Category Archives: DataCenter

Blog Links: SHA-1 cryptographic hash collision detection by Google

By | March 19, 2022

Google puts another nail in the coffin for SHA-1. They already moved from using SHA-1 on their products but there are still a lot of places where is used by default. In a post on the Google Online Security Blog Announcing the first SHA1 collision Google researchers claim that they have a good way of… Read More: Blog Links: SHA-1 cryptographic hash collision detection by Google »

#DRBD: Creating an ext4 over LVM then mount results in detach on RHEL 7 on VMWare

By | March 7, 2017

There is an interesting case of failing technology due to an unimplemented feature. See the following mail list thread for the original post. Basically if you deploy DRBD and one of the endpoints is a vmware virtual machine: – when trying to mount a newly created etx4 file-system over the LVM from the drbd device… Read More: #DRBD: Creating an ext4 over LVM then mount results in… »

Docker in the datacenter with DDC

By | March 3, 2017

Docker starts to look like a competitor to virtualization environments like VMWare VSphere deplyments. In the following knowledge base article Docker Reference Architecture: Docker Datacenter Best Practices and Design Considerations there is a very interesting presentation on how to migrate a datacenter to docker. Docker Datacenter (DDC) is the enterprise container platform from Docker to… Read More: Docker in the datacenter with DDC »

Docker: Orchestrate multiple containers with docker-compose V2

By | February 9, 2017

This is post in continuation of Docker: Orchestrate multiple containers with docker-compose The same application environment is specified using the docker-compose V2 specification. This looks very similar but with a simplified syntax and some extra features. STEP 1: List the existing images # docker images REPOSITORY TAG IMAGE ID CREATED SIZE 10.0.0.245:5000/test_app.v7 flat 53ac9d27fbb3 5… Read More: Docker: Orchestrate multiple containers with docker-compose V2 »

Backup: Scheduled backup with #Yosemite Server Backup

By | May 29, 2017

Everybody knows that backup is important and having a backup setup on an external resource as remote server or tape drive is even better. I wanted to set up an automatic backup that does not require a lot of intervention, to safeguard the most important data hosted on my servers: the owncloud storage space and… Read More: Backup: Scheduled backup with #Yosemite Server Backup »