Two examples:
- backup and restore GitLab docker container with volumes
- backup and restore only useful data
Category Archives: virtualization
Terraform example for OpenStack and Ansible
This example shows how to automate:
- Creation of two instances sequentially with Terraform on OpenStack cluster.
- Provisioning new instance via Ansible
Terraform does not have Ansible provisioner so we'll use local-exec provisioner for Ansible.
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OpenStack – convert an instance to an image
You cannot create image from a volume in-use. Volume status must be "available" to create image. So:
1. stop instance
2. create snapshoot
3. create new volume from snapshoot
4. convert volume and upload image to the glance
5. download image (optional)
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OpenStack (Newton) enable SSL
This post shows how to switch Horizon to HTTPS.
Before start you should have working OpenStack Horizon through HTTP.
My setup:
OS: CentOS 7.3
OpenStack: Newton
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Kubernetes – simple install on CentOS 7 with Web UI
This posts shows working kubernetes setup on CentOS 7.2.1511. Some steps are not covered in other articles on the internet.
Current Kubernetes release version 1.2.0-0.13 in the CentOS default repositories.
0. Install 2 servers
All your kubernetes nodes will be in 3 different subnets at the same time:
- External interface subnet: 10.0.1.0/24
- Flannel subnet: 172.17.0.0/16 # Do not use existing subnet
- Service cluster subnet: 10.10.10.0/24 # Do not use existing subnet
Each server has 1 Ethernet adapter. Example configuration:
Docker – backup and restore container
Example below shows how to backup on server A and restore docker containers on server B.
As example I'll use container created in the previous post Docker – wordpress all-in-one container on CentOS 7
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Docker containers with MySQL master-slave replication
This post shows process of moving MediaWiki to multiple docker containers setup with MySQL master-slave replication.
I'll skip MediaWiki setup. Focus on docker and MySQL replication.
OpenStack quick install on CentOS 7
This post shows only commands and file modifications without explanation. It is based on http://docs.openstack.org/liberty/install-guide-rdo/
To keep it simple I used the same password for most of services: AdminPass123!
Docker – CentOS 7 container on Ubuntu
Create base image from current CentOS 7 system with one command:
tar --numeric-owner --exclude=/proc --exclude=/sys --exclude=/boot --exclude=/usr/lib/firmware --exclude=/usr/lib/modules --exclude=/usr/lib/udev -cvf centos7.tar /
You will have file size 565M from CentOS 7 minimal install.
More optimal way: https://github.com/docker/docker/blob/master/contrib/mkimage-yum.sh
As result you'll have 247M file.
XEN CentOS as host and guest
Installation and configuration in command line without GUI.
Install
yum install xen virt-manager kernel-xen
chkconfig xend on
reboot
Full virtualization (hardware VMX) should be supported by CPU: Intel®Virtualization Technology (VT) or Pacifica (AMD). Other case paravirtualization only. Check:
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