markus_b's questions

I'm attempting to configure a bridge to be used for a KVM host on Ubuntu 2020.4 LTS. The basic configuration with netplan works, but the bridge does not work until I manually add the ethernet interface to the bridge with brctl. But when doing that the connection becomes flaky and eventually stops. How can I have this start up automatically when booting ? What is wrong to make my connectivity go away after adding the interface to the bridge ?

The netplan file:

root@altair:~# cat /etc/netplan/01-ethernet.yaml 
# This is the network config written by 'subiquity'
network:
  version: 2
  ethernets:
    enp2s0:
      dhcp4: false
      dhcp6: false
      # addresses: [192.168.15.28/24]
      # gateway4: 192.168.15.1
      # mtu: 1500
      # nameservers:
      #   addresses: [192.168.15.1]
  bridges:
    br0:
      interfaces: [ enp2s0 ]
      addresses: [192.168.15.28/24]
      gateway4: 192.168.15.1
      mtu: 1500
      nameservers:
        addresses: [192.168.15.1]
      parameters:
        stp: true
        forward-delay: 4
      dhcp4: no
      dhcp6: no

The bridge status is emtpy after boot, using the brctl command I can add the ethernet interface manually:

root@altair:~# brctl show
bridge name bridge id       STP enabled interfaces
br0     8000.000000000000   yes     
root@altair:~# brctl addif br0 enp4s0
root@altair:~# brctl show
bridge name bridge id       STP enabled interfaces
br0     8000.50e5494e2dd1   yes     enp4s0

Also when running the brctl command, after a while my connection hangs and I can only recover it by running ifctl delif br0 enp4s0.

I'm reinstalling cluster nodes with SLES11-SP1. The nodes are boot on SAN and will use the official RDAC driver once installed. But during installation (boot from the network using PXE) there is no multipathing driver present and therefore some activities, like the search for disks and partitions are very slow.

I would like to modify the SuSE-supplied network-install initrd to use dm-multipath during installation. Multipathing with dm-multipaht works and I have a multipath.conf file. I can add those to the initrd just fine. But I'm stuck in how to get the module loaded and the multipathd daemon started automatically during the install process. There is a program called 'init', which is the SuSE installer.

How can I get my 'modprobe dm-multipathd' and 'multipathd' started before handing over control to the install program named 'init' ?

How can I tell syslog-ng that I would like to switch the logfiles.

I'm looking for a command or signal to tell syslog-ng to perform a logswitch. A search of the documentation and FAQ did not come up with a solution.