Synnefo » snf-image

h1. Configuration Tasks

Configuration tasks are scripts called by snf-image-helper, to accomplish various configuration steps on the newly created instance. See below for a description of each one of them:

*FixPartitionTable*: Enlarges the last partition in the partition table of the instance, to consume all the available space. For now, only primary partitions are supported.

*FilesystemResizeUnmounted*: Extends the file system of the last partition to cover up the whole partition. This only works for ext{2,3,4} file systems. Any other file system type is ignored and a warning is triggered. The task will fail if @SNF_IMAGE_DEV@ environmental variable is missing.

*MountImage*: Mounts the nth partition of @SNF_IMAGE_DEV@, which is specified by @SNF_IMAGE_PROPERTY_ROOT_PARTITION@ variable under the directory specified by @SNF_IMAGE_TARGET@. The script will fail if any of those 3 variables has a non-sane value.

*DeleteSSHKeys*: For linux images, this script will clear out any ssh keys found in the image and for debian, it will recreate them too. In order to find the ssh keys, the script looks in default locations (@/etc/ssh/ssh_*_key@) and also parses @/etc/ssh/sshd_config@ file if present. The script will fail if @SNF_IMAGE_TARGET@ is not set.

*DisableRemoteDesktopConnections*: This script temporary disables RDP connections in windows instances by changing the value fDenyTSConnection registry key. RDP connections will be enabled back during the specialize pass of the Windows setup. The task will fail if @SNF_IMAGE_TARGET@ is not defined.

*InstallUnattend*: Installs the Unattend.xml files in windows images. This is needed by windows in order to perform an unattended setup. The @SNF_IMAGE_TARGET@ variables needs to be present for this task to run.

*SELinuxAutorelabel*: Creates .autorelabel file in RedHat images. This is needed if SELinux is enabled to enforce an automatic file system relabeling at the next boot. The only enviromental variable required by this task is @SNF_IMAGE_TARGET@.

*AssignHostname*: Assigns or changes the hostname in a Linux or Windows image. The task will fail if the Linux distribution is not supported. For now, we support debian, redhat, slackware, suse and gentoo derived distros. The hostname is read from @SNF_IMAGE_HOSTNAME@ variable. In addition to the latter, @SNF_IMAGE_TARGET@ is also required.

*ChangePassword*: Changes the password for a list of users. For Linux systems this is accomplished by directly altering the image's @/etc/shadow@ file. For Windows systems a script is injected into the VM's hard disk. This script will be executed during the specialize pass of the Windows setup. The list of users whose passwords will changed is determined by the @SNF_IMAGE_PROPERTY_USERS@ variable (see [[Image Format#Image-Properties|here]]). For this task to run @SNF_IMAGE_TARGET@ and @SNF_IMAGE_PASSWORD@ variables need to be present.

*EnforcePersonality*: Injects the files specified by the @SNF_IMAGE_PROPERTY_OSFAMILY@ variable into the file system. If the variable is missing a warning is produced. The only environmental variable required is @SNF_IMAGE_TARGET@.

*FilesystemResizeMounted*: Injects a script into a Windows image file system that will enlarge the last file system to cover up the whole partition. The script will run during the specialize pass of the Windows setup. If the @SNF_IMAGE_TARGET@ variable is missing, the task will fail.

*UmountImage*: Umounts the file system previously mounted by @MountImage@. The only environmental variable required is @SNF_IMAGE_TARGET@.

|_/2=.Name|_/2=.Pr.|_\2=.Dependencies|_\2=.Enviromental Variables ^1^|

|_.Run-After|_.Run-Before|_.Required|_.Optional|

|FixPartitionTable|10||FilesystemResizeUnmounted|@DEV@||

|FilesystemResizeUnmounted|20|FixPartitionTable|MountImage|@DEV@||

|MountImage|30||UmountImage|@DEV@

@TARGET@

@PROPERTY_ROOT_PARTITION@||

|DeleteSSHKeys|40|MountImage|UmountImage|@TARGET@|@PROPERTY_OSFAMILY@|

|DisableRemoteDesktopConnections|40|MountImage|UmountImage|@TARGET@|@PROPERTY_OSFAMILY@|

|InstallUnattend|40|MountImage|UmountImage|@TARGET@|@PROPERTY_OSFAMILY@|

|SELinuxAutorelabel|40|MountImage|UmountImage|@TARGET@|@PROPERTY_OSFAMILY@|

|AssignHostname|50|InstallUnattend|UmountImage|@TARGET@

@HOSTNAME@|@PROPERTY_OSFAMILY@|

|ChangePassword|50|InstallUnattend|UmountImage|@TARGET@

@PASSWORD@|@PROPERTY_USERS@

@PROPERTY_OSFAMILY@|

|EnforcePersonality|50|DeleteSSHKeys|UmountImage|@TARGET@|@PERSONALITY@

@PROPERTY_OSFAMILY@|

|FilesystemResizeMounted|50|InstallUnattend|UmountImage|@TARGET@|@PROPERTY_OSFAMILY@|

|UmountImage|80|MountImage||@TARGET@||

^1: all enviromental variables are prefixed with SNF_IMAGE_^