启动Neo4j报错如下：
 
root@yumh:   neo4j restart
Neo4j not running
 Starting Neo4j.
 WARNING: Max 1024 open files allowed, minimum of 40000 recommended. See the Neo4j manual.
/usr/share/neo4j/bin/neo4j: 行 411: /var/run/neo4j/neo4j.pid: 没有那个文件或目录 
 
 
 
检查该目录，并没有：
root@yumh:  ll  /var/run/neo4j
 ls: 无法访问'/var/run/neo4j': 没有那个文件或目录 
 
解决：
手动创建该目录
 
root@yumh:   mkdir  /var/run/neo4j
 root@yumh:  neo4j start
 Active database: graph.db
 Directories in use:
   home:         /var/lib/neo4j
   config:       /etc/neo4j
   logs:         /var/log/neo4j
   plugins:      /var/lib/neo4j/plugins
   import:       /var/lib/neo4j/import
   data:         /home/raini/app/tmp/neo4j/data
   certificates: /var/lib/neo4j/certificates
   run:          /var/run/neo4j
 Starting Neo4j.
 WARNING: Max 1024 open files allowed, minimum of 40000 recommended. See the Neo4j manual.
 Started neo4j (pid 31427). It is available at http://localhost:7474/
 There may be a short delay until the server is ready.
 See /var/log/neo4j/neo4j.log for current status.