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Rotate KES

info

It is best to rename the old kes.vkey, kes.skey & node.cert files beforehand. Append the date. I tend to use mv instead of cp. This way I do not start creating copies of files.

caution

You only need kes.skey, node.cert and vrf.skey on your Core node.

Determine KES period by querying current slot number divided by slots per KES period found in genesis file.

Core
cd $NODE_HOME
slotNo=$(cardano-cli query tip --mainnet | jq -r '.slot')
slotsPerKESPeriod=$(cat $NODE_FILES/mainnet-shelley-genesis.json | jq -r '.slotsPerKESPeriod')
kesPeriod=$((${slotNo} / ${slotsPerKESPeriod}))
startKesPeriod=${kesPeriod}
echo startKesPeriod: ${startKesPeriod}

Generate a new KES key pair.

Core
cardano-cli node key-gen-KES \
  --verification-key-file kes.vkey \
  --signing-key-file kes.skey

Move kes.vkey to your Cold Offline machine & issue a new node.cert.

Cold Offline
cd $NODE_HOME
chmod u+rwx $HOME/cold-keys
cardano-cli node issue-op-cert \
  --kes-verification-key-file kes.vkey \
  --cold-signing-key-file $HOME/cold-keys/node.skey \
  --operational-certificate-issue-counter $HOME/cold-keys/node.counter \
  --kes-period <startKesPeriod> \
  --out-file node.cert
chmod a-rwx $HOME/cold-keys
caution

The cold.counter in your cold-keys folder keeps track of how many times you have rotated your kes pair.

Move node.cert back to Core & restart the cardano-service.

Core
cardano-service restart