我今天升级到了 Ubuntu 16.04，我知道这是一次迟来的升级。升级完成后，ISC DHCP 服务器停止运行。
这似乎是一个权限问题，但我很难弄清楚。
我正在使用以下命令来测试/启动服务器：
sudo /usr/sbin/dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf
输出结果为
Internet Systems Consortium DHCP Server 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Config file: /etc/dhcp/dhcpd.conf
Database file: /var/lib/dhcp/dhcpd.leases
PID file: /run/dhcp-server/dhcpd.pid
Can't open lease database /var/lib/dhcp/dhcpd.leases: Permission denied --
check for failed database rewrite attempt!
Please read the dhcpd.leases manual page if you
don't know what to do about this.
<snip>
有人会认为这只是改变租赁文件的所有权/权限的问题，以下是现有的权限：
mike@wilma:~$ sudo ls -lad /var/lib/dhcp/ /var/lib/dhcp/*
drw-rw-r-- 2 dhcpd dhcpd 4096 Jul 3 23:02 /var/lib/dhcp/
-rw-r--r-- 1 dhcpd dhcpd 0 Aug 4 2016 /var/lib/dhcp/dhclient.leases
-rw-rw-r-- 1 dhcpd dhcpd 842233 Jul 3 11:55 /var/lib/dhcp/dhcpd.leases
确保用户确实存在...
@wilma:~$ id dhcpd
uid=112(dhcpd) gid=123(dhcpd) groups=123(dhcpd)
我现在已经关闭了 apparmor，所以这不是问题。
任何帮助将不胜感激。
使用 systemctl ....
mike@wilma:~$ sudo systemctl restart isc-dhcp-server.service
[sudo] password for mike:
Sorry, try again.
[sudo] password for mike:
日志文件的结果
Jul 3 23:50:12 wilma systemd[1]: Stopped ISC DHCP IPv4 server.
Jul 3 23:50:12 wilma systemd[1]: Started ISC DHCP IPv4 server.
/usr/share/man/man8/dhcpd.8.gz
Jul 3 23:50:12 wilma dhcpd[26877]: Internet Systems Consortium DHCP Server 4.3.3
Jul 3 23:50:12 wilma sh[26877]: Internet Systems Consortium DHCP Server 4.3.3
Jul 3 23:50:12 wilma sh[26877]: Copyright 2004-2015 Internet Systems Consortium.
Jul 3 23:50:12 wilma sh[26877]: All rights reserved.
Jul 3 23:50:12 wilma sh[26877]: For info, please visit https://www.isc.org/software/dhcp/
Jul 3 23:50:12 wilma dhcpd[26877]: Copyright 2004-2015 Internet Systems Consortium.
Jul 3 23:50:12 wilma dhcpd[26877]: All rights reserved.
Jul 3 23:50:12 wilma dhcpd[26877]: For info, please visit https://www.isc.org/software/dhcp/
Jul 3 23:50:12 wilma dhcpd[26877]: Config file: /etc/dhcp/dhcpd.conf
Jul 3 23:50:12 wilma sh[26877]: Config file: /etc/dhcp/dhcpd.conf
Jul 3 23:50:12 wilma sh[26877]: Database file: /var/lib/dhcp/dhcpd.leases
Jul 3 23:50:12 wilma sh[26877]: PID file: /run/dhcp-server/dhcpd.pid
Jul 3 23:50:12 wilma dhcpd[26877]: Database file: /var/lib/dhcp/dhcpd.leases
Jul 3 23:50:12 wilma dhcpd[26877]: PID file: /run/dhcp-server/dhcpd.pid
Jul 3 23:50:12 wilma dhcpd[26877]: Internet Systems Consortium DHCP Server 4.3.3
Jul 3 23:50:12 wilma dhcpd[26877]: Copyright 2004-2015 Internet Systems Consortium.
Jul 3 23:50:12 wilma dhcpd[26877]: All rights reserved.
Jul 3 23:50:12 wilma dhcpd[26877]: For info, please visit https://www.isc.org/software/dhcp/
Jul 3 23:50:12 wilma dhcpd[26877]: Can't chown new lease file: Operation not permitted
Jul 3 23:50:12 wilma dhcpd[26877]:
Jul 3 23:50:12 wilma sh[26877]: Can't chown new lease file: Operation not permitted
文件的权限由 systemctl 脚本更改：
mike@wilma:~$ sudo ls -lad /var/lib/dhcp/ /var/lib/dhcp/*
drwxrwxr-x 2 root dhcpd 4096 Jul 3 23:50 /var/lib/dhcp/
-rw-r--r-- 1 dhcpd dhcpd 0 Aug 4 2016 /var/lib/dhcp/dhclient.leases
-rw-rw-r-- 1 root dhcpd 842233 Jul 3 11:55 /var/lib/dhcp/dhcpd.leases
-rw-r--r-- 1 root root 0 Jul 3 23:50 /var/lib/dhcp/dhcpd.leases.1562154612
答案1
这可能是您在 4.3.3 中遇到的一个已知错误：
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1186662
升级 ISC 可能是最简单的。
答案2
我想感谢大家花时间和精力来帮助我。问题不知怎么就解决了，恐怕我无法给出原因，它只是重新开始工作了。系统日志显示租约没有问题。
再次感谢:)