elasticsearch环境搭建的一些问题

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elasticsearch必须用jdk1.8启动且，不能使用root账户启动。

因此新建用户:es，然后启动。

报错:

Exception in thread "main" SettingsException[Failed to load settings from /usr/local/elasticsearch/config/elasticsearch.yml]; nested: AccessDeniedException[/usr/local/elasticsearch/config/elasticsearch.yml];

将目录所有者换成启动elasticsearch的那个用户。我这里用户为es

chown -R elasticsearch es:es

其他参考:http://www.cnblogs.com/sloveling/p/elasticsearch.html

Elasticsearch5.0 安装问题集锦

elasticsearch 5.0 安装过程中遇到了一些问题，通过查找资料几乎都解决掉了，这里简单记录一下，供以后查阅参考，也希望可以帮助遇到同样问题的你。

问题一：警告提示

[2016-11-06T16:27:21,712][WARN ][o.e.b.JNANatives ] unable to install syscall filter:

java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
at org.elasticsearch.bootstrap.Seccomp.linuxImpl(Seccomp.java:349) ~[elasticsearch-5.0.0.jar:5.0.0]
at org.elasticsearch.bootstrap.Seccomp.init(Seccomp.java:630) ~[elasticsearch-5.0.0.jar:5.0.0]

报了一大串错误，其实只是一个警告。

解决：使用心得linux版本，就不会出现此类问题了。

问题二：ERROR: bootstrap checks failed

max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]
max number of threads [1024] for user [lishang] likely too low, increase to at least [2048]

解决：切换到root用户，编辑limits.conf 添加类似如下内容

vi /etc/security/limits.conf

添加如下内容:

* soft nofile 65536

* hard nofile 131072

* soft nproc 2048

* hard nproc 4096

问题三：max number of threads [1024] for user [lish] likely too low, increase to at least [2048]

解决：切换到root用户，进入limits.d目录下修改配置文件。

vi /etc/security/limits.d/90-nproc.conf

修改如下内容：

* soft nproc 1024

#修改为

* soft nproc 2048

问题四：max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

解决：切换到root用户修改配置sysctl.conf

vi /etc/sysctl.conf

添加下面配置：

vm.max_map_count=655360

并执行命令：

sysctl -p

然后，重新启动elasticsearch，即可启动成功。

如果没有生效，请重启服务器试试。

参考：http://blog.csdn.net/u012371450/article/details/51776505

修改访问elasticsearch的IP及端口

[seven@localhost config]$ vim /usr/java/elasticsearch/config/elasticsearch.yml1

找到如下代码段，并取消network.host及http.port所在行的注释，修改IP及端口

# ---------------------------------- Network -----------------------------------## Set the bind address to a specific IP (IPv4 or IPv6):#network.host: 192.168.0.155## Set a custom port for HTTP:#http.port: 9200## For more information, see the documentation at:# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html>1
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直接运行bin/elasticsearch文件启动elasticsearch

[seven@localhost bin]$ cd /usr/java/elasticsearch/bin/[seven@localhost bin]$ ./elasticsearch1
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启动时发现报错了。。。

[seven@localhost bin]$ ./elasticsearch[2016-06-28 13:49:27,899][INFO ][node                     ] [Mondo] version[5.0.0-alpha3], pid[3671], build[cad959b/2016-05-26T08:25:57.564Z], OS[Linux/3.10.0-327.el7.x86_64/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1  .0_91/25.91-b14]▽2016-06-28 13:49:27,900][INFO ][node                     ] [Mondo] initializing ...[2016-06-28 13:49:28,941][INFO ][plugins                  ] [Mondo] modules [percolator, lang-mustache, lang-painless, ingest-grok, reindex, lang-expression, lang-groovy], plugins [][2016-06-28 13:49:28,963][INFO ][env                      ] [Mondo] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [15.7gb], net total_space [17.4gb], spins? [unknown], types [rootfs][2016-06-28 13:49:28,963][INFO ][env                      ] [Mondo] heap size [1.9gb], compressed ordinary object pointers [true][2016-06-28 13:49:31,980][INFO ][node                     ] [Mondo] initialized[2016-06-28 13:49:31,980][INFO ][node                     ] [Mondo] starting ...[2016-06-28 13:49:32,115][INFO ][transport                ] [Mondo] publish_address {192.168.0.155:9300}, bound_addresses {192.168.0.155:9300}Exception in thread "main" java.lang.RuntimeException: bootstrap checks failedinitial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heapmax file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your clustermax virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:125)        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)        at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:183)        at org.elasticsearch.node.Node.start(Node.java:337)        at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:198)        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:96)        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:91)        at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:91)        at org.elasticsearch.cli.Command.main(Command.java:53)        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:70)        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:63)Refer to the log for complete error details.[2016-06-28 13:49:32,144][INFO ][node                     ] [Mondo] stopping ...[2016-06-28 13:49:32,198][INFO ][node                     ] [Mondo] stopped[2016-06-28 13:49:32,198][INFO ][node                     ] [Mondo] closing ...[2016-06-28 13:49:32,210][INFO ][node                     ] [Mondo] closed1
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于是我临时提高了vm.max_map_count的大小
*此操作需要root权限

