Storage promises refer to disks and filesystem properties.

code
storage:

   "/disk volume or mountpoint"

     volume => volume_body,
     ...;
code
bundle agent storage
{
  storage:

    "/usr" volume  => mycheck("10%");
    "/mnt" mount   => nfs("nfsserv.example.org","/home");

}

body volume mycheck(free)   # reusable template

{
  check_foreign  => "false";
  freespace      => "$(free)";
  sensible_size  => "10000";
  sensible_count => "2";
}

body mount nfs(server,source)

{
  mount_type => "nfs";
  mount_source => "$(source)";
  mount_server => "$(server)";
  edit_fstab => "true";
}

Attributes

Common attributes

Common attributes are available to all promise types. Full details for common attributes can be found in the Common promise attributes section of the Promise types page. The common attributes are as follows:

action

classes

comment

depends_on

handle

if

meta

with

mount

Type: body mount

See also: Common body attributes

edit_fstab

Description: true/false add or remove entries to the file system table ("fstab")

The default behavior is to not place edits in the file system table.

Type: boolean

Default value: false

Example:

code
body mount example
{
  edit_fstab => "true";
}

mount_type

Description: Protocol type of remote file system

Type: (menu option)

Allowed input range:

  • nfs
  • nfs2
  • nfs3
  • nfs4
  • panfs
  • cifs

Example:

code
bundle agent main
{
  vars:
    redhat|centos::
      "cifs" data => '{ "server": "192.168.42.251", "path": "/Audio" }';

  packages:
    redhat|centos::
      "cifs-utils"   policy => "present";
      "samba-client" policy => "present";

  files:
    redhat|centos::
      "/mnt/CIFS/." create => "true";

  storage:
    redhat|centos::
      "/mnt/CIFS"
        mount => cifs_guest( $(cifs[server]) , $(cifs[path]) );
}

body mount cifs_guest(server,source)
{
        mount_type => "cifs";
        mount_source => "$(source)";
        mount_server => "$(server)";
        mount_options => { "guest" };
        edit_fstab => "false";
}

This policy can be found in /var/cfengine/share/doc/examples/storage-cifs.cf and downloaded directly from github.

History:

  • cifs, panfs added in 3.15.0

mount_source

Description: Path of remote file system to mount.

This is the location on the remote device, server, SAN etc.

Type: string

Allowed input range: "?(/.*)

Example:

code
body mount example
{
mount_source "/location/disk/directory";
}

mount_server

Description: Hostname or IP or remote file system server.

Type: string

Allowed input range: (arbitrary string)

Example:

code
body mount example
{
  mount_server => "nfs_host.example.org";
}

mount_options

Description: List of option strings to add to the file system table ("fstab").

This list is concatenated in a form appropriate for the filesystem. The options must be legal options for the system mount commands.

Type: slist

Allowed input range: (arbitrary string)

Example:

code
body mount example
{
  mount_options => { "rw", "acls" };
}

unmount

Description: true/false unmount a previously mounted filesystem

Type: boolean

Default value: false

Example:

code
body mount example
{
unmount => "true";
}

volume

Type: body volume

See also: Common body attributes

check_foreign

Description: If true, verify storage that is mounted from a foreign system on this host.

CFEngine will not normally perform sanity checks on filesystems that are not local to the host. If true it will ignore a partition's network location and ask the current host to verify storage located physically on other systems.

Type: boolean

Default value: false

Example:

code
body volume example
{
  check_foreign  => "true";
}

freespace

Description: Absolute or percentage minimum disk space that should be available before warning

The amount of free space that is promised on a storage device. Once this promise is found not to be kept (that is, if the free space falls below the promised value), warnings are generated. You may also want to use the results of this promise to control other promises.

Type: string

Allowed input range: [0-9]+[MBkKgGmb%]

Example:

code
body volume example1
{
freespace => "10%";
}

body volume example2
{
freespace => "50M";
}

sensible_size

Description: Minimum size in bytes that should be used on a sensible-looking storage device

Type: int

Allowed input range: 0,99999999999

Example:

code
body volume example
{
sensible_size => "20K";
}

sensible_count

Description: Minimum number of files that should be defined on a sensible-looking storage device.

Files must be readable by the agent. In other words, it is assumed that the agent has privileges on volumes being checked.

Type: int

Allowed input range: 0,99999999999

Example:

code
body volume example
{
sensible_count => "20";
}

scan_arrivals

Description: If true, generate pseudo-periodic disk change arrival distribution.

This operation should not be left 'on' for more than a single run (maximum once per week). It causes CFEngine to perform an extensive disk scan noting the schedule of changes between files. This can be used for a number of analyses including optimum backup schedule computation.

Type: boolean

Default value: false

Example:

code
body volume example
{
  scan_arrivals => "true";
}