How to group machines

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This article explains several ways to group machines, including availability zones, resource pools, tags, and annotations.

Availability zones

Availability zones in MAAS aid in fault tolerance, service performance, and power management. They can represent different physical or network areas, helping to assign resources efficiently and manage system workload and energy consumption.

List availability zones

To see a list of availability zones:

  • In the MAAS UI, select AZs from the top tab bar.

  • Via the MAAS CLI, enter the following command:

    maas $PROFILE zones read \
    | jq -r '(["ZONE","NAME","DESCRIPTION"]
    | (., map(length*"-"))), (.[] | [.id, .name, .description])
    | @tsv' | column -t

which produces output similar to:

    ZONE  NAME         DESCRIPTION
    ----  ----         -----------
    5     BizOffice
    1     default
    4     Inventory
    2     Medications
    3     Payroll
    6     ProServ

Add an availability zone

To create an availability zone:

  • In the MAAS UI, select AZs > Add AZ > enter Name,Description > Add AZ.

  • Via the CLI, enter the following command:

    maas $PROFILE zones create name=$ZONE_NAME description=$ZONE_DESCRIPTION

Edit an availability zone

To edit an availability zone:

  • In the MAAS UI, select AZs > > Edit > Update Name,Description > Update AZ.

  • Via the MAAS CLI, enter a command similar to the following:

    maas $PROFILE zone update $OLD_ZONE_NAME name=$NEW_ZONE_NAME \
    description=$ZONE_DESCRIPTION

Delete an availability zone

To delete an availability zone:

  • In the MAAS UI, select AZs > > Delete AZ > Delete AZ.

  • Via the MAAS CLI, enter a command like this:

    maas $PROFILE zone delete $ZONE_NAME

Assign a machine to an availability zone

To assign a machine to an availability zone:

  • In the MAAS 3.4 UI, select Machines > choose machines > Categorise > Set zone > choose Zone > Set zone for machine.

  • With the UI for all other MAAS versions, select Machines > choose machines > Take action > Set zone > choose Zone > Set zone for machine.

  • Via the MAAS CLI, first retrieve the machine’s system ID like this:

    maas PROFILE machines read | jq '.[] | .hostname, .system_id'

Then enter the following command, using the system ID you just retrieved:

    maas admin machine update $SYSTEM_ID zone=$ZONE_NAME

Deploy a machine in a particular zone (CLI)

To deploy in a particular zone:

  1. First acquire the machine, assigning it to the particular zone:
    maas $PROFILE machines allocate zone=$ZONE_NAME system_id=$SYSTEM_ID
  1. Then deploy the machine as normal:
    maas $PROFILE machine deploy system_id=$SYSTEM_ID

Resource pools

Administrators can manage MAAS resource pools to group machines in sensible ways. All MAAS installations have a resource pool named “default,” to which MAAS automatically adds new machines.

Add a resource pool

To add a resource pool to MAAS:

  • In the MAAS 3.4 UI, choose Organisation > Pools > Add pool; enter Name and Description; select Save pool.

  • With the UI in all other versions of MAAS, choose Resource > Add pool; enter Name and Description; select Add pool.

  • Via the MAAS CLI, use the following command:

    maas $PROFILE resource-pools create name=$NAME description="$DESCRIPTION"

Delete a resource pool

If you delete a resource pool, all machines that belong to that resource pool will return to the default pool. There is no confirmation dialogue; pools are deleted immediately. To delete a resource pool:

  • In the MAAS 3.4 UI, choose Organisation > Pools > trash can > Delete.

  • With the UI in all other versions of MAAS, choose Resource > (trash can) > Delete.

  • Via the MAAS CLI, use the following command:

    maas $PROFILE resource-pool delete $RESOURCE_POOL_ID

Add a machine to a pool

To add a machine to a resource pool:

  • In the MAAS 3.4 UI, choose Machines > (machine) > Categorise > Set pool > Select pool > Resource pool > Set pool.

  • With the UI in all other versions of MAAS, choose Machines > (machine) > Configuration (resource pool) > Save changes.

  • Via the MAAS CLI, use the following command:

    maas $PROFILE machine update $SYSTEM_ID pool=$POOL_NAME

Remove a machine from a pool

To remove a machine from a resource pool:

  • In the MAAS 3.4 UI, choose Machines > (machine) > Categorise > Set pool > Select pool > Resource pool >“default” > Set pool.

  • With the UI in all other versions of MAAS, choose Machines > (machine) > Configuration > “default” > Save changes.

