Neo4j安装 Linux：CentOS、openEuler 适配langchain应用RAG+知识图谱开发适配昇腾910B

Neo4j下载

进入Neo4j官网下载页面
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向下滑动找到 Graph Database Self-Managed
选择 社区版（COMMUNITY）
选择 Linux / Mac Executable Neo4j 5.17.0 (tar)
单机下载 Download

上传至服务器后进行解压

tar -axvf neo4j-community-5.17.0-unix.tar.gz

我在/root目录下解压会得到

/root/neo4j-community-5.17.0

配置conf文件

vim /root/neo4j-community-5.17.0//conf/neo4j.conf

输入 /default_listen_address找到目标需要修改的目标位置
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删除前面的注释符号保存即可

运行

/root/neo4j-community-5.17.0/bin/neo4j start

得到

which: no java in (/usr/local/Ascend/atb/latest/atb/bin:/usr/local/Ascend/nnae/latest/bin:/usr/local/Ascend/nnae/latest/compiler/ccec_compiler/bin:/usr/local/Ascend/ascend-toolkit/latest/bin:/usr/local/Ascend/ascend-toolkit/latest/compiler/ccec_compiler/bin:/root/anaconda3/bin:/root/anaconda3/condabin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
Error: JAVA_HOME is not defined correctly.
  We cannot execute

安装JAVA

进入JAVA17官网
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昇腾服务器下载第一个，其他服务器下载第二个
这里新建一个java文件夹，方便后续随时切换java版本

mkdir /root/java
cd /root/java
tar -zxvf jdk-17_linux-aarch64_bin.tar.gz

接下来配置环境变量，打开/etc/profile

vim /etc/profile

将以下内容添加到文件最后

#Java环境变量配置
export JAVA_HOME="/root/java/jdk-17.0.10"
export PATH="$JAVA_HOME/bin:$PATH"
export CLASSPATH=".:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar"

#neo4j环境变量配置
PATH="/root/neo4j-community-5.17.0/bin:$PATH"

然后按Esc，输入:wq保存

# 更新环境变量文件，使修改立即生效
source /etc/profile
# 查看jdk配置是否正确
java -version

得到以下内容即可

java version "17.0.10" 2024-01-16 LTS
Java(TM) SE Runtime Environment (build 17.0.10+11-LTS-240)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.10+11-LTS-240, mixed mode, sharing)

再次运行

这次配置了路径可以直接启动

neo4j start

得到

Directories in use:
home:         /root/neo4j-community-5.17.0
config:       /root/neo4j-community-5.17.0/conf
logs:         /root/neo4j-community-5.17.0/logs
plugins:      /root/neo4j-community-5.17.0/plugins
import:       /root/neo4j-community-5.17.0/import
data:         /root/neo4j-community-5.17.0/data
certificates: /root/neo4j-community-5.17.0/certificates
licenses:     /root/neo4j-community-5.17.0/licenses
run:          /root/neo4j-community-5.17.0/run
Starting Neo4j.
Started neo4j (pid:2159862). It is available at http://localhost:7474
There may be a short delay until the server is ready.