https://docs.graylog.org/docs/docker

https://community.graylog.org/t/graylog-container-cannot-connect-to-mongodb-container/5783/2

mkdir data/{elasticsearch,journal,mongo}
chmod -R a+w data

curl -H 'Accept: application/json' 'http://localhost:7555/api/?pretty=true'
curl -u admin:may12002 -H 'Accept: application/json' 'http://localhost:7555/api/system/cluster/stats/mongo?pretty=true'
echo '{"version": "1.1","host":"example.org","short_message":"A short message that helps you identify what is going on","full_message":"Backtrace here\n\nmore stuff","level":1,"_user_id":9001,"_some_info":"foo","_some_env_var":"bar"}' | nc -w 1 localhost 12201

echo -e '{"version": "1.1","host":"example.org","short_message":"Short message","full_message":"Backtrace here\n\nmore stuff","level":1,"_user_id":9001,"_some_info":"foo","_some_env_var":"bar"}\0' | nc -w 1 localhost 12201

