Docker安装Elasticsearch

1. 下载镜像

docker pull docker.elastic.co/elasticsearch/elasticsearch:8.6.2

2. 启动容器

2.1 创建配置文件docker-compose.yml:

version: "3.3"

services:
  elasticsearch:
    container_name: elasticsearch
    image: docker.elastic.co/elasticsearch/elasticsearch:8.6.2
    restart: always
    ports:
      - 9200:9200
      - 9300:9300
    environment:
      # 指定单节点启动
      - discovery.type=single-node
      - "ES_JAVA_OPTS=-Xms2g -Xmx8g"
      # 开启内存锁定
      - bootstrap.memory_lock=true
      # 不开启权限验证
      - xpack.security.enabled=false
#    mem_limit: ${MEM_LIMIT}
    ulimits:
      # 取消内存相关限制 用于开启内存锁定
      memlock:
        soft: -1
        hard: -1

2.2 运行容器docker-compose up

3. 复制出配置文件、插件、数据目录

# 创建一个目录， 用来存放elasticsearch配置和数据
mkdir /data/elasticsearch
cd /data/elasticsearch

# 复制配置文件目录
docker cp elasticsearch:/usr/share/elasticsearch/config /data/elasticsearch/config
# 复制插件目录
docker cp elasticsearch:/usr/share/elasticsearch/plugins /data/elasticsearch/plugins
# 复制数据目录
docker cp elasticsearch:/usr/share/elasticsearch/data /data/elasticsearch/data

# 修改文件权限， 不然Docker容器无法写数据
cd /data
chgrp -R 1000 elasticsearch
chown -R 1000 elasticsearch

4. 重启容器

# 先移除容器
docker stop elasticsearch
docker rm elasticsearch

docker-compose的安装参考 https://segmentfault.com/a/1190000043696968

修改docker-compose.yml配置

version: "3.3"

services:
  elasticsearch:
    container_name: elasticsearch
    image: docker.elastic.co/elasticsearch/elasticsearch:8.6.2
    restart: always
    # 映射目录到宿主机
    volumes:
      - /data/elasticsearch/config:/usr/share/elasticsearch/config
      - /data/elasticsearch/data:/usr/share/elasticsearch/data
      - /data/elasticsearch/plugins:/usr/share/elasticsearch/plugins
    ports:
      - 9200:9200
      - 9300:9300
    environment:
      # 指定单节点启动
      - discovery.type=single-node
      - "ES_JAVA_OPTS=-Xms2g -Xmx8g"
      # 开启内存锁定
      - bootstrap.memory_lock=true
      # 不开启权限验证
      - xpack.security.enabled=false
#    mem_limit: ${MEM_LIMIT}
    ulimits:
      # 取消内存相关限制 用于开启内存锁定
      memlock:
        soft: -1
        hard: -1

再启动一个新的容器
docker-compose up

如需安装IK分词器， 下载解压到/data/elasticsearch/plugins， 重启ES即可;
附IK分词器各版本下载地址: https://github.com/medcl/elasticsearch-analysis-ik/releases。

问题记录

问题1

容器启动报错:

elasticsearch    | ERROR: Elasticsearch exited unexpectedly
elasticsearch exited with code 78

解决方法:

1. 修改配置
   vim /etc/sysctl.conf
   最后添加一行
   vm.max_map_count=262144
2. 更新配置
   sysctl -p
   查看更改后的值
   sysctl -a | grep vm.max_map_count