Friday, February 23, 2018

FreeNAS and ESXi config backup


My FreeNAS was running off a single USB so I grabbed another one to setup a mirror but it was a few blocks smaller then the current one so would not mirror. Instead of spending time to make it work, I just took a backup of the config, re-installed to the mirror and restored the config. Super simple. This made me think I should get some automation in place to backup its config vs me doing it manually when I make changes in the GUI.

Doing some research on the FreeNAS forums you can just copy the config db from /data/freenas-v1.db to somewhere else. Since I'm using v11 its a simple 'cp -a' script. Being FreeNAS I thought using snapshots would be useful for change control etc so I created a new dataset (sysadmin) with max compression and copied the config to that location.

Then I thought someone else did something more eloquent so I went looking around and found a nice script from Spearfoot on GitHub that handles this and had the bonus of backing up the config of a ESXi host which I also needed to get some config backups.

I created the directory /root/bin as its in path so easy to keep track of and put the script there.

I ended up changing the script as it puts a timestamp in the file however due to my snapshots I didnt need it. Here is old vs new.

 #fnconfigdest="${configdir}"/"${freenashost}"-"${fnconfigdest_version}"-"${fnconfigdest_date}".db  
 #fnconfigdest="${configdir}"/"${freenashost}"-"${fnconfigdest_version}".db  

I'll still have to manually cleanup files when the version changes however I wanted to retain the version for compatability reasons. This gives me a nice single daily file and then the snapshot handles revision control.

 -rw-r----- 1 root wheel 933888 Feb 22 03:00 freenas-FreeNAS-11.1-U1-f7e246b8f.db  

For the ESXI host this script will SSH to it and then pulls the config. In order to automate I had to first setup certificates between these two systems. Interactive logins are disabled on all my hosts but I didnt expect these two to talk to each this way so had to setup certificates. You can go here or here for more detail on the process if you are unfamilar. These are the commands.

 #cd /root/.ssh  
 #ssh-keygen -N "" -f id_esxi  
 #cat id_esxi.pub | ssh root@ESXI_HOSTNAME_OR_IP_ADDRESS 'cat >>/etc/ssh/keys-root/authorized_keys'  

First line  just puts you into roots ssh dir. The second generates a passphrase less key pair. Think hard here on whether this works in your environment. Being my homelab and interactice logins disabled everywhere I was ok with the risk. Third line will copy the public key to the ESXi host. Once the keys are done and on each system you just ssh with this switch:

 ssh -i id_esxi root@ESXI_HOSTNAME_OR_IP_ADDRESS  

For the GitHub script I had to add the -i switch (highlighted above) to use the certificate.

 #esxihostname=$(ssh -i /root/.ssh/id_esxi root@"${esxihost}" hostname)   
 #esxiversion=$(ssh -i /root/.ssh/id_esxi root@"${esxihost}" uname -a | sed -e "s|VMkernel ||;s|$esxihostname ||")   
 #esxiconfig_url=$(ssh -i /root/.ssh/id_esxi root@"${esxihost}" vim-cmd hostsvc/firmware/backup_config | awk '{print $  7}' | sed -e "s|*|$esxihostname|")  

This all works via shell and I now have backups of my two main systems.

 -rw-r--r-- 1 root wheel  20623 Feb 22 03:00 esxi-configBundle.tgz  
 -rw-r----- 1 root wheel 933888 Feb 22 03:00 freenas-FreeNAS-11.1-U1-f7e246b8f.db  

Next up was to get the cronjob going so we head over to the FreeNAS GUI under Tasks | Cron Jobs and create it. I did it for 3AM. For the command I am using:

 sh /root/bin/save_config.sh  


Finally create the snapshot for 4AM.


The script will also send an email which is nice.

 Configuration file saved successfully on Thu Feb 22 03:00:00 MST 2018  
   
 FreeNAS:  
 Server: freenas.mydomain.com  
 Version: FreeNAS-11.1-U1 (f7e246b8f)  
 File: /mnt/Pool/sysadmin/freenas-FreeNAS-11.1-U1-f7e246b8f.db  
   
 ESXi:  
 Server: esxi.mydomain.com
 Version: 6.5.0 #1 SMP Release build-5969303 Jul 6 2017 21:22:25 x86_64 x86_64 x86_64 ESXi  
 File: /mnt/Pool/sysadmin/esxi-configBundle.tgz  

Almost done. RAID is not a backup so I still need to do something for fire/theft etc. To address that, I created a weekly cronjob to copy this from the sysadmin dataset into my main dataset which gets rsynced offsite daily. I may change this to daily so I have the most current configs offsite.

Just having about a weeks worth of backups its looking good


-Kevin

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