[systemd-devel] We are working on Secure Container Applications.

["Jóhann B. Guðmundsson"]

On 01/10/2012 11:51 PM, Lennart Poettering wrote:
> Yes. Most likely you don't even have to create the file
> /etc/systemd/system/httpd at sanbox2.service at all, instead just symlink
> it from /lib/systemd/system/httpd at .service, i.e. the common template.

Dan to give you an example which I used test to run multiple instances 
of vsftpd of an template unit a while back with quick and dirty 
directions I had noted down while doing it...

First here is a httpd template unit file for you to start fiddling with 
and tailor to your needs since this is rather lengthy post but should 
give you the general idea of what needs to be done and what Lennart is 
referring to....

### Sample httpd at .service template ###

[Unit]
Description=The Apache HTTP Server Instance %i
After=network.target

[Service]
Type=forking
PIDFile=/run/httpd/%i.pid
ExecStart=/usr/sbin/httpd -f /etc/httpd/conf.d/%i.conf -k start
ExecReload=/usr/sbin/httpd -t
ExecReload=/bin/kill -HUP $MAINPID
ExecStop=/usr/sbin/httpd -k stop

[Install]
WantedBy=multi-user.target

The VSFTPD template unit.

### vsftpd at .service ###

[Unit]
Description=Vsftpd FTP Daemon Server Instance %i
After=network.target

[Service]
Type=forking
ExecStart=/usr/sbin/vsftpd /etc/vsftpd/%i.conf

[Install]
WantedBy=multi-user.target

Next create a multiple copy's of the vsftpd.conf file

for i in 1 2 3 4;do cp /etc/vsftpd/vsftpd.conf 
/etc/vsftpd/vsftpd$i.conf; done

Set different log file for each of them...

for i in 1 2 3 4;do echo "xferlog_file=/var/log/vsftpd$i.log" >> 
/etc/vsftpd/vsftpd$i.conf; done

Set different listening port in each configuration file on them...

for i in 1 2 3 4;do echo "listen_port=200$i" >> 
/etc/vsftpd/vsftpd$i.conf; done

Then symbolic link that template to the name of the each configuration file

ln -s /lib/systemd/system/vsftpd\@.service 
/etc/systemd/system/vsftpd\@vsftpd1.service
ln -s /lib/systemd/system/vsftpd\@.service 
/etc/systemd/system/vsftpd\@vsftpd2.service
ln -s /lib/systemd/system/vsftpd\@.service 
/etc/systemd/system/vsftpd\@vsftpd3.service
ln -s /lib/systemd/system/vsftpd\@.service 
/etc/systemd/system/vsftpd\@vsftpd4.service

Reload the systemd daemon

systemctl daemon-reload

Start each instance

systemctl start vsftpd at vsftpd1.service vsftpd at vsftpd2.service 
vsftpd at vsftpd3.service vsftpd at vsftpd4.service

Check to see if each instance is running and listening on different 
ports...

[root at localhost system]# systemctl status vsftpd at vsftpd1.service 
vsftpd at vsftpd2.service vsftpd at vsftpd3.service vsftpd at vsftpd4.service
vsftpd at vsftpd1.service - Vsftpd FTP Daemon Server Instance vsftpd1
Loaded: loaded (/lib/systemd/system/vsftpd at .service; enabled)
Active: active (running) since Wed, 11 Jan 2012 01:22:46 +0000; 2s ago
Process: 7351 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/%i.conf 
(code=exited, status=0/SUCCESS)
Main PID: 7358 (vsftpd)
CGroup: name=systemd:/system/vsftpd at .service/vsftpd1
└ 7358 /usr/sbin/vsftpd /etc/vsftpd/vsftpd1.conf

vsftpd at vsftpd2.service - Vsftpd FTP Daemon Server Instance vsftpd2
Loaded: loaded (/lib/systemd/system/vsftpd at .service; enabled)
Active: active (running) since Wed, 11 Jan 2012 01:22:46 +0000; 2s ago
Process: 7352 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/%i.conf 
(code=exited, status=0/SUCCESS)
Main PID: 7357 (vsftpd)
CGroup: name=systemd:/system/vsftpd at .service/vsftpd2
└ 7357 /usr/sbin/vsftpd /etc/vsftpd/vsftpd2.conf

vsftpd at vsftpd3.service - Vsftpd FTP Daemon Server Instance vsftpd3
Loaded: loaded (/lib/systemd/system/vsftpd at .service; enabled)
Active: active (running) since Wed, 11 Jan 2012 01:22:46 +0000; 2s ago
Process: 7353 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/%i.conf 
(code=exited, status=0/SUCCESS)
Main PID: 7355 (vsftpd)
CGroup: name=systemd:/system/vsftpd at .service/vsftpd3
└ 7355 /usr/sbin/vsftpd /etc/vsftpd/vsftpd3.conf

vsftpd at vsftpd4.service - Vsftpd FTP Daemon Server Instance vsftpd4
Loaded: loaded (/lib/systemd/system/vsftpd at .service; enabled)
Active: active (running) since Wed, 11 Jan 2012 01:22:46 +0000; 2s ago
Process: 7354 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/%i.conf 
(code=exited, status=0/SUCCESS)
Main PID: 7356 (vsftpd)
CGroup: name=systemd:/system/vsftpd at .service/vsftpd4
└ 7356 /usr/sbin/vsftpd /etc/vsftpd/vsftpd4.conf

[root at localhost system]# netstat -pant | grep vsftpd
tcp 0 0 :::2001 :::* LISTEN 7358/vsftpd
tcp 0 0 :::2002 :::* LISTEN 7357/vsftpd
tcp 0 0 :::2003 :::* LISTEN 7355/vsftpd
tcp 0 0 :::2004 :::* LISTEN 7356/vsftpd