  • Via the MAAS CLI, use the following command:

    maas $PROFILE machine update $SYSTEM_ID pool="default"

Add a VM host to a pool

To add a VM host to a resource pool:

  • In the MAAS 3.4 UI, choose KVM > LXD > (VM host) > KVM host settings > Resource pool > Save changes.

With the UI in all other versions of MAAS, you can add a VM host to a resource pool when you create a new VM host, or you can edit the VM host’s configuration:

image

  • Via the MAAS CLI, use the following command:
    maas $PROFILE machine update $SYSTEM_ID pool=$POOL_NAME

Remove a VM host from a pool

To remove a VM host from a resource pool:

  • In the MAAS 3.4 UI, choose KVM > LXD > (VM host) > KVM host settings > Resource pool > “default” > Save changes.

  • With the UI in all other versions of MAAS, edit the VM host’s configuration and assign it to the “default” resource pool:

image

  • Via the MAAS CLI, use the following command:
    maas $PROFILE machine update $SYSTEM_ID pool="default"

List resource pools (CLI)

Via the MAAS CLI, use the following command:

maas $PROFILE resource-pools read

List a single pool

Via the MAAS CLI, use the following command:

maas $PROFILE resource-pool read $RESOURCE_POOL_ID

Update a pool

Via the MAAS CLI, use the following command:

maas $PROFILE resource-pool update $RESOURCE_POOL_ID name=newname description="A new description."

The description field is optional.

Tags and annotations

MAAS also offers methods to label machines at all life-cycle stages, including static tags, notes, and dynamic annotations.

General use of tags

Besides machine tags, there are several speciality tags. This section explains how to work with any type of tag.

Naming tags

When working with tags, there are some universal rules you need to follow:

  1. Tag names can include any combination of alphabetic letters (a-zA-Z), numbers (0-9), dashes (-) and underscores (_).
  2. Tag names can be a maximum of 256 characters in length.
  3. Tag names cannot include spaces.

In general, names that do not conform to these rules cannot be created.

Download H/W info (UI)

To download hardware configuration information in XML format, select Machines > machine (allocated or deployed) > Logs > Installation output > Download > Machine output (XML)

You can learn more about the returned information^ if desired. Note that:

  • Size and capacity can have various meanings depending on the device
  • The size of a node is always equal to its capacity
  • Serial refers to the device’s serial number, but is used to report the MAC address for network devices, GUID for disk partition.

You can also find device classes from the same sources.

Adding tags (3.2++/UI)

In the MAAS UI, creating and assigning tags is a combined operation; that is, you create tags as you assign them, rather than creating them first. Creating tags in the UI is a little different user experience: there is a self-loading completion menu that collects all tags of a similar type. This completion menu helps you avoid misspelling tags when entering them more than once; otherwise, you might not be able to group and filter tags properly. It also makes tag entry more efficient.

To create and assign a tag to specific machines, select Machines > machine > Take action > Tag. In the pop-up tag dialogue, enter your proposed tag name in Search existing or add new tags, then select Create tag {tag-name}. Fill in the form:

  • Optionally enter a Comment.

  • Optionally enter Kernel options.

Select Create and add to tag changes > Save. You can confirm your changes by hovering over the Tags list in the Machines screen.

Adding tags (3.1–/UI)

In the MAAS UI, creating and assigning tags is a combined operation; that is, you create tags as you assign them, rather than creating them first. Creating tags in the UI is a little different user experience: there is a self-loading completion menu that collects all tags of a similar type. This completion menu helps you avoid misspelling tags when entering them more than once; otherwise, you might not be able to group and filter tags properly. It also makes tag entry more efficient.

The process for creating and assigning tags in the UI is generally the same for all tag types: Enter the name of the tag in the *Tags box and press the return key. Select the appropriate completion button to register your changes. The tag you just entered will now be added to the tag auto complete list, in alphabetical order, for re-use with other machines.

Adding tags (CLI)

With the CLI, you can create a tag with the following command:

maas $PROFILE tags create name=$TAG_NAME comment='$TAG_COMMENT'

For example, depending upon your system configuration, you might type a command similar to this one:

maas admin tags create name="new_tag" comment="a new tag for test purposes"

When the command is successful, you should see output similar to this:

Success.
Machine-readable output follows:
{
    "name": "new_tag",
    "definition": ",
    "comment": "a new tag for test purposes",
    "kernel_opts": ",
    "resource_uri": "/MAAS/api/2.0/tags/new_tag/"
}

Kernel option tags

This feature is only available via the MAAS CLI.

