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Installation

Containerlab is distributed as a Linux deb/rpm package and can be installed on any Debian- or RHEL-like distributive in a matter of a few seconds.

Pre-requisites#

The following requirements must be satisfied to let containerlab tool run successfully:

  • A user should have sudo privileges to run containerlab.
  • A Linux server/VM2 and Docker installed.
  • Load container images (e.g. Nokia SR Linux, Arista cEOS) that are not downloadable from a container registry. Containerlab will try to pull images at runtime if they do not exist locally.

Install script#

Containerlab can be installed using the installation script which detects the operating system type and installs the relevant package:

Note

Containerlab is distributed via deb/rpm packages, thus only Debian- and RHEL-like distributives can leverage package installation.
Other systems can follow the manual installation procedure.

# download and install the latest release (may require sudo)
bash -c "$(curl -sL https://get.containerlab.dev)"

# download a specific version - 0.10.3 (may require sudo)
bash -c "$(curl -sL https://get.containerlab.dev)" -- -v 0.10.3

# with wget
bash -c "$(wget -qO - https://get.containerlab.dev)"

Package managers#

It is possible to install official containerlab releases via public APT/YUM repository.

echo "deb [trusted=yes] https://apt.fury.io/netdevops/ /" | \
sudo tee -a /etc/apt/sources.list.d/netdevops.list

apt update && apt install containerlab

yum-config-manager --add-repo=https://yum.fury.io/netdevops/ && \
echo "gpgcheck=0" | sudo tee -a /etc/yum.repos.d/yum.fury.io_netdevops_.repo

yum install containerlab

Download .apk package from Github releases.

Arch Linux users can download a package from this AUR repository.

Manual package installation

Alternatively, users can manually download the deb/rpm package from the Github releases page.

example: 

# manually install latest release with package managers
LATEST=$(curl -s https://github.com/srl-labs/containerlab/releases/latest | sed -e 's/.*tag\/v\(.*\)\".*/\1/')
# with yum
yum install "https://github.com/srl-labs/containerlab/releases/download/v${LATEST}/containerlab_${LATEST}_linux_amd64.rpm"
# with dpkg
curl -sL -o /tmp/clab.deb "https://github.com/srl-labs/containerlab/releases/download/v${LATEST}/containerlab_${LATEST}_linux_amd64.deb" && dpkg -i /tmp/clab.deb

# install specific release with yum
yum install https://github.com/srl-labs/containerlab/releases/download/v0.7.0/containerlab_0.7.0_linux_386.rpm

The package installer will put the containerlab binary in the /usr/bin directory as well as create the /usr/bin/clab -> /usr/bin/containerlab symlink. The symlink allows the users to save on typing when they use containerlab: clab <command>.

Container#

Containerlab is also available in a container packaging. The latest containerlab release can be pulled with:

docker pull ghcr.io/srl-labs/clab

To pick any of the released versions starting from release 0.19.0, use the version number as a tag, for example, docker pull ghcr.io/srl-labs/clab:0.19.0

Since containerlab itself deploys containers and creates veth pairs, its run instructions are a bit more complex, but still, it is a copy-paste-able command.

For example, if your lab files are contained within the current working directory - $(pwd) - then you can launch containerlab container as follows:

docker run --rm -it --privileged \
    --network host \
    -v /var/run/docker.sock:/var/run/docker.sock \
    -v /var/run/netns:/var/run/netns \
    -v /etc/hosts:/etc/hosts \
    -v /var/lib/docker/containers:/var/lib/docker/containers \
    --pid="host" \
    -v $(pwd):$(pwd) \
    -w $(pwd) \
    ghcr.io/srl-labs/clab bash

Within the started container you can use the same containerlab deploy/destroy/inspect commands to manage your labs.

