openstack-manuals/doc/cli-reference/source/trove.rst
KATO Tomoyuki 06be0d440d Publish RST Command-Line Interface Reference
Change-Id: I40d746c330fdcc0dc4ccf81096e26ef4c287586f
Implements: blueprint cli-ref-rst
2016-01-15 00:03:26 +09:00

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Database service command-line client

The trove client is the command-line interface (CLI) for the Database service API and its extensions.

This chapter documents trove version 1.4.0.

For help on a specific trove command, enter:

$ trove help COMMAND

trove usage

usage: trove [--version] [--debug] [--os-auth-system <auth-system>]
             [--service-type <service-type>] [--service-name <service-name>]
             [--bypass-url <bypass-url>]
             [--database-service-name <database-service-name>]
             [--endpoint-type <endpoint-type>]
             [--os-database-api-version <database-api-ver>]
             [--retries <retries>] [--json] [--insecure]
             [--os-cacert <ca-certificate>] [--os-cert <certificate>]
             [--os-key <key>] [--timeout <seconds>]
             [--os-auth-url OS_AUTH_URL] [--os-domain-id OS_DOMAIN_ID]
             [--os-domain-name OS_DOMAIN_NAME] [--os-project-id OS_PROJECT_ID]
             [--os-project-name OS_PROJECT_NAME]
             [--os-project-domain-id OS_PROJECT_DOMAIN_ID]
             [--os-project-domain-name OS_PROJECT_DOMAIN_NAME]
             [--os-trust-id OS_TRUST_ID] [--os-user-id OS_USER_ID]
             [--os-username OS_USERNAME]
             [--os-user-domain-id OS_USER_DOMAIN_ID]
             [--os-user-domain-name OS_USER_DOMAIN_NAME]
             [--os-password OS_PASSWORD] [--os-tenant-name <auth-tenant-name>]
             [--os-tenant-id <tenant-id>] [--os-auth-token OS_AUTH_TOKEN]
             [--os-region-name <region-name>]
             <subcommand> ...

Subcommands

backup-copy

Creates a backup from another backup.

backup-create

Creates a backup of an instance.

backup-delete

Deletes a backup.

backup-list

Lists available backups.

backup-list-instance

Lists available backups for an instance.

backup-show

Shows details of a backup.

cluster-create

Creates a new cluster.

cluster-delete

Deletes a cluster.

cluster-grow

Adds more instances to a cluster.

cluster-instances

Lists all instances of a cluster.

cluster-list

Lists all the clusters.

cluster-show

Shows details of a cluster.

cluster-shrink

Drops instances from a cluster.

configuration-attach

Attaches a configuration group to an instance.

configuration-create

Creates a configuration group.

configuration-default

Shows the default configuration of an instance.

configuration-delete

Deletes a configuration group.

configuration-detach

Detaches a configuration group from an instance.

configuration-instances

Lists all instances associated with a configuration group.

configuration-list

Lists all configuration groups.

configuration-parameter-list

Lists available parameters for a configuration group.

configuration-parameter-show

Shows details of a configuration parameter.

configuration-patch

Patches a configuration group.

configuration-show

Shows details of a configuration group.

configuration-update

Updates a configuration group.

create

Creates a new instance.

database-create

Creates a database on an instance.

database-delete

Deletes a database from an instance.

database-list

Lists available databases on an instance.

datastore-list

Lists available datastores.

datastore-show

Shows details of a datastore.

datastore-version-list

Lists available versions for a datastore.

datastore-version-show

Shows details of a datastore version.

delete

Deletes an instance.

detach-replica

Detaches a replica instance from its replication source.

eject-replica-source

Ejects a replica source from its set.

flavor-list

Lists available flavors.

flavor-show

Shows details of a flavor.

limit-list

Lists the limits for a tenant.

list

Lists all the instances.

metadata-create

Creates metadata in the database for instance <id>.

metadata-delete

Deletes metadata for instance <id>.

metadata-edit

Replaces metadata value with a new one, this is non-destructive.

metadata-list

Shows all metadata for instance <id>.

metadata-show

Shows metadata entry for key <key> and instance <id>.

metadata-update

Updates metadata, this is destructive.

