Current aufs supports FS_USERNS_MOUNT by using allow_userns module
parameter. It allows root in userns to mount aufs.
This patch allows an unprivileged container to use aufs. The value of
xino option is changed to /dev/shm/aufs.xino that an unpriv user can
write.
Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
(I erred in the first patch, causing every lxc-attach to unmount the
container-'s /proc)
Since we now use mount_proc_if_needed() from attach, as opposed to only
from start, we cannot assume we are pid 1. So fix the check for whether
to mount a new proc.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
To set lsm labels, a namespace-local proc mount is needed.
If a container does not have a lxc.mount.auto = proc set, then
tasks in the container do not have a correct /proc mount until
init feels like doing the mount. At startup we handlie this
by mounting a temporary /proc if needed. We weren't doing this
at attach, though, so that
lxc-start -n $container
lxc-wait -t 5 -s RUNNING -n $container
lxc-attach -n $container -- uname -a
could in a racy way fail with something like
lxc-attach: lsm/apparmor.c: apparmor_process_label_set: 183 No such file or directory - failed to change apparmor profile to lxc-container-default
Thanks to Chris Townsend for finding this bug at
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1452451
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
On certain systems, some binaries needed by the container features (dropbear,
openssh), may be placed in non-standard (aka non-distribution-managed
locations), such as /usr/local/*, /opt/local/*, etc. Don't copy the respective
binaries in the container and return a clear error why.
The user should only use these binaries if they are installed at system-wide
locations on the host, such as /{s,}bin or /usr/{s,}bin.
v2:
- check that binary paths adhere to /{,usr/}{,s}bin only
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Currently, when installing OpenSSH in a Busybox container, the template searches
for all the OpenSSH client binaries available in the Debian distro package. The
included tools might differ from distro to distro, so make part of the tools
optional. The mandatory tools, without which installing OpenSSH fails, are
"sshd" for the server and "ssh" and "scp" for the client.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Add the description about displaying the value of wait delays for -L
option
Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
to populate the list of subsystems to use.
Cgmanager can be started with some subsystems disabled (i.e.
cgmanager -M cpuset). If lxc using cgmanager then uses the
/proc/self/cgroup output to determine which controllers to use,
it will fail when trying to do things to cpuset. Instead, ask
cgmanager which controllers to use.
This still defers (per patch 1/1) to the lxc.cgroup.use values.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Doing this requires some btrfs functions from bdev to be used in
utils.c Because utils.h is imported by lxc_init.c, I had to create
a new initutils.[ch] which are used by both lxc_init.c and utils.c
We could instead put the btrfs functions into utils.c, which would
be a shorter patch, but it really doesn't belong there. So I went
the other way figuring there may be more such cases coming up of
fns in utils.c needing code from bdev.c which can't go into lxc_init.
Currently, if we detect a btrfs subvolume we just remove it. The
st_dev on that dir is different, so we cannot detect if this is
bound in from another fs easily. If we care, we should check
whether this is a mountpoint, this patch doesn't do that.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
In setup where we want to sniff with an IDS from inside a container
we can use the 'passthru' mode of macvlan. This was not accessible
from the config and this patch fixes the issue.
Signed-off-by: Eric Leblond <eric@regit.org>
When running in posix mode (for example, because it was invoked as `sh`,
or with the --posix option), bash rejects the function names previously
used because they contain hyphens, which are not legal POSIX names, and
exits immediately.
This is a particularly serious problem on a system in which the
following three conditions hold:
1. The `sh` executable is provided by bash, e. g. via a symlink
2. Gnome Display Manager is used to launch X sessions
3. Bash completion is loaded in the (system or user) profile file
instead of in the bashrc file
In that case, GDM's Xsession script (run with `sh`, i. e., bash in posix
mode) sources the profile files, thus causing the shell to load the bash
completion files. Upon encountering the non-POSIX-compliant function
names, bash would then exit, immediately ending the X session.
Fixes#521.
Signed-off-by: Lucas Werkmeister <mail@lucaswerkmeister.de>
The lxc-debian template debootstraps a minimum debian system which does not contain dbus.
If systemd is used this will result in getty-static.service to be used instead of getty@ .
The systemd default files uses 6 tty's instead of the 4 the script creates.
This will lead to repeated error messages in the systemd journal.
Signed-off-by: Cyril Bitterich <Cyril.Bitterich@1und1.de>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
AppArmor ships /lib/apparmor/profile-load. /lib/init/apparmor-profile-load is
merely a wrapper which calls the former, so just call it directly to avoid the
dependency on the wrapper.
LP: #1432683
We need to use lxc_list_for_each_safe, otherwise de-allocation
will fail with a list size bigger than 2. The pointer to the head
of the list also need freeing after we've freed all other elements
of the list.
