Linux安装neo4j

Posted 2022-10-03 Circle-C

Linux/UNIX Install (tar)

  

1. Open up your terminal/shell.
2. Extract the contents of the archive, using:
   tar -xf <filecode>.
   For example,
   tar -xf neo4j-community-4.4.11-unix.tar.gz
3. Place the extracted files in a permanent home on your server. The top level directory is referred to as NEO4J_HOME.
   • To run Neo4j as a console application, use:
     <NEO4J_HOME>/bin/neo4j console
   • To run Neo4j in a background process, use:
     <NEO4J_HOME>/bin/neo4j start
   • For additional commands see the Unix tarball installation documentation.
4. Visit http://localhost:7474 in your web browser.
5. Connect using the username 'neo4j' with default password 'neo4j'. You'll then be prompted to change the password.

cd /usr/local/
wget https://dist.neo4j.org/neo4j-community-4.4.11-unix.tar.gz
tar -xf neo4j-community-4.4.11-unix.tar.gz

neo4j需要java环境，否则启动会报错：

Error: JAVA_HOME is not defined correctly.
  We cannot execute 

[root@iZwz97bu0gr8vw0924itpzZ neo4j-community-4.4.11]# cd bin/
[root@iZwz97bu0gr8vw0924itpzZ bin]# ll
total 92
-rwxr-xr-x 1 libstoragemgmt systemd-coredump  2213 Aug 29 15:30 cypher-shell
-rwxr-xr-x 1 libstoragemgmt systemd-coredump 37704 Aug 29 15:30 LICENSES.txt
-rwxr-xr-x 1 libstoragemgmt systemd-coredump 36006 Aug 29 15:30 LICENSE.txt
-rwxr-xr-x 1 libstoragemgmt systemd-coredump  3554 Aug 29 15:49 neo4j
-rwxr-xr-x 1 libstoragemgmt systemd-coredump  3565 Aug 29 15:49 neo4j-admin
-rwxr-xr-x 1 libstoragemgmt systemd-coredump  1959 Aug 29 15:30 NOTICE.txt
drwxr-xr-x 2 libstoragemgmt systemd-coredump    30 Aug 29 16:33 tools
[root@iZwz97bu0gr8vw0924itpzZ bin]# neo4j console
bash: neo4j: command not found
[root@iZwz97bu0gr8vw0924itpzZ bin]# ./neo4j console
which: no java in (/home/admin/.local/bin:/home/admin/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin)
Error: JAVA_HOME is not defined correctly.
  We cannot execute 

 需要java11版本

[root@iZwz97bu0gr8vw0924itpzZ bin]# ./neo4j console
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/neo4j/server/startup/Neo4jCommand has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)

 Java SE 版本和主要版本之间的映射：

Java SE	Major version
1.0.2	45
1.1	45
1.2	46
1.3	47
1.4	48
5.0	49
6	50
7	51
8	52
9	53
10	54
11	55
12	56
13	57
14	58
15	59
16	60

表格取自：https://docs.oracle.com/javase/specs/jvms/se16/html/jvms-4.html

安装java环境

1. 下载jdk11

https://www.oracle.com/java/technologies/downloads/#java11

 2. 创建java目录

mkdir /usr/local/java/

 3. 使用FTP工具（filezilla等），拷贝到/usr/local/java

tar -zxvf jdk-11.0.16.1_linux-x64_bin.tar.gz -C /usr/local/java/

 4. 配置环境变量

vi /etc/profile

在/etc/profile文件末尾添加 

export JAVA_HOME=/usr/local/java/jdk1.8.0_333
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH

使环境变量生效

source /etc/profile

2.完成安装后验证

java -version

配置并启用neo4j

配置

在安装目录下找到conf目录下的neo4j.conf文件

修改相应配置如下：

# 修改第22行load csv时l路径，在前面加个#，可从任意路径读取文件
#dbms.directories.import=import

# 修改35行和36行，设置JVM初始堆内存和JVM最大堆内存
# 生产环境给的JVM最大堆内存越大越好，但是要小于机器的物理内存
dbms.memory.heap.initial_size=5g
dbms.memory.heap.max_size=10g

# 修改46行，可以认为这个是缓存，如果机器配置高，这个越大越好
dbms.memory.pagecache.size=10g

# 修改54行，去掉改行的#，可以远程通过ip访问neo4j数据库
dbms.connectors.default_listen_address=0.0.0.0

# 默认 bolt端口是7687，http端口是7474，https关口是7473，不修改下面3项也可以
# 修改71行，去掉#，设置http端口为7687，端口可以自定义，只要不和其他端口冲突就行
#dbms.connector.bolt.listen_address=:7687

# 修改75行，去掉#，设置http端口为7474，端口可以自定义，只要不和其他端口冲突就行
dbms.connector.http.listen_address=:7474

# 修改79行，去掉#，设置http端口为7473，端口可以自定义，只要不和其他端口冲突就行
dbms.connector.https.listen_address=:7473

# 修改227行，去掉#，允许从远程url来load csv
dbms.security.allow_csv_import_from_file_urls=true

# 修改246行，允许使用neo4j-shell，类似于mysql 命令行之类的
dbms.shell.enabled=true

# 修改235行，去掉#，设置连接neo4j-shell的端口，一般都是localhost或者127.0.0.1，这样安全，其他地址的话，一般使用https就行
dbms.shell.host=127.0.0.1

# 修改250行，去掉#，设置neo4j-shell端口，端口可以自定义，只要不和其他端口冲突就行
dbms.shell.port=1337

# 修改254行，设置neo4j可读可写
dbms.read_only=false

启动 

进入bin目录执行
 后台启动：./neo4j start
 前台启动：./neo4j console
 查看状态：./neo4j status
 停止：./neo4j stop
 重启：./neo4j restart

客户端访问

http://服务器ip地址:7474/browser/