ElasticSearch：ElasticSearch.Service的作业失败

Question

我目前正在尝试为一个项目设置Elasticsearch。我已经安装了ElasticSearch 7.4.1，还安装了Java，即OpenJDK 11.0.4。

但是当我尝试使用以下命令启动Elasticsearch时

sudo systemctl start elasticsearch

我得到以下错误

systemctl status elasticsearch.service

loaded：loaded（/usr/lib/systemd/system/elasticsearch.service；disabled；vend

活动：自世界协调时2019-11-01 06:09:54开始失败（结果：退出-代码）；12年前

Docs: http://www.elastic.co

进程:5960 execstart=/usr/share/elasticsearch/bin/elasticsearch-p${PID_DI

我需要一些帮助。提前谢了。

Answer 1

我是这样解决的

首先，使用以下命令在nano编辑器中打开/etc/elasticsearch/elasticsearch.yml:

sudo nano /etc/elasticsearch/elasticsearch.yml

您的网络设置应为：

# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 127.0.0.1
#
# Set a custom port for HTTP:
#
http.port: 9200

journalctl -xe

解决方案

作为一个JVM应用程序，Elasticsearch主服务器进程仅利用专用于JVM的内存。所需内存可能取决于所使用的JVM（32位或64位）。JVM使用的内存通常包括：

• 堆空间（通过-xms和-xmx配置）
• 元程序（受可用本机内存量限制）
• 内部JVM（通常为数十Mb)
• 依赖操作系统的内存特性，如内存映射文件。

sudo nano /etc/elasticsearch/jvm.options

最低要求：如果物理RAM<=1 GB

然后，您的设置应该是：

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

-Xms128m
-Xmx128m

或

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

-Xms256m
-Xmx256m

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

-Xms512m
-Xmx512m

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

-Xms750m
-Xmx750m

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

-Xms1024m
-Xmx1024m

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

-Xms2048m
-Xmx2048m

注意：如果物理RAM>=8 GB，您可以决定要为ElasticSearch分配多少堆空间。您可以根据可用资源分配-xms2048m和-xmx2048m或-xms4g和-xmx4g，甚至更高，以获得更好的性能。

错误2

初始堆大小不等于最大堆大小

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

-Xms128m
-Xmx256m

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

-Xms128m
-Xmx128m

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

-Xms256m
-Xmx256m

错误3

默认的发现设置不适合生产使用；必须至少配置[discovery.seed_hosts,discovery.seed_providers,cluster.initial_master_nodes]之一

解决方案

sudo nano /etc/elasticsearch/elasticsearch.yml

# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.seed_hosts: []

sudo systemctl start elasticsearch
sudo systemctl status elasticsearch