AWX is the upstream project from which the Red Hat Ansible Tower offering is ultimately derived.
Read more: AWX project FAQ
Install steps below on CentOS 7.3 minimal.
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Install AWX on CentOS 7
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Rocks 6.2 – Could not find kernel image
This issue happens on some hardware nodes. After successful compute node install. First boot is hanging with message:
TFTP prefix:
trying to load : pxelinux.cfg/0101FFFF OK
booting from local disk
PXE-M0F: Exiting Intel boot agent
Could not find kernel image:
boot:
Gitlab docker container – backup and restore
Two examples:
- backup and restore GitLab docker container with volumes
- backup and restore only useful data
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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Consul – create rpm package
RPM package is convenient way to automate consul installation on many RHEL or CentOS servers. But consul rpm is not provided by HashiCorp.
Let's create consul RPM package for CentOS 7 with systemd support.
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OpenStack (Newton) – issues after install
I followed this documentation: https://docs.openstack.org/newton/install-guide-rdo/
Below are mix of issue and how to fix them after install OpenStack (Newton) cluster on Centos 7.
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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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SLURM HPC status page – release December 2016
Whats new:
- system info and historical data are stored in sqlite3 database
- moved to Charts.js 2.4.0
- Added charts for 1 day, 1 month, 1 year
Python – yield – simple explanation
Meaning of this post is to create first simple understanding of the yield. Yield is one of the topics that maybe hard to understand in the Python.
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Kubernetes – troubleshooting and commands
This post is related to the previous one: Kubernetes – simple install on CentOS 7 with Web UI
- How to reset kubernetes configuration and setup
- Change service IP subnet
- Useful commands
- Logs
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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:
