Last tested: Nov 20, 2019
This error happens when you have a node connected to a MySQL backend, and you spin up another node and connect it to that backend without using the clustered flag. See docs for how to set up the nodes properly with the clustered flag.
However, this error can also occur in a couple of other situations: either Looker is already running on the host, or that a timezone on the host changed and there are entries in the node table that have a heartbeat in the future. The node table exists for both clustered and non-clustered instances.
To fix:
cd looker/.db
sed -i.bak '/^INSERT INTO "NODE" VALUES/d' looker.log
sed -i.bak '/^INSERT INTO "NODE" VALUES/d' looker.script
rm *.bak
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