[Lxc-users] /proc/<process id>/ns is not found

Dong-In David Kang dkang at isi.edu
Mon Nov 7 02:04:22 UTC 2011


 You're right.
Thanks a lot.

 David.

----------------------
Dr. Dong-In "David" Kang
Computer Scientist
USC/ISI

----- Original Message -----
From: "Greg Kurz" <gkurz at fr.ibm.com>
To: "Dong-In David Kang" <dkang at isi.edu>
Cc: "Cedric Le Goater" <legoater at free.fr>, lxc-users at lists.sourceforge.net
Sent: Friday, November 4, 2011 5:04:34 PM
Subject: Re: [Lxc-users] /proc/<process id>/ns is not found

On Fri, 2011-11-04 at 08:15 -0700, Dong-In David Kang wrote:
> Here is the output of 
> $ lxc-attach -n foo -- ps -ef --forest.
> 
> (I've changed lxc-attach a little bit so that I can provide processor id instead of the name of lxc process.
> I've started the lxc process using libvirt.
> The process id of the lxc process is 4921.)
> 

I'm not familiar with libvirt, but from the ps output below, it appears
that the pid you're interested in is the one running /sbin/init (4922).
It's the first process, with pid 1, in the container. The libvirt_lxc
(4921) process seems to be the container parent.

