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Aleksandar Bilanovic
Aleksandar Bilanovic

ReaR is an open source backup and recovery framework for Linux systems. It takes a full system backup by tar-gzipping files, disks, and metadata. This backup image and recovery tools are bundled in an initrd to allow restoring the full system configuration to bare metal after a disaster. ReaR backups are fast, online (no downtime), space-efficient, and can restore to another similar hardware for cloning. The presenter's company has modified ReaR to add remote root login and address patching for specific needs, and created a Ruby-based rearadm tool to manage backups by archiving, versioning, deleting, and provisioning restores.

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ReaR AleksandarBilanovic LHS Telekommunikation
What is ReaR ? ReaR is a highly modular backup/recovery framework, used in case of disaster to restore GNU/Linux operating system on bare metal machine. ? Basically ReaR is tar-gziping/ (slash) + stores metadata regarding file systems / LVM / boot loader / HW and SW RAID configuration, etc packed in initrd image along with system tools ¨C altogether usedso that same FS layout / boot configuration can be recreated upon restore ? Mature product - created as a spin-off of two existing projects: OpenVPN GW builder (Schapiro) and mkcdrec (D¡¯haese) ? Deutsche Qualit?t
Why ReaR ? Open source software written in shell using standard UNIX utils - can easily be modified to suit environment needs ? Fast ¨C both backup and restore operation ? Online ¨C no service interruption during backup ? Space efficient ¨C only effective data is being backed up ? Can be easily modified for specific needs and extend with new features ? Can restore to another (similar) hardware ¨C hence system cloning is possible ? Can also be used to manually restore individual files ? Can backup / restore to different backend storage (TSM, NFS)
Why not ReaR ? Does not work for Linux systems older than ~ 10 years (<2.6) ? Can work only if systems are on the same broadcast domain (on PXE based bare metal restore) ? Can fail in heavily customized GNU/Linux installation
Our modifications ? Patched sshd.conf/passwd to permit remote root logins ? Disk geometry fix patch ? grub.conf fix patch ? MAC addressed list also included in backup meta data ? DHCP/manual IP address assignment during restore (restore in different network)
Managing backups ? There wasn¡¯t free tool for managing backups ¨C so we wrote our own: ? rearadm ¨C ruby scrip (easy to understand ¨C clean code) ? ~ 1000 lines (including integrated man pages) ? archiving, versioning and deleting backups ? creating, changing and deleting hosts ? provisioning backups for restore procedure ? cloning systems
Demo ? ReaR installation & configuration ? creating backup ? managing backup ? archiving ? provisioning backup for restore/cloning
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  • 1. ReaR AleksandarBilanovic LHS Telekommunikation
  • 2. What is ReaR ? ReaR is a highly modular backup/recovery framework, used in case of disaster to restore GNU/Linux operating system on bare metal machine. ? Basically ReaR is tar-gziping/ (slash) + stores metadata regarding file systems / LVM / boot loader / HW and SW RAID configuration, etc packed in initrd image along with system tools ¨C altogether usedso that same FS layout / boot configuration can be recreated upon restore ? Mature product - created as a spin-off of two existing projects: OpenVPN GW builder (Schapiro) and mkcdrec (D¡¯haese) ? Deutsche Qualit?t
  • 3. Why ReaR ? Open source software written in shell using standard UNIX utils - can easily be modified to suit environment needs ? Fast ¨C both backup and restore operation ? Online ¨C no service interruption during backup ? Space efficient ¨C only effective data is being backed up ? Can be easily modified for specific needs and extend with new features ? Can restore to another (similar) hardware ¨C hence system cloning is possible ? Can also be used to manually restore individual files ? Can backup / restore to different backend storage (TSM, NFS)
  • 4. Why not ReaR ? Does not work for Linux systems older than ~ 10 years (<2.6) ? Can work only if systems are on the same broadcast domain (on PXE based bare metal restore) ? Can fail in heavily customized GNU/Linux installation
  • 5. Our modifications ? Patched sshd.conf/passwd to permit remote root logins ? Disk geometry fix patch ? grub.conf fix patch ? MAC addressed list also included in backup meta data ? DHCP/manual IP address assignment during restore (restore in different network)
  • 6. Managing backups ? There wasn¡¯t free tool for managing backups ¨C so we wrote our own: ? rearadm ¨C ruby scrip (easy to understand ¨C clean code) ? ~ 1000 lines (including integrated man pages) ? archiving, versioning and deleting backups ? creating, changing and deleting hosts ? provisioning backups for restore procedure ? cloning systems
  • 7. Demo ? ReaR installation & configuration ? creating backup ? managing backup ? archiving ? provisioning backup for restore/cloning