Samba 不會以 systemd 啟動

我在 centos 8 上從原始碼安裝 samba 4.12.6。

當我直接啟動 samba

/usr/local/samba/sbin/samba

它按預期執行。

現在我創建一個 systemd 單元：

[Unit]
Description=Samba Active Directory Domain Controller
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/samba/sbin/samba -D
PIDFile=/usr/local/samba/var/run/samba.pid
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=default.target

啟動它，它失敗，權限被拒絕

[root@centos-server-01 ~]# systemctl status samba-ad.service
● samba-ad.service - Samba Active Directory Domain Controller
  Loaded: loaded (/etc/systemd/system/samba-ad.service; disabled; vendor preset: disabled)
  Active: failed (Result: exit-code) since Fri 2020-09-04 19:03:24 CEST; 14s ago
 Process: 1549 ExecStart=/usr/local/samba/sbin/samba -D (code=exited, status=203/EXEC)

Sep 04 19:03:24 centos-server-01 systemd[1]: Starting Samba Active Directory Domain Controller...
Sep 04 19:03:24 centos-server-01 systemd[1]: samba-ad.service: Control process exited, code=exited status=203
Sep 04 19:03:24 centos-server-01 systemd[1]: samba-ad.service: Failed with result 'exit-code'.
Sep 04 19:03:24 centos-server-01 systemd[1]: Failed to start Samba Active Directory Domain Controller.

journalctl顯示：

journalctl _PID=1549
-- Logs begin at Fri 2020-09-04 18:00:19 CEST, end at Fri 2020-09-04 19:03:39 CEST. --
Sep 04 19:03:24 centos-server-01 systemd[1549]: samba-ad.service: Failed to execute command: Permission denied
Sep 04 19:03:24 centos-server-01 systemd[1549]: samba-ad.service: Failed at step EXEC spawning /usr/local/samba/sbin/samba: Permission denied

samba 二進製文件是可執行的：

ls -al /usr/local/samba/sbin/
total 2816
-rwxr-xr-x.  1 root root  771608 Sep  2 17:28 eventlogadm
-rwxr-xr-x.  1 root root  331304 Sep  2 17:28 nmbd
-rwxr-xr-x.  1 root root   58280 Sep  2 17:27 samba
-rwxr-xr-x.  1 root root    3616 Sep  1 20:15 samba-gpupdate
.
.

file顯示：

/usr/local/samba/sbin/samba: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically li    nked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=3f9ee20e102f467fc    12e1b4bc913472f23dcde0b, not stripped

我總是以 root 身份登錄。我閱讀了在執行生成步驟中失敗…權限被拒絕和以下內容，但它沒有幫助。

也許有人對我有線索

SELinux 將可在 ExecStart 中使用的二進製文件限制為具有system_u:object_r:bin_t:s0屬性集的路徑。通常這些是/usr/bin /usr/sbin /usr/libexec /usr/local/bin目錄。您需要將 samba 二進製文件移動到此目錄之一或更改 selinux 策略以允許 systemd 使用 /usr/local/samba/sbin/ 中的二進製文件：

chcon -R -t bin_t /usr/local/samba/sbin/

引用自：https://serverfault.com/questions/1032710