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lxc-ls: Implement support for nested containers

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Add initial support for showing and querying nested containers.

This is done through a new --nesting argument to lxc-ls and uses
lxc-attach to go look for sub-containers.

Known limitations include the dependency on setns support for the PID
and NETWORK namespaces and the assumption that LXCPATH for the sub-containers
matches that of the host.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Stéphane Graber 2013-02-28 18:04:46 -05:00
parent 36368228d2
commit 0e21ea4b15
3 changed files with 81 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
doc/lxc-ls.sgml.in
View File

@ -56,6 +56,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<arg choice="opt">--stopped</arg>
<arg choice="opt">--fancy</arg>
<arg choice="opt">--fancy-format</arg>
<arg choice="opt">--nesting</arg>
<arg choice="opt">filter</arg>
</cmdsynopsis>
</refsynopsisdiv>
@ -150,6 +151,17 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
</listitem>
</varlistentry>
<varlistentry>
<term>
<option><optional>--nesting</optional></option>
</term>
<listitem>
<para>
Show nested containers.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option><optional>filter</optional></option>

75
src/lxc/lxc-ls
View File

@ -31,9 +31,11 @@ warnings.filterwarnings("ignore", "The python-lxc API isn't yet stable")
import argparse
import gettext
import json
import lxc
import os
import re
import subprocess
import sys
_ = gettext.gettext
@ -85,6 +87,23 @@ def getTerminalSize():
return int(cr[1]), int(cr[0])
def getSubContainers(container, lxcpath):
attach = ['lxc-attach', '-R', '-s', 'NETWORK|PID', '-n', container,
'--', sys.argv[0], "--nesting"]
with open(os.devnull, "w") as fd:
newenv = dict(os.environ)
newenv['NESTED'] = "/proc/1/root/%s" % lxcpath
sp = subprocess.Popen(attach, stderr=fd, stdout=subprocess.PIPE,
env=newenv, universal_newlines=True)
sp.wait()
out = sp.stdout.read()
if out:
return json.loads(out)
return None
# Begin parsing the command line
parser = argparse.ArgumentParser(description=_("LXC: List containers"),
formatter_class=argparse.RawTextHelpFormatter)
@ -93,7 +112,8 @@ parser.add_argument("-1", dest="one", action="store_true",
help=_("list one container per line (default when piped)"))
parser.add_argument("-P", "--lxcpath", dest="lxcpath", metavar="PATH",
help=_("Use specified container path"), default=None)
help=_("Use specified container path"),
default=lxc.default_config_path)
parser.add_argument("--active", action="store_true",
help=_("list only active containers "
@ -114,6 +134,9 @@ parser.add_argument("--fancy", action="store_true",
parser.add_argument("--fancy-format", type=str, default="name,state,ipv4,ipv6",
help=_("comma separated list of fields to show"))
parser.add_argument("--nesting", dest="nesting", action="store_true",
help=_("show nested containers"))
parser.add_argument("filter", metavar='FILTER', type=str, nargs="?",
help=_("regexp to be applied on the container list"))
@ -129,6 +152,9 @@ if args.active:
if not sys.stdout.isatty():
args.one = True
# Set the lookup path for the containers
lxcpath = os.environ.get('NESTED', args.lxcpath)
# Turn args.fancy_format into a list
args.fancy_format = args.fancy_format.strip().split(",")
@ -141,7 +167,7 @@ if not os.geteuid() == 0 and (args.fancy or args.state):
# List of containers, stored as dictionaries
containers = []
for container_name in lxc.list_containers(config_path=args.lxcpath):
for container_name in lxc.list_containers(config_path=lxcpath):
entry = {}
entry['name'] = container_name
@ -150,7 +176,7 @@ for container_name in lxc.list_containers(config_path=args.lxcpath):
continue
# Return before grabbing the object (non-root)
if not args.state and not args.fancy:
if not args.state and not args.fancy and not args.nesting:
containers.append(entry)
continue
@ -161,28 +187,47 @@ for container_name in lxc.list_containers(config_path=args.lxcpath):
continue
# Nothing more is needed if we're not printing some fancy output
if not args.fancy:
if not args.fancy and not args.nesting:
containers.append(entry)
continue
# Some extra field we may want
if 'state' in args.fancy_format:
if 'state' in args.fancy_format or args.nesting:
entry['state'] = container.state
if 'pid' in args.fancy_format:
if 'pid' in args.fancy_format or args.nesting:
entry['pid'] = "-"
if container.init_pid != -1:
entry['pid'] = str(container.init_pid)
# Get the IPs
for protocol in ('ipv4', 'ipv6'):
if protocol in args.fancy_format:
if protocol in args.fancy_format or args.nesting:
entry[protocol] = "-"
ips = container.get_ips(protocol=protocol, timeout=1)
if ips:
entry[protocol] = ", ".join(ips)
# Append the container
containers.append(entry)
# Nested containers
if args.nesting:
sub = getSubContainers(container_name, args.lxcpath)
if sub:
for entry in sub:
if 'nesting_parent' not in entry:
entry['nesting_parent'] = []
entry['nesting_parent'].insert(0, container_name)
entry['nesting_real_name'] = entry.get('nesting_real_name',
entry['name'])
entry['name'] = "%s/%s" % (container_name, entry['name'])
containers += sub
# Deal with json output:
if 'NESTED' in os.environ:
print(json.dumps(containers))
sys.exit(0)
# Print the list
## Standard list with one entry per line
@ -226,7 +271,12 @@ if args.fancy:
for container in containers:
for field in args.fancy_format:
if len(container[field]) > field_maxlength[field]:
if field == 'name' and 'nesting_real_name' in container:
fieldlen = len(" " * ((len(container['nesting_parent']) - 1)
* 4) + " \_ " + container['nesting_real_name'])
if fieldlen > field_maxlength[field]:
field_maxlength[field] = fieldlen
elif len(container[field]) > field_maxlength[field]:
field_maxlength[field] = len(container[field])
# Generate the line format string based on the maximum length and
@ -250,5 +300,12 @@ if args.fancy:
# Print the entries
for container in sorted(containers,
key=lambda container: container['name']):
fields = [container[field] for field in args.fancy_format]
fields = []
for field in args.fancy_format:
if field == 'name' and 'nesting_real_name' in container:
prefix = " " * ((len(container['nesting_parent']) - 1) * 4)
fields.append(prefix + " \_ " + container['nesting_real_name'])
else:
fields.append(container[field])
print(line_format.format(fields=fields))

15
src/python-lxc/lxc/__init__.py.in
View File

@ -337,18 +337,9 @@ class Container(_lxc.Container):
Returns the list of IP addresses for the container.
"""
if not self.defined or not self.running:
if not self.running:
return False
try:
os.makedirs("/run/netns")
except:
pass
path = tempfile.mktemp(dir="/run/netns")
os.symlink("/proc/%s/ns/net" % self.init_pid, path)
ips = []
count = 0
@ -356,7 +347,8 @@ class Container(_lxc.Container):
if count != 0:
time.sleep(1)
base_cmd = ["ip", "netns", "exec", path.split("/")[-1], "ip"]
base_cmd = ["lxc-attach", "-s", "NETWORK", "-n", self.name, "--",
"ip"]
# Get IPv6
if protocol in ("ipv6", None):
@ -397,7 +389,6 @@ class Container(_lxc.Container):
count += 1
os.remove(path)
return ips
def get_keys(self, key=None):