I am deploying a Kops Kubernetes cluster on AWS with Debian Jessie image.
Mine is a hybrid environment where my artifactory is in a physical env in our DC. Now I have been facing an issue, my worker nodes are unable to pull images from my artifactory unless I specify the artifactory FQDN and IP in the /etc/hosts file.
So this is a manual edit, it works all fine after I do this. So I went ahead and added the data in my additional userdata of the Kops worker node group, but I am seeing after some time the hosts file on worker nodes is getting overwritten and also this is evident upon node reboot.
So how can I resolve this!!
Another workaround for this is to put it in your /etc/rc.local file:
If the file exists add this to the end:
echo '<ip-address-of-artifactory> <fqdn-of-artifactory>' >> /etc/hostsIf the file doesn't exist, create it:
$ cat << EOF > /etc/rc.local
#!/bin/sh -e
#
echo '<ip-address-of-artifactory> <fqdn-of-artifactory>' >> /etc/hosts
EOF
$ chmod 755 /etc/rc.local
$ reboot # check that it worksThe real answer is to run your own DNS server, or at least use DNS hostnames to resolve. If your router supports it, you can set local hostnames (machine-1.local)
If that isn't possible, you could try a solution like puppet if you own the virtual machines. Also, I believe Kubernetes does have a DNS addon. Also, you could use a crontab for on boot to write to the hosts file, but that's a dirty solution.
In addition, your hosts file would get rewritten for every DHCP renew. You could use static IPs, but again, DNS is the way to go.