You can create tags with embedded kernel boot options. When you apply such tags to a machine, those kernel boot options will be applied to that machine on the next deployment.

To create a tag with embedded kernel boot options, use the following command:

maas $PROFILE tags create name='$TAG_NAME' \
    comment='$TAG_COMMENT' kernel_opts='$KERNEL_OPTIONS'

For example:

maas admin tags create name='nomodeset_tag' \
    comment='nomodeset_kernel_option' kernel_opts='nomodeset vga'

This command yields the following results:

Success.
Machine-readable output follows:
{
    "name": "nomodeset_tag",
    "definition": ",
    "comment": "nomodeset_kernel_option",
    "kernel_opts": "nomodeset vga",
    "resource_uri": "/MAAS/api/2.0/tags/nomodeset_tag/"
}

You can check your work with a modified form of the listing command:

maas admin tags read | jq -r \
'(["tag_name","tag_comment","kernel_options"]
|(.,map(length*"-"))),(.[]|[.name,.comment,.kernel_opts]) 
| @tsv' | column -t

This should give you results something like this:

tag_name             tag_comment                  kernel_options                     
--------             -----------                  --------------                     
virtual                                                                              
new_tag              a-new-tag-for-test-purposes                                     
pod-console-logging  console=tty1                 console=ttyS0                      
nomodeset_tag        nomodeset_kernel_option      nomodeset       vga

Removing tags (3.2++/UI)

You have two choices when it comes to eliminating tags from machines in your MAAS instance: you can delete them from all machines, or simply remove them from specific machines.

Deleting tags from all machines at once

To delete tags from all machines, select Machines > Tags > trash can icon > Delete. The tag will be unassigned from all machines and deleted. There is no undo.

Removing a tag from specific machines

To remove a tag only from specific machines, select Machines > machine(s) by checkbox > Take action > Tag. For each tag you wish to unassign, select Remove. When done, select Save to finalise your changes.

Removing tags (3.1–/UI)

With the MAAS UI, you remove tags, rather than explicitly deleting them. Tags are “deleted” when you have removed them from all machines:

  1. Find the Tags box.

  2. Click the X next to the tag you wish to remove.

  3. When you’re done, select the appropriate completion button to register your changes.

Note that the tag you just removed will be deleted from the tag auto complete list when it is no longer assigned to any machines.

Removing tags (CLI)

With the CLI, you can delete a tag with the following command:

maas $PROFILE tag delete $TAG_NAME

For example, depending upon your system configuration, you might type a command similar to this one:

maas admin tag delete zorko

When the command is successful, you should see output similar to this:

Success.
Machine-readable output follows:

Note that there is no actual “Machine-readable output” produced by this command, in most cases. Also note that remove a tag removes it from any nodes where you may have assigned it, but does not affect those nodes in any other way.

Unassign tags (UI)

To unassign tags from machines:

  1. Select Machines.

  2. Select the checkbox(es) next to the machine(s) you wish to untag.

  3. Select Take action > Tag. A table of tags appears at the top of the screen.

  4. For each tag you wish to unassign, select Remove. The text will change to Discard with an X to the right.

  5. If you want to undo a choice before saving, click the X to right of Discard to undo the proposed change.

  6. When you’re satisfied with your new tag configuration, select Save to finalise and register your choice(s).

Automatic tags cannot be unassigned manually. You can either update or delete automatic tags.

You can also unassign tags individually by going to Machines >> {machine-name} >> Configuration >> Tags >> Edit. The Tags table functions exactly the same as what’s described above.

List tagged nodes

To see how many nodes (Machines, controllers, devices) are tagged, search for GRUB_CMDLINE_LINUX_DEFAULT in the “Installation output” tab of the machine details page. That log should stay around for the lifetime of the deployment of the machine. The log gets overwritten when you redeploy the machine. For example:

GRUB_CMDLINE_LINUX_DEFAULT="sysrq_always_enabled dyndbg='file drivers/usb/* +p' console=tty1 console=ttyS0"

Update tags

This feature is only available via the MAAS CLI.

