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howto:systemd [2016/11/21 09:52] – created ragnarokhowto:systemd [2021/01/01 13:44] – [Ubuntu 16.04+] Retros tip from IRC digital man
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-====== Start Synchornet BBS from Systemd ======+====== Start Synchronet BBS from Systemd ======
  
-If you run modern GNU/Linux distribution, you can found systemd as init system (Debian, Fedora and others).+If you run modern GNU/Linux distribution, you will likely discover [[https://en.wikipedia.org/wiki/Systemd|Systemd]] is used as the init system (for starting and control system services/daemons).
  
-Instead of use the old /etc/init.d/sbbs.service init script, you can create a systemd services unit file:+In this case, instead of use the old SysV-style /etc/init.d/sbbs.service init script, you use a systemd services unit file:
  
-Debian:+Create and edit (or download from [[http://cvs.synchro.net/cgi-bin/viewcvs.cgi/*checkout*/install/systemd/sbbs.service|here]]) the following file (please correct your ExecStart path and User/Group as you need):
  
-Create and edit the follow file: +===== Ubuntu 16.04+ ===== 
 +''/lib/systemd/system/sbbs.service'' 
 +<file
 +[Unit] 
 +  Description=Synchronet BBS service 
 +  Documentation=man:sbbs 
 +  After=syslog.target network.target 
 +   
 +[Service] 
 +  Type=forking 
 +  Environment=SBBSROOT=/sbbs SBBSCTRL=/sbbs/ctrl 
 +  User=sbbs 
 +  Group=sbbs 
 +  PermissionsStartOnly=true 
 +  ExecStart=/sbbs/exec/sbbs d 
 +  ExecReload=/bin/kill -HUP $MAINPID 
 +  Restart=on-failure 
 +  RestartSec=30 
 +   
 +[Install] 
 +  WantedBy=multi-user.target 
 +</file>
  
-/etc/systemd/system/sbbs.service +Some points in this config: 
 +   * **After**. If you are using syslog with sbbs, so it is nice to put that requirement before systemd tries to launch sbbs. 
 +   * **Type**. If you are to run SBBS in daemonized mode, the main executable will exit after the daemon is called. This could confuse systemd into thinking the process is finished. If you use "Type=forking" you tell systemd that the process you launch will execute another process. 
 +   * **Environment**. In order to avoid having multiple files, you can embed the variables inside the service file. 
 +   * **User/Group**. **Remove these** if you would like sbbs to start as root and then drop privileges to the User & Group configured in your sbbs.ini. Possibly remove **PermissionsStartOnly** and **ExecStartPre** as well, as they would be unnecessary.   If you leave these in, ensure the User/Group settings in sbbs.ini are commented out. 
 +   * **PermissionsStartOnly**. This one tells systemd to execute ExecStartPre as root, but ExecStart as the user and group declared in User,Group.  Can be removed if you remove the User/Group lines. 
 +   * **ExecStart**. If you don't want to get syslog entries duplicated you will have to run SBBS in daemonized mode, so the "d" parameter is used. Syslog is implicit when daemonized, so there is no need for additional parameters.  
 +   * **RestartSec**. It's advisable to wait some secs before attempting restarting in case of failure, just to give some time for binding release.
  
