Deploying Kubernetes from scratch

Could someone share some good tutorials how to deploy kubernetes cluster on my own server. I do not wana use amazon,bigital ocean or linode. I have my proxmox server. So the ideal scenario will be 1 master and 3 slave nodes 4-th if its necessary. Ive watch some tutorials but still i would like to … Read more

How to route ping packet from A to C?

I’m beginning understanding network concepts and tools. I setup three VM’s with the following configuration: A: B: C: In A, I ping and it pongs. I think A has no idea where is located. So, when I ping, it doesn’t know to what interface it should be routed. … Read more

Bind DNS configuration is not showing A record for domain

I’m new to DNS setup and followed several instructions on setting up Bind DNS. Below is my zone file: ; $TTL 604800 @ IN SOA sandbox.svr. root.viper.sandbox.svr. ( 13 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; ; Name servers @ IN NS sandbox.svr. @ … Read more

how to filter dns requests with iptables

I am trying to filter the dns requests from my local network. Only authorize requests to specific dns and deny the rest, but it has not worked for me. This is my rule (with dns google example): internal=enp2s1 external=enp2s0 iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT echo 1 > /proc/sys/net/ipv4/ip_forward … Read more

Fail2Ban is not updating iptables rules

I have set up fail2ban to protect my ssh port using these rather old instructions: I tested my set-up by botching a bunch of log-ins from another computer and fail2ban does manage to block the IP. I even confirmed as shown here: $ sudo fail2ban-client status sshd Status for the jail: sshd |- Filter … Read more

bind9 not resolving intranetlinks

As a follow up to a question I’ve asked earlier: Linux server migration to Windows workstation. A supplier got us a new network-card yesterday, but no harddrives so far. I’ve also bit the bullet on reconfiguring the server as there was too much behavior on the old machine I couldn’t explain/fix and the previous developers … Read more

Why does mailutils no longer contain Postfix on Ubuntu 20.04?

I am trying to install postfix on ubuntu 20.04 but the postfix config screen does not start and there is no error message: user@leo:~$ sudo apt-get install mailutils Reading package lists… Done Building dependency tree Reading state information… Done mailutils is already the newest version (1:3.7-2.1). 0 upgraded, 0 newly installed, 0 to remove and … Read more

How to add user to postfix? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 months ago. Improve this question I created and configured postfix with davecot, everything seems to work: Dec 20 10:31:32 mailer … Read more

Ports closed remotely while they are open locally [closed]

Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Server Fault. Closed 8 months ago. Improve this question i have a problem with a mariaDB server, the port is locally open, but on a remote desktop, the port appears closed. Port … Read more

Deploy Rails app to Ubuntu 18.04 or 20.04?

I have an existing Rails app that’s been sitting on an old Ubuntu 14.04 server on AWS, and I’ve recently moved the staging environment over to a new AWS EC2 instance running Ubuntu 18.04. I’m not a Ubuntu expert by any means – hence this question – but with the very recent release of 20.04 … Read more