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Release 0.26#

2022-05-03

Nokia SR Linux banner#

Little things with big impact - this is what SR Linux banner addition is. Starting with 0.26 release, containerlab will add a banner message to all SR Linux nodes with all necessary pointers such as:

  • docs site
  • release notes PDF
  • YANG browser URL
  • repository where we keep container images
  • links to our cozy discord server and coordinates of ISS our sales representatives
❯ ssh admin@clab-srl-srl
Warning: Permanently added 'clab-srl-srl,2001:172:20:20::f' (ECDSA) to the list of known hosts.
................................................................
:                  Welcome to Nokia SR Linux!                  :
:              Open Network OS for the NetOps era.             :
:                                                              :
:    This is a freely distributed official container image.    :
:                      Use it - Share it                       :
:                                                              :
: Get started: https://learn.srlinux.dev                       :
: Container:   https://go.srlinux.dev/container-image          :
: Docs:        https://doc.srlinux.dev/21-11                   :
: Rel. notes:  https://doc.srlinux.dev/rn21-11-2               :
: YANG:        https://yang.srlinux.dev/v21.11.2               :
: Discord:     https://go.srlinux.dev/discord                  :
: Contact:     https://go.srlinux.dev/contact-sales            :
................................................................

Using configuration file(s): []
Welcome to the srlinux CLI.
Type 'help' (and press <ENTER>) if you need any help using this.
--{ running }--[  ]--

Now everything you need to get started is just one click away.

Topology export#

Our partner in crime @bortok added a nice feature titled "topology data auto export" for his graphite project in #850. What now happens is that on each lab deployment you will find a file called topology-data.json inside the lab directory that contains most important topology information that can be consumed by external tools.

Read more about what data is dumped here.

In addition to the auto-export functionality, users are now able to provide their own Go template file describing the desired output format for topology export. This is possible with the newly added export-template flag.

And even that is not all :D To be able to easily refer to the files located in a lab directory1 a new magic variable has been added - __clabDir__.

Keysight IXIA-C#

Keysight folks added support for their open source traffic generator appliance - ixia-c - to containerlab. Meet keysight_ixia-c-one kind!

This addition allows you to write and run traffic-based tests using open-source production-grade traffic generators all inside the container runtime setting. There is a lot to be said about this integration, and we plan to record a few videos with Keysight; for now you can hack it on your own.

Env files#

Our own @steiler is back and added support (#847) for env files that you can use with env-files node container.

Labels as env vars#

Now every label that you (or containerlab) defined for a node gets promoted to an env var. With this it is possible to let scripts running inside the container access to metadata information we attach via clab files #841.

Sysctls#

And if you wanted to configure sysctls for a node - it is now possible with sysctls container #856.

Bridge forwarding#

When clabbers used linux bridges in their topologies it was common to see traffic to be dropped when entering a bridge. This was in line with the default iptables rules which prevent forwarding over the bridge by default.

Now containerlab will add the relevant iptables rule to allow forwarding over the bridges #871.

Miscellaneous#

  • next-ui-based graph works better with long image names in tooltips #834
  • added json-rpc example for nokia sr linux
  • better runtime mtu detection #840
  • Arista cEOS nodes now will wait for all veth interfaces to first be present inside the container, before starting the main startup scripts #854
  • added PauseContainer runtime method #843
  • containerlab will not attempt to deploy labs with sr linux nodes if SSE3 cpu instruction set is not found #846
  • better cleanup procedure for veth between container and host namespaces #862
  • new community posts

Patches#

0.26.1#

  • scrapligo updated to mitigate long ceos boot times #879
  • better handling of file paths #877
  • support for ceos et interfaces in wait script #881

0.26.2#

  • fix concurrent calls to iptables #884

  1. that is the one that is named as clab-<lab-name>. ↩