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Hi,
We have now re-added hyacinth as the s3/s4/s6 fast server. We will
monitor its performance over the next few days.
- river.
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Hi,
On Wednesday night (or possibly Thursday morning) UTC, we will do some
maintenance on wolfsbane, the web server. This will at least involve a
reboot (5-10 minutes downtime). There may be some additional
interruption for network configuration changes, but I'll try to keep
that to a minimum.
- river.
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Hi,
I am about to move user databases (sql) from zedler to adenia. This
will involve a few hours read-ony time while the data is copied.
Sorry for the short notice for this maintenance.
- river.
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Hi,
Anyone who has OSM tools running on cassini should now start moving them
to the normal Toolserver and accessing the database and renderd on
sql-mapnik (ptolemy). We will be repurposing cassini once all tools
have moved.
- river.
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Hi,
In the near future we plan to add an additional web server to the
Toolserver. This will provide redundancy if either server fails, as
well as increasing capacity. Each server will be identically configured
(with the same OS, software, etc.), and HTTP requests will be
distributed evenly between the systems.
Some tools may require changes to function correctly in this
environment:
* Any tool which stores data on a local disk (e.g. /tmp or /var/tmp)
and expects to retrieve the data in a different request may find the
data is not present if the subsequent request runs on a different web
server. To fix this, such data should be stored in a location
accessible from all systems (e.g. $HOME).
* Web frameworks supporting HTTP sessions often use local storage for
session data. This will not work over multiple servers, for the same
reason as local files. To fix this, configure your framework to store
session data in $HOME or a MySQL database instead of local files.
(No changes are needed for PHP, which is already configured this way.)
* Tools which expect server-specific details (e.g. hostname or IP
address) to remain the same will not work. This is always a bad idea,
but will now not work at all.
* Tools which require some kind of separate daemon will need to start
the daemon on both systems, or communicate with the daemon over the
network.
* Initially, there will be independent access and error logs for
each system. To ease debugging of scripts, it will be possible to use
a URL like <http://wolfsbane.toolserver.org/~jsmith/mytool/> to force
the request to a particular system. However, such URLs should not be
used for any other purpose, since server names can change at any time,
which would break the URLs.
In the future, we hope to have unified logs for all web servers.
We plan to have the additional web server operational within the next
week or two.
- river.
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Hi,
We are about to enable fast servers for s3/s4/s6 (on hyacinth) and s2/s5
(on yarrow). These work the same as the fast servers for s1; just
connect to sql-sX-fast, or XXwiki-p.fastdb.toolserver.org to use them.
This will also provide redundant access to the wiki databases (but not
user databases) when the primary database is offline.
- river.
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