天气：晴 风力：微风

systemctl 补充

• Type=forking 命令启动后放到后台，默认启动后退出

• 需要java环境的话应添加 Environment=JAVA_HOME=/usr/local/bin/jdk1.8.0_171

• 修改xxx.service 后 执行systemctl daemon-reload重新载入

• systemctl enable xxx加入开机启动，实际Created symlink from /etc/systemd/system/multi-user.target.wants/neo4j.service to /usr/lib/systemd/system/neo4j.service.
  复制了一个软连接到多用户启动服务下面

• systemctl status xxx查看当前状态

• systemctl start xxx 和systemctl start xxx.service一样

• systemctl start xxx起来的最好使用systemctl stop xxx关，bin/stop可能会出问题，例如stop不会退出

修改可同时读文件数量

1. Become root, since all operations that follow require editing protected system files.

user@localhost:~sudo su - Password: root@localhost:~

2. Edit /etc/security/limits.conf and add these two lines:

neo4j soft nofile 40000
neo4j hard nofile 40000

3. Edit /etc/pam.d/su and uncomment or add the following line:

session required pam_limits.so

4. . A restart is required for the settings to take effect.