Migrating to a system with a different architecture

Problem

RRDtool is not architecture-agnostic, and will require you to dump and restore the RRD contents to XML prior to being able to use them. I'm migrating the installation from sphere to phobos, so replace those names with your own machines in the rest of this article.

Solution

SSH key generation

If you don't have ssh keys to log in to your old machine, be prepared to type your password a few hundred to thousand times...

 phobos:/opt/observium# ssh-keygen -t rsa
 Generating public/private rsa key pair.
 Enter file in which to save the key (/root/.ssh/id_rsa):
 Enter passphrase (empty for no passphrase):
 Enter same passphrase again:
 Your identification has been saved in /root/.ssh/id_rsa.
 Your public key has been saved in /root/.ssh/id_rsa.pub.
 The key fingerprint is:
 00:ba:9c:40:f8:c9:5d:8a:c3:6e:87:b9:57:34:65:de root@phobos
 The key's randomart image is:
 +--[ RSA 2048]----+
 |..  .            |
 |o  . .. o        |
 |.+.+ o.+ .       |
 | oBoo o.. E      |
 | .++ . .S        |
 |  = . .          |
 | . o .           |
 |  . .            |
 |   .             |
 +-----------------+
 phobos:/opt/observium# ssh-copy-id sphere
 Password:

Now try logging into the machine, with "ssh 'sphere'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

Start the dump/restore process

 phobos:/opt/observium# for i in `find . -name *.rrd`; do 
 ssh sphere rrdtool dump /opt/observium/$i > /tmp/$(basename $i)
 rm $i
 rrdtool restore /tmp/$(basename $i) $i
 rm /tmp/$(basename $i)
 done