错误
我在 CentOS 上安装了 Elasticsearch，rpm当我尝试通过以下方式启动它时遇到了这个错误systemctl start elasticsearch：
Feb 20 21:08:34 server.cberdata.org systemd[1]: Started Elasticsearch.
Feb 20 21:08:34 server.cberdata.org elasticsearch[4226]: OpenJDK 64-Bit Server VM warning: Cannot open file /var/log/elasticsearch/gc.log due to Permission denied
Feb 20 21:08:51 server.cberdata.org systemd[1]: elasticsearch.service: main process exited, code=exited, status=78/n/a
Feb 20 21:08:51 server.cberdata.org systemd[1]: Unit elasticsearch.service entered failed state.
Feb 20 21:08:51 server.cberdata.org systemd[1]: elasticsearch.service failed.
尤其： Cannot open file /var/log/elasticsearch/gc.log due to Permission denied
权限
权限/var：
drwxr-xr-x 21 root root 4096 Feb 11 19:10 var
权限/var/log：
drwxrwxr-- 12 root root 4096 Feb 20 21:00 log
权限/var/log/elasticsearch：
drwxrwxrwx 2 elasticsearch elasticsearch 4096 Feb 20 20:56 elasticsearch
权限/var/log/elasticsearch/gc.log
（我手动创建以查看是否有帮助，但这样做对错误没有影响）：
-rwxrwxrwx 1 elasticsearch elasticsearch 0 Feb 20 20:56 gc.log
将/var/log权限设置为drwxrwxrwx似乎可以解决问题，但我犹豫是否这样做，因为它似乎不安全并且会导致这些新错误：
/etc/cron.daily/logrotate:
error: skipping "/var/log/exim_mainlog" because parent directory has insecure permissions (It's world writable or writable by group which is not "root") Set "su" directive in config file to tell logrotate which user/group should be used for rotation.
我是否正确systemctl/systemd正在以用户身份运行此服务elasticsearch？如果这样做，文件及其目录的所有者，具有明显的读/写/执行权限，如何没有打开该文件的权限？