> 
> [root at gpu2 lxc]# lxc-attach -n 4921 -- ps -ef --forest
> lxc-attach: No such file or directory - failed to exec 'ps'
> [root at gpu2 lxc]# lxc-attach -n 4921 -- /bin/ps -ef --forest
> UID        PID  PPID  C STIME TTY          TIME CMD
> root         2     0  0 Nov03 ?        00:00:00 [kthreadd]
> root         3     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/0]
> root         6     2  0 Nov03 ?        00:00:00  \_ [migration/0]
> root         7     2  0 Nov03 ?        00:00:00  \_ [watchdog/0]
> root         8     2  0 Nov03 ?        00:00:00  \_ [migration/1]
> root         9     2  0 Nov03 ?        00:00:00  \_ [kworker/1:0]
> root        10     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/1]
> root        12     2  0 Nov03 ?        00:00:00  \_ [watchdog/1]
> root        13     2  0 Nov03 ?        00:00:00  \_ [migration/2]
> root        14     2  0 Nov03 ?        00:00:00  \_ [kworker/2:0]
> root        15     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/2]
> root        16     2  0 Nov03 ?        00:00:00  \_ [watchdog/2]
> root        17     2  0 Nov03 ?        00:00:00  \_ [migration/3]
> root        18     2  0 Nov03 ?        00:00:00  \_ [kworker/3:0]
> root        19     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/3]
> root        20     2  0 Nov03 ?        00:00:00  \_ [watchdog/3]
> root        21     2  0 Nov03 ?        00:00:00  \_ [migration/4]
> root        23     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/4]
> root        24     2  0 Nov03 ?        00:00:00  \_ [watchdog/4]
> root        25     2  0 Nov03 ?        00:00:00  \_ [migration/5]
> root        26     2  0 Nov03 ?        00:00:01  \_ [kworker/5:0]
> root        27     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/5]
> root        28     2  0 Nov03 ?        00:00:00  \_ [watchdog/5]
> root        29     2  0 Nov03 ?        00:00:00  \_ [migration/6]
> root        30     2  0 Nov03 ?        00:00:00  \_ [kworker/6:0]
> root        31     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/6]
> root        32     2  0 Nov03 ?        00:00:00  \_ [watchdog/6]
> root        33     2  0 Nov03 ?        00:00:00  \_ [migration/7]
> root        34     2  0 Nov03 ?        00:00:00  \_ [kworker/7:0]
> root        35     2  0 Nov03 ?        00:00:00  \_ [ksoftirqd/7]
> root        36     2  0 Nov03 ?        00:00:00  \_ [watchdog/7]
> root        37     2  0 Nov03 ?        00:00:00  \_ [cpuset]
> root        38     2  0 Nov03 ?        00:00:00  \_ [khelper]
> root        39     2  0 Nov03 ?        00:00:00  \_ [netns]
> root        40     2  0 Nov03 ?        00:00:00  \_ [sync_supers]
> root        41     2  0 Nov03 ?        00:00:00  \_ [bdi-default]
> root        42     2  0 Nov03 ?        00:00:00  \_ [kintegrityd]
> root        43     2  0 Nov03 ?        00:00:00  \_ [kblockd]
> root        44     2  0 Nov03 ?        00:00:00  \_ [ata_sff]
> root        45     2  0 Nov03 ?        00:00:00  \_ [khubd]
> root        46     2  0 Nov03 ?        00:00:00  \_ [md]
> root        47     2  0 Nov03 ?        00:00:00  \_ [kworker/1:1]
> root        48     2  0 Nov03 ?        00:00:01  \_ [kworker/2:1]
> root        49     2  0 Nov03 ?        00:00:00  \_ [kworker/3:1]
> root        50     2  0 Nov03 ?        00:00:02  \_ [kworker/4:1]
> root        52     2  0 Nov03 ?        00:00:01  \_ [kworker/6:1]
> root        53     2  0 Nov03 ?        00:00:00  \_ [kworker/7:1]
> root        54     2  0 Nov03 ?        00:00:00  \_ [khungtaskd]
> root        55     2  0 Nov03 ?        00:00:02  \_ [kswapd0]
> root        56     2  0 Nov03 ?        00:00:00  \_ [ksmd]
> root        57     2  0 Nov03 ?        00:00:00  \_ [khugepaged]
> root        58     2  0 Nov03 ?        00:00:00  \_ [fsnotify_mark]
> root        59     2  0 Nov03 ?        00:00:00  \_ [aio]
> root        60     2  0 Nov03 ?        00:00:00  \_ [crypto]
> root        65     2  0 Nov03 ?        00:00:00  \_ [kthrotld]
> root        67     2  0 Nov03 ?        00:00:00  \_ [kpsmoused]
> root        89     2  0 Nov03 ?        00:00:03  \_ [kworker/0:2]
> root       235     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_0]
