OK.
I was wrong with my previous post. It DOES look like ganglia will start
to display my new metrics in the host view. But I'm still having some
problems.
The main issue is that the rrd graphs for my metrics don't contain
historical data.
For example they just say "now 1.00" which for my mysql_threads metric
is totally correct since this is a test box that I'm setting these
metrics up on and has no running servers connected (hence has only one
thread).
The problem is that there is no graph data for the last hour of this
data even though I run gmetric every two minutes via crontab.
I also setup a memcached gmetric script which connects to a memcached
node, dumps all stats, and then runs gmetric across them.
There are about 15 stats that I want to log.
I'm having the same problem with the historical data for my memcached
stats but a second problem is that 1/2 of the RRD files for my memcached
nodes don't exist on disk.
The images come up as broken and then when I tail my Apache error log I get:
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_bytes_written.rrd': No
such file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_cmd_get.rrd': No such file
or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_curr_connections.rrd': No
such file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_curr_items.rrd': No such
file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_get_misses.rrd': No such
file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_get_hits.rrd': No such
file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_rusage_system.rrd': No
such file or directory
ERROR: opening '/var/lib/ganglia/rrds/db/10.0.0.12/memcached_time.rrd':
No such file or directory
ERROR: opening
'/var/lib/ganglia/rrds/db/10.0.0.12/memcached_total_connections.rrd': No
such file or directory
Which explains a lot.
Also... besides the NOW consolidation function could I suggest 3 more?
AVG, MAX, and MIN. For a given time range these are VERY useful. It
should just be a tweak of your rrdtool cmdline.
We use this internally but ironically don't use the NOW function which
might be nice.
Also... it would be nice if there was documentation for this. When I
get it all setup I'll write a HOWTO Setup GMetric with Ganglia to create
custom metrics.
Kevin
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