Images are managed in LDAP with scPosImage objects. The scPosImage object stores information about an image stored on the Administration Server. For more information on images, see Section 8.0, Building Images with the scr ImageBuilder Tool.
The following sections outline how to use posAdmin to manage images in LDAP:
NOTE:Each LDAP object has two types of attributes: must and may attributes. The must attributes are the minimum requirements for an object. The may attributes are optional.
Every client image that you want to distribute to Point of Service terminals must have a corresponding scPosImage object in the LDAP directory. These objects are typically organized within Distribution Container objects under the Global container in the LDAP tree.
NOTE:Boot images do no have scPosImage objects; they are referenced in the scInitrdName attribute in the scDistributionContainer object.
After the installation and configuration of the Novell Linux Point of Service, an scPosImage object is automatically added to the Default Distribution Container for the Minimal image. However, this LDAP entry is only intended to serve as an example. You must manually add an scPosImage object for each client image you want to distribute to Point of Service terminals.
IMPORTANT:The images that ship with Novell Linux Point of Service 9 are built on Novell Linux Desktop (NLD) which runs the Linux 2.6 kernel. Therefore, the reference objects for Novell Linux Point of Service 9 images must be created in the Default Distribution Container.
If you migrate from SLRS 8 to Novell Linux Point of Service
9, the migration script creates the SLRS 8 distribution container.
This container references the SLRS 8 kernel and therefore, must
store all the scPosImage objects for SLRS 8 images. For more information,
see Migrating
from SLRS 8 to Novell Linux Point of Service 9
in
the Novell Linux Point of Service 9 Installation Guide.
Table 6-13 summarizes the posAdmin command options for scPosImage object attributes.
Table 6-13 Command options for scPosImage objects
|
Option |
Type |
Description |
|---|---|---|
|
--base |
must |
The base distinguished name of the scPosImage object; for example, cn=global,o=mycorp,c=us. |
|
--cn |
must |
The common name of the client image; for example, myjava. |
|
--scImageName |
must |
The name of the client image; for example, myjava. |
|
--scPosImageVersion |
must |
The version number of the client image, followed by the flag passive or active; for example, 2.0.21; active. The version number and the flag are semicolon-separated (’;’). There are several combinations possible of this attribute, which are described in Table 6-14. |
|
--scDhcpOptionsRemote |
must |
The boot option of the Point of Service terminal.The mandatory value is /boot/pxelinux.0. |
|
--scDhcpOptionsLocal |
reserved |
This attribute is reserved for future extension of the Novell Linux Point of Service and is not used at this time. |
|
--scImageFile |
must |
The filename of the image, which the terminal will download from the Branch Server; for example, myjava. |
|
--scBsize |
must |
Specifies the block size for the TFTP download of the client image. For example, 8192. possible values are: 4096 (4 KB) for image sizes less than 128 MB, 8192 (8 KB) for image sizes less than 256MB, 16384 (16 KB) for image sizes less than 512 MB and 32768 (32 KB) for image sizes less than 1GB. You must select a TFTP block size of 32 KB for the full-featured Desktop image, because there is a limitation of the block counter for TFTP. |
|
--scConfigFile |
may |
Specifies the path where the configuration file is installed on the Point of Service terminal; for example, /etc/ntp.conf or /etc/X11/XF86Config. |
The following example adds a scPosImage object below the Global container (type the command all on one line):
posAdmin.pl --user cn=admin,o=mycorp,c=us --password secret --base cn=global,o=mycorp,c=us --add --scPosImage --cn myJava --scImageName myJava --scPosImageVersion "2.0.21;active" --scDhcpOptionsRemote /boot/pxelinux.0 --scDhcpOptionsLocal LOCALBOOT --scImageFile myJava --scConfigFile /etc/X11/XF86Config
Each image can be available in several versions, as shown in Table 6-14. The scPosImageVersion attribute in each scPosImage object must be set to either active or passive. Active versions are downloaded by the Branch Server. If there are multiple active versions of a single image, the Branch Server selects the highest active version. Passive image versions are never downloaded to the Branch Server unless they are explicitly configured in the scWorkstation entry for the individual Point of Service terminal.
Table 6-14 Possible values for the scPosImageVersion attribute
To activate a registered image, set its scPosImageVersion attribute to active. This is done with posAdmin using the --modify keyword and the --multival (multivalue) option as follows (type the command all on one line):
posAdmin.pl --user cn=admin,o=mycorp,c=us --password secret --modify --scPosImage --multival --scPosImageVersion '2.3.10;passive=>2.3.10;active' --DN cn=browser,cn=default,cn=global,o=mycorp,c=us
To activate the new image version on a Branch Server, use possyncimages.pl and posldap2crconfig.pl with the --dumpall option.
possyncimages posldap2crconfig --dumpall
You can assign a specific image to a Point of Service terminal through its scWorkstation object.
The following command assigns Browser image 2.3.10 to the CR001 scWorkstation object in the boston1 container (type the command all on one line):
posAdmin.pl --user cn=admin,o=mycorp,c=us --password secret --modify --scWorkstation --scPosImageDn cn=browser,cn=default,cn=global,o=mycorp,c=us --scPosImageVersion 2.3.10 --DN cn=CR001,cn=boston1,ou=boston,o=mycorp,c=us
When you explicitly assign an image in the scWorkstation entry, the active or passive flag set for the scPosImage object in the global container is ignored.
NOTE:The scWorkstation object is automatically created in the LDAP directory the first time you boot a Point of Service terminal. The posleases2ldap daemon automatically triggers posldap2crconfig.pl which then creates an scWorkstation object and hardware configuration files for each Point of Service terminal that registers on the Branch Server. For more information on this process, see Section 3.0, Point of Service Terminals.
To remove the image assigned to a workstation, run the following command (type the command all on one line):
posAdmin.pl --user cn=admin,o=mycorp,c=us --password secret --remove --scWorkstation --scPosImageDn --scPosImageVersion --DN cn=CR001,ou=boston1,ou=boston,o=mycorp,c=us