> root       236     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_1]
> root       241     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_2]
> root       242     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_3]
> root       243     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_4]
> root       244     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_5]
> root       245     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_6]
> root       246     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_7]
> root       256     2  0 Nov03 ?        00:00:00  \_ [mpt_poll_0]
> root       257     2  0 Nov03 ?        00:00:00  \_ [mpt/0]
> root       258     2  0 Nov03 ?        00:00:00  \_ [scsi_eh_8]
> root       373     2  0 Nov03 ?        00:00:00  \_ [kdmflush]
> root       375     2  0 Nov03 ?        00:00:00  \_ [kdmflush]
> root       400     2  0 Nov03 ?        00:00:04  \_ [jbd2/dm-0-8]
> root       401     2  0 Nov03 ?        00:00:00  \_ [ext4-dio-unwrit]
> root       795     2  0 Nov03 ?        00:00:00  \_ [hd-audio0]
> root       798     2  0 Nov03 ?        00:00:00  \_ [hd-audio1]
> root       799     2  0 Nov03 ?        00:00:00  \_ [hd-audio2]
> root       800     2  0 Nov03 ?        00:00:00  \_ [hd-audio3]
> root       831     2  0 Nov03 ?        00:00:00  \_ [edac-poller]
> root       878     2  0 Nov03 ?        00:00:00  \_ [mlx4]
> root       882     2  0 Nov03 ?        00:00:00  \_ [mlx4_en]
> root       884     2  0 Nov03 ?        00:00:00  \_ [mlx4_ib]
> root       885     2  0 Nov03 ?        00:00:00  \_ [ib_mad1]
> root       886     2  0 Nov03 ?        00:00:00  \_ [ib_mad2]
> root      1079     2  0 Nov03 ?        00:00:00  \_ [kvm-irqfd-clean]
> root      1124     2  0 Nov03 ?        00:00:00  \_ [jbd2/sdb1-8]
> root      1125     2  0 Nov03 ?        00:00:00  \_ [ext4-dio-unwrit]
> root      1126     2  0 Nov03 ?        00:00:00  \_ [loop0]
> root      1185     2  0 Nov03 ?        00:00:00  \_ [kauditd]
> root      1384     2  0 Nov03 ?        00:00:02  \_ [kworker/4:2]
> root      1386     2  0 Nov03 ?        00:00:03  \_ [flush-253:0]
> root      1695     2  0 Nov03 ?        00:00:00  \_ [rpciod]
> root      1764     2  0 Nov03 ?        00:00:00  \_ [nfsiod]
> root      1766     2  0 Nov03 ?        00:00:00  \_ [nfsv4.0-svc]
> root      4279     2  0 Nov03 ?        00:00:00  \_ [kworker/5:2]
> root      4690     2  0 Nov03 ?        00:00:00  \_ [flush-7:1]
> root      4698     2  0 Nov03 ?        00:00:00  \_ [loop1]
> root      4710     2  0 Nov03 ?        00:00:02  \_ [kworker/0:0]
> root     22018     2  0 Nov03 ?        00:00:00  \_ [flush-0:29]
> root     15337     2  0 10:31 ?        00:00:00  \_ [kworker/u:2]
> root     16389     2  0 11:04 ?        00:00:00  \_ [kworker/u:1]
> root     16538     2  0 11:10 ?        00:00:00  \_ [kworker/u:0]
> root         1     0  0 Nov03 ?        00:00:01 /sbin/init
> root       499     1  0 Nov03 ?        00:00:00 /sbin/udevd -d
> root      5265   499  0 Nov03 ?        00:00:00  \_ /sbin/udevd -d
> root      5266   499  0 Nov03 ?        00:00:00  \_ /sbin/udevd -d
> root      1577     1  0 Nov03 ?        00:00:00 auditd
> root      1602     1  0 Nov03 ?        00:00:00 /sbin/rsyslogd -c 4
> root      1627     1  0 Nov03 ?        00:00:16 irqbalance
> rpc       1646     1  0 Nov03 ?        00:00:00 rpcbind
> rpcuser   1664     1  0 Nov03 ?        00:00:00 rpc.statd
> root      1702     1  0 Nov03 ?        00:00:00 rpc.idmapd
> dbus      1732     1  0 Nov03 ?        00:00:00 dbus-daemon --system
> root      1744     1  0 Nov03 ?        00:00:00 cupsd -C /etc/cups/cupsd.conf
> 68        1782     1  0 Nov03 ?        00:00:00 hald
> root      1783  1782  0 Nov03 ?        00:00:00  \_ hald-runner
> root      1811  1783  0 Nov03 ?        00:00:00      \_ hald-addon-input: Listening on /dev/input/event0
> root      1842     1  0 Nov03 ?        00:00:00 /usr/sbin/ypbind
> root      1866     1  0 Nov03 ?        00:00:00 automount --pid-file /var/run/autofs.pid
> root      1885     1  0 Nov03 ?        00:00:00 /usr/sbin/sshd
> root      3408  1885  0 Nov03 ?        00:00:00  \_ sshd: dkang [priv]
