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Preparing for DR of a ServiceNav Box

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Purpose of this documentation

We have identified 2 scenarios in which a ServiceNav Box (SNB or supervision box) can be replaced:

  • A ServiceNav Box becomes unstable and has unpredictable behaviour and can be migrated to a new : Migration of a ServiceNav Box
  • A ServiceNav Box becomes completely unusable and after rebooting, it is no longer possible to connect to it either via the network or via a local console.

This documentation will deal with this second case and will present the 2 solutions available to customers to set up a Business Resumption Plan for stalls.
The actions presented below can be entirely carried out by customers without the intervention of ServiceNav support.

Backing up local configuration files

If the entire box configuration is stored on the central platform, some configuration files are only present locally on the box, so it is very important to keep a copy on external storage in case access to the box storage is no longer possible.

Here are the files in question :

  • The file iptablesTo be saved if custom rules have been set up -> /etc/init.d/iptables.sh
  • The file freetds containing the configuration for MSSQL database monitoring -> /etc/freetds.conf
  • The file tnsnames containing the configuration for Oracle database monitoring -> /usr/lib/oracle/12.2/client64/network/admin/tnsnames.ora OR/usr/lib/oracle/11.2/client64/network/admin/tnsnames.ora

It will be mandatory to place them in the correct location on the new SNB.

Complete replacement of a ServiceNav Box

If no backup of the box is available, it is possible to replace the SerivceNav Box HS with a new one.

Actions to be carried out :

  1. Provision a new ServiceNav Box from the image on our FTP site. It must have exactly the same characteristics than the SNB HS: CPU, RAM, disk space.
    Please note: in order to improve responsiveness, it is advisable to make this provisioning in advance.
  2. Switch off the faulty box completely and start the new one.
  3. Connect to the machine, go to root and run the box initialization script.
  4. Follow this documentation to answer the different steps: Installation of an SNBSee Part 3 "Configuring the ServiceNav Box".
    For the "Network settings" section: set the same IP LAN and the same Hostname that the box is out of order.
    For the "Download configuration" part: generate a token and an ID for the SNB in question.
    -> The new SNB will have the same name, ID and VPN IP address as the defective one.
    Make the link with the platform and configure the emails.
  5. Copy all local configuration files to the new SNB.
  6. Push the configuration back to the new SNB and it will take the same supervision configuration as on the faulty SNB.

This new SNB takes the place of the SNB HS and recovers all its configuration.

Supervision is operational again.

Rollback from a backup of the ServiceNav Box

When the ServiceNav Boxes are in the form of a virtual machine, it is very important to make regular backups of them (via the hypervisor directly or via a backup solution). It will then be very quick to restore a backup.

Actions to be carried out :

  1. Turn off the defective box completely.
  2. Deploy the last available backup of the box on the hypervisor.
  3. Start the new box from the backup.
  4. Verify that the VPN tunnel is properly mounted -> ifconfig tun0
    If the interface is present, the tunnel is operational :
  5. If one of the files listed in the chapter "Backing up local configuration files" has been modified since the last backup of the box, you will need to copy it to the new box that was created from the backup.
  6. In order to update this new box from the backup with the new configuration: connect to the ServiceNav web interface and push the configuration back to the box.

Supervision is operational again.

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