Have been using vijava for one of my projects recently. It’s a fairly decent Java wrapper over Vmware’s web services API. However there are some very basic Java bugs with the library, for example the VirtualEthernetCard class does not override the equals methods (really!!!). This has been causing me a pain while comparing two Sets of VirtualEthernetCard objects. I wish the author had followed the rules mentioned in the awesome book “Effective Java“.
One of the important reasons I love Mac for development work is the amazing iTerm app. Now you can get iTerm like look and feel on Linux by installing the Monaco font and setting it as the default font for the terminal application on Linux.
Was able to get MAAS (Metal AS A Service) working Virsh by following this guide. Following are some of the important points to note about this setup is that Also it’s important to
- The router ip and the upstream DNS need to be set to the MAAS network gateway ip (e.g. 192.168.100.1)
- Set the default gateway field empty.
- In /etc/bind/named.conf.options set dnssec-validation no and remove any_ipv6
After struggling a bit, I finally got RDO packstack working with a RHEL7 qcow2 image. I was able to get it working with three nodes, one controller and two compute nodes. I was able to boot a VM on each of the compute nodes and was able to ping between them. This was achieved via a Vxlan tunnel created between the two nodes.
One important thing about RDO is that I found it quite stable once I could get it working.
I have been trying to get openstack working with packstack on RHEL7 and it has not being an easy. I thought that packstack on RHEL7 would just work but it doesn’t.
Make sure the controller node has at least 4GB of memory.
systemctl disable firewalld systemctl stop NetworkManager.service systemctl disable NetworkManager.service systemctl enable network.service systemctl start network.service
I am using RHEL7 qcow2 image on KVM and one of the annoying problems that bugged me that network.service use to always fail
systemctl start network.service
The reason for this failure was that my ethernet interface was ens3 on the VM but there no corresponding ifcfg file in /etc/sysconfig/network-scripts for it. Once I edit ifcfg-eth0 to ifcfg-ens3, I came over this issue.
Stale mysql database
Every time before you run the packstack command make sure that the mysql database has been cleaned up. This can be done with “rm -rf /var/lib/mysql”
perl -p -i -e "s/_PW=(\S)+/_PW=simple/g" answer.file
I use vim for writing most of my C and Python code. For python I tend to use vim-flake8 for automated PEP8 checking. However I always forget how to install vim-flake8 and hence am writing this post
First install pathogen
mkdir -p ~/.vim/autoload ~/.vim/bundle && \ curl -LSso ~/.vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim
Then install the vim-flake8 plugin
cd ~/.vim/bundle git clone https://github.com/nvie/vim-flake8.git
Finally add the following lines to .vimrc
execute pathogen#infect() filetype off syntax on filetype plugin indent on autocmd BufWritePost *.py call Flake8()
Found an awesome Youtube playlist that explains the concepts of Computer Networking.