> dkang     3487  3408  0 Nov03 ?        00:00:00  |   \_ sshd: dkang at pts/0
> dkang     3489  3487  0 Nov03 pts/0    00:00:00  |       \_ -bash
> root      4531  3489  0 Nov03 pts/0    00:00:00  |           \_ sudo bash
> root      4535  4531  0 Nov03 pts/0    00:00:00  |               \_ bash
> root     16552  4535  0 11:10 pts/0    00:00:00  |                   \_ lxc-attach -n 4921 -- /bin/ps -ef --forest
> root     16553 16552  6 11:10 pts/0    00:00:00  |                       \_ /bin/ps -ef --forest
> root     10234  1885  0 09:04 ?        00:00:00  \_ sshd: dkang [priv]
> dkang    10237 10234  0 09:04 ?        00:00:00  |   \_ sshd: dkang at pts/1
> dkang    10238 10237  0 09:04 pts/1    00:00:00  |       \_ -bash
> root     10259 10238  0 09:04 pts/1    00:00:00  |           \_ sudo bash
> root     10262 10259  0 09:04 pts/1    00:00:00  |               \_ bash
> root     10290 10262  0 09:05 pts/1    00:00:00  |                   \_ vim 0018-add-setns-syscall-for-x86.patch
> root     15490  1885  0 10:36 ?        00:00:00  \_ sshd: mkkang [priv]
> mkkang   15493 15490  0 10:36 ?        00:00:00  |   \_ sshd: mkkang at pts/2
> mkkang   15494 15493  0 10:36 pts/2    00:00:00  |       \_ -bash
> root     15515 15494  0 10:36 pts/2    00:00:00  |           \_ sudo sh
> root     15518 15515  0 10:36 pts/2    00:00:00  |               \_ sh
> root     16142  1885  0 10:57 ?        00:00:00  \_ sshd: lorin [priv]
> lorin    16144 16142  0 10:57 ?        00:00:00      \_ sshd: lorin at pts/3
> lorin    16145 16144  0 10:57 pts/3    00:00:00          \_ -bash
> root      1893     1  0 Nov03 ?        00:00:00 xinetd -stayalive -pidfile /var/run/xinetd.pid
> ntp       1901     1  0 Nov03 ?        00:00:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g
> root      1937     1  0 Nov03 ?        00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql
> mysql     2026  1937  0 Nov03 ?        00:00:40  \_ /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
> root      2117     1  0 Nov03 ?        00:00:00 /usr/libexec/postfix/master
> postfix   2131  2117  0 Nov03 ?        00:00:00  \_ qmgr -l -t fifo -u
> postfix  14889  2117  0 10:14 ?        00:00:00  \_ pickup -l -t fifo -u
> rabbitmq  2145     1  0 Nov03 ?        00:00:00 /usr/lib64/erlang/erts-5.8.1/bin/epmd -daemon
> rabbitmq  2162     1  0 Nov03 ?        00:02:20 /usr/lib64/erlang/erts-5.8.1/bin/beam.smp -W w -K true -A30 -P 1048576 -- -root /usr/lib64/erlang -progname erl -- -home /var/lib/rabbitmq -- -noshell -noinput -sname rabbit at gpu2 -boot /var/lib/ra
> rabbitmq  2238  2162  0 Nov03 ?        00:00:00  \_ /usr/lib64/erlang/lib/os_mon-2.2.5/priv/bin/cpu_sup
> rabbitmq  2241  2162  0 Nov03 ?        00:00:00  \_ inet_gethost 4
> rabbitmq  2242  2241  0 Nov03 ?        00:00:00      \_ inet_gethost 4
> root      2253     1  0 Nov03 ?        00:00:03 /usr/sbin/abrtd
> root      2268     1  0 Nov03 ?        00:00:00 /bin/bash /usr/sbin/ksmtuned
> root     16534  2268  0 11:10 ?        00:00:00  \_ sleep 60
> root      2277     1  0 Nov03 ?        00:00:00 crond
> root      2288     1  0 Nov03 ?        00:00:00 /usr/sbin/atd
> glance    2296     1  0 Nov03 ?        00:00:00 /usr/bin/python /usr/bin/glance-api -d -v --log-config=/etc/glance/logging-api.conf
> glance    2326     1  0 Nov03 ?        00:00:00 /usr/bin/python /usr/bin/glance-registry -d -v --log-config=/etc/glance/logging-registry.conf
> nova      2335     1  1 Nov03 ?        00:11:08 /usr/bin/python /usr/bin/nova-ajax-console-proxy --flagfile=/etc/nova/nova.conf --logfile=/var/log/nova/nova-ajax-console-proxy.log --pidfile /var/run/nova/nova-ajax-console-proxy.pid
> nova      2349     1  0 Nov03 ?        00:00:01 python /usr/local/nova/sandbox/nova/bin/nova-api --flagfile=/usr/local/nova/sandbox/nova/bin/nova.conf --logfile=/var/log/nova/api
> nova      2362     1  0 Nov03 ?        00:00:00 /usr/bin/python /usr/bin/nova-direct-api --flagfile=/etc/nova/nova.conf --logfile=/var/log/nova/nova-direct-api.log --pidfile /var/run/nova/nova-direct-api.pid
> nova      2403     1  0 Nov03 ?        00:00:00 python /usr/local/nova/sandbox/nova/bin/nova-objectstore --flagfile=/usr/local/nova/sandbox/nova/bin/nova.conf --logfile=/var/log/nova/objectstore