Note

Containerlab' container command is itself containerlab, so you can deploy a lab without invoking a shell, for example: 

docker run --rm -it --privileged \
# <run options omitted>
-w $(pwd) \
ghcr.io/srl-labs/clab deploy -t somelab.clab.yml

Manual installation#

If the linux distributive can't install deb/rpm packages, containerlab can be installed from the archive:

# get the latest available tag
LATEST=$(curl -s https://github.com/srl-labs/containerlab/releases/latest | \
       sed -e 's/.*tag\/v\(.*\)\".*/\1/')

# download tar.gz archive
curl -L -o /tmp/clab.tar.gz "https://github.com/srl-labs/containerlab/releases/download/v${LATEST}/containerlab_${LATEST}_Linux_amd64.tar.gz"

# create containerlab directory
mkdir -p /etc/containerlab

# extract downloaded archive into the containerlab directory
tar -zxvf /tmp/clab.tar.gz -C /etc/containerlab

# (optional) move containerlab binary somewhere in the $PATH
mv /etc/containerlab/containerlab /usr/bin && chmod a+x /usr/bin/containerlab

Windows Subsystem Linux (WSL)#

Containerlab runs on WSL, but you need to install docker-ce inside the WSL2 linux system instead of using Docker Desktop3.

If you are running Ubuntu 20.04 as your WSL2 machine, you can run this script to install docker-ce.

curl -L https://gist.githubusercontent.com/hellt/e8095c1719a3ea0051165ff282d2b62a/raw/1dffb71d0495bb2be953c489cd06a25656d974a4/docker-install.sh | \
bash

Once installed, issue sudo service docker start to start the docker service inside WSL2 machine.

Running VM-based routers inside WSL

At the moment of this writing, KVM support was not available out-of-the box with WSL2 VMs. There are ways to enable KVM support, but they were not tested with containerlab. This means that running traditional VM based routers via vrnetlab integration is not readily available.

It appears to be that next versions of WSL2 kernels will support KVM.

Mac OS#

Running containerlab on Mac OS is possible4 by means of a separate docker image with containerlab inside.

Warning

ARM-based Macs (M1/2) are not supported, and no binaries are generated for this platform. This is mainly due to the lack of network images built for arm64 architecture as of now.

To use this container use the following command:

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CLAB_WORKDIR=~/clab

docker run --rm -it --privileged \
    --network host \
    -v /var/run/docker.sock:/var/run/docker.sock \
    -v /run/netns:/run/netns \
    --pid="host" \
    -w $CLAB_WORKDIR \
    -v $CLAB_WORKDIR:$CLAB_WORKDIR \
    ghcr.io/srl-labs/clab bash

The first command in the snippet above sets the working directory which you intend to use on your Mac OS. The ~/clab in the example above expands to /Users/<username>/clab and means that we intent to have our containerlab labs to be stored in this directory.

Note

  1. It is best to create a directory under the ~/some/path unless you know what to do5
  2. vrnetlab based nodes will not be able to start, since Docker VM does not support virtualization.
  3. Docker Desktop for Mac introduced cgroups v2 support in 4.3.0 version; to support the images that require cgroups v1 follow these instructions.
  4. Docker Desktop relies on a LinuxKit based HyperKit VM. Unfortunately, it is shipped with a minimalist kernel, and some modules such as VRF are disabled by default. Follow these instructions to rebuild it with more modules.

When the container is started, you will have a bash shell opened with the directory contents mounted from the Mac OS. There you can use containerlab commands right away.

Step by step example

Let's imagine I want to run a lab with two SR Linux containers running directly on a Mac OS.

First, I need to have Docker Desktop for Mac installed and running.

