[systemd-devel] Netconsole NG

[poma]

On 07.04.2014 19:55, Zbigniew Jędrzejewski-Szmek wrote:
> On Mon, Apr 07, 2014 at 05:34:10PM +0200, Lukáš Nykrýn wrote:
>> The reason why this was not rewritten a long time ago is that the
>> initscript tries to figure some of those values by itself (for
>> example the MAC address). But yes, we need to do something with
>> netconsole. It is a blocker for my initscripts evil plan.
> Doesn't netconsole figure out most of those settings by itself, and
> others default to sensible values, so if the network card is up
> and has an address configured, only the device and target ip must be given?
> 
>> Dne 6.4.2014 17:59, poma napsal(a):
>>>
>>> /etc/sysconfig/netconsole:
>>> # This is the EnvironmentFile for the netconsole service. Starting this
>>> # service enables the capture of dmesg output on a destination machine.
>>>
>>> # Source port
>>> SRC_PORT=12345
> This should default to empty... Kernel will pick something.
> 
>>>
>>> # Source IP address
>>> SRC_IP=192.168.1.2
> This should default to empty... Kernel will use configured address,
> since we order after network.target anyway.
> 
>>> # Source network device
>>> SRC_DEV=enp1s2
> Maybe this can be made into a instance argument?
> 
>>> # Destination port
>>> DST_PORT=12345
> I think this should default to 514/syslog, and can be left unset.
> 
>>> # Destination IP address
>>> DST_IP=192.168.1.1
>>>
>>> # Destination ethernet address
>>> DST_EHA=00:11:22:33:44:55
> This should default to unset. The kernel will query it if not set.
> 
>>> /usr/lib/systemd/system/netconsole.service:
>>> [Unit]
>>> Description=Adds the netconsole module with the configured parameters
>>> After=network.target
>>>
>>> [Service]
>>> EnvironmentFile=/etc/sysconfig/netconsole
> This is Fedora/RH specific. But I don't know what the proper path should
> be, so maybe this is OK for now.
> 
>>> Type=simple
> This is the default... No need to specify.
> 
>>> RemainAfterExit=yes
>>> ExecStart=/usr/sbin/modprobe netconsole
> This should be /sbin/modprobe for compatibility with split root.
> 
>>> netconsole=${SRC_PORT}@${SRC_IP}/${SRC_DEV},${DST_PORT}@${DST_IP}/${DST_EHA}
>>> ExecStop=/usr/sbin/modprobe -r netconsole
> Ditto.
> 
>>>
>>> [Install]
>>> WantedBy=multi-user.target
> That's a really late... But I don't see a better place unfortunately.
> 
>>> The original SysV netconsole service with related config - still in use,
>>> https://git.fedorahosted.org/cgit/initscripts.git/plain/rc.d/init.d/netconsole
>>> https://git.fedorahosted.org/cgit/initscripts.git/plain/sysconfig/netconsole
>>>
>>> Feel free to comment.
> Looks like an improvement on status quo.
> 
> Zbyszek
> 

Shall we still leave something for users to configure.
Thanks for your review.


poma