$ rpm -qa |grep -i codedeploy-agent
codedeploy-agent-1.0-1.1518.noarch
/var/log/aws/codedeploy-agent/*
2018-09-24 10:54:17 INFO [codedeploy-agent(13919)]: Version file found in /opt/codedeploy-agent/.version with agent version OFFICIAL_1.0-1.1518_rpm.
2018-09-24 10:54:17 ERROR [codedeploy-agent(13919)]: InstanceAgent::Plugins::CodeDeployPlugin::CommandPoller: Missing credentials – please check if this instance was started with an IAM instance profile
これか？
Missing credentials
sudo service codedeploy-agent restart
