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.

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&
Read more

Jenkins invalid privatekey

Publish over SSH, Message "invalid privatekey:" With quite recent (June-July 2020) installations of Jenkins and OpenSSH, I have the following error message when using the "Deploy overs SSH" Jenkins plug-in and publishing artifacts to the target overs SSH: jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key. Message [invalid privatekey: [B@d8d395a] This problem seems to be referenced here: https://issues.jenkins-ci.org/browse/JENKINS-57495 Just regenerate a key with the right parameters To solve it: ssh-keygen -t rsa -b 4096 Or ssh-keygen -t rsa -b 4096 -m PEM
Read more

Emacs Pulumi LSP

Install Pulumi Emacs Mode The source code is on https://github.com/pulumi/pulumi-lsp. At the very bottom of the page are the instructions on how to install. You Need to have make installed. $ make install emacs-client mkdir -p ./bin go build -ldflags "-X github.com/pulumi/pulumi-lsp/sdk/version.Version=v0.2.3-6-gec49054" -o ./bin -p 10 ./cmd/... go: downloading github.com/pulumi/pulumi/sdk/v3 v3.53.1 ... ... ... go install -ldflags "-X github.com/pulumi/pulumi-lsp/sdk/version.Version=v0.2.3-6-gec49054" ./cmd/... mkdir -p editors/emacs/bin cd editors/emacs && emacs -Q --batch --eval "(progn (setq package-user-dir \"$(pwd)/bin\" \ package-archives '((\"melpa\" . \"https://melpa.org/packages/\") \
Read more