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Resolving Docker Port 4243 Conflict With CrashPlan

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Hit a little snag while initializing boot2docker:

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$ boot2docker init
[2014-02-18 12:34:56] DOCKER_PORT=4243 on localhost is used by an other process! Change the port to a free port.

lsof shows it’s CrashPlan conflicting:

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$ sudo lsof -i :4243
COMMAND     PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
CrashPlan 20270 root   79u  IPv4 0x3c409a82447e9111      0t0  TCP localhost:4243 (LISTEN)

Seems like Docker will be changing their default port soon. In the meantime, here’s how to change CrashPlan backup service’s port on OS X:

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