promote-to-replica-source

Promotes a replica to be the new replica source of its set.

resize-instance

Resizes an instance with a new flavor.

resize-volume

Resizes the volume size of an instance.

restart

Restarts an instance.

root-enable

Enables root for an instance and resets if already exists.

root-show

Gets status if root was ever enabled for an instance or cluster.

secgroup-add-rule

Creates a security group rule.

secgroup-delete-rule

Deletes a security group rule.

secgroup-list

Lists all security groups.

secgroup-list-rules

Lists all rules for a security group.

secgroup-show

Shows details of a security group.

show

Shows details of an instance.

update

Updates an instance: Edits name, configuration, or replica source.

user-create

Creates a user on an instance.

user-delete

Deletes a user from an instance.

user-grant-access

Grants access to a database(s) for a user.

user-list

Lists the users for an instance.

user-revoke-access

Revokes access to a database for a user.

user-show

Shows details of a user of an instance.

user-show-access

Shows access details of a user of an instance.

user-update-attributes

Updates a user's attributes on an instance.

bash-completion

Prints arguments for bash_completion.

help

Displays help about this program or one of its subcommands.

trove optional arguments

--version

show program's version number and exit

--debug

Print debugging output.

--os-auth-system <auth-system>

Defaults to env[OS_AUTH_SYSTEM].

--service-type <service-type>

Defaults to database for most actions.

--service-name <service-name>

Defaults to env[TROVE_SERVICE_NAME].

--bypass-url <bypass-url>

Defaults to env[TROVE_BYPASS_URL].

--database-service-name <database-service-name>

Defaults to env[TROVE_DATABASE_SERVICE_NAME].

--endpoint-type <endpoint-type>

Defaults to env[TROVE_ENDPOINT_TYPE] or publicURL.

--os-database-api-version <database-api-ver>

Accepts 1, defaults to env[OS_DATABASE_API_VERSION].

--retries <retries>

Number of retries.

--json, --os-json-output

Output JSON instead of prettyprint. Defaults to env[OS_JSON_OUTPUT].

--insecure

Explicitly allow client to perform "insecure" TLS (https) requests. The server's certificate will not be verified against any certificate authorities. This option should be used with caution.

--os-cacert <ca-certificate>

Specify a CA bundle file to use in verifying a TLS (https) server certificate. Defaults to env[OS_CACERT].

--os-cert <certificate>

Defaults to env[OS_CERT].

--os-key <key>

Defaults to env[OS_KEY].

--timeout <seconds>

Set request timeout (in seconds).

--os-auth-url OS_AUTH_URL

Authentication URL

--os-domain-id OS_DOMAIN_ID

Domain ID to scope to

--os-domain-name OS_DOMAIN_NAME

Domain name to scope to

--os-project-id OS_PROJECT_ID

Project ID to scope to

--os-project-name OS_PROJECT_NAME

Project name to scope to

--os-project-domain-id OS_PROJECT_DOMAIN_ID

Domain ID containing project

--os-project-domain-name OS_PROJECT_DOMAIN_NAME

Domain name containing project

--os-trust-id OS_TRUST_ID

Trust ID

--os-user-id OS_USER_ID

User ID

--os-username OS_USERNAME, --os-user_name OS_USERNAME

Username

--os-user-domain-id OS_USER_DOMAIN_ID

User's domain id

--os-user-domain-name OS_USER_DOMAIN_NAME

User's domain name

--os-password OS_PASSWORD

User's password

--os-tenant-name <auth-tenant-name>

Tenant to request authorization on. Defaults to env[OS_TENANT_NAME].

--os-tenant-id <tenant-id>

Tenant to request authorization on. Defaults to env[OS_TENANT_ID].

--os-auth-token OS_AUTH_TOKEN

Defaults to env[OS_AUTH_TOKEN]

--os-region-name <region-name>

Specify the region to use. Defaults to env[OS_REGION_NAME].

trove backup-copy

usage: trove backup-copy <name> <backup>
                         [--region <region>] [--description <description>]

Creates a backup from another backup.

Positional arguments

<name>

Name of the backup.

<backup>

Backup ID of the source backup.

Optional arguments

--region <region>

Region where the source backup resides.

