yahoo-eng-team team mailing list archive

[Hiroyuki Eguchi <1296532@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Network interface should be restarted if instance has a static ip
address.

Details are as follows.

1. create a instance with specifying a static ip address A.

2. create a snapshot of a instance.

3. create a instance from snapshot with specifying a static ip address
B.

  3.1 instance start (At this time, network interface is still specified to use ip address A.)
  3.2 cloud-init edits /etc/network/interface to use ip address B.
  3.3 cloud-init executes ifup command.
      but network interface has already up, so new network information is not reflected.


We have to modify the _bring_up_interface method like this.

--- cloudinit/distros/__init__.py       2014-02-12 19:56:55 +0000
+++ cloudinit/distros/__init__.py       2014-03-24 05:59:00 +0000
@@ -271,11 +271,13 @@
             util.write_file(self.hosts_fn, contents.getvalue(), mode=0644)

     def _bring_up_interface(self, device_name):
-        cmd = ['ifup', device_name]
-        LOG.debug("Attempting to run bring up interface %s using command %s",
-                   device_name, cmd)
+        cmd_down = ['ifdown', device_name]
+        cmd_up = ['ifup', device_name]
+        LOG.debug("Attempting to restart interface %s using command %s %s",
+                   device_name, cmd_down, cmd_up)
         try:
-            (_out, err) = util.subp(cmd)
+            (_out, down_err) = util.subp(cmd_down)
+            (_out, up_err) = util.subp(cmd_up)

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1296532

Title:
  Network interface should be restarted if instance has a static ip
  address.

Status in Init scripts for use on cloud images:
  New

Bug description:
  Network interface should be restarted if instance has a static ip
  address.

  Details are as follows.

  1. create a instance with specifying a static ip address A.

  2. create a snapshot of a instance.

  3. create a instance from snapshot with specifying a static ip address
  B.

    3.1 instance start (At this time, network interface is still specified to use ip address A.)
    3.2 cloud-init edits /etc/network/interface to use ip address B.
    3.3 cloud-init executes ifup command.
        but network interface has already up, so new network information is not reflected.

  
  We have to modify the _bring_up_interface method like this.

  --- cloudinit/distros/__init__.py       2014-02-12 19:56:55 +0000
  +++ cloudinit/distros/__init__.py       2014-03-24 05:59:00 +0000
  @@ -271,11 +271,13 @@
               util.write_file(self.hosts_fn, contents.getvalue(), mode=0644)

       def _bring_up_interface(self, device_name):
  -        cmd = ['ifup', device_name]
  -        LOG.debug("Attempting to run bring up interface %s using command %s",
  -                   device_name, cmd)
  +        cmd_down = ['ifdown', device_name]
  +        cmd_up = ['ifup', device_name]
  +        LOG.debug("Attempting to restart interface %s using command %s %s",
  +                   device_name, cmd_down, cmd_up)
           try:
  -            (_out, err) = util.subp(cmd)
  +            (_out, down_err) = util.subp(cmd_down)
  +            (_out, up_err) = util.subp(cmd_up)

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