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Configuring the Kubernetes Deployment Environment

  • The SELinux security mechanism enabled by default on Linux prevents some ports on the container network from being enabled. As a result, services for virtualization scenarios cannot be deployed. This is the behavior of Linux itself, and Kunpeng BoostKit for Virtualization does not provide a solution to this issue. If you want to use SELinux in your own system, please find a solution by yourself.
  • We provide a method for quickly disabling SELinux. The SELinux configuration method provided in Kunpeng BoostKit for Virtualization is for reference only. You need to evaluate the method and bear related risks.
  • Disabling SELinux may cause security issues. If you do not plan to enable SELinux, it is recommended that an end-to-end solution be used to eliminate the risks caused by disabling SELinux. You shall bear the security risks by yourself. If you need to enable SELinux, configure fine-grained security rules based on actual SELinux issues to ensure system security.

Configure the Kubernetes deployment environment on the management and compute nodes.

Procedure

  1. Disable the firewall.
    systemctl stop firewalld && systemctl disable firewalld
  2. Disable SELinux.
    setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
  3. Disable the swap partition.
    1. Disable the swap partition temporarily.
      swapoff -a
    2. Comment out swap in /etc/fstab.
      vi /etc/fstab
#/dev/mapper/centos-swap     swap      swap     defaults     0     0
  4. Check whether the swap partition is disabled.
    cat /proc/swaps

    If the following information is displayed, the swap partition is disabled:

  5. Load the kernel module.
    cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
  6. Set and apply the sysctl parameters. These parameters are still valid after the OS is restarted.
    • If the OS is CentOS 8.1, run the following commands:
      cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
sudo sysctl --system

    • If the OS is openEuler 20.03, run the following commands:
      cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
cat <<EOF | sudo tee /etc/sysctl.conf
net.ipv4.ip_forward                 = 1
EOF
sudo sysctl -p /etc/sysctl.d/99-kubernetes-cri.conf
sudo sysctl -p /etc/sysctl.conf

  7. Enable iptables to check bridged traffic.
    cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system