--description <description>

An optional description for the backup.

trove backup-create

usage: trove backup-create <instance> <name>
                           [--description <description>] [--parent <parent>]

Creates a backup of an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of the backup.

Optional arguments

--description <description>

An optional description for the backup.

--parent <parent>

Optional ID of the parent backup to perform an incremental backup from.

trove backup-delete

usage: trove backup-delete <backup>

Deletes a backup.

Positional arguments

<backup>

ID of the backup.

trove backup-list

usage: trove backup-list [--limit <limit>] [--marker <ID>]
                         [--datastore <datastore>]

Lists available backups.

Optional arguments

--limit <limit>

Return up to N number of the most recent backups.

--marker <ID>

Begin displaying the results for IDs greater than the specified marker. When used with --limit, set this to the last ID displayed in the previous run.

--datastore <datastore>

Name or ID of the datastore to list backups for.

trove backup-list-instance

usage: trove backup-list-instance [--limit <limit>] [--marker <ID>] <instance>

Lists available backups for an instance.

Positional arguments

<instance>

ID or name of the instance.

Optional arguments

--limit <limit>

Return up to N number of the most recent backups.

--marker <ID>

Begin displaying the results for IDs greater than the specified marker. When used with --limit, set this to the last ID displayed in the previous run.

trove backup-show

usage: trove backup-show <backup>

Shows details of a backup.

Positional arguments

<backup>

ID of the backup.

trove cluster-create

usage: trove cluster-create <name> <datastore> <datastore_version>
                            [--instance <opt=value,opt=value,...>]

Creates a new cluster.

Positional arguments

<name>

Name of the cluster.

<datastore>

A datastore name or ID.

<datastore_version>

A datastore version name or ID.

Optional arguments

--instance <opt=value,opt=value,...>

Create an instance for the cluster. Specify multiple times to create multiple instances. Valid options are: flavor=flavor_name_or_id, volume=disk_size_in_GB, nic='net-id=net-uuid,v4-fixed-ip=ip-addr,port-id=port-uuid' (where net-id=network_id, v4-fixed-ip=IPv4r_fixed_address, port-id=port_id), availability_zone=AZ_hint_for_Nova.

trove cluster-delete

usage: trove cluster-delete <cluster>

Deletes a cluster.

Positional arguments

<cluster>

ID or name of the cluster.

trove cluster-grow

usage: trove cluster-grow <cluster>
                          [--instance <name=name,flavor=flavor_name_or_id,volume=volume>]

Adds more instances to a cluster.

Positional arguments

<cluster>

ID or name of the cluster.

Optional arguments

--instance <name=name,flavor=flavor_name_or_id,volume=volume>

Add an instance to the cluster. Specify multiple times to create multiple instances.

trove cluster-instances

usage: trove cluster-instances <cluster>

Lists all instances of a cluster.

Positional arguments

<cluster>

ID or name of the cluster.

trove cluster-list

usage: trove cluster-list [--limit <limit>] [--marker <ID>]

Lists all the clusters.

Optional arguments

--limit <limit>

Limit the number of results displayed.

--marker <ID>

Begin displaying the results for IDs greater than the specified marker. When used with --limit, set this to the last ID displayed in the previous run.

trove cluster-show

usage: trove cluster-show <cluster>

Shows details of a cluster.

Positional arguments

<cluster>

ID or name of the cluster.

trove cluster-shrink

usage: trove cluster-shrink <cluster> <instance> [<instance> ...]

Drops instances from a cluster.

Positional arguments

<cluster>

ID or name of the cluster.

<instance>

Drop instance(s) from the cluster. Specify multiple ids to drop multiple instances.

trove configuration-attach

usage: trove configuration-attach <instance> <configuration>

Attaches a configuration group to an instance.

Positional arguments

<instance>

ID or name of the instance.

<configuration>

ID of the configuration group to attach to the instance.

trove configuration-create

usage: trove configuration-create <name> <values>
                                  [--datastore <datastore>]
                                  [--datastore_version <datastore_version>]
                                  [--description <description>]

Creates a configuration group.

Positional arguments

<name>

Name of the configuration group.

<values>

Dictionary of the values to set.

Optional arguments

--datastore <datastore>

Datastore assigned to the configuration group. Required if default datastore is not configured.

