We were recently in the position that we had to shut our servers down during building maintenance windows. This was due to excessive vibrations throughout the building structure, and we felt this would affect the disks in the servers. Shutting down the servers automatically was the easy part, starting them back up less so. We could have changed the BIOS settings to do this, but that would require downtime to make the change, and there was also no guarantee the BIOS would have a scheduled startup option. So, we turned to the HP iLO instead. I made these notes in the works wiki, so the language may not flow sensibly at times.
A variety of tools are used to automate server startup. In order for it to be automated, it must be possible to log in to the iLO using SSH keys. This is key-based authentication instead of password based, so it retains security but allows non-interactive logins based on trust.
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1. iLO User To set up key based authentication, it is wise to set up a user with only the functions you require enabled. In this case, create a user called ilouser that only has privileges against the ‘Virtual Power and Reset’ option. Note down the password, but be aware that it is not required after this stage.
2. SSH Key Once the user has been set up on the iLO, a key-pair with the same username has to be generated. At the command line on a Linux machine, generate the keypair with… ssh-keygen -b 1024 -f ilouser -C ilouser
Do not enter a passphrase (this can be used to secure a key even more, but forces the authentication to become interactive.) This creates two files. KyleG@WMWS0001:/tmp> ls -l ilouser* -rw——- 1 KyleG users 887 2008-12-09 11:21 ilouser -rw-r–r– 1 KyleG users 217 2008-12-09 11:21 ilouser.pub KyleG@WMWS0001:/tmp>
ilouser – this private key remains on the source machine ilouser.pub – this is the public part that will get uploaded to the iLO
Do not change the permission modes on the files, as SSH checks them on use. It will not use files with loose permissions.
3. iLO SSH Key Authentication Log in to the iLO again, and select the SSH Key Authorization menu. Browse to your ilouser.pub and upload it to the iLO. All being well, the iLO will accept it against the ilouser account (or an account with the same details as the comment field in the public key – ilouser.pub)
4. Testing Login Test that the system can log in by specifying the location of the private key (the file without the .pub), the username to login with, and the hostname. ssh -i /home/KyleG/ilouser/ilo-user [email protected]
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All being well, you will be presented with the iLO SSH interface after a short delay. If you encounter an error involving dispatch_protocol_error, then your iLO firmware should be updated. It will still allow you to execute commands non-interactively though.
5. Running a command non-interactively It sounds complex, but in reality use the above command and append the command you want to execute onto the end, enclosed in single quotes. KyleG@WMWS0001:/tmp> ssh -i /tmp/ilouser [email protected] ‘power on’ dispatch_protocol_error: type 100 seq 8 power on
Server power already On
hpiLO> KyleG@WMWS0001:/tmp>
The dispatch_protocol_error is a bug in the iLO firmware on CHSR0001
6. Automating it To automate it, use crontab on a different machine and use the above command. An example crontab line would be 30 2 * * * /usr/bin/ssh -i /home/KyleG/ilouser/ilouser [email protected] ‘power on’
This will execute the command every day at 0230. The command logs into the remote machine over SSH, and simply runs the ‘power on’ command.
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