lxc: restricting container view of dmesg
If you don’t like the idea of your lxc container to view dmesg output, which includes host’s data, here is a quick tip.
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“Error: queue file write error” with Postfix and Amavis
If you’re using Postfix and Amavis, you may be seeing “Error: queue file write error”, especially with larger than usually email rates.
Here is what you can do to get rid of them.
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restoring a single table from a large MySQL dump file
If you have a large MySQL dump file, but only need to restore a single table, you may use the following:
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repairing broken PostgreSQL databases / tables
If your server happened to crash, Postgres database is corrupted, but didn’t contain too precious information, you may try the following fix.
The typical symptoms of a corrupted Postgres database would be like below:
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sitemap.xml for Mailman
If you ever wondered how to generate a sitemap file for Mailman (the GNU Mailing List Manager), to be submitted i.e. to Google, here is how.
All you have to do is replacing a few variables, and submitting the sitemap to your favourite search engine.
It is based on a real website running Mailman: http://lists.wpkg.org
With below code, it takes around 5 seconds to generate a sitemap consisting of 10000 articles.
Facebook, Twitter, Google+ buttons in MediaWiki
If you’re looking for a way to add Facebook, Twitter, Google+ buttons in your MediaWiki installation, you may be disappointed – there are no plugins offering all three social buttons. There are some other plugins, but they are often outdated, don’t work with current MediaWiki versions, or are simply broken.
How about doing a small change to your skin then and adding the buttons yourself?
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ezzi.net still down following Sandy storm hurricane
Some datacenters and hosting providers in New York area are still down following the Sandy storm hurricane.
One of them is ezzi.net, which is offline since around 1 am, 30-Oct-2012, CET time (or, 8 pm, 29-Oct-2012 EDT).
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simple filesystem read/write tracing with /proc/sys/vm/block_dump
Ever wondered what is hammering your disk so now and then, but couldn’t figure out with top / htop and similar? Annoying, but constant 100-200 kB/s writes? Or, simply blktrace was an overkill (or not supported by the kernel)?
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SOCKS proxy with OpenSSH (instead of port forwarding)
You’ve probably used port forwarding available in OpenSSH to securely forward selected ports to selected hosts.
What if you wanted to securely push i.e. all web traffic from your PC/laptop through some other server running?
OpenSSH and its SOCKS capability to the rescue!
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Amazon EC2 outage + web interface not working
It’s 22 Oct 2012, 18:30 UTC and it’s not possible to use Amazon EC2 web interface located at https://console.aws.amazon.com/ec2/:
# curl https://console.aws.amazon.com/ec2/
Http/1.1 Service Unavailable
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