You can update a tag (e.g., a tag comment) like this:

maas $PROFILE tag update $TAG_NAME comment='$TAG_COMMENT'

For example:

maas admin tag update new_tag comment="a-new-tag-for-test-purposes"

This should return an output similar to this one:

Success.
Machine-readable output follows:
{
    "name": "new_tag",
    "definition": ",
    "comment": "a-new-tag-for-test-purposes",
    "kernel_opts": ",
    "resource_uri": "/MAAS/api/2.0/tags/new_tag/"
}

List all tags

This feature is only available via the MAAS CLI.

You can list all tags that currently exist in this MAAS with a command of the form:

maas $PROFILE tags read | jq -r '(["tag_name","tag_comment"]|(.,map(length*"-"))),(.[]|[.name,.comment]) | @tsv' | column -t

For example:

maas admin tags read | jq -r '(["tag_name","tag_comment"]|(.,map(length*"-"))),(.[]|[.name,.comment]) | @tsv' | column -t

Your output might look like this:

tag_name  tag_comment
--------  -----------
virtual   
new_tag   a-new-tag-for-test-purposes

Rebuild a tag

This feature is only available via the MAAS CLI.

If you need to update tags for all machines – without having to recommission them – you can accomplish this with the rebuild command:

maas $PROFILE tag rebuild $TAG

This command automatically applies the tag to all machines regardless of state, even machines that are actively deployed. For example:

maas admin tag rebuild virtual

This command would produce output similar to the following:

Success.
Machine-readable output follows:
{
    "rebuilding": "virtual"
}

Automatic tags

MAAS 3.2 and above provide greatly expanded tagging capability (through the UI only). You can auto-apply tags to machines that match a custom XPath expression. Setting up an automatic tag lets you recognise special hardware characteristics and settings, e.g., the gpu passthrough.

Creating automatic tags (3.4)

To create automatic tags, select Organisation > Tags > Create new tag and fill in the form:

  • Enter the Tag name.

  • Optionally enter a Comment.

  • Optionally enter Kernel options.

  • Enter an XPath-based Definition. A tag is considered automatic when the definition field is filled with an XPath expression. The current version of our UI will only validate if your XPath expression is valid or not, but it will not show you which machines it will apply to before you create the tag.

When done, select Save to register your changes. Once an automatic tag is created the screen will initially show that 0 machines are tagged. That is because MAAS is running a background task to auto-apply the tag to matching machines. It can take some time to see that the number of machines tagged is populating.

Pro tip: Kernel options will be applied at boot time. So by default kernel options will not be applied to any machines until they are deployed. If machines are deployed before they are tagged, the kernel option will be applied when these machines are redeployed.

Change tag definitions

To change tag definitions:

  1. Select Organisation > Tags.

  2. Select the pencil icon on the right end of the tag’s row.

  3. Edit the Definition.

  4. Select Save to register your changes.

Keep in mind that when a new definition is updated, MAAS will re-tag all the machines that match with the new definition. This can take some time, since it is a background process.

Creating automatic tags (3.3/3.2)

To create automatic tags, select Machines > Tags > Create new tag and fill in the form:

  • Enter the Tag name.

  • Optionally enter a Comment.

  • Optionally enter Kernel options.

  • Enter an XPath-based Definition. A tag is considered automatic when the definition field is filled with an XPath expression. The current version of our UI will only validate if your XPath expression is valid or not, but it will not show you which machines it will apply to before you create the tag.

Select Save to register your changes. Once an automatic tag is created the screen will initially show that 0 machines are tagged. That is because MAAS is running a background task to auto-apply the tag to matching machines. It can take some time to see that the number of machines tagged is populating.

Kernel options will be applied at boot time. So, by default, kernel options will not be applied to any machines until they are deployed. If machines are deployed before they are tagged, the kernel option will be applied when these machines are redeployed.

Update tag definitions (UI)

To update tag definitions:

  1. Select Machines > Tags.

  2. Select the pencil icon on the right end of the tag’s row.

  3. Edit the Definition.

  4. Select Save to register your changes.

Keep in mind that when a new definition is updated, MAAS will re-tag all the machines that match with the new definition. This can take some time, since it is a background process.

Update tag kernel options

This feature is only available via the MAAS UI.

To update the kernel options on a tag:

  1. Select Machines > Tags.

  2. Select the pencil icon on the right end of the tag’s row.

  3. Edit the Kernel options.

  4. Select Save to register your changes.

Kernel options can exist for both manual and automatic tags. However, they will be applied during boot time (commissioning and deploying).

If the tagged machines are deployed, the updated kernel option won’t apply until the machines are redeployed. We suggest that you release those machines prior to the update, then redeploy those machines when the kernel options of the tag are updated.

