[ubuntu-cloud] Cloud-config and mount points

[Bo Shi]

Doh, misreplied and did not to reply-all.

>    But anyway, within a stable release, that list isn't really going to
> change.  Thats why they're called "Stable".  So for 5 years, you can use
> that user-data on 12.04.  If you move your base to 12.10, you should
> re-check the modules.
>
>   I dont' have a better solution than that for you without thinking more.

That sounds perfectly reasonable and no readily generalizable solution
is obvious to me at the moment either.

In other news, I just noticed a strange problem while playing around
today.  It seems that, using the approach outlined earlier in this
thread, the mount does not show up in 'df'.

  root at ip-10-190-45-202:~# df
  Filesystem     1K-blocks    Used Available Use% Mounted on
  /dev/xvda1      10473644 1157608   8791760  12% /
  udev              838332      12    838320   1% /dev
  tmpfs             338516     172    338344   1% /run
  none                5120       0      5120   0% /run/lock
  none              846288       0    846288   0% /run/shm


I _believe_, though, that it is mounted on /dev/xvda2.  'dmesg' bears this out.


  root at ip-10-190-45-202:~# dmesg | grep -C 3 -n mount

  207-[8123347.096532] Freeing unused kernel memory: 1632k freed
  208-[8123347.097515] Freeing unused kernel memory: 1196k freed
  209-[8123347.145706] udevd[81]: starting version 175
  210:[8123347.319618] EXT4-fs (xvda1): mounted filesystem with
                       ordered data mode. Opts: (null)
  211-[8123348.898046] ADDRCONF(NETDEV_UP): eth0: link is not ready
  212:[8123348.899713] EXT4-fs (xvda1): re-mounted. Opts: (null)
  213-[8123348.963857] udevd[248]: starting version 175
  214-[8123349.151531] acpiphp: ACPI Hot Plug PCI Controller Driver version:
                       0.5
  215-[8123349.849324] init: udev-fallback-graphics main process (344)
                       terminated with status 1
  --
  227-[8123353.741899] Adding 917500k swap on /dev/xvda3.
                       Priority:-1 extents:1 across:917500k SS
  228-[8123353.921278] kjournald starting.  Commit interval 5 seconds
  229-[8123354.015351] EXT3-fs (xvda2): using internal journal
  230:[8123354.015360] EXT3-fs (xvda2): mounted filesystem with ordered
                       data mode
  231-[8123358.096011] init: failsafe main process (619) killed by TERM signal
  232-[8123358.889784] type=1400 audit(1342119604.345:8): apparmor="STATUS"
                       operation="profile_replace" name="/sbin/dhclient"
                       pid=690 comm="apparmor_parser"
  233-[8123358.890262] type=1400 audit(1342119604.345:9): apparmor="STATUS"
                       operation="profile_replace"
                       name="/usr/lib/NetworkManager/nm-dhcp-client.action"
                       pid=690 comm="apparmor_parser"


Also, if I attempt to mount /dev/xvda2 at some random mount point, it
shows up in 'df' and 'lsof' output suggests to me that we're talking
about the same partition.

  root at ip-10-190-45-202:~# mkdir -p /tmp/{root-bind-view,ephemeral1}
  root at ip-10-190-45-202:~# mount /dev/xvda2 /tmp/ephemeral1/


  root at ip-10-190-45-202:~# df
  Filesystem     1K-blocks    Used Available Use% Mounted on
  /dev/xvda1      10473644 1157616   8791752  12% /
  udev              838332      12    838320   1% /dev
  tmpfs             338516     172    338344   1% /run
  none                5120       0      5120   0% /run/lock
  none              846288       0    846288   0% /run/shm
  /dev/xvda2     153899044  192360 145889060   1% /tmp/ephemeral1

  root at ip-10-190-45-202:~# lsof /tmp/ephemeral1/
  COMMAND     PID   USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
  rsyslogd    652 syslog    1w   REG  202,2     3435      15
/var/log/cloud-init.log
  rsyslogd    652 syslog    2w   REG  202,2     4434      16 /var/log/auth.log
  rsyslogd    652 syslog    4w   REG  202,2    26706      17 /var/log/syslog
  rsyslogd    652 syslog    5w   REG  202,2    24818      18 /var/log/kern.log
  bash        944 ubuntu  cwd    DIR  202,2     4096       2 /var/log
  superviso 11716   root    3w   REG  202,2      475 1548290
/var/log/supervisor/supervisord.log
  sudo      11839   root  cwd    DIR  202,2     4096       2 /var/log

  root at ip-10-190-45-202:~# lsof /var/log/
  COMMAND     PID   USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
  rsyslogd    652 syslog    1w   REG  202,2     3435      15
/var/log/cloud-init.log
  rsyslogd    652 syslog    2w   REG  202,2     4434      16 /var/log/auth.log
  rsyslogd    652 syslog    4w   REG  202,2    26706      17 /var/log/syslog
  rsyslogd    652 syslog    5w   REG  202,2    24818      18 /var/log/kern.log
  bash        944 ubuntu  cwd    DIR  202,2     4096       2 /var/log
  superviso 11716   root    3w   REG  202,2      475 1548290
/var/log/supervisor/supervisord.log
  sudo      11839   root  cwd    DIR  202,2     4096       2 /var/log


  root at ip-10-190-45-202:~# diff /tmp/ephemeral1/dmesg /var/log/dmesg
  root at ip-10-190-45-202:~#

  root at ip-10-190-45-202:~# sudo mount --bind / /tmp/root-bind-view/
  root at ip-10-190-45-202:~# ls -l /tmp/root-bind-view/var/log
  total 8
  -rw-r--r-- 1 syslog adm  2687 Jul 12 18:59 cloud-init.log