This week wasn't calm - at least hardware crash isn't a big help to reach a certain point in meditation. But it's always a good opportunity to run disaster recovery procedures and learn new things.
The following steps explain how to do a disaster recovery on a crashed FreeBSD system by using ufs dumps. It is of course a requirement, that the file systems are ufs and that you have a ufs dump as backup lying around...
1) Install the same FreeBSD version as previously on the system (in this case it was FreeBSD 9.0). If this information is around, create the same partition sizes and names as on the original system.
2) Boot from mfsBSD (http://mfsbsd.vx.sk). root password is "mfsroot".
3) Configure the network interface, so you are able to mount the backup server via NFS:
ifconfig bce0 192.168.12.30 netmask 255.255.255.0
mount 192.168.12.50:/backups /mnt
4) Format the local partitions (created on step 1 at the installation). In my case I had separate partitions for root, var, usr and swap. The swap partition doesn't need to be formatted and restored of course...
newfs -U /dev/da0p2
newfs -U /dev/da0p4
newfs -U /dev/da0p5
5) Now for each file system to restore, you have to mount the partition and launch the restore from the ufs dump:
mkdir /mnt2
mount /dev/da0p2 /mnt2
cd /mnt2
restore -rf /mnt/myserver/ufs-dumps/root.dump-0
umount /mnt2
Proceed with the next file system to restore.
6 - might not be necessary)
This is it, but one thing needs to be verified: Is the restored fstab file correct? Does it match the new partition table? In my case, there was a difference as the old system was set up with so-called FreeBSD slices:
mount /dev/da0p2 /mnt2
cat /mnt2/etc/fstab
# Device Mountpoint FStype Options Dump Pass#
/dev/da0s1b none swap sw 0 0
/dev/da0s1a / ufs rw 1 1
/dev/da0s1f /usr ufs rw 2 2
/dev/da0s1d /var ufs rw 2 2
This file needs to be changed to match the mount points with the new partition names:
cat /mnt2/etc/fstab
# Device Mountpoint FStype Options Dump Pass#
/dev/da0p3 none swap sw 0 0
/dev/da0p2 / ufs rw 1 1
/dev/da0p5 /usr ufs rw 2 2
/dev/da0p4 /var ufs rw 2 2
7) Now reboot and the original FreeBSD system should boot up.
No comments yet.
AWS Android Ansible Apache Apple Atlassian BSD Backup Bash Bluecoat CMS Chef Cloud Coding Consul Containers CouchDB DB DNS Database Databases Docker ELK Elasticsearch Filebeat FreeBSD Galera Git GlusterFS Grafana Graphics HAProxy HTML Hacks Hardware Icinga Influx Internet Java KVM Kibana Kodi Kubernetes LVM LXC Linux Logstash Mac Macintosh Mail MariaDB Minio MongoDB Monitoring Multimedia MySQL NFS Nagios Network Nginx OSSEC OTRS Office OpenSearch PGSQL PHP Perl Personal PostgreSQL Postgres PowerDNS Proxmox Proxy Python Rancher Rant Redis Roundcube SSL Samba Seafile Security Shell SmartOS Solaris Surveillance Systemd TLS Tomcat Ubuntu Unix VMWare VMware Varnish Virtualization Windows Wireless Wordpress Wyse ZFS Zoneminder