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增加 Samba Fails to Create The Folder. 

Signed-off-by: rick.chan <chenyang@autoai.com>
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rick.chan 2020-05-09 09:59:04 +08:00
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# Samba Fails to Create The Folder
## 问题描述
Samba 突然无法自动运行：
```sh
$ systemctl status smb
● smb.service - Samba SMB Daemon
Active: failed (Result: exit-code) since Mon 2019-03-18 10:05:14 EET; 40min ago
Mar 18 10:05:13 arch systemd[1]: Starting Samba SMB Daemon...
Mar 18 10:05:13 arch smbd[695]: mkdir failed on directory /run/samba/ncalrpc: No >
Mar 18 10:05:13 arch smbd[695]: Failed to create pipe directory /run/samba/ncalrp>
Mar 18 10:05:14 arch systemd[1]: smb.service: Main process exited, code=exited, status=>
Mar 18 10:05:14 arch systemd[1]: smb.service: Failed with result 'exit-code'.
Mar 18 10:05:14 arch systemd[1]: Failed to start Samba SMB Daemon.
```
ls /run 文件夹发现没有 /run/samba 目录，如果手动创建该文件夹则可以重新启动 Samba 服务，但是这样每次重启都需要手动运行 Samba 服务。
## 原因分析
/run/samba 文件夹是由 /usr/lib/tmpfiles.d/samba.conf 配置文件创建的：
```sh
$ journalctl -b | grep tmpfiles
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/lib/systemd.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/lib.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/log.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/cache.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/log.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/log.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var/log.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /var during canonicalization of /var.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /tmp during canonicalization of /tmp.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /tmp during canonicalization of /tmp.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /tmp during canonicalization of /tmp.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /tmp during canonicalization of /tmp.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /tmp during canonicalization of /tmp.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /run during canonicalization of /run.
May 09 09:05:32 HCenter systemd-tmpfiles[611]: Detected unsafe path transition / → /run during canonicalization of /run.
```
出现了大量的 unsafe path。
```sh
$ stat /
File: /
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: 802h/2050d Inode: 2 Links: 19
Access: (0775/drwxrwxr-x) Uid: (43655/ UNKNOWN) Gid: (43655/ UNKNOWN)
Access: 2019-12-21 22:28:31.809605109 +0800
Modify: 2020-04-27 11:23:32.869912052 +0800
Change: 2020-04-27 11:23:32.869912052 +0800
Birth: 2019-09-21 19:13:51.000000000 +0800
```
发现根目录的权限不对。
## 解决方案
```sh
sudo chown root:root /
sudo chmod 0755 /
ls /
```
如果根下还有权限不对的文件夹则一起修改了，结果如下：
```sh
$ stat /
File: /
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: 802h/2050d Inode: 2 Links: 19
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2019-12-21 22:28:31.809605109 +0800
Modify: 2020-04-27 11:23:32.869912052 +0800
Change: 2020-05-09 09:35:50.049985653 +0800
Birth: 2019-09-21 19:13:51.000000000 +0800
```
之后重启，Samba 服务恢复自动运行。
## 总结
再出现问题之前进行了一次系统升级，升级过程中出现了一些小问题。很可能是升级错误导致根目录权限发生了改变，根目录权限错误可能导致各种各样奇怪的问题。
## 参考
[samba fails to create the folder /var/run/samba](https://bbs.archlinux.org/viewtopic.php?id=245050)