--datastore_version <datastore_version>

Datastore version ID assigned to the configuration group.

--description <description>

An optional description for the configuration group.

trove configuration-default

usage: trove configuration-default <instance>

Shows the default configuration of an instance.

Positional arguments

<instance>

ID or name of the instance.

trove configuration-delete

usage: trove configuration-delete <configuration_group>

Deletes a configuration group.

Positional arguments

<configuration_group>

ID of the configuration group.

trove configuration-detach

usage: trove configuration-detach <instance>

Detaches a configuration group from an instance.

Positional arguments

<instance>

ID or name of the instance.

trove configuration-instances

usage: trove configuration-instances <configuration_group>

Lists all instances associated with a configuration group.

Positional arguments

<configuration_group>

ID of the configuration group.

trove configuration-list

usage: trove configuration-list

Lists all configuration groups.

trove configuration-parameter-list

usage: trove configuration-parameter-list <datastore_version>
                                          [--datastore <datastore>]

Lists available parameters for a configuration group.

Positional arguments

<datastore_version>

Datastore version name or ID assigned to the configuration group.

Optional arguments

--datastore <datastore>

ID or name of the datastore to list configuration parameters for. Optional if the ID of the datastore_version is provided.

trove configuration-parameter-show

usage: trove configuration-parameter-show <datastore_version> <parameter>
                                          [--datastore <datastore>]

Shows details of a configuration parameter.

Positional arguments

<datastore_version>

Datastore version name or ID assigned to the configuration group.

<parameter>

Name of the configuration parameter.

Optional arguments

--datastore <datastore>

ID or name of the datastore to list configuration parameters for. Optional if the ID of the datastore_version is provided.

trove configuration-patch

usage: trove configuration-patch <configuration_group> <values>

Patches a configuration group.

Positional arguments

<configuration_group>

ID of the configuration group.

<values>

Dictionary of the values to set.

trove configuration-show

usage: trove configuration-show <configuration_group>

Shows details of a configuration group.

Positional arguments

<configuration_group>

ID of the configuration group.

trove configuration-update

usage: trove configuration-update <configuration_group> <values>
                                  [--name <name>]
                                  [--description <description>]

Updates a configuration group.

Positional arguments

<configuration_group>

ID of the configuration group.

<values>

Dictionary of the values to set.

Optional arguments

--name <name>

Name of the configuration group.

--description <description>

An optional description for the configuration group.

trove create

usage: trove create <name> <flavor>
                    [--size <size>]
                    [--databases <databases> [<databases> ...]]
                    [--users <users> [<users> ...]] [--backup <backup>]
                    [--availability_zone <availability_zone>]
                    [--datastore <datastore>]
                    [--datastore_version <datastore_version>]
                    [--nic <net-id=net-uuid,v4-fixed-ip=ip-addr,port-id=port-uuid>]
                    [--configuration <configuration>]
                    [--replica_of <source_instance>] [--replica_count <count>]

Creates a new instance.

Positional arguments

<name>

Name of the instance.

<flavor>

Flavor ID or name of the instance.

Optional arguments

--size <size>

Size of the instance disk volume in GB. Required when volume support is enabled.

--databases <databases> [<databases> ...]

Optional list of databases.

--users <users> [<users> ...]

Optional list of users in the form user:password.

--backup <backup>

A backup ID.

--availability_zone <availability_zone>

The Zone hint to give to nova.

--datastore <datastore>

A datastore name or ID.

--datastore_version <datastore_version>

A datastore version name or ID.

--nic <net-id=net-uuid,v4-fixed-ip=ip-addr,port-id=port-uuid>

Create a NIC on the instance. Specify option multiple times to create multiple NICs. net-id: attach NIC to network with this ID (either port-id or net-id must be specified), v4-fixed-ip: IPv4 fixed address for NIC (optional), port-id: attach NIC to port with this ID (either port-id or net-id must be specified).

--configuration <configuration>

ID of the configuration group to attach to the instance.

--replica_of <source_instance>

ID or name of an existing instance to replicate from.

--replica_count <count>

Number of replicas to create (defaults to 1).

trove database-create

usage: trove database-create <instance> <name>
                             [--character_set <character_set>]
                             [--collate <collate>]

Creates a database on an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of the database.

