Linux环境快速搭建elasticsearch6.5.4集群和Head插件

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Linux环境快速搭建elasticsearch6.5.4集群和Head插件

Linux环境快速搭建elasticsearch6.5.4集群和Head插件

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今天来一起实战Linux环境下搭建elasticsearch6.5.4集群和Head插件;

环境信息

操作系统:Ubuntu 16.04.5 LTS JDK:1.8.0_191 elasticsearch:6.5.4 nodejs:v10.15.0 本次实战准备了两台机器,它们的基本情况如下所示:

IP地址 hostname 备注
192.168.119.152 node-0 节点0
192.168.119.153 node-1 节点1

操作步骤整理

整个实战由以下操作步骤组成,注意:有的步骤需要在两台机器上都要做,在具体操作的地方,我会用红字说明 :

修改主机名; 修改hosts; 修改linux文件描述符限制; 修改最大线程数限制; 修改内存限制; 安装JDK; 创建用户; 给es用户增加sudo权限 安装elasticsearch; 在node-0机器安装nodejs 设置elasticsearch; 启动elasticsearch 安装head组件(只在node-0上安装) 验证

修改主机名

注意:以下的操作在node-0和node-1两台机器上都要做 打开文件/etc/hostname,将内容修改为本次实战所需的hostname(node-0和node-1);

修改hosts

注意:以下的操作在node-0和node-1两台机器上都要做 打开文件令/etc/hosts,增加以下两行,读者请注意改为自己机器的IP地址:

192.168.119.152 node-0 192.168.119.153 node-1

修改linux文件描述符限制

注意:以下的操作在node-0和node-1两台机器上都要做 执行命令ulimit -Hn,查看硬限制:

[root@localhost es]# ulimit -Hn 4096

执行命令ulimit -Sn,查看软限制(程序中可以提升):

[root@localhost es]# ulimit -Sn 1024

上述限制会导致elasticsearch启动失败,所以需要调整; 打开文件/etc/security/limits.conf,增加以下两行设置(注意,如果是已有配置就修改对应的值):

* soft nofile 65536 * hard nofile 65536

修改完成后退出重新登录,再次查看发现配置已经生效:

[root@localhost ~]# ulimit -Hn 65536 [root@localhost ~]# ulimit -Sn 65536

修改最大线程数限制

注意:以下的操作在node-0和node-1两台机器上都要做 打开文件/etc/security/limits.conf,增加以下两行设置(注意,如果是已有配置就修改对应的值):

* soft nproc 4096 * hard nproc 4096

修改完毕后,需要重启才会生效;

修改内存限制

注意:以下的操作在node-0和node-1两台机器上都要做 修改进程中内存映射区域的最大数量,修改/etc/sysctl.conf文件,增加以下配置(注意,如果是已有配置就修改对应的值):

vm.max_map_count=262144

修改完成后,重启生效;

安装JDK

注意:以下的操作在node-0和node-1两台机器上都要做 在官网-JDK,地址是,在上面选择合适的版本-; 将-的JDK安装文件放在目录/usr/lib/jvm,解压; 我这边JDK解压后的完整路径是/usr/lib/jvm/jdk1.8.0_191,在/etc/profile文件增加以下内容:

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_191 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH

修改完毕后执行命令source /etc/profile使设置立即生效,执行java -version查看设置是否成功:

[root@localhost jdk1.8.0_191]# java -version java version "1.8.0_191" Java(TM) SE Runtime Environment (build 1.8.0_191-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

创建用户

注意:以下的操作在node-0和node-1两台机器上都要做 es不允许root用户启动应用,因此需要创建用户: 执行命令useradd es,即可创建用户es; 执行命令passwd es,按照提示修改用户密码;

