[Graylog2][Connection refused][port 4001]

REF: https://github.com/Graylog2/graylog2-images/issues/59

一直無法正常啟用 graylog2, 後來在系統日誌裡看到 port 4001 拒絕連線

mariussturm commented on 27 May 2015
Looks like the Etcd database got corrupted for some reason. Maybe the machine run out of diskspace or was hard resetted. If this is a single node installation you could try to delete /var/opt/graylog/data/etcd and afterwards run sudo graylog-ctl reconfigure