Optional arguments

--character_set <character_set>

Optional character set for database.

--collate <collate>

Optional collation type for database.

trove database-delete

usage: trove database-delete <instance> <database>

Deletes a database from an instance.

Positional arguments

<instance>

ID or name of the instance.

<database>

Name of the database.

trove database-list

usage: trove database-list <instance>

Lists available databases on an instance.

Positional arguments

<instance>

ID or name of the instance.

trove datastore-list

usage: trove datastore-list

Lists available datastores.

trove datastore-show

usage: trove datastore-show <datastore>

Shows details of a datastore.

Positional arguments

<datastore>

ID of the datastore.

trove datastore-version-list

usage: trove datastore-version-list <datastore>

Lists available versions for a datastore.

Positional arguments

<datastore>

ID or name of the datastore.

trove datastore-version-show

usage: trove datastore-version-show <datastore_version>
                                    [--datastore <datastore>]

Shows details of a datastore version.

Positional arguments

<datastore_version>

ID or name of the datastore version.

Optional arguments

--datastore <datastore>

ID or name of the datastore. Optional if the ID of the datastore_version is provided.

trove delete

usage: trove delete <instance>

Deletes an instance.

Positional arguments

<instance>

ID or name of the instance.

trove detach-replica

usage: trove detach-replica <instance>

Detaches a replica instance from its replication source.

Positional arguments

<instance>

ID or name of the instance.

trove eject-replica-source

usage: trove eject-replica-source <instance>

Ejects a replica source from its set.

Positional arguments

<instance>

ID or name of the instance.

trove flavor-list

usage: trove flavor-list [--datastore_type <datastore_type>]
                         [--datastore_version_id <datastore_version_id>]

Lists available flavors.

Optional arguments

--datastore_type <datastore_type>

Type of the datastore. For eg: mysql.

--datastore_version_id <datastore_version_id>

ID of the datastore version.

trove flavor-show

usage: trove flavor-show <flavor>

Shows details of a flavor.

Positional arguments

<flavor>

ID or name of the flavor.

trove limit-list

usage: trove limit-list

Lists the limits for a tenant.

trove list

usage: trove list [--limit <limit>] [--marker <ID>] [--include-clustered]

Lists all the instances.

Optional arguments

--limit <limit>

Limit the number of results displayed.

--marker <ID>

Begin displaying the results for IDs greater than the specified marker. When used with --limit, set this to the last ID displayed in the previous run.

--include-clustered

Include instances that are part of a cluster (default false).

trove metadata-create

usage: trove metadata-create <instance_id> <key> <value>

Creates metadata in the database for instance <id>.

Positional arguments

<instance_id>

UUID for instance.

<key>

Key for assignment.

<value>

Value to assign to <key>.

trove metadata-delete

usage: trove metadata-delete <instance_id> <key>

Deletes metadata for instance <id>.

Positional arguments

<instance_id>

UUID for instance.

<key>

Metadata key to delete.

trove metadata-edit

usage: trove metadata-edit <instance_id> <key> <value>

Replaces metadata value with a new one, this is non-destructive.

Positional arguments

<instance_id>

UUID for instance.

<key>

Key to replace.

<value>

New value to assign to <key>.

trove metadata-list

usage: trove metadata-list <instance_id>

Shows all metadata for instance <id>.

Positional arguments

<instance_id>

UUID for instance.

trove metadata-show

usage: trove metadata-show <instance_id> <key>

Shows metadata entry for key <key> and instance <id>.

Positional arguments

<instance_id>

UUID for instance.

<key>

Key to display.

trove metadata-update

usage: trove metadata-update <instance_id> <key> <newkey> <value>

Updates metadata, this is destructive.

Positional arguments

<instance_id>

UUID for instance.

<key>

Key to update.

<newkey>

New key.

<value>

Value to assign to <newkey>.

trove promote-to-replica-source

usage: trove promote-to-replica-source <instance>

Promotes a replica to be the new replica source of its set.

Positional arguments

<instance>

ID or name of the instance.

trove resize-instance

usage: trove resize-instance <instance> <flavor>

Resizes an instance with a new flavor.

