---
name: "backup_addhost"
section: "8"
platform: "linux"
package: "openafs-client"
version: "1.8.13.2-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/backup_addhost"
---

# backup\_addhost(8)

Adds a Tape Coordinator entry to the Backup Database

## NAME

backup\_addhost - Adds a Tape Coordinator entry to the Backup Database

## SYNOPSIS

**backup addhost** **-tapehost** \<*tape machine name*\>\
     \[**-portoffset** \<*TC port offset*\>\]\
     \[**-localauth**\] \[**-cell** \<*cell name*\>\] \[**-help**\]

**backup addh** **-t** \<*tape machine name*\>\
     \[**-p** \<*TC port offset*\>\]\
     \[**-l**\] \[**-c** \<*cell name*\>\] \[**-h**\]

## DESCRIPTION

The **backup addhost** command creates a Tape Coordinator entry in the Backup Database. The entry records

- •

  The host name of the Tape Coordinator machine where the Tape Coordinator (**butc**) process runs, as specified with the **-tapehost** argument.

- •

  The Tape Coordinator's port offset number, as specified with the **-portoffset** argument. An entry for the port offset must also appear in the */var/lib/openafs/backup/tapeconfig* file on the Tape Coordinator machine, where it is mapped to a UNIX device name (for a tape device) or pathname (for a backup data file).

Each Tape Coordinator must have its own port offset number, and the command fails if a Backup Database entry already exists for the requested port offset number. To display existing Tape Coordinator entries, use the **backup listhosts** command.

## OPTIONS

- **-tapehost** \<*tape machine name*\>

  Specifies the fully-qualified hostname of the machine for which to create a Tape Coordinator entry in the Backup Database. The machine must have an entry in either the cell's naming service (such as the Domain Name Service) or the host file (*/etc/hosts* or equivalent) on the machine where the command is issued.

- **-portoffset** \<*TC port offset*\>

  Specifies the Tape Coordinator's port offset number. Provide an integer from the range `0` through `58510`, or omit this argument to use the default value of `0` (zero). The value must match the port offset number recorded for the same combination of Tape Coordinator and tape device or file in the */var/lib/openafs/backup/tapeconfig* file on the Tape Coordinator machine named by the **-tapehost** argument.

- **-localauth**

  Constructs a server ticket using a key from the local */etc/openafs/server/KeyFile* file. The **backup** command interpreter presents it to the Backup Server, Volume Server and VL Server during mutual authentication. Do not combine this flag with the **-cell** argument. For more details, see [**backup**(8)](/backup/8.md).

- **-cell** \<*cell name*\>

  Names the cell in which to run the command. Do not combine this argument with the **-localauth** flag. For more details, see [**backup**(8)](/backup/8.md).

- **-help**

  Prints the online help for this command. All other valid options are ignored.

## EXAMPLES

The following command creates an entry in the Backup Database that assigns port offset number 4 to a Tape Coordinator running on the machine `"backup1.example.com"`:

```
   % backup addhost -tapehost backup1.example.com -portoffset 4
```

The following command creates a Backup Database entry that assigns port offset number 0 to a Tape Coordinator on the machine `"backup3.example.com"`:

```
   % backup addhost backup3.example.com
```

## PRIVILEGE REQUIRED

The issuer must be listed in the */etc/openafs/server/UserList* file on every machine where the Backup Server is running, or must be logged onto a server machine as the local superuser `"root"` if the **-localauth** flag is included.

## SEE ALSO

[**backup**(8)](/backup/8.md), [**backup\_delhost**(8)](/backup_delhost/8.md), [**backup\_listhosts**(8)](/backup_listhosts/8.md)

## COPYRIGHT

IBM Corporation 2000. \<http://www.ibm.com/\> All Rights Reserved.

This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.