 +Installation instructions:
 +  -Modify the environment variables to match your SBBS setup
 +  -Modify User and Group. If you run this as root you don't need the ExecStartPre line.
 +  -Modify the ExecStart and ExecStartPre paths to match your Synchronet setup.
 +  -Place this file in the correct location. For Ubuntu 16.04 you should place it in /lib/systemd/system
 +  -Enable the service with "systemctl enable sbbs"
 +  -To run the service without restarting "systemctl start sbbs"
 +
 +Running //systemctl status sbbs// will show:
 +
 +  ● sbbs.service - Synchronet BBS service
 +    Loaded: loaded (/lib/systemd/system/sbbs.service; enabled; vendor preset: enabled)
 +    Active: active (running) since Thu 2016-12-15 20:20:43 CET; 16s ago
 +      Docs: man:sbbs
 +   Process: 12364 ExecStart=/sbbs/exec/sbbs d (code=exited, status=0/SUCCESS)
 +  Main PID: 12374 (sbbs)
 +     Tasks: 11
 +    Memory: 30.1M
 +       CPU: 223ms
 +    CGroup: /system.slice/sbbs.service
 +            └─12374 /sbbs/exec/sbbs d
 +  
 +  Dec 15 20:23:25 HISPAMSX sbbs[1226]: term Node 1 Telnet  ------- [----------]
 +  Dec 15 20:23:31 HISPAMSX sbbs[1226]: term Node 1 Terminal not detected, reducing inactivity hang-up timeout to 75 seconds
 +  Dec 15 20:23:36 HISPAMSX sbbs[1226]: term Node 1 Unknown User 'Enable'
 +  Dec 15 20:24:02 HISPAMSX sbbs[1226]: term Node 1 disconnected
 +  Dec 11 20:24:03 HISPAMSX sbbs[1226]: term Node 1 thread terminated (0 node threads remain, 71 clients served)
 +
 +**NOTE**:\\
 +If you're running any kind of recent (last 2yrs+) systemd, to avoid the use of ''[[howto:linux_non-root|setcap]]'' to run 'sbbs' as a non-root user, just put this line in the ''[Service]'' section of your ''sbbs.service'' file:  ''**AmbientCapabilities=CAP_NET_BIND_SERVICE**''
 +===== Monitoring with Byobu (Tmux backend) =====
 +You can have a text mode dashboard for monitoring and configuring your BBS realtime by using Byobu with Tmux or GNU Screen backends. If you are using the Tmux backend. The following configuration splits your screen in three panes: one for SBBS log, other for UMONITOR and a last one for SCFG. Please note that this configuration assumes SBBSCTRL variable is set and that access permissions to the needed files are set for the current user.
 +
 +Create the file ''$BYOBU_CONFIG_DIR/windows.tmux.sbbs'' with the following contents:
 +
 +  new-session sbbs ;
 +  new-window -n sbbs tail -n 50 -f /var/log/sbbs.log ;
 +  split-window -h /sbbs/exec/umonitor ;
 +  split-window -t 1 -v /sbbs/exec/scfg ;
 +  set-option mouse on
 +
 +And then run: ''user@localhost:~$ BYOBU_WINDOWS=sbbs byobu''
 +
 +If you want this to be your default environment when you log at your Synchronet server, then write the configuration to the ''$BYOBU_CONFIG_DIR/windows.tmux'' file instead of ''$BYOBU_CONFIG_DIR/windows.tmux.sbbs''
 +
 +The following screenshot shows the result:
 +
 +{{:monitor:sbbs_monitor_byobu.png?200|}}
 +
 +If are using also **binkd** for FidoNet, this configuration will split the dashboard in 4 panes:
 +
 +  new-session sbbs ;
 +  new-window -n sbbs tail -n 50 -f /var/log/sbbs.log ;
 +  split-window -p 50 -h /sbbs/exec/umonitor ;
 +  split-window -t 0 -p 20 -v tail -f /var/log/binkd.log ;
 +  split-window -t 1 -v /sbbs/exec/scfg ;
 +  set-option mouse on
 +
 +{{:monitor:sbbs_monitor_byobu_4pane.png?200|}}
 +===== Debian & CentOS 7 ===== 
 +
 +/etc/default/sbbs
 +  SBBSCTRL=/sbbs/ctrl
 +
 +/etc/systemd/system/sbbs.service 
   [Unit]   [Unit]
   Description=Synchronet BBS   Description=Synchronet BBS
   Documentation=man:sbbs   Documentation=man:sbbs
   After=network.target   After=network.target
 +  
   [Service]   [Service]
   Restart=on-failure   Restart=on-failure
Line 21: Line 114:
   ExecStart=/sbbs/exec/sbbs nd   ExecStart=/sbbs/exec/sbbs nd
   ExecReload=/bin/kill -HUP $MAINPID   ExecReload=/bin/kill -HUP $MAINPID
- 
   User=root   User=root
   Group=root   Group=root
 +  
 +  [Install]
 +  WantedBy=multi-user.target
  
 +
 +Finally, you must execute //systemd daemon-reload// for tell systemd te reload the unit file
 +
 +Test your setup:
 +
 +  # systemctl status sbbs
 +  ● sbbs.service - Synchronet BBS
 +     Loaded: loaded (/etc/systemd/system/sbbs.service; enabled)
 +     Active: active (running) since lun 2016-11-21 14:39:53 ART; 24min ago
 +       Docs: man:sbbs
 +    Process: 14393 ExecStart=/sbbs/exec/sbbs nd (code=exited, status=0/SUCCESS)
 +   Main PID: 14393 (sbbs)
 +     CGroup: /system.slice/sbbs.service
 +             └─14393 /sbbs/exec/sbbs nd
 +  
 +  nov 21 14:39:53 scarlet systemd[1]: Started Synchronet BBS.
 +
 +
 +===== Debian (alternative using tmux) =====
 +
 +You can use [[https://en.wikipedia.org/wiki/Tmux|Tmux]] to still the Synchronet BBS console running on a screen that can be attached when you need
 +
 +/etc/default/sbbs
 +  SBBSCTRL=/sbbs/ctrl
 +
 +/etc/systemd/system/sbbs.service 
 +  [Unit]
 +  Description=Synchronet BBS
 +  Documentation=man:sbbs
 +  After=network.target
 +  
 +  [Service]
 +  Restart=on-failure
 +  Type=forking
 +  KillMode=none
 +  EnvironmentFile=-/etc/default/sbbs
 +  
 +  ExecStart=/usr/bin/tmux new-session -d -s sbbs '/sbbs/exec/sbbs nd'
 +  ExecStop=/usr/bin/tmux send-keys -t sbbs 'q' C-m 'exit' C-m
 +  
 +  User=root
 +  Group=root
 +  
   [Install]   [Install]
   WantedBy=multi-user.target   WantedBy=multi-user.target
  
 +Using tmux, Synchronet start in a session (called sbbs), you can attach to the running console using //tmux attach -t sbbs//
  
 +{{:howto:sbbs_tmux.png?200|}}
 +
 +===== Recommended Tweaks to the Service Section ===
 +Add these to the ''[Service]'' section:
 +
 +To increase the open file limit:
 +  LimitNOFILE=10000
 +
 +To allow core file generation (for crash/segfault debugging:
 +  LimitCORE=infinity
  
 ===== See Also ===== ===== See Also =====
   * [[:howto:|howto index]]   * [[:howto:|howto index]]
- +  * [[https://synchronetbbs.org/index.php/downloads]] - Alternate startup script that uses "screen" rather than tmux and restarts the server if it should crash. 
-{{tag>}}+{{tag>linux systemd}}
  
howto/systemd.txt · Last modified: 2022/11/30 22:00 by digital man
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