Positional arguments

<instance>

ID or name of the instance.

<flavor>

New flavor of the instance.

trove resize-volume

usage: trove resize-volume <instance> <size>

Resizes the volume size of an instance.

Positional arguments

<instance>

ID or name of the instance.

<size>

New size of the instance disk volume in GB.

trove restart

usage: trove restart <instance>

Restarts an instance.

Positional arguments

<instance>

ID or name of the instance.

trove root-enable

usage: trove root-enable <instance_or_cluster>
                         [--root_password <root_password>]

Enables root for an instance and resets if already exists.

Positional arguments

<instance_or_cluster>

ID or name of the instance or cluster.

Optional arguments

--root_password <root_password>

Root password to set.

trove root-show

usage: trove root-show <instance_or_cluster>

Gets status if root was ever enabled for an instance or cluster.

Positional arguments

<instance_or_cluster>

ID or name of the instance or cluster.

trove secgroup-add-rule

usage: trove secgroup-add-rule <security_group> <cidr>

Creates a security group rule.

Positional arguments

<security_group>

Security group ID.

<cidr>

CIDR address.

trove secgroup-delete-rule

usage: trove secgroup-delete-rule <security_group_rule>

Deletes a security group rule.

Positional arguments

<security_group_rule>

Name of security group rule.

trove secgroup-list

usage: trove secgroup-list

Lists all security groups.

trove secgroup-list-rules

usage: trove secgroup-list-rules <security_group>

Lists all rules for a security group.

Positional arguments

<security_group>

Security group ID.

trove secgroup-show

usage: trove secgroup-show <security_group>

Shows details of a security group.

Positional arguments

<security_group>

Security group ID.

trove show

usage: trove show <instance>

Shows details of an instance.

Positional arguments

<instance>

ID or name of the instance.

trove update

usage: trove update <instance>
                    [--name <name>] [--configuration <configuration>]
                    [--detach-replica-source] [--remove_configuration]

Updates an instance: Edits name, configuration, or replica source.

Positional arguments

<instance>

ID or name of the instance.

Optional arguments

--name <name>

Name of the instance.

--configuration <configuration>

ID of the configuration reference to attach.

--detach-replica-source

Detach the replica instance from its replication source.

--remove_configuration

Drops the current configuration reference.

trove user-create

usage: trove user-create <instance> <name> <password>
                         [--host <host>]
                         [--databases <databases> [<databases> ...]]

Creates a user on an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

<password>

Password of user.

Optional arguments

--host <host>

Optional host of user.

--databases <databases> [<databases> ...]

Optional list of databases.

trove user-delete

usage: trove user-delete [--host <host>] <instance> <name>

Deletes a user from an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

Optional arguments

--host <host>

Optional host of user.

trove user-grant-access

usage: trove user-grant-access <instance> <name> <databases> [<databases> ...]
                               [--host <host>]

Grants access to a database(s) for a user.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

<databases>

List of databases.

Optional arguments

--host <host>

Optional host of user.

trove user-list

usage: trove user-list <instance>

Lists the users for an instance.

Positional arguments

<instance>

ID or name of the instance.

trove user-revoke-access

usage: trove user-revoke-access [--host <host>] <instance> <name> <database>

Revokes access to a database for a user.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

<database>

A single database.

Optional arguments

--host <host>

Optional host of user.

trove user-show

usage: trove user-show [--host <host>] <instance> <name>

Shows details of a user of an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

Optional arguments

--host <host>

Optional host of user.

trove user-show-access

usage: trove user-show-access [--host <host>] <instance> <name>

Shows access details of a user of an instance.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

Optional arguments

--host <host>

Optional host of user.

trove user-update-attributes

usage: trove user-update-attributes <instance> <name>
                                    [--host <host>] [--new_name <new_name>]
                                    [--new_password <new_password>]
                                    [--new_host <new_host>]

Updates a user's attributes on an instance. At least one optional argument must be provided.

Positional arguments

<instance>

ID or name of the instance.

<name>

Name of user.

Optional arguments

--host <host>

Optional host of user.

--new_name <new_name>

Optional new name of user.

--new_password <new_password>

Optional new password of user.

--new_host <new_host>

Optional new host of user.