GCS Tech, Inc.
12 E. 4th St.
Spencer, IA 51301
Date: Nov.22, 2019
1. Buffalo Terastation enable SSH for adding the Check_MK agent
I wanted to add the Check_MK agent to a Buffalo Terastation TS3410R and I found there is no way to enable SSH on the unit. Everything on the web that I find is for older units and the use of ACP Commander will no longer enable SSH, but it does come in handy for this fix. Here is how I enabled SSH and then installed the Check_MK agent.
Standard Warning: Following these instructions may void your warranty with Buffalo and could cause the unit to become unusable. You follow these directions at your own risk. Do not blame me if you cause issues.
Log into the Terastation
In the web interface go to File Sharing
Enable rsync and then click the gear icon
Put your admin password in the blank and click to enable rsync over SSH
Click OK to save.
This enables SSH on the unit but we still can’t log in.
I used the ACP Commander from https://gry.ch/Java/styled. I downloaded the EXE for Microsoft Windows as I have an older box that I keep with Java 6.x running on it just for such occasions. The EXE works fine on it.
Open ACP Commander it will find the IP address and port for your Terastation. Put in the admin password and type the following in the Command: box.
sed -i ‘s/rbash/bash/g’ /etc/passwd
This changes the admin user from a restricted bash shell to a regular bash shell.
Now I could SSH into the Terastation as admin
Then I had no sudo privileges so the account was extremely limited on what it could do.
So in ACP Commander I put
usermod -a -G sudo admin
In the Command: box and clicked Go! This adds the admin user to the sudo group.
Now I could log via SSH as admin and run sudo commands.
I rebooted the unit to see if it was going to undo anything I had done so far. When it came up I could still SSH in as admin and run sudo.
sudo passwd root
And changed the root password to something that I knew.
To be able to su up from admin to root we need to edit the /etc/pam.d/su file and comment out the line that reads
auth required pam_wheel.so use_uid
Use sudo vi /etc/pam.d/su
Now we can su to root with the following
Time to fix the $PATH of the user admin
sudo /bin/vi /home/.bash_profile
Change it to look like this
Save the file
Now to give admin a true home directory
su to root
Now we run vipw to edit the password file and change the admin line to:
save the file and issue the following commands
cp /home/.bash_profile /home/admin/
chown -R admin:admin /home/admin
Log out and back in as admin and we will have a normal user that can use sudo and su to run root commands.
On to Check_MK agent installation
Copy the check_mk_agent.linux file from your Check_MK server it will be under
to the Terastation. I used scp from the Terastation to the box that had the file. I placed the file in the /usr/local/bin directory. Then
mv /usr/local/bin/check_mk_agent.linux /usr/local/bin/check_mk_agent
chmod 775 /usr/local/bin/check_mk_agent
do a /6446 enter to search for 6446 and take you to that line. Add a line directly under it with the following
And save the file.
And add the line
check_mk stream tcp nowait root /usr/local/bin/check_mk_agent check_mk_agent
and save the file.
Now from another box or the Check_MK server you can issue
telnet <Terastation IP address> 6556
and you will get the agent output, and you can add the Terastation to Check_MK. I enabled SNMP on the Terastation through the web interface and ran both the Agent and SNMP queries from Check_MK. You will be able to monitor most aspects of the Terastation, included the RAID health which it what I was originally looking for. I am sure a firmware upgrade is going to remove all my changes, but I will update this document when that happens.