Specifics for machine tags

Machine tags are by far the most commonly used tag type in MAAS. This section reiterates some specifics for managing machine tags.

Assign machine tags (3.4/UI)

If you want to create a new tag, and simultaneously assign it to one or more machines, select Machines > machine(s) (checkbox) > Categorise > Tag. Create and/or assign the tag, and then Save your work.

Assign machine tags (3.3–/UI)

If you want to create a new tag, and simultaneously assign it to one or more machines, select Machines > machine(s) (checkbox) > Take action > Tag. Create and/or assign the desired tag, and select Tag machine to register your changes.

Assign machine tags (CLI)

You can assign tags to a physical or virtual machine with the following command:

maas $PROFILE tag update-nodes $TAG_NAME add=$SYSTEM_ID

For example:

maas admin tag update-nodes new_tag add=g6arks

This returns something like the following:

Success.
Machine-readable output follows:
{
   "added": 1,
   "removed": 0
}

You can check your work by listing machine tags, like this:

maas admin machines read | jq -r \
'(["hostname","sysid","machine_tags"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.tag_names[]])
| @tsv' | column -t

This should yield output similar to the following:

hostname       sysid   machine_tags
--------       -----   ------------
divine-stork   8b3ypp  pod-console-logging  virtual
casual-prawn   4end6r  pod-console-logging  virtual
driven-teal    tgaat6  pod-console-logging  virtual
immune-beetle  43xand  pod-console-logging  virtual
good-osprey    napfxk  pod-console-logging  virtual
smart-hen      c4rwq7  pod-console-logging  virtual
boss-satyr     xn8taa  pod-console-logging  androko
golden-martin  8fxery  pod-console-logging  virtual
crack-guinea   qk4b3g  pod-console-logging  virtual
finer-leech    cy3dtr  pod-console-logging  virtual
free-mouse     gxtbq4  pod-console-logging  virtual
humble-bunny   srqnnb  pod-console-logging  virtual
wanted-muskox  ekw7fh  pod-console-logging  virtual
one-boa        by477d  pod-console-logging  virtual
great-urchin   srnx4g  pod-console-logging  virtual
ace-frog       g6arwg  pod-console-logging  virtual  barbar  farquar  new_tag
alive-marlin   gbwnfb  pod-console-logging  virtual
picked-parrot  am77wn  pod-console-logging  virtual
tough-kit      ke3wc7  pod-console-logging  virtual
legal-whale    8nq3mt  pod-console-logging  virtual
game-sponge    76pdc6  pod-console-logging  virtual
fun-ghoul      qxfm7k  pod-console-logging  virtual
aware-earwig   8m8hs7  pod-console-logging  virtual
chief-crane    7fapx7  pod-console-logging  virtual
select-tapir   4ascbr  pod-console-logging  virtual
on-slug        snfs8d  pod-console-logging  virtual
polite-llama   dbqd4m  pod-console-logging  virtual
frank-coyote   wcmk48  pod-console-logging  virtual
usable-condor  ed8hmy  pod-console-logging  virtual
still-imp      h6ra6d  pod-console-logging  virtual

Remove machine tags (3.4/UI)

To remove machine tags from a machine, select Machines > machine > Machine summary > Tags > Edit and remove the tag.

Remove machine tags (3.3–/UI)

To remove machine tags from a machine, select Machines > machine > Machine summary > Tags > Configuration > Edit and remove the tag.

Remove machine tags (CLI)

You can remove a tag from a physical or virtual machine with this command:

maas $PROFILE tag update-nodes $TAG_NAME remove=$SYSTEM_ID

For example:

maas admin tag update-nodes new_tag remove=g6arwg

This would produce output similar to the following:

Success.
Machine-readable output follows:
{
    "added": 0,
    "removed": 1
}

A quick check to verify results should yield something like this:

hostname       sysid   machine_tags
--------       -----   ------------
ace-frog       g6arwg  pod-console-logging  virtual  barbar  farquar

Change tags for multiple machines

This functionality can only be accessed via the MAAS CLI.

