内容简介:jasonruan 2018.12.03[TOC]Elasticsearch——You Know,For Search:),既然如此,笔者也不过多介绍,直接进入正题——
【ELK实践&开发★壹】基于 Docker 纯手工构建Elasticsearch高可用集群环境
jasonruan 2018.12.03
[TOC]
0 前言
Elasticsearch——You Know,For Search:),既然如此,笔者也不过多介绍,直接进入正题—— 基于Docker纯手工构建Elasticsearch高可用集群 。
1 Elasticsearch环境搭建
1.1 构建开发环境基础镜像
关于开发基础镜像构建,请参看笔者另外一篇文章: 《基于以太坊为女儿发一枚数字货币》 ( https://www.jianshu.com/p/455f17f4143b )
1.2 构建Elasticsearch基础镜像
基于 开发环境基础镜像
安装Elasticsearch当前 较
新版本 6.5.1(November 20, 2018)
PS:之所以用 较
新版本,因笔者准备发文前一看,才发现ES已经更新到 6.5.2(December 05, 2018)
,ES的版本发布速度也是太快了:(
1.2.1 编写Dockerfile
# js.es.Dockerfile FROM js/ubuntu:18.04 ENV ES_VERSION "6.5.1" ENV JAVA_HOME /opt/java/jdk1.8.0_181 ENV PATH $PATH:$JAVA_HOME/bin RUN mkdir -p /rzexin/soft && \ wget https://artifacts.elastic.co/downloads/Elasticsearch/Elasticsearch-$ES_VERSION.tar.gz -P /rzexin/soft && \ tar -zxvf /rzexin/soft/Elasticsearch-$ES_VERSION.tar.gz -C /rzexin/soft WORKDIR /rzexin/soft/ RUN ln -s Elasticsearch-$ES_VERSION es WORKDIR /rzexin/soft/es RUN groupadd jses && useradd jses -g jses && chown -R jses:jses /rzexin/soft USER jses RUN sed -i 's%#network.host.*$%network.host: 0.0.0.0%g' config/Elasticsearch.yml RUN mkdir /rzexin/soft/es/data ENTRYPOINT ["./bin/Elasticsearch"]
1.2.2 构建镜像
$ sudo docker build -t rzexin/es:6.5.1 -f js.es.Dockerfile .
1.3 单节点环境搭建
1.3.1 启动镜像
$ sudo docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name JS01 rzexin/es:6.5.1 a4941ef67aae56e394a7d6ada511d026fad4cba29879c3fe86f37e8120c7fe5a
1.3.2 测试验证
在宿主机执行命令,如输出如下信息,表明单节点的Elasticsearch已经启动成功:)
$ http http://localhost:9200 HTTP/1.1 200 OK content-encoding: gzip content-length: 297 content-type: application/json; charset=UTF-8 { "cluster_name": "Elasticsearch", "cluster_uuid": "V5-76-zfQmKv-JgQkjlK4Q", "name": "RDwpJOV", "tagline": "You Know, for Search", "version": { "build_date": "2018-11-16T02:22:42.182257Z", "build_flavor": "default", "build_hash": "8c58350", "build_snapshot": false, "build_type": "tar", "lucene_version": "7.5.0", "minimum_index_compatibility_version": "5.0.0", "minimum_wire_compatibility_version": "5.6.0", "number": "6.5.1" } }
1.4 高可用集群环境搭建
以下以搭建3个Elasticsearch节点的集群环境为例介绍
1.4.1 构建Elasticsearch集群镜像
1.4.1.1 编写Dockerfile
在Elasticsearch基础镜像之上构建集群镜像
主要是设置集群名称、节点名称、集群节点列表等
FROM rzexin/es:6.5.1 RUN sed -i 's%#cluster.name.*$%cluster.name: jses%g' config/elasticsearch.yml && \ sed -i 's%#discovery.zen.minimum_master_nodes:.*$%discovery.zen.minimum_master_nodes: 1%g' config/elasticsearch.yml RUN echo "[ ! -z $""NODE_NAME"" ] && sed -i 's%#node.name.*$%node.name: '$""NODE_NAME""'%g' config/elasticsearch.yml" > /rzexin/soft/es/start.sh && \ echo "[ ! -z $""DISCOVERY_HOSTS"" ] && sed -i 's%#discovery.zen.ping.unicast.hosts:.*$%discovery.zen.ping.unicast.hosts: ['$""DISCOVERY_HOSTS""']%g' config/elasticsearch.yml" >> /rzexin/soft/es/start.sh && \ echo "./bin/elasticsearch" >> /rzexin/soft/es/start.sh && \ chmod a+x /rzexin/soft/es/start.sh ENTRYPOINT ["sh", "/rzexin/soft/es/start.sh"]
1.4.1.2 构建镜像
$ sudo docker build -t rzexin/escluster:6.5.1 -f js.es.cluster.Dockerfile .
