Often people want to launch a command in an already
running container. This can be achieved with the lxc-attach
command, provided you have a patched kernel with full
setns() support.
For those who won't rebuild a kernel, we introduce
the lxc-rexec command to be used in place of
lxc-attach. The principle is to embed a minimal
unix socket server in lxc-init that launch commands when
asked to by a lxc-rexec client.
For the moment, this feature only works for application
containers started with lxc-execute. Some more work
would be needed to have something similar for system
containers (and by the way, system containers with network
support may rely on rsh-like services to do the trick).
The first two patches add a mainloop and logging features
to lxc-init, and the last patch brings lxc-rexec.
---
Greg Kurz (3):
lxc: introduce lxc-rexec
lxc-init: use lxc logging infrastructure
lxc-init: use lxc_mainloop
configure.ac | 1
doc/Makefile.am | 1
doc/lxc-rexec.sgml.in | 151 ++++++++++++++
src/lxc/Makefile.am | 7 -
src/lxc/arguments.h | 3
src/lxc/error.c | 23 ++
src/lxc/error.h | 3
src/lxc/execute.c | 66 ++++++
src/lxc/execute.h | 28 +++
src/lxc/lxc.h | 1
src/lxc/lxc_execute.c | 3
src/lxc/lxc_init.c | 511 ++++++++++++++++++++++++++++++++++++++-----------
src/lxc/lxc_rexec.c | 337 ++++++++++++++++++++++++++++++++
13 files changed, 1014 insertions(+), 121 deletions(-)
create mode 100644 doc/lxc-rexec.sgml.in
create mode 100644 src/lxc/execute.h
create mode 100644 src/lxc/lxc_rexec.c
--
Greg
------------------------------------------------------------------------------
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