NixOS TIP: OTP in Gnome login screen
Add to your configuration.nix Then do a And from the user shell
Category: linux
Arch to Manjaro – the dirty way
In my lab I’ve been running arch on a NFS server and the filesystem used is ZFS. I think you already know that in Arch the zfs packages are located in AUR. There are several options like zfs-linux and zfs-dkms. Sadly both are problematic during kernel updates. One solution I…
OpenVPN on 443
SSL VPN? Lately I’ve been working on a project where security is very important. In order to connect to the hosting provider I needed to use a specific VPN provided by FortiNet. What’s interesting about this VPN solution is that apparently it uses HTTPS. this gave me the idea to…
High Availability Load Balancer
Suppose you really need a highly available service. Normally you would put a load balancer in front of a server farm. But what happens when the load balancer fails? Well, we could have to load balancers, one which is actually active and the second one kicking in when first one…
Hosting a Virtual Machine With a Public IP (proxy_arp)
I run this website on a physical server that i rent. Recently I wanted to run on the same server a virtual machine, with a different OS, with a public IP address(I use KVM for that, as there’s nothing to really change on the physical server’s OS and performance-wise it’s…
Removing old kernels
On Debian/Ubuntu we would need to search for installed kernel packages, something like this: root@server:~# dpkg --list |grep linux-image ii linux-image-3.2.0-23-generic 3.2.0-23.36 Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii linux-image-3.2.0-56-generic 3.2.0-56.86 Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii linux-image-3.2.0-57-generic 3.2.0-57.87 …
RHEL (CentOS) – changing Apache’s MPMs
Well, in EL6 when we wanted to change Apache’s MPMs we would edit /etc/sysconfig/httpd and set the HTTPD variable with the binary needed.It looks something like: HTTPD=/usr/sbin/httpd.worker To see the available options we could type the following command: [root@server ~]# ls /usr/sbin/httpd* /usr/sbin/httpd /usr/sbin/httpd.event /usr/sbin/httpd.worker The simple httpd binary uses…
Centos7 – reversing to classic iptables
First of all we need to deactivate FirewallD systemctl disable firewalld.service Then we install the package called iptables-services yum install iptables-services edit /etc/sysconfig/iptables then start classic iptables and make it load on each reboot systemctl start iptables.service systemctl enable iptables
Testing CentOS 7 – Lots have changed
So, just installed the newly launched CentOS 7 and oh boy! Lot’s have changed.Honestly I don’t know if it’s for the good or bad. As I observed the distro moves really fast, and it starts reeeeallly fast! The first notable change is that the default filesystem changed to XFS. Therefore…
Dell tools for Linux servers
When you’re running on Dell hardware and some things just don’t work out as they should you need to know that there are some tools that might save your day. DSET – Dell Server E-Support Tool DSET is a simple reporting tool. You can find it at www.dell.com/dset. Once you…