问题描述
我使用以下说明在 Ubuntu 12.04 上安装了 Neo4j:http://www.neo4j.org/download/linux
I installed Neo4j on Ubuntu 12.04 using these instructions: http://www.neo4j.org/download/linux
wget -O - http://debian.neo4j.org/neotechnology.gpg.key | apt-key add -
echo 'deb http://debian.neo4j.org/repo stable/' > /etc/apt/sources.list.d/neo4j.list
apt-get update
apt-get install neo4j
我确保拥有正确的 jdk:
I made sure to have the right jdk:
root@precise64:~# java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
当我启动 neo4j 时，出现此错误:
And when I startup neo4j I get this error:
警告:最多允许打开 1024 个文件，建议最少 40000 个.请参阅 Neo4j 手册.
所以我按照这里的说明操作:http://docs.neo4j.org/chunked/1.6.2/configuration-linux-notes.html
So I follow the instructions here: http://docs.neo4j.org/chunked/1.6.2/configuration-linux-notes.html
并将这些内容添加到/etc/security/limits.conf
neo4j soft nofile 40000
neo4j hard nofile 40000
并取消注释 /etc/pam.d/su
session required pam_limits.so
重启服务器后，我验证了新的限制
After I restart the server I validate the new limit
neo4j@precise64:~$ ulimit -n
40000
然后我重新启动我的服务器.启动时我仍然遇到同样的错误.
Then I restart my server. I still get the same error when starting up.
root@precise64:~# service neo4j-service start
WARNING: Max 1024 open files allowed, minimum of 40 000 recommended. See the Neo4j manual.
Using additional JVM arguments: -server -XX:+DisableExplicitGC -Dorg.neo4j.server.properties=conf/neo4j-server.properties -Djava.util.logging.config.file=conf/logging.properties -Dlog4j.configuration=file:conf/log4j.properties -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
Starting Neo4j Server...WARNING: not changing user
process [3161]... waiting for server to be ready....... OK.
http://localhost:7474/ is ready.
即使服务以 neo4j 用户身份运行:
Even though the service is running as the neo4j user:
root@precise64:~# ps -ef | grep 3161
neo4j 3161 1 2 17:43 pts/0 00:00:10 /usr/bin/java -cp /var/lib/neo4j/lib/concurrentlinkedhashmap-lru-1.3.1.jar:/var/lib/neo4j/lib/geronimo-jta_1.1_spec-1.1.1.jar:/var/lib/neo4j/lib/lucene-core-3.6.2.jar:/var/lib/neo4j/lib/neo4j-cypher-2.0.0.jar:/var/lib/neo4j/lib/neo4j-cypher-commons-2.0.0.jar:/var/lib/neo4j/lib/neo4j-cypher-compiler-1.9-2.0.0.jar:/var/lib/neo4j/lib/neo4j-cypher-compiler-2.0-2.0.0.jar:/var/lib/neo4j/lib/neo4j-graph-algo-2.0.0.jar:/var/lib/neo4j/lib/neo4j-graph-matching-2.0.0.jar:/var/lib/neo4j/lib/neo4j-jmx-2.0.0.jar:/var/lib/neo4j/lib/neo4j-kernel-2.0.0.jar:/var/lib/neo4j/lib/neo4j-lucene-index-2.0.0.jar:/var/lib/neo4j/lib/neo4j-shell-2.0.0.jar:/var/lib/neo4j/lib/neo4j-udc-2.0.0.jar:/var/lib/neo4j/lib/org.apache.servicemix.bundles.jline-0.9.94_1.jar:/var/lib/neo4j/lib/parboiled-core-1.1.6.jar:/var/lib/neo4j/lib/parboiled-scala_2.10-1.1.6.jar:/var/lib/neo4j/lib/scala-library-2.10.3.jar:/var/lib/neo4j/lib/server-api-2.0.0.jar:/var/lib/neo4j/system/lib/asm-3.1.jar:/var/lib/neo4j/system/lib/bcprov-jdk16-140.jar:/var/lib/neo4j/system/lib/commons-beanutils-1.8.0.jar:/var/lib/neo4j/system/lib/commons-beanutils-core-1.8.0.jar:/var/lib/neo4j/system/lib/commons-collections-3.2.1.jar:/var/lib/neo4j/system/lib/commons-compiler-2.6.1.jar:/var/lib/neo4j/system/lib/commons-configuration-1.6.jar:/var/lib/neo4j/system/lib/commons-digester-1.8.1.jar:/var/lib/neo4j/system/lib/commons-io-1.4.jar:/var/lib/neo4j/system/lib/commons-lang-2.4.jar:/var/lib/neo4j/system/lib/commons-logging-1.1.1.jar:/var/lib/neo4j/system/lib/jackson-core-asl-1.9.7.jar:/var/lib/neo4j/system/lib/jackson-jaxrs-1.9.7.jar:/var/lib/neo4j/system/lib/jackson-mapper-asl-1.9.7.jar:/var/lib/neo4j/system/lib/janino-2.6.1.jar:/var/lib/neo4j/system/lib/javax.servlet-3.0.0.v201112011016.jar:/var/lib/neo4j/system/lib/jcl-over-slf4j-1.6.1.jar:/var/lib/neo4j/system/lib/jersey-core-1.9.jar:/var/lib/neo4j/system/lib/jersey-