Skip to main content

Settting up network in KVM

When installing a KVM VM in Ubuntu, one of the question is: How to configure its network.
There is basically two choices:
  • A virtual bridge that will NAT the VMs connected to it.
  • A physical bridge so that all VMs will be able to have a "public" IP address

NATing virtual bridge (default, virbr0)

This is the default bridge if you follow the Ubuntu Official tutorial.
This bridge will act as a DHCP server + a gateway. VMs will be able to reach internet but their source IP address will be seen as the virbr0 IP.

Non-NATing bridge

Most of my time, I want to use VMs as public servers. Having them NATed as described above is quite uselss for that purpose.
Libvirt allows to do that, assuming you have
The steps:
  • Create a bridge containing only the physical existing interface
  • Each created VM will then join that bridge
Creating a VM that way is described on a precedent blog post.

Comments

Popular posts from this blog

npm run build base-href

Using NPM to specify base-href
When building an Angular application, people usually use "ng" and pass arguments to that invocation.
Typically, when wanting to hard code "base-href" in "index.html", one will issue:

ng build --base-href='https://ngx.rktmb.org/foo'


I used to build my angular apps through Bamboo or Jenkins and they have a "npm" plugin.
I got the habit to build the application with "npm run build" before deploying it.

But the development team once asked me to set the "--base-href='https://ngx.rktmb.org/foo'" parameter.

npm run build --base-href='https://ngx.rktmb.org/foo


did not set the base href in indext.html

After looking for a while, I found https://github.com/angular/angular-cli/issues/13560 where it says:
You need to use −− to pass arguments to npm scripts. This did the job!
The command to issue is then:

npm run build -- --base-href='https://ngx.rktmb.org/foo'

dockerfile multiline to file

Outputing a multiline string from Dockerfile
I motsly use a Dockerfile by sourcing from a base ditribution: CentOS or Debian.
But I also have a local mirror and would like to use it for packages installation.

Espacially on CentOS it is about many lines to write to the /etc/yum.repos.d/CentOS-Base.repo file.

Easiest way: one RUN per line The first method that comes in mind is to issue one RUN per line to write.
Here you are:

RUN echo "[base] " > /etc/yum.repos.d/CentOS-Base.repo RUN echo "name=CentOS-$releasever - Base " >> /etc/yum.repos.d/CentOS-Base.repo RUN echo "baseurl=ftp://packages-infra.mg.rktmb.org/pub/centos/7/base-reposync-7 " >> /etc/yum.repos.d/CentOS-Base.repo RUN echo "gpgcheck=0 " >>…

Jira workflow for new projects

Associated workflow creation I'm a Jira Cloud user and begining from some version 6, I noticed that when I create a project, it automatically creates a Workflow and Issue Scheme that is prepended by the project key and which is a copy of the default scheme.
I always had to make a cleanup after creating a project. Default workflow for new projects I also miss a feature that would allow me to make a custom workflow (and globally custom project setting) the default for new projects I create.
Solution: Create with shared configuration While searching, I noticed that with Jira Cloud which is version 7.1.0 at the time I write, there is a link at the bottom of the "Create project" wizard:
"Create with shared configuration" will allow me to select the project I want the new one to share configuration with.

The new created project will use the same configuration as the project I selectThere will be no creation of Workflow and Issue Scheme that I need to cleanup

This fea…