How to Update Graylog version in docker

To use the latest version change the tag of the graylog image from 2.4.0-1 to 2.4 or 2.4.6-1

Seems like the documentation you found is not completely in line with the documentation on docker hub:

If you simply want to checkout Graylog without any further customization, you can run the following three commands to create the necessary environment:

docker run --name mongo -d mongo:3

docker run --name elasticsearch \ -e "http.host=0.0.0.0" -e "xpack.security.enabled=false" \ -d docker.elastic.co/elasticsearch/elasticsearch:5.6.12

docker run --link mongo --link elasticsearch \ -p 9000:9000 -p 12201:12201 -p 514:514 \ -e GRAYLOG_WEB_ENDPOINT_URI="http://127.0.0.1:9000/api" \ -d graylog/graylog:2.4

First i have installed graylog with my own volumes

docker run --link mongo --link elasticsearch \           -p 9000:9000 -p 12201:12201 -p 514:514 \           -e GRAYLOG_WEB_ENDPOINT_URI="http://127.0.0.1:9000/api" \           -d graylog/graylog:2.4.0-1

Now stop graylog using

docker stop [graylog Container ID]

Now remove container from docker

docker rm [graylog Container ID]

Now Remove docker image

docker rmi [graylog Image ID]

Now again install graylog by changing the graylog version

docker run --link mongo --link elasticsearch \           -p 9000:9000 -p 12201:12201 -p 514:514 \           -e GRAYLOG_WEB_ENDPOINT_URI="http://127.0.0.1:9000/api" \           -d graylog/graylog:2.4.6-1

Note: Only remove graylog not mongoDB/Elasticsearch. Then you won't loose any data.