Lab 11.1 Unable to install linkerd
Hello,
I'm running lab 11.1, but I can't get linkerd installed, as the pods are stuck in CrashLoopBackOff:
The logs of the pods are as follows:
To see the resolv.conf file being configured in the pods I ran a busybox pod, and the resolv.conf file has the following:
I think the "--" at the end might be the problem, but I don't know how to remove it.
I'm running the cluster with VM virtualBox Ubuntu 20.04
Does anyone else have this problem or know how to solve it?
Thank you!
Comments
-
Hi @vramperez,
Can you please provide the contents of
/etc/resolv.conf
from the VirtualBox VM as well?Regards,
-Chris0 -
Hi @chrispokorni,
Thank you for your quick response.
This is my VM's resolv.conf (Ubuntu's 20.04 default):
Thinking that the problem might be the
search --
, I installed the resolvconf package to edit/etc/resolv.conf
in the VM so I could comment out thesearch --
. However, this didn't work because even though the resolv.conf has the linesearch --
commented out, the pods'resolv.conf
still has the--
at the end (I guess it will be added by coreDNS).(The last screenshot is on the master, but the worker has the same config and
/etc/resolv.conf
).Maybe I'm wrong and the problem is not the -- of the resolv.conf...
Thank you.
Br,0 -
Hi @vramperez,
Thank you for the guest VM details. I remember running these labs successfully on VirtualBox VMs, but I provisioned them manually, not with vagrant. Could you double check your Vagrantfile for any possible typos that may be carried over into the VM?
Also, can you check your workstation's
/etc/resolv.conf
?After manually commenting out (or removing) the search line from the VM's
/etc/resolv.conf
, did you re-deploy the pod?Regards,
-Chris0 -
Hi @chrispokorni,
Attached is the Vagrantfile. It is a very standard Vagrantfile. I have tried disabling the vagrant-hosts plugin, but it doesn't solve the problem.
Attached is also the /etc/resolv.conf of my workstation (Ubuntu 20.04).
After commenting out the "search --" line in resolv.conf, I restarted not only the linkerd pods, but also the coreDNS pods, but that didn't work either.
It might be useful to compare the /etc/resolv.conf of my pods, with the one of someone who is working, to see what's different (since it's only a couple of lines).
Thanks!
0 -
Hi @vramperez,
My workstation also runs native Ubuntu 20.04 and in my resolv.conf file there is no "search --" entry. Please consult the official docs on resolv.conf configuration to correct your workstation's file before attempting the labs any further.
Regards,
-Chris0 -
Hi @chrispokorni,
The error seems to be, as I suspected, in the "--" added to the end of the line in resolv.conf. I could only find the double hyphen "--" used to indicate the end of the search suffix list in the resolv.conf file in Ubuntu, Fedora or RHEL (Red Hat Enterprise Linux), but it is not a standard. However, I don't know why it is being added, nor how I could remove it.
However, since this seemed to be the issue, I was able to deploy linkerd by modifying the dnsPoolicy to None and adding the corresponding dnsConfig based on the resolv.conf values of all deployments:
dnsPolicy: None dnsConfig: nameservers: - 10.96.0.10 options: - name: ndots value: "5" searches: - linkerd.svc.cluster.local - svc.cluster.local - cluster.local
With this, all linkerd pods are running and it seems to be working. Tomorrow I hope to do the associated labs, and if I find any problems I'll update this thread.
Thank you!
0
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