我的 afs 客户端停止工作。我不知道为什么——也许我跑了apt-get
？无论如何：
user@box ~ $ kinit
[email protected]'s Password:
user@box ~ $ aklog
aklog: a pioctl failed while obtaining tokens for cell ies.auc.dk
检查服务状态：
user@box ~ $ sudo service openafs-client status
[sudo] password for user:
● openafs-client.service - OpenAFS client
Loaded: loaded (/lib/systemd/system/openafs-client.service; enabled; vendor p
Active: active (exited) since Mon 2017-11-13 08:17:40 CET; 3h 8min ago
Process: 1942 ExecStartPost=/usr/bin/fs sysname $AFS_SYSNAME (code=exited, sta
Process: 1934 ExecStartPost=/usr/bin/fs setcrypt $AFS_SETCRYPT (code=exited, s
Process: 1930 ExecStart=/sbin/afsd $AFSD_ARGS (code=exited, status=0/SUCCESS)
Process: 1918 ExecStartPre=/usr/share/openafs/openafs-client-precheck (code=ex
Tasks: 0 (limit: 512)
Memory: 0B
CPU: 0
Nov 13 08:17:40 box systemd[1]: Starting OpenAFS client...
Nov 13 08:17:40 box openafs-client-precheck[1918]: modprobe: FATAL: Modul
Nov 13 08:17:40 box openafs-client-precheck[1918]: Failed to load openafs
Nov 13 08:17:40 box fs[1934]: Usage: /usr/bin/fs setcrypt -crypt <on or o
Nov 13 08:17:40 box fs[1942]: Usage: /usr/bin/fs sysname [-newsys <new sy
Nov 13 08:17:40 box systemd[1]: Started OpenAFS client.
Modprobe 失败。直觉认为这是 dkms 的东西，它应该构建内核模块。尝试触发内核模块的构建（应该作为安装的一部分发生）：
user@box ~ $ sudo dpkg-reconfigure openafs-modules-dkms
-------- Uninstall Beginning --------
Module: openafs
Version: 1.6.21
Kernel: 4.4.0-21-generic (x86_64)
-------------------------------------
Status: Before uninstall, this module version was ACTIVE on this kernel.
openafs.ko:
- Uninstallation
- Deleting from: /lib/modules/4.4.0-21-generic/updates/dkms//
- Original module
- No original module was found for this module on this kernel.
- Use the dkms install command to reinstall any previous module version.
depmod.....
DKMS: uninstall completed.
------------------------------
Deleting module version: 1.6.21
completely from the DKMS tree.
------------------------------
Done.
Loading new openafs-1.6.21 DKMS files...
Building only for 4.4.0-97-generic
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
内核版本之间不匹配； 4.4.0-21 已安装。 4.4.0-97 是当前版本。由于源不可用，无法构建当前版本。
答案1
为当前内核安装相关头文件：
user@box ~ $ sudo apt-get install linux-headers-`uname -r`
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
linux-headers-4.4.0-97-generic
0 upgraded, 1 newly installed, 0 to remove and 14 not upgraded.
Need to get 817 kB of archives.
After this operation, 7,427 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 linux-headers-4.4.0-97-generic amd64 4.4.0-97.120 [817 kB]
Fetched 817 kB in 0s (1,626 kB/s)
Selecting previously unselected package linux-headers-4.4.0-97-generic.
(Reading database ... 301414 files and directories currently installed.)
Preparing to unpack .../linux-headers-4.4.0-97-generic_4.4.0-97.120_amd64.deb ...
Unpacking linux-headers-4.4.0-97-generic (4.4.0-97.120) ...
Setting up linux-headers-4.4.0-97-generic (4.4.0-97.120) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 4.4.0-97-generic /boot/vmlinuz-4.4.0-97-generic
触发 afs 内核模块的 dkms 构建：
user@box ~ $ sudo dpkg-reconfigure openafs-modules-dkms
-------- Uninstall Beginning --------
Module: openafs
Version: 1.6.21
Kernel: 4.4.0-97-generic (x86_64)
-------------------------------------
Status: Before uninstall, this module version was ACTIVE on this kernel.
openafs.ko:
- Uninstallation
- Deleting from: /lib/modules/4.4.0-97-generic/updates/dkms//
- Original module
- No original module was found for this module on this kernel.
- Use the dkms install command to reinstall any previous module version.
depmod....
DKMS: uninstall completed.
------------------------------
Deleting module version: 1.6.21
completely from the DKMS tree.
------------------------------
Done.
Loading new openafs-1.6.21 DKMS files...
Building only for 4.4.0-97-generic
Building initial module for 4.4.0-97-generic
Done.
openafs:
Running module version sanity check.
- Original module
- No original module exists within this kernel
- Installation
- Installing to /lib/modules/4.4.0-97-generic/updates/dkms//
depmod....
DKMS: install completed.
重启afs客户端，插入内核模块：
user@box ~ $ sudo service openafs-client restart
解决了：
user@box ~ $ kinit
[email protected]'s Password:
user@box ~ $ aklog
user@box ~ $ klist
Credentials cache: FILE:/tmp/krb5cc_1000
Principal: [email protected]
Issued Expires Principal
Nov 13 13:02:45 2017 Nov 13 23:02:42 2017 krbtgt/[email protected]
Nov 13 13:02:46 2017 Nov 13 23:02:42 2017 afs/[email protected]