How to upgrade the elastic cluster deployed by docker?

Elastic Stack Elasticsearch
1

I started the elasticsearch cluster with docker-compose, and I wanted to upgrade from 7.9.1 to 7.10.0. There is already some data(Advanced Settings,Spaces,Saved Objects) on kibana. How to upgrade the cluster without losing data?

If I try to modify ' image: elasticsearch:7.9.1>> image: elasticsearch:7.10.0 '

Can elasticsearch continue to use the data generated in 7.9.1?

version: '3.6'
services:
  elasticsearch:
    image: elasticsearch:7.9.1
    container_name: elasticsearch-docker
    environment:
      - node.name=es-docker
      - cluster.name=es-single-node
      - discovery.type=single-node
      - bootstrap.memory_lock=false
      - "ES_JAVA_OPTS=-Xms2G -Xmx2G"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - /home/esdata/:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - elastic
  kibana:
    image: kibana:7.9.1
    container_name: kibana
    environment:
      - "ELASTICSEARCH_URL=http://elasticsearch:9200"
    depends_on:
      - elasticsearch
    ports:
      - "5601:5601"
    networks:
      - elastic
2

That is the easiest way, yes.

3

Thank you, I know how to upgrade, but I'm not sure that there will be data loss or exception in this operation?

4

There shouldn't be as you are using persistent volumes.

If in doubt, always backup first.

5

According to my docker-compose.yaml file, I only need to backup the data of es?

As far as I know, some information (cluster.id, cluster election ID...) will be saved when kibana is started. I have tried to upgrade (6.X> 7.X) in a binary deployment cluster, and there have been many errors, but I It is operated in accordance with the document.

So I want to get more suggestions for this upgrade.

6

6>7 is not as simple due to major version changes.
Minor upgrades are a lot easier.

7

But I want to know what bad effects this upgrade will have.

8

If you've read the upgrade documentation and release notes, take a backup, and follow the upgrade process, then you should be fine.

9

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