You can simultaneously add and remove tags from multiple machines, as long as you are only modifying one tag, with a command like this one:

maas $PROFILE tag update-nodes $TAG_NAME add=$SYSTEM_ID1 add=$SYSTEM_ID2 remove=$SYSTEM_ID3

For example, to remove the tag “barbar” from machine “g6arwg,” but add it to machines “8fxery” and “by477d,” you could use a command like this:

maas admin tag update-nodes barbar add=8fxery add=by477d remove=g6arwg

This compound operation would yield a response similar to this:

Success.
Machine-readable output follows:
{
    "added": 2,
    "removed": 1
}

Again, verifying by checking the list of machine tags, we enter a command like this:

maas admin machines read | jq -r \
'(["hostname","sysid","machine_tags"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.tag_names[]])
| @tsv' | column -t

The resulting response looks something like this:

hostname       sysid   machine_tags
--------       -----   ------------
divine-stork   8b3ypp  pod-console-logging  virtual
casual-prawn   4end6r  pod-console-logging  virtual
driven-teal    tgaat6  pod-console-logging  virtual
immune-beetle  43xand  pod-console-logging  virtual
good-osprey    napfxk  pod-console-logging  virtual
smart-hen      c4rwq7  pod-console-logging  virtual
boss-satyr     xn8taa  pod-console-logging  androko
golden-martin  8fxery  pod-console-logging  virtual  barbar
crack-guinea   qk4b3g  pod-console-logging  virtual
finer-leech    cy3dtr  pod-console-logging  virtual
free-mouse     gxtbq4  pod-console-logging  virtual
humble-bunny   srqnnb  pod-console-logging  virtual
wanted-muskox  ekw7fh  pod-console-logging  virtual
one-boa        by477d  pod-console-logging  virtual  barbar
great-urchin   srnx4g  pod-console-logging  virtual
ace-frog       g6arwg  pod-console-logging  virtual  farquar
alive-marlin   gbwnfb  pod-console-logging  virtual
picked-parrot  am77wn  pod-console-logging  virtual
tough-kit      ke3wc7  pod-console-logging  virtual
legal-whale    8nq3mt  pod-console-logging  virtual
game-sponge    76pdc6  pod-console-logging  virtual
fun-ghoul      qxfm7k  pod-console-logging  virtual
aware-earwig   8m8hs7  pod-console-logging  virtual
chief-crane    7fapx7  pod-console-logging  virtual
select-tapir   4ascbr  pod-console-logging  virtual
on-slug        snfs8d  pod-console-logging  virtual
polite-llama   dbqd4m  pod-console-logging  virtual
frank-coyote   wcmk48  pod-console-logging  virtual
usable-condor  ed8hmy  pod-console-logging  virtual
still-imp      h6ra6d  pod-console-logging  virtual

List machine tags (3.4/UI)

In the MAAS UI, you don’t explicitly list all machine tags; instead, you filter by them using the “Filters” drop-down. Select Machines > Filters > Tags and click on one or more tag names. The machine list will automatically filter by (be limited to) the machines matching the selected tag(s). Remove a tag from the search filter by deselecting it in the Tags section.

List machine tags (3.3–/UI)

In the MAAS UI, you don’t explicitly list all machine tags; instead, you filter by them using the “Filter by” drop-down. This filtered list does not distinguish between virtual machines (VMs) and physical machines, unless you’ve assigned tags to help with that distinction.

Here’s how you can filter the machine list by machine tags, using the MAAS UI:

  • To list all tags, visit the ‘Machines’ tab and expand the ‘Tags’ subsection in the left pane. In this view, you can use tags as machine search filters.

  • Select one or several tags. The machines that satisfy all selected tags will display on the right pane. Notice there is a search field at the top of the right pane. You can type a search expression into this field.

Below, tag ‘virtual’ has been selected (with the mouse), and the search field automatically reflects this. Five machines satisfy this search filter.

image

Remove a tag from the search filter by either hitting the ‘x’ character alongside a tag or editing the search expression.

List machine tags (CLI)

To list machine tags for all physical and virtual machines, just enter a command similar to this one:

maas $PROFILE machines read | jq -r '(["hostname","sysid","machine_tags"]|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.tag_names[]]) | @tsv' | column -t

For example:

maas admin machines read | jq -r \
'(["hostname","sysid","machine_tags"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.tag_names[]])
| @tsv' | column -t

