Skip to main content

ssh fingerprint authenticity prompt

The authenticity of host can't be established

I faced a weird problem today:

  • A Jenkins post-build job is configured to deploy via scp to a target server
  • Jenkins runs as "integration" user
  • As "integration"  user, I already made sure the server is in "known_hosts", by manually SSH connected to it (when SSH-ing to it, I'm not prompted about the target server's identity anymore)
  • The Jenkins job is still prompted about the target server's identity
What was really weird:
  • From the Jenkins job, the target server's fingerprint is RSA based and is d9:fa:90:e6:2b:d2:f7:92:8b:28:3f:94:1e:bf:1b:fa.
  • From an SSH session, the target server's fingerprint is ECDSA based and is 0d:2a:c3:3b:8f:f1:e9:bc:1f:5d:68:d3:84:6d:71:a8.

This is because

  • The Jenkins SSH plugin I use is not up to date and still use weak and old fashioned algorithms: the negiciation stops at a weak one, DSA.
  • The SSH client (in SSH session) negociation ends up a stronger algorithm, ECDSA.

This is proven by these commands.

To force RSA algorithm:
ssh -o,\

The prompt is:

The authenticity of host ' (' can't be established.
RSA key fingerprint is d9:fa:90:e6:2b:d2:f7:92:8b:28:3f:94:1e:bf:1b:fa.

To let the negociation go on and end up with ECDSA:


The prompt is:

The authenticity of host ' (' can't be established.
ECDSA key fingerprint is 0d:2a:c3:3b:8f:f1:e9:bc:1f:5d:68:d3:84:6d:71:a8.

So, in order to add the target host to the "known_hosts", I had to use the command forcing RSA to be used:

ssh -o,\

And then issue the "yes" confirmation.

This way the Jenkins job can smoothly SSH-connect to the target host in order to deploy.

Thanks to and


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=''

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=''" parameter.

npm run build --base-href='

did not set the base href in indext.html

After looking for a while, I found 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=''

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= " >> /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…