Then I will create a directory under the $HOME path on my mac:

mkdir -p ~/clab

Then I will create a clab file defining my lab in the newly created directory:

cat <<EOF > ~/clab/2srl.clab.yml
name: 2srl

topology:
  nodes:
    srl1:
      kind: srl
      image: ghcr.io/nokia/srlinux
    srl2:
      kind: srl
      image: ghcr.io/nokia/srlinux

  links:
    - endpoints: ["srl1:e1-1", "srl2:e1-1"]
EOF

Now when the clab file is there, launch the container and don't forget to use path to the directory you created:

CLAB_WORKDIR=~/clab

docker run --rm -it --privileged \
    --network host \
    -v /var/run/docker.sock:/var/run/docker.sock \
    -v /run/netns:/run/netns \
    --pid="host" \
    -w $CLAB_WORKDIR \
    -v $CLAB_WORKDIR:$CLAB_WORKDIR \
    ghcr.io/srl-labs/clab bash

Immediately you will get into the directory inside the container with your lab file available:

root@docker-desktop:/Users/romandodin/clab# ls
2srl.clab.yml

Now you can launch the lab, as containerlab is already part of the image: 

root@docker-desktop:/Users/romandodin/clab# clab dep -t 2srl.clab.yml
INFO[0000] Parsing & checking topology file: 2srl.clab.yml 
INFO[0000] Creating lab directory: /Users/romandodin/clab/clab-2srl 
INFO[0000] Creating root CA                             
INFO[0000] Creating docker network: Name='clab', IPv4Subnet='172.20.20.0/24', IPv6Subnet='2001:172:20:20::/64', MTU='1500' 
INFO[0000] Creating container: srl1                     
INFO[0000] Creating container: srl2                     
INFO[0001] Creating virtual wire: srl1:e1-1 <--> srl2:e1-1 
INFO[0001] Adding containerlab host entries to /etc/hosts file 
+---+----------------+--------------+-----------------------+------+-------+---------+----------------+----------------------+
| # |      Name      | Container ID |         Image         | Kind | Group |  State  |  IPv4 Address  |     IPv6 Address     |
+---+----------------+--------------+-----------------------+------+-------+---------+----------------+----------------------+
| 1 | clab-2srl-srl1 | 574bf836fb40 | ghcr.io/nokia/srlinux | srl  |       | running | 172.20.20.2/24 | 2001:172:20:20::2/64 |
| 2 | clab-2srl-srl2 | f88531a74ffb | ghcr.io/nokia/srlinux | srl  |       | running | 172.20.20.3/24 | 2001:172:20:20::3/64 |
+---+----------------+--------------+-----------------------+------+-------+---------+----------------+----------------------+

Upgrade#

To upgrade containerlab to the latest available version issue the following command1:

containerlab version upgrade

This command will fetch the installation script and will upgrade the tool to its most recent version.

or leverage apt/yum utilities if containerlab repo was added as explained in the Package managers section.

From source#

To build containerlab from source:

To build containerlab from source, clone the repository and issue go build at its root.

When we release containerlab we use goreleaser project to build binaries for all supported platforms as well as the deb/rpm packages.
Users can install goreleaser and do the same locally by issuing the following command: 

goreleaser --snapshot --skip-publish --rm-dist

Uninstall#

To uninstall containerlab when it was installed via installation script or packages:

apt remove containerlab

yum remove containerlab

Containerlab binary is located at /usr/bin/containerlab. In addition to the binary, containerlab directory with static files may be found at /etc/containerlab.

SELinux#

When SELinux set to enforced mode containerlab binary might fail to execute with Segmentation fault (core dumped) error. This might be because containerlab binary is compressed with upx and selinux prevents it from being decompressed by default.

To fix this:

sudo semanage fcontext -a -t textrel_shlib_t $(which containerlab)
sudo restorecon $(which containerlab)

or more globally:

sudo setsebool -P selinuxuser_execmod 1

  1. only available if installed from packages ↩

  2. Most containerized NOS will require >1 vCPU. RAM size depends on the lab size. Architecture: AMD64. ↩

  3. No need to uninstall Docker Desktop, just make sure that it is not integrated with WSL2 machine that you intend to use with containerlab. Moreover, you can make it even work with Docker Desktop with a few additional steps, but installing docker-ce into the WSL maybe more intuitive. ↩

  4. kudos to Michael Kashin who shared this approach with us ↩

  5. otherwise make sure to add a custom shared directory to the docker on mac. ↩