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Archive for 2012

Restart Brother ControlCenter

On your Mac, the Brother ControlCenter software that let's you scan an image from your Brother MFC to your computer is started at boot by launchd. Therefore, it can be restarted from the command line. For example, here is a list of processes controlled by launchd: $ launchctl list | grep brother 286 - [0x0-0x17017] […]

Categories: System Administration

Stuck at "copying to tmp table"

I have a fairly lightly loaded MySQL server with a few tables that are updated every five minutes. Other than these updates, there are very few queries run against the database. The data is queried just a few times per month. Ever so often, one of the more complicated queries will result in the process getting hung in the "copying to tmp table" state. To be honest, the queries that get hung aren't even that complicated. Usually there's one or two joins, a GROUP BY, and an ORDER BY.

Categories: System Administration

Cisco: Telnet/SSH work, HTTP Gives Permission Denied

Here are a few tips that might be helpful if you are having trouble accessing your Cisco router or switch via the web server. Make sure you have the right password! This is pretty obvious, but it's definitely the first thing worth checking. If you're using aaa new-model, you will need to tell the web […]

Categories: Networking

Apache Can't Use Remote MySQL Server When SELinux is Enabled

I don't know why SELinux problems seem so frustrating. The problem almost certainly is related to the fact that there is frequently no error message. This is exactly the problem I ran into while turning up a new Apache web server on Red Hat Enterprise Linux 6 (RHEL6) with SELinux enabled.

Categories: System Administration

Disable Spanning-Tree Per VLAN

If you need to disable spanning-tree on a particular VLAN in your Cisco-based network, use the following command...

Categories: Networking