Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications. Kubernetes is also referred to as k8s.
- 1 Kubernetes for Arch Linux
- 2 Kubectl plugins for Arch Linux
- 3 Basic configuration
- 4 Trouble shooting
Kubernetes for Arch Linux
There are several AUR packages for Kubernetes on Arch Linux:
- AUR: It builds the go-source code of Kubernetes from the GitHub.
- AUR: It installs the pre-built binaries and configurations of the kubernetes package without requiring to build them.
Kubectl plugins for Arch Linux
Kubectl plugins are independent binaries that can be used to extend the Kubectl's functionalities by providing additional subcommands.
There are AUR packages for Kubectl plugins on Arch Linux:
- AUR: Schedule bpftrace programs on your kubernetes cluster using the kubectl.
You may either choose the
kubeadm helper or manually configuring a kubernetes cluster.
The following guide is for a one-master-one-slave build, where both nodes are in
192.168.122.0/24 network and the master hosts the kubernetes cluster at
192.168.122.1. Note that pods have their own CIDR, assuming
First, setup the configuration file for kubelet service,
KUBELET_ARGS="--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf \ --kubeconfig=/etc/kubernetes/kubelet.conf \ --config=/var/lib/kubelet/config.yaml \ --network-plugin=cni \ --pod-infra-container-image=k8s.gcr.io/pause:3.1"
Don't worry for the not yet existing files in the arguments. They will be created during the
kubeadm initialization process. Note that if you are in a proxy environment or have special DNS settings, you should specify the
resolv.conf to be used in containers by adding one more argument
# kubeadm init --apiserver-advertise-address=192.168.122.1 --pod-network-cidr=192.168.123.0/24
It will show the progress of initialization and stuck later, complaining about something like
[kubelet-check] It seems like the kubelet isn't running or healthy. [kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp 127.0.0.1:10248: connect: connection refused.
At this moment, start
kubelet.service. It is anticipated that kubelet will launch some kubernetes components, which will be confirmed by
kubeadm. If done successfully, there should be a message like:
Your Kubernetes master has initialized successfully!
Then you can configure your account as the administrator of this newly-created kubernetes cluster,
$ mkdir -p $HOME/.kube $ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config $ sudo chown $(id -u):$(id -g) $HOME/.kube/config
Then you can deploy a pod network. Many choices can be found here. Note that all the options have their own default pod network CIDR. Thus, you should modify those settings according to what was given in
Finally, check the health of this master,
$ kubectl get componentstatus
Join the cluster by simply type in the final line of master's successful message,
kubeadm join --token <token> 192.168.122.1:6443 --discovery-token-ca-cert-hash sha256:<hash>
settings behind proxy
kubeadm reads the
no_proxy environment variables. Kubernetes internal networking should be included in the latest one, for example
where the second one is the default service network CIDR.
You may also need extra CNI plugins
$ go get -d github.com/containernetworking/plugins $ cd ~/go/src/github.com/containernetworking/plugins $ bash ./build_linux.sh # cp bin/* /opt/cni/bin/
fatal error: runtime: out of memory
This might happen when building kubernetes from source. A known trick is to setup a
# ￼￼modprobe zram # echo lz4 > /sys/block/zram0/comp_algorithm # echo 16G > /sys/block/zram0/disksize # mkswap --label zram0 /dev/zram0 # swapon --priority 100 /dev/zram0
error when creating "xxx.yaml": No API token found for service account "default"
Please check the details on stackoverflow.
Error: unable to load server certificate
This might happen when start a service. Check if any of the
*.key files' permission setting is not appropriate.