MinioMigration

Minio changed the way it stores data in local datastores (your disk). Unfortunately there is no direct migration path. But creating a new minio instance and copying the content is straight forward. Here is how to do this:

1. modify docker-compose.yml file:
   • add new s3 service (latest minio version)
   • rename old s3 service
   • See example
2. stop s3 service
   • docker-compose stop s3
3. pull minio
   • docker-compose pull s3
4. recreate the s3 services
   • docker-compose up -d s3old s3
5. install minio-client on a system that has access to the two minio-instances (e.ie. docker-compose host)
6. connect minio-client to the two systems (credentials as in docker-compose.yml)
   • mc alias set s3old http://localhost:9050 [minio-user] [minio-pwd]
   • mc alias set s3 http://localhost:9060 [minio-user] [minio-pwd]
7. restart server (this creates the buckets on the new s3)
   • docker-compose restart server
8. copy all the data to the new server
   • mc mirror --watch s3old s3
9. stop old minio instance
   • docker-compose stop s3old
10. remove s3old from docker-compose.yml

Example of docker-compose.yml with second minio instance:

  [...]
  s3old:
    image: minio/minio:RELEASE.2022-10-24T18-35-07Z
    restart: unless-stopped
    volumes:
      - ./data/s3:/data
    environment:
      - MINIO_ROOT_USER=[minio-user]
      - MINIO_ROOT_PASSWORD=[minio-pwd]
      - TZ=UTC
    command: server /data
    ## depending on network setup
    ports:
      - "9050:9000"
    healthcheck:
      test: ["CMD", "curl", "-f", "http://s3old:9000/minio/health/live"]
      interval: 30s
      timeout: 20s
      retries: 3
    networks: 
      ooNet:
        ipv4_address: 172.16.0.3

  s3:
    image: minio/minio
    restart: unless-stopped
    volumes:
      - ./data/s3new:/data
    environment:
      - MINIO_ROOT_USER=[minio-user]
      - MINIO_ROOT_PASSWORD=[minio-pwd]
      - TZ=UTC
    command: server /data
    ## depending on network setup
    ports:
      - "9060:9000"
    healthcheck:
      test: ["CMD", "curl", "-f", "http://s3:9000/minio/health/live"]
      interval: 30s
      timeout: 20s
      retries: 3
    networks: 
      ooNet:
        ipv4_address: 172.16.0.33
[...]