Run Elasticsearch by docker

1. Download the docker image of Elasticsearch, taking version 7.6.0 as an example

    docker pull elasticsearch:7.6.0

2. Create a container and run it.

if your command is:

   docker run -d --name es -p 9200:9200 -p 9300:9300 elasticsearch:7.6.0

It may exit shortly after starting. To find out the reason, view logs by log command:

   docker logs es

Some error message like max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] may appear. Go the following command:

   # change the variable
   sysctl -w vm.max_map_count=262144
   # check the variable value
   sysctl -n vm.max_map_count

If the error message is the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured, which means the container has wrong configuration and can be corrected by setting those prompted environment variables or setting to standalone development mode by discovery.type=single-node.

In short, the correct command is:

   docker run -d --name es -p 9200:9200 -p 9300:9300 -e discovery.type=single-node elasticsearch:7.6.0

Using IK Chinese segmentation plugin.

1. Download the plugin.

The plugin version must equal the Elasticsearch version. Version 7.6.0 download link is https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v7.6.0/elasticsearch-analysis-ik-7.6.0.zip

2. Unzip to an empty directory, which is referred to as $IK.

3. Copy the $IK into the directory of the container's plugin.

   docker cp $IK es:/usr/share/elasticsearch/plugins/ik

This plugin provides analyzer and tokenizer named ik_smart and ik_max_word where ik_smart splits by the coarsest granularity, while ik_max_word will exhaust all kinds of split combinations.

Find more info at IK.

# 2021年04月30日
# 分类:  技术
# 标签:  Elasticsearch   Docker   技术笔记