multipart-1.9.jar:/var/lib/neo4j/system/lib/jersey-server-1.9.jar:/var/lib/neo4j/system/lib/jetty-http-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-io-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-security-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-server-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-servlet-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-util-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-webapp-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jetty-xml-9.0.5.v20130815.jar:/var/lib/neo4j/system/lib/jsr311-api-1.1.2.r612.jar:/var/lib/neo4j/system/lib/logback-access-1.0.9.jar:/var/lib/neo4j/system/lib/logback-classic-1.0.9.jar:/var/lib/neo4j/system/lib/logback-core-1.0.9.jar:/var/lib/neo4j/system/lib/mimepull-1.6.jar:/var/lib/neo4j/system/lib/neo4j-browser-2.0.0.jar:/var/lib/neo4j/system/lib/neo4j-server-2.0.0-static-web.jar:/var/lib/neo4j/system/lib/neo4j-server-2.0.0.jar:/var/lib/neo4j/system/lib/rhino-1.7R3.jar:/var/lib/neo4j/system/lib/rrd4j-2.0.7.jar:/var/lib/neo4j/system/lib/slf4j-api-1.6.2.jar:/var/lib/neo4j/conf/ -server -XX:+DisableExplicitGC -Dorg.neo4j.server.properties=conf/neo4j-server.properties -Djava.util.logging.config.file=conf/logging.properties -Dlog4j.configuration=file:conf/log4j.properties -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -Dneo4j.home=/var/lib/neo4j -Dneo4j.instance=/var/lib/neo4j -Dfile.encoding=UTF-8 org.neo4j.server.Bootstrapper
root 3238 2056 0 17:49 pts/0 00:00:00 grep --color=auto 3161
所以我认为可能以 root 身份启动服务是问题所在，所以我将其关闭并以 neo4j 用户身份启动.
So I think that maybe starting the service as root is the issue, so I shut it down and start it up as the neo4j user.
root@precise64:~# service neo4j-service stop
root@precise64:~# su - neo4j
neo4j@precise64:~$ service neo4j-service start
Using additional JVM arguments: -server -XX:+DisableExplicitGC - Dorg.neo4j.server.properties=conf/neo4j-server.properties -Djava.util.logging.config.file=conf/logging.properties -Dlog4j.configuration=file:conf/log4j.properties -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
Starting Neo4j Server...WARNING: not changing user
process [3435]... waiting for server to be ready....... OK.
http://localhost:7474/ is ready.
cp: cannot create regular file `/var/run/neo4j.pid': Permission denied
它失败了，因为无法创建pid文件.我认为这意味着这不是正确的方法，但我继续编辑 /etc/init.d/neo4j-service 将 pid 文件的位置更改为 neo4j 用户的主文件夹:
And it fails because the pid file cannot be created. Which I assume means this is not the correct approach, but I go ahead and edit /etc/init.d/neo4j-service to change the location of the pid file to the home folder of the neo4j user:
#PIDFILE=/var/run/$NAME.pid
PIDFILE=/var/lib/neo4j/$Name.pid
然后，当我以 Neo4j 用户身份运行该服务时，一切正常启动.
And then things startup without error when I run the service as the Neo4j user.
所以，我的问题是:预期的行为是什么?只要neo4j 用户具有正确的ulimit 权限，就应该以root 身份启动服务，还是我需要修改启动脚本/权限以允许neo4j 用户创建其PID 文件?
So, my question is: What is the intended behavior? Should starting the service as root work as long as the neo4j user has the correct ulimit permissions, or do I need to modify the startup script/permissions to allow the neo4j user to create it's PID file?
推荐答案
如本期评论中所述 并由 此提交 修复，自 Neo4J 3.1 起，
As mentioned in this issue comment and fixed by this commit, since Neo4J 3.1,
你可以在/etc/default/neo4j中添加一行:
NEO4J_ULIMIT_NOFILE=60000
为服务设置 ulimit 设置(60000 个打开文件).
to set the ulimit setting (60000 open files) for the service.
不再需要在 debian 上使用 /etc/security/limits.conf 来设置打开文件的数量.
There is no need anymore to use /etc/security/limits.conf on debian to set the number of open files.
这篇关于Neo4j 警告:最多允许打开 1024 个文件，建议最少 40 000 个.请参阅 Neo4j 手册的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！