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First, I am connecting to a Red Hat machine which is identified from the following:

cat /proc/version
Linux version 4.2.2-1.el7.elrepo.x86_64 (mockbuild@Build64R7) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Wed Sep 30 15:08:55 EDT 2015

I had modified the /etc/samba/smb.conf to include the directory which I want to share. In the past I would issue the following to restart the service

sudo service smbd restart

But I receive the following message

Redirecting to /bin/systemctl restart smbd.service
Failed to restart smbd.service: Unit not found.

In the past I might had looked in /etc/rc.d/init.d/ for the service, but it doesn't show the smbd service there. I know the service is running by the following:

netstat -plnt | grep smbd
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      1753/smbd           
tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN      1753/smbd           
tcp6       0      0 :::139                  :::*                    LISTEN      1753/smbd           
tcp6       0      0 :::445                  :::*                    LISTEN      1753/smbd   

From one of the outputs of the command I saw systemd was being used, so following some instructions from a site I tried the following (and it failed):

systemctl stop smbd.service      
Failed to stop smbd.service: Unit smbd.service not loaded.

So, now I am at a lost and my search fu has yield nothing to help me find where these services are located and how to query their status, stop/start/restart them.

  • You can run the following command to get a list of all loaded, active, services systemd manages: systemctl --state=active --type=service list-units – jdwolf Nov 15 '17 at 3:38
  • This is probably because smbd is masked. What is the status? systemctl status smbd.service – jdwolf Nov 15 '17 at 3:40
  • Thanks, @jdwolf, using your command to list the loaded and active service I did find out the service name is smb.service. Thanks! – lordhog Nov 15 '17 at 21:17
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You are using the wrong name.

What the Debian world knows as samba-ad-dc.service is called samba.service in the rest of the world outwith Debian. Similarly, nmbd.service and smbd.service are originally nmb.service and smb.service outwith Debian.

Further reading

  • Using @jdwolf suggestion of querying the services I did find the service name is smb.service and was able to issue the command systemctl restart smb.service which seemed to execute without issue. – lordhog Nov 15 '17 at 21:16
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You may try common process check:

# ps auxf | grep -2 smb

And from $PATH:

# whereis smb # or 
# whereis smbd

# systemctl restart sbm may work.

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