elasticsearch启动常见问题

原文：https://blog.csdn.net/qq_22211217/article/details/80740873

一、Exception in thread "main" SettingsException[Failed to load settings from [elasticsearch.yml]]; nested: ElasticsearchParseException[malformed, expected settings to start with 'object', instead was [VALUE_STRING]];
原因：elasticsearch.yml文件错误
解决：参数与参数值等号间需要空格

node.name ="node"  ##错误
node.name = "node" ##正确

二、org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

详细错误：

OpenJDK -Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads a
[--20T02::,][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:) ~[elasticsearch-cli-6.3..jar:6.3.]
    at org.elasticsearch.cli.Command.main(Command.java:) ~[elasticsearch-cli-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    ...  more

原因：处于对root用户的安全保护，需要使用其他用户组进行授权启动
解决：
step1:用户组进行授权启动

    groupadd elsearch
    useradd elsearch -g elsearch -p elasticsearch
    chown -R elsearch:elsearch  elasticsearch-6.3.

    备注： 添加用户组 elsearch
          添加用户 elsearch 密码为 elasticsearch 到用户组 elsearch
          将elsearch安装目录授权给 用户组：用户  即 elsearch：elsearch

step2: 重新启动

    su elsearch
    /elasticsearch-6.3./bin/elasticsearch

    备注：切换 elsearch 用户
          重新启动

三、OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot a ...'(errno=12);
原因：jvm要分配最大内存超出系统内存
解决：

step1：适当调整指定jvm内存

vi /home/elasticsearch-6.3./config/jvm.options 

备注：编辑elasticsearch jvm配置文件 修改如下 esc+：wq保存退出

## JVM configuration

################################################################
## IMPORTANT: JVM heap size
################################################################
##
## You should always set the min and max JVM heap
## size to the same value. For example, to set
## the heap to  GB, set:
##
## -Xms4g
## -Xmx4g
##
## See https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html
## for more information
##
################################################################

# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space

-Xms512m
-Xmx512m

备注：由于虚拟机内存制定1g，所以适当降低jvm内存指定

step2:重启

su elsearch
/elasticsearch-6.3./bin/elasticsearch

四、ERROR: [3] bootstrap checks failed

详细错误：

[--20T02::,][INFO ][o.e.b.BootstrapChecks    ] [SUcoFrg] bound or publishing to a non-loopback address, enforcing bootstrap checks
ERROR: [] bootstrap checks failed
[]: max file descriptors [] for elasticsearch process is too low, increase to at least []
[]: max number of threads [] for user [elsearch] is too low, increase to at least []
[]: max virtual memory areas vm.max_map_count [] is too low, increase to at least []
[--20T02::,][INFO ][o.e.n.Node               ] [SUcoFrg] stopping ...
[--20T02::,][INFO ][o.e.n.Node               ] [SUcoFrg] stopped
[--20T02::,][INFO ][o.e.n.Node               ] [SUcoFrg] closing ...
[--20T02::,][INFO ][o.e.n.Node               ] [SUcoFrg] closed

原因：虚拟机限制用户的执行内存
解决：
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
[2]: max number of threads [3802] for user [elsearch] is too low, increase to at least [4096]

step1:修改安全限制配置文件

    su root
    vi /etc/security/limits.conf

    备注：使用最高权限 修改安全配置 在文件末尾加入

    # End of file
    elsearch       hard        nofile
    elsearch       soft        nofile
    *               soft       nproc
    *               hard       nproc
    备注： elsearch为用户名 可以是使用*进行通配
    nofile 最大打开文件数目
    nproc 最大打开线程数目

[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

step2:修改系统配置文件

vi /etc/sysctl.conf 

备注：行末加上vm.max_map_count = 655360 ，esc +：wq保存退出

# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf() and sysctl.d().
vm.max_map_count = 

备注：vm.max_map_count = 655360 值大于错误提示值

step3:重启

su elsearch
/elasticsearch-6.3./bin/elasticsearch

五、org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/home/elasticsearch-6.3.0/data/elasticsearch]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?

详细报错：

[--20T04::,][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/home/elasticsearch-6.3./data/elasticsearch]] with lock id []; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [])?
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:) ~[elasticsearch-cli-6.3..jar:6.3.]
    at org.elasticsearch.cli.Command.main(Command.java:) ~[elasticsearch-cli-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
Caused by: java.lang.IllegalStateException: failed to obtain node locks, tried [[/home/elasticsearch-6.3./data/elasticsearch]] with lock id []; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [])?
    at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.node.Node.<init>(Node.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.node.Node.<init>(Node.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Bootstrap$.<init>(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:) ~[elasticsearch-6.3..jar:6.3.]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) ~[elasticsearch-6.3..jar:6.3.]
    ...  more

原因：线程占用

解决：重新启动

step1:杀死elasticsearch线程

ps -ef | grep elastic

step2: 重启

su elsearch
/elasticsearch-6.3./bin/elasticsearch

原文：https://blog.csdn.net/qq_22211217/article/details/80740873