1.4.2 创建数据文件挂载目录
分别为3个节点创建数据文件挂载目录
$ sudo docker volume create --name=data-js-es-1 data-js-es-1 $ sudo docker volume create --name=data-js-es-2 data-js-es-2 $ sudo docker volume create --name=data-js-es-3 data-js-es-3
1.4.3 编写docker-compose编排文件
# cat js.es.docker-compose.yml version: "3" services: js01: build: context: . dockerfile: js.es.cluster.Dockerfile image: rzexin/escluster:6.5.1 container_name: js01 hostname: js01 privileged: true ports: - "9200:9200" - "9300:9300" expose: - 9200 - 9300 environment: NODE_NAME: "js-es-1" DISCOVERY_HOSTS: "\"js01\",\"js02\",\"js03\"" ES_JAVA_OPTS: "-Xms256m -Xmx256m" volumes: - data-js-es-1:/rzexin/soft/es/data js02: build: context: . dockerfile: js.es.cluster.Dockerfile image: rzexin/escluster:6.5.1 container_name: js02 hostname: js02 ports: - "29200:9200" - "29300:9300" expose: - 29200 - 29300 environment: NODE_NAME: "js-es-2" DISCOVERY_HOSTS: "\"js01\",\"js02\",\"js03\"" ES_JAVA_OPTS: "-Xms256m -Xmx256m" volumes: - data-js-es-2:/rzexin/soft/es/data js03: build: context: . dockerfile: js.es.cluster.Dockerfile image: rzexin/escluster:6.5.1 container_name: js03 hostname: js03 ports: - "39200:9200" - "39300:9300" expose: - 39200 - 39300 environment: NODE_NAME: "js-es-3" DISCOVERY_HOSTS: "\"js01\",\"js02\",\"js03\"" ES_JAVA_OPTS: "-Xms256m -Xmx256m" volumes: - data-js-es-3:/rzexin/soft/es/data volumes: data-js-es-1: external: true data-js-es-2: external: true data-js-es-3: external: true
1.4.4 启动集群节点
$ sudo docker-compose -f js.es.docker-compose.yml up -d Creating network "dockerescluster_default" with the default driver Creating js01 ... done Creating js03 ... done Creating js02 ... done
1.4.5 查看集群节点状态
$ sudo docker-compose -f js.es.docker-compose.yml ps Name Command State Ports ------------------------------------------------------------------------------------------------------------------- js01 sh /rzexin/soft/es/start.sh Up 0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp js02 sh /rzexin/soft/es/start.sh Up 29200/tcp, 29300/tcp, 0.0.0.0:29200->9200/tcp, 0.0.0.0:29300->9300/tcp js03 sh /rzexin/soft/es/start.sh Up 39200/tcp, 39300/tcp, 0.0.0.0:39200->9200/tcp, 0.0.0.0:39300->9300/tcp
1.4.6 测试验证
在宿主机执行命令,查看集群节点情况,打星号 *
的是自动选举出的主节点
$ curl http://localhost:9200/_cat/nodes?pretty 172.19.0.4 58 98 32 2.31 3.63 2.19 mdi - js-es-1 172.19.0.3 60 98 33 2.31 3.63 2.19 mdi * js-es-2 172.19.0.2 57 98 33 2.31 3.63 2.19 mdi - js-es-3
1.5 官方docker镜像搭建
要是不愿意折腾手工编译安装搭建,也可考虑直接使用Elasticsearch官方的docker镜像,具体步骤如下:
1.5.1 获取官方镜像
- 搜索镜像
$ sudo docker search Elasticsearch:6.5.1 NAME DESCRIPTION STARS OFFICIAL Elasticsearch Elasticsearch is a powerful open source sear… 3270 [OK] kibana Kibana gives shape to any kind of data — str… 1332 [OK]
- 下载镜像
$ sudo docker pull Elasticsearch:6.5.1 6.5.1: Pulling from library/Elasticsearch Digest: sha256:0db7521b9cd9f3906aae70fd146b78ce204b1c7c13fc32e4a2ed449e6576af53 Status: Image is up to date for Elasticsearch:6.5.1
- 查看镜像
$ sudo docker images elasticsearch REPOSITORY TAG IMAGE ID CREATED SIZE elasticsearch 6.5.1 32f93c89076d 2 weeks ago 773MB
1.5.2 运行官方镜像
- 运行镜像
运行该镜像默认会占用2G内存,受限于机器性能,故通过 ES_JAVA_OPTS
参数限制内存使用
$ sudo docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name ES01 32f93c89076d 29ff9574492ce0f3c008664fc1044851402e3594fbada62d91b4da725615fbbf
- 检查镜像
