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+---
+title: "CentOS7 安装 elasticsearch 集群"
+date: 2019-10-30T01:19:09+08:00
+lastmod: 2019-10-30T01:19:09+08:00
+keywords: []
+tags: ["elasticsearch", "centos"]
+categories: ["database"]
+---
+
+# 环境
+
+主机名 | IP | 操作系统 | ES 版本
+---- | ---- | ---- | ----
+es227 | 192.168.1.227 | CentOS7.5 | 6.5.4
+es228 | 192.168.1.228 | CentOS7.5 | 6.5.4
+es229 | 192.168.1.229 | CentOS7.5 | 6.5.4
+
+- 下载 [elasticsearch-6.5.4.tar.gz](https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.tar.gz)
+
+# 各节点初始配置
+
+- 关闭 selinux、防火墙
+- 部署 java 运行环境
+- 创建 elastic 用户
+    ```
+    useradd -m elastic
+    ```
+- 创建数据目录
+    ```
+    cd /var/lib
+    mkdir elasticsearch
+    chown elastic.elastic elasticsearch
+    ```
+- 创建日志目录
+    ```
+    cd /var/log
+    mkdir -p elasticsearch
+    chown elastic.elastic elasticsearch
+    ```
+- 增加 sysctl.conf 配置，执行 sysctl -p 生效
+    ```
+    vm.max_map_count = 262144
+    ```
+- 增加 /etc/security/limits.conf 配置
+    ```
+    elastic soft nofile 65536
+    elastic hard nofile 65536
+    elastic soft memlock unlimited
+    elastic hard memlock unlimited
+    ```
+
+# 部署 ELASTICSEARCH
+
+- 登陆 es227，下载 elasticsearch，解压至 /opt/ 下
+- 修改 elasticsearch 目录的权限
+    ```
+    chown -R elastic.elastic /opt/elasticsearch
+    ```
+- 修改 jvm 参数文件 /opt/elasticsearch/config/jvm.options
+- 修改 /opt/elsaticsearch/config/elasticsearch.yml
+    ```
+    cluster.name: TEST_ES_CLUSTER
+    node.name: es227
+    network.host: 192.168.1.227
+    path.data: /var/lib/elasticsearch
+    path.logs: /var/log/elasticsearch
+    bootstrap.memory_lock: true
+    discovery.zen.ping.unicast.hosts: ["192.168.1.227:9300", "192.168.1.228:9300", "192.168.1.229:9300"]
+    discovery.zen.minimum_master_nodes: 2
+    gateway.recover_after_nodes: 2
+    ```
+- 打包 elasticsearch 目录，复制到 es228 和 es229 上，并修改 elasticsearch.yml
+    ```
+    # es228
+    node.name: es228
+    network.host: 192.168.1.228
+    # es229
+    node.name: es229
+    network.host: 192.168.1.229
+    ```
+
+# 启动集群(两种启动方式)
+
+- 直接启动二进制
+    - 在每个节点上启动 elasticsearch 服务
+        ```bash
+        su - elastic -c '/opt/elasticsearch/bin/elasticsearch -d'
+        ```
+- systemd 启动
+    - 创建文件 /usr/lib/systemd/system/elasticsearch.service，内容如下
+        ```
+        [Unit]
+        Description=ElasticSearch
+        Requires=network.service
+        After=network.service
+        [Service]
+        User=elastic
+        Group=elastic
+        LimitNOFILE=65536
+        LimitMEMLOCK=infinity
+        Environment=JAVA_HOME=/opt/jre
+        ExecStart=/opt/elasticsearch/bin/elasticsearch
+        SuccessExitStatus=143
+        [Install]
+        WantedBy=multi-user.target
+        ```
+    - 启动 elasticsearch 服务
+        ```bash
+        systemctl daemon-reload
+        systemctl start elasticsearch
+        ```
+
+# 查看集群状态
+
+- 查看集群节点状态
+    ```
+    # 查看节点状态
+    curl http://192.168.1.228:9200/_cat/nodes?pretty
+    # 查看集群状态
+    curl http://192.168.1.228:9200/_cluster/state?pretty
+    ```
+
+# 安装分词插件
+
+- 登陆 es227，下载插件 [elasticsearch-analysis-ik-6.5.4.zip](https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.5.4/elasticsearch-analysis-ik-6.5.4.zip) 至根目录下
+- 复制该文件至 es228 和 es229 的根目录下
+- 每个节点上安装
+    ```
+    su - elastic
+    /opt/elasticsearch/bin/elasticsearch-plugin install file:///elasticsearch-analysis-ik-6.5.4.zip
+    ```
+- 配置远程扩展字典时，出现 java.net.SocketPermission 拒绝连接，此时需配置 jre 策略
+    ```
+    # vim /opt/jre/lib/security/java.policy，在最后一个 "}" 前追加下面一行
+    permission java.net.SocketPermission "*:*","accept,connect,resolve";
+    ```
+