给es用户增加sudo权限

注意:以下的操作在node-0和node-1两台机器上都要做 给文件/etc/sudoers增加写权限:

chmod a+w /etc/sudoers

打开文件/etc/sudoers; 增加以下一行内容:

es ALL=(ALL:ALL) ALL

保存后,修改sudoers文件的权限:

chmod 440 /etc/sudoers

安装elasticsearch

注意:以下的操作在node-0和node-1两台机器上都要做 在官网-安装包,地址是:https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.tar.gz 解压后的完整目录是/usr/local/work/es/elasticsearch-6.5.4,执行以下命令将文件夹的所有者和群组设置为es:

chown -R es:es /usr/local/work/es/elasticsearch-6.5.4

执行ls命令确认一下所属用户和群组:

root@node-0:/usr/local/work/es# ls -al total 12 drwxr-xr-x 3 root root 4096 Jan 11 18:54 . drwxr-xr-x 6 root root 4096 Jan 11 18:43 .. drwxr-xr-x 8 es es 4096 Dec 17 13:21 elasticsearch-6.5.4

在node-0机器安装nodejs

在node-0机器安装nodejs,详细的操作步骤请参照文章《Ubuntu16安装nodejs10》,其实就是-、解压、设置等操作,很快就能完成; 执行以下命令,确保es账号能访问nodejs目录,是nodejs安装的目录:

sudo chmod 777 -R /usr/local/work/nodejs/node-v10.15.0-linux-x64

设置elasticsearch

打开node-0机器的文件,新增或者修改以下配置信息:

参数名 参数值 作用
cluster.name boling_cavalry 集群名称
node.name node-0 节点名字
network.host 0.0.0.0 绑定IP
http.port 9200 服务端口
discovery.zen.ping.unicast.hosts ["node-0", "node-1"] 集群节点主机的host
discovery.zen.minimum_master_nodes 1 一个节点需要看到的具有master节点资格的最小数量,<br>当前有两台机器,只能设置为1
http.cors.enabled true head插件配置
http.cors.allow-origin "*" head插件配置

打开node-1机器的文件,新增或者修改以下配置信息:

参数名 参数值 作用
cluster.name boling_cavalry 集群名称
node.name node-1 节点名字
network.host 0.0.0.0 绑定IP
http.port 9200 服务端口
discovery.zen.ping.unicast.hosts ["node-0", "node-1"] 集群节点主机的host
discovery.zen.minimum_master_nodes 1 一个节点需要看到的具有master节点资格的最小数量,<br>当前有两台机器,只能设置为1
http.cors.enabled true head插件配置
http.cors.allow-origin "*" head插件配置

两台机器的配置中,只有node.name这个参数的值不同,其他的一模一样,在node-0机器上修改后的elasticsearch.yml文件如下所示:

启动elasticsearch

如果当前用户是root,执行命令su - es,切换到es用户; 执行以下命令启动node-0的elasticsearch:

/usr/local/work/es/elasticsearch-6.5.4/bin/elasticsearch

在node-1机器上执行步骤1和2,node-1的elasticsearch启动成功后,在node-0的控制台可以看到node-1加入集群的信息如下:

[2019-01-11T19:54:02,548][INFO ][o.e.c.s.MasterService ] [node-0] zen-disco-node-join[{node-1}{bYrSztiTTzOi_SLAW_UdkA}{pC5ozVjZQF-jtHTWwyOXJA}{192.168.119.153}{192.168.119.153:9300}{ml.machine_memory=2078556160, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true}], reason: added {{node-1}{bYrSztiTTzOi_SLAW_UdkA}{pC5ozVjZQF-jtHTWwyOXJA}{192.168.119.153}{192.168.119.153:9300}{ml.machine_memory=2078556160, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true},} [2019-01-11T19:54:03,206][INFO ][o.e.c.s.ClusterApplierService] [node-0] added {{node-1}{bYrSztiTTzOi_SLAW_UdkA}{pC5ozVjZQF-jtHTWwyOXJA}{192.168.119.153}{192.168.119.153:9300}{ml.machine_memory=2078556160, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true},}, reason: apply cluster state (from master [master {node-0}{Qc3orkESRHSTTySc2DSJyA}{p0rWBQu_TweRS3TofB4NMA}{192.168.119.152}{192.168.119.152:9300}{ml.machine_memory=2078556160, xpack.installed=true, ml.max_open_jobs=20, ml.enabled=true} committed version [15] source [zen-disco-node-join[{node-1}{bYrSztiTTzOi_SLAW_UdkA}{pC5ozVjZQF-jtHTWwyOXJA}{192.168.119.153}{192.168.119.153:9300}{ml.machine_memory=2078556160, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true}]]]) [2019-01-11T19:54:03,209][WARN ][o.e.d.z.ElectMasterService] [node-0] value for setting "discovery.zen.minimum_master_nodes" is too low. This can result in data loss! Please set it to at least a quorum of master-eligible nodes (current value: [1], total number of master-eligible nodes used for publishing in this round: [2])