$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 29ff9574492c 32f93c89076d "/usr/local/bin/dock…" 23 seconds ago Up 22 seconds 0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp ES01
1.5.3 测试验证
看到如下输出,表示Elasticsearch启动成功
$ http 'http://localhost:9200' HTTP/1.1 200 OK content-encoding: gzip content-length: 298 content-type: application/json; charset=UTF-8 { "cluster_name": "docker-cluster", "cluster_uuid": "djDC-rsqQ9KD2hOXRP3Rew", "name": "jzqf9Oy", "tagline": "You Know, for Search", "version": { "build_date": "2018-11-16T02:22:42.182257Z", "build_flavor": "default", "build_hash": "8c58350", "build_snapshot": false, "build_type": "tar", "lucene_version": "7.5.0", "minimum_index_compatibility_version": "5.0.0", "minimum_wire_compatibility_version": "5.6.0", "number": "6.5.1" } }
2 容灾验证
-
查看当前集群节点情况
打星号
*
的是自动选举出的主节点
$ curl http://localhost:9200/_cat/nodes?pretty 172.19.0.4 58 98 32 2.31 3.63 2.19 mdi - js-es-1 172.19.0.3 60 98 33 2.31 3.63 2.19 mdi * js-es-2 172.19.0.2 57 98 33 2.31 3.63 2.19 mdi - js-es-3
-
停掉2号主节点(
js-es-2
)$ sudo docker-compose -f js.es.docker-compose.yml stop js02 Stopping js02 ... done
-
查看集群节点情况
可见2号主节点(
js-es-2
)已被剔掉,并重新选举出了新的主节点$ curl http://localhost:9200/_cat/nodes?pretty 172.23.0.4 48 90 22 1.01 2.86 2.64 mdi * js-es-3 172.23.0.3 56 90 22 1.01 2.86 2.64 mdi - js-es-1
-
启动2号节点(
js-es-2
)$ sudo docker-compose -f js.es.docker-compose.yml start js02 Starting js02 ... done
-
再次查看集群节点情况
可见2号节点又重新加入集群,但这时已经不是主节点了
$ curl http://localhost:9200/_cat/nodes?pretty 172.23.0.2 43 98 31 1.58 2.25 2.43 mdi - js-es-2 172.23.0.4 51 98 31 1.58 2.25 2.43 mdi * js-es-3 172.23.0.3 58 98 31 1.58 2.25 2.43 mdi - js-es-1
3 常见错误
3.1 错误:can not run elasticsearch as root
-
错误描述
执行Elasticsearch启动命令报错
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
-
错误原因
出于系统安全考虑,不可使用root用户启动,因Elasticsearch可以接收用户输入的脚本并且执行,为了系统安全考虑,建议创建一个单独的用户用来运行Elasticsearch。
-
解决方案
创建用户和分组,并使用该用户启动es
groupadd jses useradd jses -g jses chown -R jses:jses /rzexin/soft/es su jses ./bin/elasticsearch
3.2 错误:vm.max_map_count is too low
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
(1)临时修改
- 在宿主机上执行命令
# 查看当前值 $ sudo sysctl -a | grep "vm.max_map_count" vm.max_map_count = 65530 # 修改成最低要求 $ sudo sysctl -w vm.max_map_count=262144 vm.max_map_count = 262144 # 查看修改后的值 $ sudo sysctl -a | grep "vm.max_map_count" vm.max_map_count = 262144
- 重启docker镜像
# 先删除容器,否则报错 $ sudo docker run -e ES_JAVA_OPTS="-Xms512m -Xmx512m" -d -p 9200:9200 -p 9300:9300 --name ES01 32f93c89076d docker: Error response from daemon: Conflict. The container name "/ES01" is already in use by container "a9e2daa0227bb60a7ce3fffd0881eb7d4caa2b032c3933f52fb6a5bcd55def12". You have to remove (or rename) that container to be able to reuse that name. See 'docker run --help'. $ sudo docker ps -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a9e2daa0227b 32f93c89076d "/usr/local/bin/dock…" 6 minutes ago Exited (78) 6 minutes ago ES01 $ sudo docker rm a9e2daa0227b a9e2daa0227b # 重启镜像 $ sudo docker run -e ES_JAVA_OPTS="-Xms512m -Xmx512m" -d -p 9200:9200 -p 9300:9300 --name ES01 32f93c89076d 6749988a01723a1ba9079066274676fbdd302866011e8158a70729b0b98de11b
(2)永久修改
修改配置文件: sudo vi /etc/sysctl.conf
加入:
vm.max_map_count=262144
保存即可。
4 后记
完成了Elasticsearch集群环境搭建,下一篇将介绍Elasticsearch与SpringBoot和Golang的整合。
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