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Manual Chapter: Working with Single Configuration Files
Manual Chapter
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Working with Single Configuration Files

Overview: Working with single configuration files

A single configuration file (SCF) is a flat, text file that contains a series of tmsh commands, and the attributes and values of those commands, that reflect the configuration of the BIG-IP® system. Specifically, the SCF contains the local traffic management and TMOS® configuration of the BIG-IP system. This figure shows a small part of a sample SCF.

  vlan external {
    tag 4093
    interfaces 1.3
}
vlan internal {
    tag 4094
    interfaces 1.10
}
pool dev_https3 {
    members {
        10.60.10.105:https{}
        10.60.10.106:https{}
    }
}   
  

The single configuration file feature allows you to save the configuration of a BIG-IP system in a text file. You can then use the text file to easily replicate the configuration across multiple BIG-IP systems. This not only saves you time, but also allows you to create a consistent, secure, comprehensive local traffic management environment on your network.

tmsh commands for single configuration files (SCFs)

You use tmsh to manage a single configuration file (SCF). This table lists an overview of tmsh commands used to manage SCF files.

tmsh command Description
save sys config file [filename] Saves a copy of the currently running configuration to an SCF.
Important: Saving a configuration to an SCF does not affect the running or stored configuration of the BIG-IP® system on which you run the command.
load sys config file [filename] Replaces or restores an SCF with a saved configuration. When you use this command, the system saves any previously running configuration to the /var/local/scf/ directory, by default.
load sys config default Restores the factory default settings of the configuration file, while retaining the management IP address and the administrator user name and password.

Task summary

You can perform three main tasks with respect to single configuration files.

Task list

Creating and saving an SCF

You can use tmsh to create and save a single configuration file (SCF).
Important: The system configuration data contained in the text file includes any local device certificate and keys used to establish device trust between this system and the other devices in a BIG-IP device group. These certificates and keys are unencrypted in the text file and are not included in the .tar file.
Note: If you create an SCF file twice (on two different occasions), you can compare the contents of the two files.
  1. Open the Traffic Management Shell (tmsh).
    tmsh
  2. Create and save an SCF.
    save sys config file [filename]
    Note: If you include the .scf extension in the file name, the system does not add an additional file extension.
    The system gathers all of the commands that make up the running configuration, and then saves the configuration to a .scf file with the name you specify. The system also creates a corresponding .tar file. By default, the system stores these files in the /var/local/scf directory, but you can specify a different path if you prefer.

Loading an SCF onto a target BIG-IP system

You can use tmsh to load a single configuration file (SCF) on one BIG-IP® system that you created on another BIG-IP system (hereafter referred to as the target BIG-IP system). This saves you from having to recreate the configuration multiple times. Loading an SCF resets the running configuration with the values contained in the stored configuration.

Important: If you run a load command or restart the system before you save your changes to the stored configuration, you will lose any changes.
Note: To successfully load a configuration that you have replicated, make sure that no line of the configuration is longer than 4096 characters. If there are more than 4096 characters in a single line, the system reverts to the previous running configuration.
  1. Open the Traffic Management Shell (tmsh).
    tmsh
  2. On the target BIG-IP system, load the saved SCF file.
    tmsh load sys config file [filename]
    The system saves the stored configuration to a backup file named /var/local/scf/backup.scf, and then uses the configuration stored in the SCF that you are loading.
  3. Use a text editor to open the SCF and edit any data that is unique to the target BIG-IP system, such as the management IP address.
  4. Save the SCF to the target BIG-IP system.
    sys save config file [filename]
    If a backup SCF already exists, the system appends a number to the name of the existing backup file, and then creates a new backup file. In the case of multiple load and save operations:
    • The first time the system backs up the running configuration during a load operation, the system names the backup file /var/local/scf/backup.scf.
    • The next time the system backs up the running configuration, the system renames the file from /var/local/scf/backup.scf to /var/local/scf/backup-1.scf and creates a new file named /var/local/scf/backup.scf.
    • If you run the load command a third time, the system renames the file from /var/local/scf/backup-1.scf to /var/local/scf/backup-2.scf, renames the /var/local/scf/backup.scf file to /var/local/scf/backup-1.scf, and again creates a new file named /var/local/scf/backup.scf.

Using an SCF to restore a BIG-IP system configuration

You can use tmsh to restore a BIG-IP® system configuration using either a specific single configuration file (SCF) or the factory default configuration.
  1. Open the Traffic Management Shell (tmsh).
    tmsh
  2. Restore the system configuration using one of these options:
    • Restore a system to the factory default configuration by using tmsh load sys config default. This command retains the management IP and the assigned root and administrator passwords. When you use this command, the system first saves the running configuration in the backup.scf file, and then resets the local traffic management and the operating system configuration to the factory default settings by loading the factory default SCF (/defaults/defaults.scf).
    • Restore a system with values defined in the specified SCF by using tmsh load sys config file [filename]. When you use this command, the system first saves the running configuration in the backup.scf file, and then resets the running configuration to the values contained in the specified SCF.
      Note: You must run the save sys config partitions all command to save the running configuration in the stored configuration files.
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