Mar 15
TL;DR — When using AUFS in a memory constrained environment, Java can spawn (lots!) of Zombies. A workaround is to change the storage driver to the device mapper. In working on the Hadoop in a box CDH cluster with Cloudera Manager, I’ve discovered a few interesting things about AUFS. These experiences are with Ubuntu 14.04 …
Feb 11
I had an instance where the docker filesystem ran out of space. After cleaning up with docker rm and docker rmi, I got:
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Could not find container for entity id |
I followed iwidanalage‘s suggestion from “Creating fail with Could not find container for entity id after upgrading to 1.9.0 · Issue #17691 · docker/docker”
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cd /var/lib/docker sudo sqlite3 linkgraph.db update edge set name='some-random-container-name' where name='failing-container-name'; .quit |
After this, it worked.
Oct 02
Java’s twenty years old now — next year Duke can have Irish Coffee! Seriously, though, in that time there’s been a lot of changes to the Java Virtual Machine (JVM). What once was true may no longer be the case. In digging into an issue I discovered a nice feature of the JVM which enables …
Sep 21
TL;DR The F5 BigPipe LTM uses HTTP/0.9 to send its HTTP monitoring requests by default. Wildfly 9.0 does not like this; moving to a monitor request of HTTP/1.1 fixed the problem. Caution: LTM 10.2.x and 11.x do not append a CR/LF to the end unless you are using Basic Authentication. This is contrary to previous …
Sep 07
The Computer employs Troubleshooters, whose job is to go out, find trouble, and shoot it. — Paranoia While re-imaging the MicroSD cards for my cluster, I ran into a few issues — nothing insurmountable, but I figured that I would share them to help others….. MicroSD cards generally come with an adapter to allow them …
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Ramblings by Matt Williams is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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