Bug 737725

Created attachment 522831 [details]
telnet socket

Created attachment 522832 [details]
telnet service

Once package and shipped your package should no longer have to depend on xinetd

https://fedoraproject.org/wiki/Packaging:Guidelines:Systemd
https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd

Johann, I couldn't get this working in my tests. Can you try?

Hum what release are you on as in there is a bug in systemd .35 that might be causing this

[root@localhost system]# systemctl start telnet.socket
[root@localhost system]# systemctl status telnet.socket
telnet.socket - Telnet Server Activation Socket
	  Loaded: loaded (/lib/systemd/system/telnet.socket; disabled)
	  Active: active (listening) since Sun, 25 Sep 2011 11:05:49 +0000; 1min 56s ago
	Accepted: 1; Connected: 0
	  CGroup: name=systemd:/system/telnet.socket
[root@localhost system]# netstat -pant | grep 23 | grep LISTEN
tcp        0      0 :::23                       :::*                        LISTEN      1/systemd           
[root@localhost system]# telnet localhost 23
Trying ::1...
Connected to localhost.
Escape character is '^]'.
Fedora release 16 (Verne)
Kernel 3.1.0-0.rc6.git0.0.fc16.x86_64 on an x86_64 (1)
login: johann
Password: 
Last login: Sun Sep  4 20:35:13 on tty4
[johann@localhost ~]$ rpm -q systemd
systemd-36-2.fc16.x86_64

systemd-35-1.fc16.x86_64 ... so yeah, looks like I'm on the buggy one. Will retest after upgrading.

When I try this, with systemd-36-3.fc16.x86_64, the socket starts, but as soon as I telnet to it, it dies:

[root@pterodactyl ~]# systemctl start telnet.socket
[root@pterodactyl ~]# telnet localhost
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.
[root@pterodactyl ~]#

Looking in syslog, I see:

Sep 26 10:04:27 pterodactyl systemd[1]: telnet.socket failed to queue socket startup job: Invalid argument
Sep 26 10:04:27 pterodactyl systemd[1]: Unit telnet.socket entered failed state.

This did work just fine with pre .35 and works fine with .36-2 so something that got changed in 36-3 broke it ( Downgrade to 36-2 to confirm and whatever got changed probably is breaking some other  units as well ) so file a bug against systemd. 

And note I'm going on a natural hot spring/pool hunting here on top of the world for the whole week which means I will be on limited internet connectivity during that time.

I suppose this should be telnetd, right? Anyway, an important thing that is not obvious from the patches are the naming of the files. As this is an instantiated service it should be telnetd.socket and telnetd@.service

Also the ExecStart should probably start with a '-' so information is not kept around for connection-specific failures.

With this the patches works fine on f18 with systemd 195

Yeah, Thomas is right, this is apparently an instantiated service, hence this really needs to be a templated service.

This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.

This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.

(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)

More information and reason for this action is here:
https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19

I tested Jóhann's .socket and .service file, and it works fine with current systemd. I'm attaching an updated version with Documentation= and a minus in ExecStart as per comment #10. Please apply!

Created attachment 740491 [details]
Updated telnet.socket

Created attachment 740492 [details]
Updated telnet@.service

Note the at symbol.

telnet-server-1:0.17-56.fc19.x86_64 has:
/usr/lib/systemd/system/telnet.socket
/usr/lib/systemd/system/telnet@.service