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[Bug 1647708] Re: Ephemeral disk on xenial is not mounted at boot

 

** Also affects: cloud-init (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Changed in: cloud-init (Ubuntu Yakkety)
       Status: New => Confirmed

** Changed in: cloud-init (Ubuntu Yakkety)
   Importance: Undecided => Medium

** Changed in: cloud-init (Ubuntu Xenial)
   Importance: Undecided => Critical

** Changed in: cloud-init (Ubuntu Yakkety)
   Importance: Medium => High

** Description changed:

  When I boot the latest xenial Azure image (containing cloud-init
  0.7.8-49-g9e904bb-0ubuntu1~16.04.1), the ephemeral disk does not end up
  mounted (though it is formatted appropriately).  Restarting the
  mnt.mount service does mount it, which suggests there is an issue in the
  ordering of the services at boot.
  
  $ mount | grep mnt
- $ sudo systemctl status mnt.mount 
+ $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
-    Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
-    Active: inactive (dead)
-     Where: /mnt
-      What: /dev/disk/cloud/azure_resource-part1
-      Docs: man:fstab(5)
-            man:systemd-fstab-generator(8)
- $ sudo journalctl -u mnt.mount 
+    Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
+    Active: inactive (dead)
+     Where: /mnt
+      What: /dev/disk/cloud/azure_resource-part1
+      Docs: man:fstab(5)
+            man:systemd-fstab-generator(8)
+ $ sudo journalctl -u mnt.mount
  -- No entries --
- $ cat /etc/fstab 
+ $ cat /etc/fstab
  # CLOUD_IMG: This file was created/modified by the Cloud Image build process
  UUID=6a8554fa-8e1d-4916-ba03-4ca3837feb34	/	 ext4	defaults,discard	0 0
  /dev/disk/cloud/azure_resource-part1	/mnt	auto	defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig	0	2
  $ sudo systemctl restart mnt.mount
  $ mount | grep mnt
  /dev/sdb1 on /mnt type ext4 (rw,relatime,data=ordered)
  $ ls /mnt/
  lost+found
- $ sudo systemctl status mnt.mount 
+ $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
-    Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
-    Active: active (mounted) since Tue 2016-12-06 12:49:06 UTC; 6s ago
-     Where: /mnt
-      What: /dev/sdb1
-      Docs: man:fstab(5)
-            man:systemd-fstab-generator(8)
-   Process: 1916 ExecMount=/bin/mount /dev/disk/cloud/azure_resource-part1 /mnt -o defaults,x-systemd.requires=cloud-init.service,comment=cloudconfig (code=exited, status=0/SUCCESS)
-     Tasks: 0
-    Memory: 88.0K
-       CPU: 15ms
+    Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
+    Active: active (mounted) since Tue 2016-12-06 12:49:06 UTC; 6s ago
+     Where: /mnt
+      What: /dev/sdb1
+      Docs: man:fstab(5)
+            man:systemd-fstab-generator(8)
+   Process: 1916 ExecMount=/bin/mount /dev/disk/cloud/azure_resource-part1 /mnt -o defaults,x-systemd.requires=cloud-init.service,comment=cloudconfig (code=exited, status=0/SUCCESS)
+     Tasks: 0
+    Memory: 88.0K
+       CPU: 15ms
  
  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounting /mnt...
  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounted /mnt.
+ 
+ Related bugs:
+  * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM 
+  * bug 1642383: Unable to configure swap space on ephemeral disk in Azure

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https://bugs.launchpad.net/bugs/1647708

Title:
  Ephemeral disk on xenial is not mounted at boot

Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Confirmed
Status in cloud-init source package in Yakkety:
  Confirmed

Bug description:
  When I boot the latest xenial Azure image (containing cloud-init
  0.7.8-49-g9e904bb-0ubuntu1~16.04.1), the ephemeral disk does not end
  up mounted (though it is formatted appropriately).  Restarting the
  mnt.mount service does mount it, which suggests there is an issue in
  the ordering of the services at boot.

  $ mount | grep mnt
  $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
     Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
     Active: inactive (dead)
      Where: /mnt
       What: /dev/disk/cloud/azure_resource-part1
       Docs: man:fstab(5)
             man:systemd-fstab-generator(8)
  $ sudo journalctl -u mnt.mount
  -- No entries --
  $ cat /etc/fstab
  # CLOUD_IMG: This file was created/modified by the Cloud Image build process
  UUID=6a8554fa-8e1d-4916-ba03-4ca3837feb34	/	 ext4	defaults,discard	0 0
  /dev/disk/cloud/azure_resource-part1	/mnt	auto	defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig	0	2
  $ sudo systemctl restart mnt.mount
  $ mount | grep mnt
  /dev/sdb1 on /mnt type ext4 (rw,relatime,data=ordered)
  $ ls /mnt/
  lost+found
  $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
     Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
     Active: active (mounted) since Tue 2016-12-06 12:49:06 UTC; 6s ago
      Where: /mnt
       What: /dev/sdb1
       Docs: man:fstab(5)
             man:systemd-fstab-generator(8)
    Process: 1916 ExecMount=/bin/mount /dev/disk/cloud/azure_resource-part1 /mnt -o defaults,x-systemd.requires=cloud-init.service,comment=cloudconfig (code=exited, status=0/SUCCESS)
      Tasks: 0
     Memory: 88.0K
        CPU: 15ms

  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounting /mnt...
  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounted /mnt.

  Related bugs:
   * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM 
   * bug 1642383: Unable to configure swap space on ephemeral disk in Azure

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References