elasticsearch环境搭建的一些问题
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.yml- 1
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>直接运行bin/elasticsearch文件启动elasticsearch
[seven@localhost bin]$ cd /usr/java/elasticsearch/bin/
[seven@localhost bin]$ ./elasticsearch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 failed
initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
max 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 cluster
max 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$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:183)
at org.elasticsearch.node.Node.start(Node.java:337)
at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:198)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:96)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:91)
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:91)
at org.elasticsearch.cli.Command.main(Command.java:53)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:70)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:63)
Refer to the log for complete error details.
[2016-06-28 13:49:32,144][INFO ][node ] [Mondo] stopping ...
[2016-06-28 13:49:32,198][INFO ][node ] [Mondo] stopped
[2016-06-28 13:49:32,198][INFO ][node ] [Mondo] closing ...
[2016-06-28 13:49:32,210][INFO ][node ] [Mondo] closed于是我临时提高了vm.max_map_count的大小
*此操作需要root权限
[root@localhost ~]# sysctl -w vm.max_map_count=262144- 1
查看修改结果
[root@localhost ~]# sysctl -a|grep vm.max_map_count
vm.max_map_count = 262144或者永久性修改
[root@localhost ~]# cat /etc/sysctl.conf | grep -v "vm.max_map_count" > /tmp/system_sysctl.conf
[root@localhost ~]# echo "vm.max_map_count=262144" >> /tmp/system_sysctl.conf
[root@localhost ~]# mv /tmp/system_sysctl.conf /etc/sysctl.conf
mv：是否覆盖"/etc/sysctl.conf"？ y
[root@localhost ~]# cat /etc/sysctl.conf
# System default settings live in /usr/lib/sysctl.d/00-system.conf.
# To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
vm.max_map_count=262144
[root@localhost ~]# sysctl -p
vm.max_map_count = 262144上面还有一个错误是关于jvm内存分配的问题heap size [268435456] not equal to maximum heap size [2147483648]，需要修改的jvm配置
[seven@localhost bin]$ vim /usr/java/elasticsearch/config/jvm.options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 failed
initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
max 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] closed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>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.conf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 -Hn
65536接下来就可以使用【seven用户】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"
}或者
找到文件 /etc/security/limits.conf，编辑，在文件的最后追加如下配置：
es soft nofile 65535
es hard nofile 65537
soft nofile表示软限制，hard nofile表示硬限制，
上面两行语句表示，es用户的软限制为65535，硬限制为65537，
即表示es用户能打开的最大文件数量为65537，不管它开启多少个shell。
注意，ulimit的限制跟用户有关，改变后 需要【重启会话】，才会生效。
错误：ClusterBlockException[blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized]
可能是配置错误设置了gateway.recover_after_nodes，注释掉即可。
gateway.recover_after_nodes
Recover as long as this many data or master nodes have joined the cluster.
ps:
没有使用集群 discovery.zen.minimum_master_nodes 不用打开。