This gives us a listing similar to this:

hostname       sysid   machine_tags
--------       -----   ------------
divine-stork   8b3ypp  pod-console-logging  virtual
casual-prawn   4end6r  pod-console-logging  virtual
driven-teal    tgaat6  pod-console-logging  virtual
immune-beetle  43xand  pod-console-logging  virtual
good-osprey    napfxk  pod-console-logging  virtual
smart-hen      c4rwq7  pod-console-logging  virtual
boss-satyr     xn8taa  pod-console-logging  androko
golden-martin  8fxery  pod-console-logging  virtual  barbar
crack-guinea   qk4b3g  pod-console-logging  virtual
finer-leech    cy3dtr  pod-console-logging  virtual
free-mouse     gxtbq4  pod-console-logging  virtual
humble-bunny   srqnnb  pod-console-logging  virtual
wanted-muskox  ekw7fh  pod-console-logging  virtual
one-boa        by477d  pod-console-logging  virtual  barbar
great-urchin   srnx4g  pod-console-logging  virtual
ace-frog       g6arwg  pod-console-logging  virtual  farquar
alive-marlin   gbwnfb  pod-console-logging  virtual
picked-parrot  am77wn  pod-console-logging  virtual
tough-kit      ke3wc7  pod-console-logging  virtual
legal-whale    8nq3mt  pod-console-logging  virtual
game-sponge    76pdc6  pod-console-logging  virtual
fun-ghoul      qxfm7k  pod-console-logging  virtual
aware-earwig   8m8hs7  pod-console-logging  virtual
chief-crane    7fapx7  pod-console-logging  virtual
select-tapir   4ascbr  pod-console-logging  virtual
on-slug        snfs8d  pod-console-logging  virtual
polite-llama   dbqd4m  pod-console-logging  virtual
frank-coyote   wcmk48  pod-console-logging  virtual
usable-condor  ed8hmy  pod-console-logging  virtual
still-imp      h6ra6d  pod-console-logging  virtual

View machine tags (3.4/UI)

To view the tags assigned to a specific machine, select Machines > machine > Configuration > Tags.

View machine tags (3.3–/UI)

To view the tags assigned to a specific machine, use the following procedure:

  • On the machine list, select the machine of interest by clicking on its name.

  • On the machine detail screen that comes up, look for the tags on one of the cards presented there: the tags for that machine should be listed there.

View machine tags (CLI)

To view tags for one physical or machine, you can enter a command like this:

maas $PROFILE machine read $SYSTEM_ID | jq -r '(["hostname","sysid","machine_tags"]|(.,map(length*"-"))),([.hostname,.system_id,.tag_names[]]) | @tsv' | column -t

For example:

maas admin machine read 8fxery | jq -r \
'(["hostname","sysid","machine_tags"]
|(.,map(length*"-"))),([.hostname,.system_id,.tag_names[]])
| @tsv' | column -t

Typical output from this command might look like this:

hostname       sysid   machine_tags
--------       -----   ------------
golden-martin  8fxery  pod-console-logging  virtual  barbar

Discover your virtual machine host ID

This functionality is available only through the MAAS CLI.

If you don’t know your VM host ID, you can discover it with this command:

maas $PROFILE vmhosts read \
| jq -r '(["vm_host_name","id"]
|(.,map(length*"-"))),(.[]|[.name,.id])
| @tsv' | column -t

For example:

maas admin vmhosts read \
| jq -r '(["vm_host_name","id"]
|(.,map(length*"-"))),(.[]|[.name,.id])
| @tsv' | column -t

This should produce output similar to the following:

vm_host_name      id
------------      --
my-lxd-vm-host-1  1

Assign tags to a VM host

This functionality is available only through the MAAS CLI.

To assign a tag to a virtual machine host, enter the following command:

maas $PROFILE vmhost add-tag $VMHOST_ID	tag=$TAG_NAME

If you don’t know the ID of your VM host, you can look it up beforehand.

As an example of assigning a tag to a VM host:

maas admin vmhost add-tag 1 tag=virtual

If it worked, this should return Success, followed by the JSON that describes the VM host.

Remove VM host tags

This functionality is available only through the MAAS CLI.

To remove a tag from a virtual machine host, enter the following command:

maas $PROFILE vmhost remove-tag $VMHOST_ID tag=$TAG_NAME

If you don’t know the ID of your VM host, you can look it up beforehand.

As an example of removing a tag from a VM host:

maas admin vmhost remove-tag 1 tag=virtual

If it worked, this should return Success, followed by the JSON that describes the VM host.

List VM host tags

This functionality is available only through the MAAS CLI.

