The sad process of installing Elasticsearch with docker

By default, Elasticsearch requires 2G of memory space when it is turned on, so if you don’t have enough memory during installation, you need to set the memory

• Check your own memory size: free -m
  
  Mem: means memory (see how much free you have left)
  Swap: means virtual memory
• To start:
  docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name el01 -e "discovery.type=single-node" 7ec4f35ab452

7ec4f35ab452: ImageId of Elasticsearch downloaded by docker

-e ES_JAVA_OPTS="-Xms256m -Xmx256m": Just set how much memory you want to start Elasticsearch, not too small!

9200: External access
9300: Internal access
discovery.type=single-node: Single node deployment

• Run in the browser:
  
  if this json data appears on your own IP: 9200, it means success! !
  Installed for the first time.