Month: January 2013
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ZFS: Renaming a zpool
If you’ve imported a pool from another system and want to change the name or have just changed your mind, this is actually quite straightforward to do. Run the following (as root): zpool export [poolname] As an example, for a pool named tank which we wish to rename notankshere: zpool export tank Then run:…
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Western Digital Green drive resilver rates
We get asked fairly regularly about resilver rates for ZFS pools – these matter as it impacts on how quickly a vdev with faulty disks can rebuild data onto a fresh disk, as well as how quickly you can swap one disk for another. The longer it takes to rebuild the vdev after…
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New Wireless Access Point: TP-Link TL-WA701ND
We have a new wireless AP in-house for testing: It’s pretty inexpensive, but does it do what it says on the box? Stay tuned for a review 🙂
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Samba log showing error: failed to retrieve printer list
If you’re using Ubuntu and seeing the following error in your Samba log: Failed to retrieve printer list: NT_STATUS_UNSUCCESSFUL If you are a home user and using samba purely for file sharing from a server or NAS you’re probably not interested in sharing printers through it. If so, you can prevent this…
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How to see individual CPU core loads in Ubuntu
This is an interesting one – if you have the need to monitor your CPU usage individually across cores it’s actually quite easy with the top command. Simply run top and hit “1” – your output will go from: to: In this case the server is a hexcore (0-5 cores shown, 6…
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How to kill a process after a set period of time
Knowing how to limit how long a process will run for is quite useful, particularly when you have daily backup scripts and the like which may at times run more than 24 hours; having multiple processes attempting to synchronize the same files can waste time, bandwidth and CPU power needlessly. The command we will…
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How to easily find the full path of a command in Ubuntu
If you’re writing scripts or making cron jobs you will need to know the full path of the commands you’re using; rather than just being able to use “ls” you would have to use “/bin/ls” instead. You could use the find command here but there’s a quicker and more elegant way: which. Use it…
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Using rsync with a non-standard SSH port
There are many reasons you may be using an SSH port other than 22; perhaps you changed it as a security measure, or perhaps you have multiple machines behind your firewall which you are port forwarding to and thus have to use other ports in addition to 22. Rsync is an extremely powerful file…
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New Intel Motherboard in-house: S1200KPR Mini-ITX Server board
We’ve been building a few mini servers with these lately and finally found the time for a bit of a write-up – we’re almost finished, so keep your eyes peeled for a review shortly!
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MySQL: Changing the root user’s password
If you need to change the MySQL root user’s password use the following from a command prompt: mysqladmin -u root -p password NEWPASSWORD Enter the current root password when prompted and replace NEWPASSWORD with the desired password. This should return you to the command prompt, and you can test whether it was…