> root      2451     1  0 Nov03 ?        00:00:09 libvirtd --daemon
> root      2467     1  0 Nov03 ?        00:00:00 rhnsd
> root      2483     1  0 Nov03 ?        00:00:00 /usr/bin/rhsmcertd 240
> nova      2490     1  0 Nov03 ?        00:05:15 python /usr/local/nova/sandbox/nova//bin/nova-compute --flagfile=/usr/local/nova/sandbox/nova//bin/nova.conf --logfile=/var/log/nova/compute
> nova      4952  2490  0 Nov03 ?        00:00:00  \_ [sh] <defunct>
> nova      4956  2490  0 Nov03 ?        00:00:00  \_ [sh] <defunct>
> nova      4960  2490  0 Nov03 ?        00:00:00  \_ [sh] <defunct>
> nobody    2568     1  0 Nov03 ?        00:00:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.
> root      2668     1  0 Nov03 tty1     00:00:00 /sbin/mingetty /dev/tty1
> root      2670     1  0 Nov03 tty2     00:00:00 /sbin/mingetty /dev/tty2
> root      2672     1  0 Nov03 tty3     00:00:00 /sbin/mingetty /dev/tty3
> root      2676     1  0 Nov03 tty4     00:00:00 /sbin/mingetty /dev/tty4
> root      2680     1  0 Nov03 tty5     00:00:00 /sbin/mingetty /dev/tty5
> root      2682     1  0 Nov03 tty6     00:00:00 /sbin/mingetty /dev/tty6
> root      2691     1  0 Nov03 ?        00:00:00 /usr/libexec/polkit-1/polkitd
> root      2693     1  0 Nov03 ?        00:00:00 /usr/sbin/console-kit-daemon --no-daemon
> nova      4384     1  0 Nov03 ?        00:02:18 python /usr/local/nova/sandbox/nova/bin/nova-network --flagfile=/usr/local/nova/sandbox/nova/bin/nova.conf --logfile=/var/log/nova/network
> nova      4464     1  0 Nov03 ?        00:02:13 python /usr/local/nova/sandbox/nova/bin/nova-scheduler --flagfile=/usr/local/nova/sandbox/nova/bin/nova.conf --logfile=/var/log/nova/scheduler
> nobody    4494     1  0 Nov03 ?        00:00:00 dnsmasq --strict-order --bind-interfaces --conf-file= --domain=novalocal --pid-file=/usr/local/nova/sandbox/nova/networks/nova-br100.pid --listen-address=10.88.1.1 --except-interface=lo --dhcp-ran
> root      4495  4494  0 Nov03 ?        00:00:00  \_ dnsmasq --strict-order --bind-interfaces --conf-file= --domain=novalocal --pid-file=/usr/local/nova/sandbox/nova/networks/nova-br100.pid --listen-address=10.88.1.1 --except-interface=lo --dhcp
> root      4921     1  0 Nov03 ?        00:00:00 /usr/libexec/libvirt_lxc --name instance-00000005 --console 15 --handshake 18 --background --veth veth1
> root      4922  4921  0 Nov03 ?        00:00:00  \_ /sbin/init
> root      4927  4922  0 Nov03 ?        00:00:00      \_ /sbin/agetty -8 38400 /dev/console linux
> root      4933  4922  0 Nov03 pts/0    00:00:00      \_ /sbin/mingetty /dev/tty1
> root      5314  4922  0 Nov03 ?        00:00:00      \_ /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient-eth0.leases -pf /var/run/dhclient-eth0.pid eth0
> root      5405  4922  0 Nov03 ?        00:00:00      \_ /usr/sbin/sshd
> 
> 
> 
> ----------------------
> Dr. Dong-In "David" Kang
> Computer Scientist
> USC/ISI
> 
> ----- Original Message -----
> From: "Cedric Le Goater" <legoater at free.fr>
> To: "Dong-In David Kang" <dkang at isi.edu>
> Cc: "Greg Kurz" <gkurz at fr.ibm.com>, lxc-users at lists.sourceforge.net
> Sent: Friday, November 4, 2011 11:00:47 AM
> Subject: Re: [Lxc-users] /proc/<process id>/ns is not found
> 
> On 11/04/2011 03:37 PM, Dong-In David Kang wrote:
> >   I could build Linux 2.6.83.2 with lxc patches.
> > I could make lxc-0.7.4 work with it.
> > (lxc-0.7.5 did not work.)
> > I mean it doesn't complain any more.
> >
> >   However, I'm not sure if it really works.
> >
> > I did the follwoing:
> >
> > $ lxc-attach -n foo -- /bin/cat /etc/fstab
> >
> > But it shows host's /etc/fstab (not foo's /etc/fstab).
> > I did a few other things.
> > But the outputs are the host's (not the container's).
> >
> 
> what about :
> 
> 	$ lxc-attach -n foo -- ps -ef --forest
> 
> 
> C.
> 

-- 
Gregory Kurz                                     gkurz at fr.ibm.com
Software Engineer @ IBM/Meiosys                  http://www.ibm.com
Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420

"Anarchy is about taking complete responsibility for yourself."
        Alan Moore.





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