67b808f71f46e346bd7a215e2a355f3)
$ autogen.sh
$ ./configure --with-libcr=/root/user-cr
This will fail if /root/user-cr does not container checkpoint.o,
restart.o and app-checkpoint.h files
$ make
$ make install
3. Checkpoint/restart a simple LXC container
$ lxc-execute --name foo --rcfile lxc-no-netns.conf -- /bin/sleep 1000
$ lxc-checkpoint --name foo --statefile /root/lxc-foo.ckpt
$ lxc-stop --name foo
$ lxc-restart --name foo --statefile /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-checkpoint --name foo --statefile /root/vnc.ckpt
$ lxc-stop --name foo
$ lxc-restart --pause --name foo --statefile /root/vnc.ckpt
# Leaves the server frozen due to --pause
$ lxc-unfreeze --name foo
$ vncviewer :1
# Should bring up the old VNC session with vi window
[1]: cr-tests: git://git.sr71.net/~hallyn/cr_tests.git
Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
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