ElasticSearch（7.15.1）启动遇到的问题

Linux环境

[root@CZ-QMRKJKXXPT-WW-WEB1 ~]# uname -a
Linux CZ-QMRKJKXXPT-WW-WEB1 2.6.32-642.el6.x86_64 #1 SMP Tue May 10 17:27:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@CZ-QMRKJKXXPT-WW-WEB1 ~]#  cat /proc/version
Linux version 2.6.32-642.el6.x86_64 (mockbuild@worker1.bsys.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC) ) #1 SMP Tue May 10 17:27:01 UTC 2016
[root@CZ-QMRKJKXXPT-WW-WEB1 ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m

1、如何指定ES使用项目自带jdk

#备份
cp elasticsearch-env elasticsearch-envcopy
#修改
vim elasticsearch-env 

将
# now set the path to java
if [ ! -z "$ES_JAVA_HOME" ]; then
  JAVA="$ES_JAVA_HOME/bin/java"
  JAVA_TYPE="ES_JAVA_HOME"
elif [ ! -z "$JAVA_HOME" ]; then
  # fallback to JAVA_HOME
  echo "warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME" >&2
  JAVA="$JAVA_HOME/bin/java"
  JAVA_TYPE="JAVA_HOME"
else
  # use the bundled JDK (default)
  if [ "$(uname -s)" = "Darwin" ]; then
    # macOS has a different structure
    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
  else
    JAVA="$ES_HOME/jdk/bin/java"
  fi
  JAVA_TYPE="bundled JDK"
fi

修改为


# now set the path to java
#if [ ! -z "$ES_JAVA_HOME" ]; then
#  JAVA="$ES_JAVA_HOME/bin/java"
#  JAVA_TYPE="ES_JAVA_HOME"
#elif [ ! -z "$JAVA_HOME" ]; then
  # fallback to JAVA_HOME
#  echo "warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME" >&2
#  JAVA="$JAVA_HOME/bin/java"
#  JAVA_TYPE="JAVA_HOME"
#else
  # use the bundled JDK (default)
  if [ "$(uname -s)" = "Darwin" ]; then
    # macOS has a different structure
    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
  else
    JAVA="$ES_HOME/jdk/bin/java"
  fi
  JAVA_TYPE="bundled JDK"
#fi

2、can not run elasticsearch as root

#创建用户：elasticsearch
adduser elasticsearch
# 创建用户密码，需要输入两次
passwd elasticsearch
#将对应的文件夹权限赋给该用户
chown -R elasticsearch elasticsearch-7.15.1

su elasticsearch

3、unable to install syscall filter

使用的是centos6，其linux内核版本为2.6。而Elasticsearch的插件要求至少3.5以上版本 。

修改confi

bootstrap.system_call_filter: false

4、exception during geoip databases update

此版本将GeoIp功能默认开启了采集。在默认的启动下是会去官网的默认地址下获取最新的Ip的GEO信息

在elasticsearch.yml中添加配置文章来源地址https://www.toymoban.com/news/detail-429338.html

ingest.geoip.downloader.enabled: false

5、 max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

vim /etc/security/limits.conf
#此处elasticsearch对应用户名
elasticsearch soft  nofile  65536
elasticsearch  hard  nofile  65536
elasticsearch  soft  nproc  4096
elasticsearch  hard  nproc  4096

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

vim /etc/sysctl.conf
#新增配置
vm.max_map_count=262144
重新加载/etc/sysctl.conf配置
sysctl -p

7、 Transport SSL must be enabled if security is enabled. Please set [xpack.security.transport.ssl.enabled] to [true] or disable security by setting [xpack.security.enabled] to [false]

#开启安全配置
xpack.security.enabled: false

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