[root@localhost ~]# sysctl -w vm.max_map_count=2621441

查看修改结果

[root@localhost ~]# sysctl -a|grep vm.max_map_countvm.max_map_count = 2621441
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或者永久性修改

[root@localhost ~]# cat /etc/sysctl.conf | grep -v "vm.max_map_count" > /tmp/system_sysctl.conf[root@localhost ~]# echo "vm.max_map_count=262144" >> /tmp/system_sysctl.conf[root@localhost ~]# mv /tmp/system_sysctl.conf /etc/sysctl.confmv：是否覆盖"/etc/sysctl.conf"？ y[root@localhost ~]# cat /etc/sysctl.conf# System default settings live in /usr/lib/sysctl.d/00-system.conf.# To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file## For more information, see sysctl.conf(5) and sysctl.d(5).vm.max_map_count=262144[root@localhost ~]# sysctl -pvm.max_map_count = 2621441
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上面还有一个错误是关于jvm内存分配的问题heap size [268435456] not equal to maximum heap size [2147483648]，需要修改的jvm配置

[seven@localhost bin]$ vim /usr/java/elasticsearch/config/jvm.options1

将-Xmx2g改成-Xmx256m，也就是heap size [268435456] /1024/1024的值

又有新的错误。。。

Exception in thread "main" java.lang.RuntimeException: bootstrap checks failedinitial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heapmax file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]memory locking requested for elasticsearch process but memory is not locked        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:125)        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)        at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:183)        at org.elasticsearch.node.Node.start(Node.java:337)        at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:198)        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:96)        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:91)        at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:91)        at org.elasticsearch.cli.Command.main(Command.java:53)        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:70)        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:63)Refer to the log for complete error details.[2016-06-28 14:55:49,770][INFO ][node                     ] [Goldbug] stopping ...[2016-06-28 14:55:49,875][INFO ][node                     ] [Goldbug] stopped[2016-06-28 14:55:49,875][INFO ][node                     ] [Goldbug] closing ...[2016-06-28 14:55:49,887][INFO ][node                     ] [Goldbug] closed1
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这个问题折腾了我一下午，最后还是找到了解决方案，同样回到config/elasticsearch.yml文件，找到如下配置，开放discovery.zen.ping.unicast.hosts及discovery.zen.minimum_master_nodes

# --------------------------------- Discovery ----------------------------------## Pass an initial list of hosts to perform discovery when new node is started:# The default list of hosts is ["127.0.0.1", "[::1]"]#discovery.zen.ping.unicast.hosts: ["192.168.0.155"]## Prevent the "split brain" by configuring the majority of nodes (total number of nodes / 2 + 1):#discovery.zen.minimum_master_nodes: 3## For more information, see the documentation at:# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html>1
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然后修改max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]这个错误（切换到root操作）

[root@localhost ~]# cp /etc/security/limits.conf /etc/security/limits.conf.bak[root@localhost ~]# cat /etc/security/limits.conf | grep -v "seven" > /tmp/system_limits.conf[root@localhost ~]# echo "seven hard nofile 65536" >> /tmp/system_limits.conf [root@localhost ~]# echo "seven soft nofile 65536" >> /tmp/system_limits.conf [root@localhost ~]# mv /tmp/system_limits.conf /etc/security/limits.conf1
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修改后重新登录seven用户，使用如下命令查看是否修改成功

[seven@localhost ~]$ ulimit -Hn655361
2

接下来就可以启动elasticsearch了，启动完成使用浏览器访问http://192.168.0.155:9200

{  "name" : "Vampire by Night",  "cluster_name" : "elasticsearch",  "version" : {    "number" : "5.0.0-alpha3",    "build_hash" : "cad959b",    "build_date" : "2016-05-26T08:25:57.564Z",    "build_snapshot" : false,    "lucene_version" : "6.0.0"  },  "tagline" : "You Know, for Search"}

ps:

没有使用集群 discovery.zen.minimum_master_nodes 不用打开。

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