Update graylog-server (open version) from 6.0.3 to 7.0.5 step by step
1) stop graylog service:
sudo systemctl stop graylog-server
sudo systemctl stop graylog-datanode
2) unhold graylog-server:
sudo apt-mark unhold graylog-server
3) download new version packages & install:
wget https://packages.graylog2.org/repo/packages/graylog-7.0-repository_latest.deb
sudo dpkg -i graylog-7.0-repository_latest.deb
sudo apt-get update
sudo apt-get install graylog-server
4) update graylog-datanode:
sudo systemctl stop graylog-datanode
sudo apt-get install graylog-datanode
5) start graylog-server:
sudo systemctl start graylog-server.service
