Troubleshooting Cobbler - Documentation

Resetting the root password¶

Method 1: Update /etc/cobbler/settings.yaml¶

note: Applies to future instances

default_password_crypted: '$5..'

cobbler sync

Method 2: Update using cobbler cli¶

note: Applies to future instances

sudo cobbler-settings modify --key default_password_crypted --value '$5..'

cobbler sync

Method 3: Reset an existing instances root password¶

note: Applies to existing instances.

On cobbler

sudo cobbler system edit \
  --name=rocky9-vm01 \
  --kernel-options="console=tty0 console=ttyS0,115200 rd.break enforcing=0"

sudo cobbler system edit \
  --name=rocky9-vm01 \
  --netboot-enabled=true

sudo cobbler sync

On the hypervisor

sudo virsh destroy rocky9-vm01
sudo virsh start rocky9-vm01
sudo virsh console rocky9-vm01 --devname serial0

Printing out the variables being loaded by a system¶

sudo python3 << 'EOF'
import xmlrpc.client
s = xmlrpc.client.ServerProxy("http://127.0.0.1:25151/")
t = s.login("cobbler", "cobbler")
vars = s.get_blended_data("", "rocky9-vm01")
for k, v in sorted(vars.items()):
    if any(x in k.lower() for x in ['net', 'ip', 'mask', 'gate', 'name', 'intf', 'host', 'interface']):
        print(f"{k}: {v}")
EOF

Check the cobbler instance for PXE traffic¶

sudo tcpdump -i enp1s0 host 192.168.0.51 -n

...
20:07:08.948846 IP 192.168.0.12.bootps > 192.168.0.51.bootpc: BOOTP/DHCP, Reply, length 300
20:07:09.979245 IP 192.168.0.12.bootps > 192.168.0.51.bootpc: BOOTP/DHCP, Reply, length 300
20:07:12.011396 IP 192.168.0.12.bootps > 192.168.0.51.bootpc: BOOTP/DHCP, Reply, length 300
...

## curl: (23) Failure writing output to destination

curl: (23) Failure writing output to destination
dracut: FATAL: Failed to find a root filesystem in /tmp/curl_fetch_url1/install.img
No space left on device

sudo cobbler system edit \
--name=rocky9-vm01 \
--kernel-options="console=tty0 console=ttyS0,115200 inst.repo=https://dl.rockylinux.org/pub/rocky/9/BaseOS/x86_64/os/ inst.stage2=https://dl.rockylinux.org/pub/rocky/9/BaseOS/x86_64/os/ rd.live.ram=0 inst.nompath"

sudo cobbler sync

sudo virsh setmaxmem rocky9-vm01 4194304 --config
sudo virsh setmem rocky9-vm01 4194304 --config
sudo virsh reboot rocky9-vm01

## DNS doesn't work

sudo cobbler sync

## 500 errors

curl -v http://192.168.0.12/cblr/svc/op/autoinstall/system/rocky9-vm01

cat /var/log/httpd/error_log

sudo chmod o+r /etc/cobbler/settings.yaml
sudo systemctl restart httpd
curl -s http://192.168.0.12/cblr/svc/op/autoinstall/system/rocky9-vm01 | head -20
```