Elasticsearch安装教程

1.1 基础环境

OS:Centos7.4

ES: elasticsearch-6.2.4.tar.gz

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.4.tar.gz

执行解压命令：

tar -zxvf elasticsearch-6.2.4.tar.gz

解压完成后，会出现elasticsearch-6.2.4目录。

如果你是root用户启动的话，会报"can not run elasticsearch as root"的错误。因为安全问题elasticsearch不让用root用户直接运行，所以要创建新用户。

groupadd uncle

useradd -m -g uncle uncle

    -r代码创建系统用户，-m代表创建用户主目录

passwd uncle

WXHWXH

root用户赋权：

mv /root/elasticsearch-6.2.4/ /home/uncle/

chown -R uncle.uncle /home/uncle/elasticsearch-6.2.4

uncle用户：

/home/uncle/elasticsearch-6.2.4/bin/elasticsearch

nohup /home/uncle/elasticsearch-6.2.4/bin/elasticsearch &

[2019-12-31T16:00:47,993][INFO ][o.e.n.Node               ] [] initializing ...

[2019-12-31T16:00:48,092][INFO ][o.e.e.NodeEnvironment    ] [HCMjxVu] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [25.5gb], net total_space [36.9gb], types [rootfs]

[2019-12-31T16:00:48,092][INFO ][o.e.e.NodeEnvironment    ] [HCMjxVu] heap size [990.7mb], compressed ordinary object pointers [true]

[2019-12-31T16:00:48,093][INFO ][o.e.n.Node               ] node name [HCMjxVu] derived from node ID [HCMjxVuFTWeojN_O0MKlog]; set [node.name] to override

[2019-12-31T16:00:48,094][INFO ][o.e.n.Node               ] version[6.2.4], pid[20253], build[ccec39f/2018-04-12T20:37:28.497551Z], OS[Linux/3.10.0-693.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/1.8.0_131/25.131-b12]

[2019-12-31T16:00:48,094][INFO ][o.e.n.Node               ] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch.T9V2sUZv, -XX:+HeapDumpOnOutOfMemoryError, -XX:+PrintGCDetails, -XX:+PrintGCDateStamps, -XX:+PrintTenuringDistribution, -XX:+PrintGCApplicationStoppedTime, -Xloggc:logs/gc.log, -XX:+UseGCLogFileRotation, -XX:NumberOfGCLogFiles=32, -XX:GCLogFileSize=64m, -Des.path.home=/home/uncle/elasticsearch-6.2.4, -Des.path.conf=/home/uncle/elasticsearch-6.2.4/config]

[2019-12-31T16:00:48,926][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [aggs-matrix-stats]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [analysis-common]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [ingest-common]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [lang-expression]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [lang-mustache]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [lang-painless]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [mapper-extras]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [parent-join]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [percolator]

[2019-12-31T16:00:48,927][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [rank-eval]

[2019-12-31T16:00:48,928][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [reindex]

[2019-12-31T16:00:48,928][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [repository-url]

[2019-12-31T16:00:48,928][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [transport-netty4]

[2019-12-31T16:00:48,928][INFO ][o.e.p.PluginsService     ] [HCMjxVu] loaded module [tribe]

[2019-12-31T16:00:48,928][INFO ][o.e.p.PluginsService     ] [HCMjxVu] no plugins loaded

[2019-12-31T16:00:51,685][INFO ][o.e.d.DiscoveryModule    ] [HCMjxVu] using discovery type [zen]

[2019-12-31T16:00:52,290][INFO ][o.e.n.Node               ] initialized

[2019-12-31T16:00:52,290][INFO ][o.e.n.Node               ] [HCMjxVu] starting ...

[2019-12-31T16:00:52,443][INFO ][o.e.t.TransportService   ] [HCMjxVu] publish_address {127.0.0.1:9300}, bound_addresses {[::1]:9300}, {127.0.0.1:9300}

[2019-12-31T16:00:52,451][WARN ][o.e.b.BootstrapChecks    ] [HCMjxVu] max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

[2019-12-31T16:00:52,452][WARN ][o.e.b.BootstrapChecks    ] [HCMjxVu] max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

[2019-12-31T16:00:55,595][INFO ][o.e.c.s.MasterService    ] [HCMjxVu] zen-disco-elected-as-master ([0] nodes joined), reason: new_master {HCMjxVu}{HCMjxVuFTWeojN_O0MKlog}{eNjvUmmeRU6Jc7-0lcz8rA}{127.0.0.1}{127.0.0.1:9300}

[2019-12-31T16:00:55,601][INFO ][o.e.c.s.ClusterApplierService] [HCMjxVu] new_master {HCMjxVu}{HCMjxVuFTWeojN_O0MKlog}{eNjvUmmeRU6Jc7-0lcz8rA}{127.0.0.1}{127.0.0.1:9300}, reason: apply cluster state (from master [master {HCMjxVu}{HCMjxVuFTWeojN_O0MKlog}{eNjvUmmeRU6Jc7-0lcz8rA}{127.0.0.1}{127.0.0.1:9300} committed version [1] source [zen-disco-elected-as-master ([0] nodes joined)]])

[2019-12-31T16:00:55,625][INFO ][o.e.h.n.Netty4HttpServerTransport] [HCMjxVu] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200}

[2019-12-31T16:00:55,626][INFO ][o.e.n.Node               ] [HCMjxVu] started

[2019-12-31T16:00:55,630][INFO ][o.e.g.GatewayService     ] [HCMjxVu] recovered [0] indices into cluster_state

如果一切正常，Elasticsearch就会在默认的9200端口运行。这时，打开另一个命令行窗口，请求该端口：

curl localhost:9200

如果得到如下的返回，就说明启动成功了：

[root@pxc1 ~]# curl localhost:9200

{

  "name" : "HCMjxVu",

  "cluster_name" : "elasticsearch",

  "cluster_uuid" : "HLRiDRQzT7KUeVFzoZuyjg",

  "version" : {

    "number" : "6.2.4",

    "build_hash" : "ccec39f",

    "build_date" : "2018-04-12T20:37:28.497551Z",

    "build_snapshot" : false,

    "lucene_version" : "7.2.1",

    "minimum_wire_compatibility_version" : "5.6.0",

    "minimum_index_compatibility_version" : "5.0.0"

  },

  "tagline" : "You Know, for Search"

}

默认情况下，Elasticsearch 只允许本机访问，如果需要远程访问，可以修改 Elasticsearch 安装目录中的config/elasticsearch.yml文件，去掉network.host的注释，将它的值改成0.0.0.0，让任何人都可以访问，然后重新启动 Elasticsearch 。

vi /home/uncle/elasticsearch-6.2.4/config/elasticsearch.yml

55 network.host: 0.0.0.0

上面代码中，"network.host:"和"0.0.0.0"中间有个空格，不能忽略，不然启动会报错。线上服务不要这样设置，要设成具体的 IP。

错误一：max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

解决：执行下面的命令：

sudo sysctl -w vm.max_map_count=262144

错误二：max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

sudo vim /etc/security/limits.conf

在limits.conf最下方加入下面两行（这里的yjclsx是之前2.4步骤中新建的用户名）：

uncle hard nofile 65536

uncle soft nofile 65536