在浏览器上访问192.168.119.153:9300,可以返回基本信息如下图所示:

至此,elasticsearch集群搭建成功,接下来安装head组件;

安装head组件(只在node-0上安装)

-插件,地址:https://github.com/mobz/elasticsearch-head 可以用git clone命令-,也可以在网页上-,如下图所示:

-到本地的是个名为elasticsearch-head-master的文件夹,放在目录/usr/local/work/es之下; 确保文件夹的权限属于用户es,以下命令以root账号身份执行:

chown -R es:es /usr/local/work/es/elasticsearch-head-master

以es账号的身份,在elasticsearch-head-master文件夹下执行命令npm install -g grunt-cli:

$ cd ../es/elasticsearch-head-master/ $ npm install -g grunt-cli /usr/local/work/nodejs/node-v10.15.0-linux-x64/bin/grunt -> /usr/local/work/nodejs/node-v10.15.0-linux-x64/lib/node_modules/grunt-cli/bin/grunt + grunt-cli@1.3.2 added 152 packages from 122 contributors in 18.241s

上述命令安装了grunt-cli,是用于构建的,接下来安装head; 在elasticsearch-head-master文件夹下执行命令npm install,用于安装head,由于网络问题有可能安装失败,提示信息类似以下:

$ npm install npm WARN deprecated coffee-script@1.10.0: CoffeeScript on NPM has moved to "coffeescript" (no hyphen) npm WARN deprecated Use the built-in module in node 9.0.0 or newer, instead > phantomjs-prebuilt@2.1.16 install /usr/local/work/es/elasticsearch-head-master/node_modules/phantomjs-prebuilt > node install.js PhantomJS not found on PATH Downloading https://github.com/Medium/phantomjs/releases/download/v2.1.1/phantomjs-2.1.1-linux-x86_64.tar.bz2 Saving to /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2 Receiving... Error making request. Error: connect ECONNREFUSED 52.216.82.80:443 at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1117:14) Please report this full log at https://github.com/Medium/phantomjs npm WARN elasticsearch-head@0.0.0 license should be a valid SPDX license expression npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"}) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! phantomjs-prebuilt@2.1.16 install: `node install.js` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the phantomjs-prebuilt@2.1.16 install script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! /.npm/_logs/2019-01-12T05_41_50_161Z-debug.log

出现此问题时建议重试几次,成功后的提示信息如下:

$ npm install > phantomjs-prebuilt@2.1.16 install /usr/local/work/es/elasticsearch-head-master/node_modules/phantomjs-prebuilt > node install.js PhantomJS not found on PATH Downloading https://github.com/Medium/phantomjs/releases/download/v2.1.1/phantomjs-2.1.1-linux-x86_64.tar.bz2 Saving to /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2 Receiving... [=====================================---] 93% Received 22866K total. Extracting tar contents (via spawned process) Removing /usr/local/work/es/elasticsearch-head-master/node_modules/phantomjs-prebuilt/lib/phantom Copying extracted folder /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2-extract-1547271795685/phantomjs-2.1.1-linux-x86_64 -> /usr/local/work/es/elasticsearch-head-master/node_modules/phantomjs-prebuilt/lib/phantom Writing location.js file Done. Phantomjs binary available at /usr/local/work/es/elasticsearch-head-master/node_modules/phantomjs-prebuilt/lib/phantom/bin/phantomjs npm notice created a lockfile as package-lock.json. You should commit this file. npm WARN elasticsearch-head@0.0.0 license should be a valid SPDX license expression npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"}) added 67 packages from 69 contributors and audited 1751 packages in 16.681s found 24 vulnerabilities (17 low, 1 moderate, 6 high) run `npm audit fix` to fix them, or `npm audit` for details

在elasticsearch-head-master文件夹下执行命令grunt server,启动head,控制台提示如下:

$ grunt server Running "connect:server" (connect) task Waiting forever... Started connect web server on http://localhost:9100

验证

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