You can list tags for all VM hosts with the following command:

maas $PROFILE vmhosts read | jq -r '(["vm_host_name","id","tags"]|(.,map(length*"-"))),(.[]|[.name,.id,.tags[]]) | @tsv' | column -t

For example:

maas admin vmhosts read | jq -r '(["vm_host_name","id","tags"]|(.,map(length*"-"))),(.[]|[.name,.id,.tags[]]) | @tsv' | column -t

This should yield output similar to the following:

vm_host_name      id  tags
------------      --  ----
my-lxd-vm-host-1  1   morkopongo  pod-console-logging  virtual

View VM host tags (3.4/UI)

To view the machine tags assigned to a VM host, select KVM > VM host type > VM host > KVM host settings > Tags. You can also edit, add, or delete tags from this view. Note that you can only see the tags for a VM host in the same place that you change it. For a more comprehensive list of VM host tags, use the MAAS CLI.

View VM host tags (3.3–/UI)

To view the machine tags assigned to a VM host, select KVM > VM host > KVM host settings > *Tags. You can also edit, add, or delete tags from this view. Note that you can only see the tags for a VM host in the same place that you change it. For a more comprehensive list of VM host tags, use the MAAS CLI.

View VM host tags (CLI)

If you want to list the tags for just one VM host, you can use a command like this one:

maas $PROFILE vmhost read $VMHOST_ID \
| jq -r '(["name","id","tags"]
|(.,map(length*"-"))),([.name,.id,.tags[]])
| @tsv' | column -t

If you don’t know the ID of your VM host, you can look it up beforehand.

As an example of viewing tags for one VM host:

maas admin vmhost read 1 | jq -r '("name","id","tags"]|(.,map(length*"-"))),([.name,.id,.tags[]]) | @tsv' @ column -t

Typical output might look something like this:

name              id  tags
----              --  ----
my-lxd-vm-host-1  1   morkopongo  pod-console-logging

Annotations

Annotations in MAAS are potent tools for adding context and metadata to your machines. They act as supplementary data that allow you to identify, filter, and manage your machines more effectively. Essentially, annotations fall into two categories:

  1. Notes: These are always available, regardless of the machine’s state.
  2. Dynamic Annotations: These only exist when a machine is in an allocated or deployed state.

This section explains how to use notes and dynamic annotations.

Dynamic annotations aren’t supported in MAAS version 2.9 or earlier.

Notes

Notes are persistent descriptions that stay with a machine throughout its life-cycle unless manually altered. You can manage notes through both the MAAS UI and CLI.

Notes via UI

To add or modify notes via the MAAS UI:

  1. Navigate to Machines > Machine name > Configuration > Edit.

  2. Your existing notes appear in the Note section.

  3. Add new or modify existing notes in the Note section.

  4. Delete irrelevant notes from the same block.

  5. Make sure to Save changes to confirm your actions.

Notes via CLI

Notes using the MAAS CLI are handled a little differently from the UI.

Identifying your machines

To determine machine identifiers, run the following command:

maas $PROFILE machines read \
| jq -r '(["hostname","system_id"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id])
|@tsv' | column -t
Managing notes in CLI

You can add or modify a note as follows:

maas $PROFILE machine update $SYSTEM_ID description="$NOTE"

To erase a note, just use an empty string:

maas $PROFILE machine update $SYSTEM_ID description=""

Dynamic annotations

Dynamic annotations are ephemeral data, tied to the operational states of allocated or deployed machines. These annotations are especially handy for tracking the live status of your workloads.

Identifying eligible machines for dynamic annotations

To list machines that can receive dynamic annotations, execute:

maas $PROFILE machines read \
| jq -r '(["hostname","system_id","status"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.status_name])
|@tsv' | column -t
Setting dynamic annotations

You can define dynamic annotations using key=value pairs. To set one, use:

maas $PROFILE machine set-owner-data $SYSTEM_ID $KEY=$VALUE
Managing dynamic annotations

To change or remove a dynamic annotation, use the following commands:

  • For changing:
maas $PROFILE machine set-owner-data $SYSTEM_ID $KEY=$NEW_VALUE
  • For removing:
maas $PROFILE machine set-owner-data $SYSTEM_ID $KEY=""
Listing dynamic annotations

To view all current dynamic annotations, run:

maas $PROFILE machines read \
| jq -r '(["hostname","system_id","owner_data"]
|(.,map(length*"-"))),(.[]|[.hostname,.system_id,.owner_data[]])
|@tsv' | column -t

Summary

Annotations in MAAS offer an additional layer of intelligence to your machine management. While notes provide a stable form of annotations, dynamic annotations offer a more fluid form of tracking, directly linked to your machine’s operational status.

Last updated 7 days ago.

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