To rectify the problem, you need to run the following two commands: I’ve noticed that something disables the bridge-nf-call-iptables kernel parameter, which is required for Kubernetes services to operate properly. # systemctl enable docker & systemctl start docker # systemctl enable kubelet & systemctl start kubeletĮnabling the -nf-call-iptables kernel option Once they’re all installed, you need to manually enable the docker and the kubelet services: Kubernetes Container Networking Interface.
As said, Docker is great to get started to play with containers and microservices.
But let’s keep looking on the bright side of Docker. command line tool for interacting with Kubernetes With the latest Kubernetes announcement to drop Docker Runtime support (NOT Docker Container Support) it is even more clear now, that Docker’s glory days as Runtime of choice are ticking toward an end.tool for deploying multi-node Kubernetes clusters.Kubernetes node agent, which will run everything for you.
#Reset docker and kubernetes environment install
# yum install -y docker kubelet kubeadm kubectl kubernetes-cniĪs you can see, you’re installing quite a few packages. Now you’re ready to install all the packages you need: Installing Docker, Kubelet, kubeadm, kubectl, and Kubernetes-CNI Make sure no whitespace exists after EOF if you’re copying and pasting. It is recommended to run this tutorial on a cluster with at least two nodes that are not acting as control plane hosts. You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.
#Reset docker and kubernetes environment how to
To make the Kubernetes RPM packages available to the yum package manager, you’ll add a kubernetes.repo file to the /etc// directory as shown in the following listing. This page shows how to define environment variables for a container in a Kubernetes Pod. Which means the DOCKERHIDELEGACYCOMMANDS variable would be removed. This may become the default in future releases. Removed symlink /etc/systemd/system//rvice. DOCKERHIDELEGACYCOMMANDS can be set to show only management commands in the Docker help output. # systemctl disable firewalld & systemctl stop firewalld You’ll also disable the firewall, so you don’t run into any firewall-related problems. To disable it permanently, edit the /etc/selinux/config file and change the SELINUX=enforcing line to Deployments run your containers (in whats called a Pod), restart your container when it fails, and let you specify the number of replicas for those Pods (a. To disable SELinux, run the following command:īut this only disables it temporarily (until the next reboot). First, you need to disable two security features: SELinux and the firewall.