Signed-off-by: Kien Truong <duckientruong@gmail.com>
Add a function to sort the cgroup settings before applying.
Currently, the function will put memory.memsw.limit_in_bytes after
memory.limit_in_bytes setting so the container will start
regardless of the order specified in the input. Fix#453
Signed-off-by: Kien Truong <duckientruong@gmail.com>
Otherwise a container created before we needed workdir will fail
to start after a kernel+lxc update.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
CRIU can get confused if there are two dumps that are written to the same
directory, so we make some minimal effort to prevent people from doing this.
This is a better alternative than forcing liblxc to create the directory, since
it is mostly race free (and neither solution is bullet proof anyway if someone
rsyncs some bad images over the top of the good ones).
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
This updates lxc-net with the following changes:
- Better recover from crashes/partial runs
- Better error detection and reporting
- Less code duplication (use the stop code on crash)
- Better state tracking
- Allow for restart of all of lxc-net except for the bridge itself
- Only support iproute from this point on (ifconfig's been deprecated
for years)
V2: Use template variables everywhere
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
If Lua 5.3 is compiled with LUA_COMPAT_5_2 defined, the
luaL_checkunsigned compatibility macro is already defined
in lauxlib.h.
Signed-off-by: Thomas Moschny <thomas.moschny@gmx.de>
(1) Add test for kernel version greater 3.
(2) Use && and || instead of -a and -o as suggested in
http://www.unix.com/man-page/posix/1p/test/.
lxc-checkconfig will currently report "missing" on "Cgroup memory controller"
for kernel versions greater 3. This happens because the script, before checking
for the corresponding memory variable in the kernel config, currently will test
whether we have a major kernel version greater- or equal to 3 and a minor kernel
version greater- or equal to 6. This adds an additional test whether we have a
major kernel version greater than 3.
Signed-off-by: Christian Brauner <christianvanbrauner@gmail.com>
Particularly when using the go-lxc api with lots of threads, it
happens that if the open files limit is > 1024, we will try to
select on fd > 1024 which breaks on glibc.
So use poll instead of select.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
The logging code uses a global log_fd and log_level to direct
logging (ERROR(), etc). While the container configuration file allows
for lxc.loglevel and lxc.logfile, those are only used at configuration
file read time to set the global variables. This works ok in the
lxc front-end programs, but becomes a problem with threaded API users.
The simplest solution would be to not allow per-container configuration
files, but it'd be nice to avoid that.
Passing a logfd or lxc_conf into every ERROR/INFO/etc call is "possible",
but would be a huge complication as there are many functions, including
struct member functions and callbacks, which don't have that info and
would need to get it from somewhere.
So the approach I'm taking here is to say that all real container work
is done inside api calls, and therefore the API calls themselves can
set a thread-local variable indicating which log info to use. If
unset, then use the global values. The lxc-* programs, when called
with a '-o logfile' argument, set a global variable to indicate that
the user-specified value should be used.
In this patch:
If the lxc container configuration specifies a loglevel/logfile, only
set the lxc_config's logfd and loglevel according to those, not the
global values.
Each API call is wrapped to set/unset the current_config. (The few
exceptions are calls which do not result in any log actions)
Update logfile appender to use the logfile specified in lxc_conf if (a)
current_config is set and (b) the lxc-* command did not override it.
Changelog (2015-04-21):
. always re-set current_config to NULL at end of an API
call, rather than storing the previous value. We don't
nest API calls.
. remove the log_lock stuff which wasn't used
. lxc_conf_free: if the config is current_config, set
current_config to NULL. (It can't be another thread's
current_config, or we wouldn't be freeing it)
. lxc_check_inherited: don't close fd if it is the
current_config->logfd. Note this is only called when
starting a container, so we have no other threads at
this point.
Changelog (2015-04-22)
. Unset the per-container logfd on destroy
.
. Do so before we rm the containerdir. Otherwise if the logfile is set
. to $lxcpath/$name/log, the containerdir won't be fully deleted.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Add an additional template parameter for SSH support in the container. Currently
this can be implemented using the Dropbear or OpenSSH utility. The respective
tool needs to be available on the host Linux.
If the parameter is omitted, the template will look for the Dropbear utility on
the host and install it if it is available (legacy behavior).
Adding OpenSSH support has been done following the model in the lxc-sshd
template.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
If we don't re-open these after clone, the init process has a pointer to the
parent's /dev/{zero,null}. CRIU seese these and wants to dump the parent's
mount namespace, which is unnecessary. Instead, we should just re-open
stdin/out/err after we do the clone and pivot root, to ensure that we have
pointers to the devcies in init's rootfs instead of the host's.
v2: Only close fds if the container was daemonized. This didn't turn out as
nicely as described on the list because lxc_start() doesn't actually have
the struct lxc_container, so it cant see the flag. Instead, we just pass it
down everywhere.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
