Author: Bian Xi

Reset kubernetes master or work

Posted on by Bian Xi Leave a Comment on Reset kubernetes master or work

Reset kubernetes master or work

Reinit

After run init, following error was occurred.

dial tcp 127.0.0.1:10248: connect: connection refused.

Run following command to reinit kubernetes master or worker

sudo mkdir /etc/docker
cat <<EOF | sudo tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF
sudo systemctl enable docker
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo kubeadm reset

Master

sudo kubeadm init

Worker

Join cluster

kubeadm join ...

Label it as worker

kubectl label node kworker1 node-role.kubernetes.io/worker=worker

Install Network Policy Provider

Following messages are printed to create pod network.

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Install Weave Net for NetworkPolicy.

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

References

Kubernetes kubeadm init fails due to dial tcp 127.0.0.1:10248: connect: connection refused
kubernetes cluster master node not ready
Weave Net for NetworkPolicy

Rescan Proxmox Disks

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Rescan Proxmox Disks

There are many reasons that some dangling disk images files exists in Proxmox folder. To remove them from the Proxmox storage, might not be possible, and they might be not shown in VM hardware items as well.

Use rescan command

This is to fix the following issues

  • Disk size change
  • Disk images with no owner
qm rescan

Rename or move old disk

If rescan can not fix the issue, rename the old disk or disk folder, then restart VM to confirm the disk file is not necessary. Then remove disk.

Convert VMware VM to Proxmox VM

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Convert VMware VM to Proxmox VM

Create a new VM in Proxmox

Linux

  • Create new VM in Proxmox, and select correct BIOS.

Windows

  • Create new VM in Proxmox, and select OVMF (UEFI).

Remove newly created disk

  • Detach disk
  • Remove detached disk

Convert disk

Run following command to convert vmdk to qcow2

qm importdisk <VM_ID> <Virtual Disk>.vmdk <storage> --format qcow2

Here, VM_ID is a number. After completed a newly created disk appears in VM

Add disk

Ubuntu

Double click the newly created disk, then select VirtIO Block device.

Select Write Back as cache method

RHEL and Windows

Double click the newly created disk, then select SATA device.

Select Write Back as cache method

Start VM and remove VMware Tools

Ubuntu

apt remove --auto-remove open-vm-tools
apt remove --auto-remove xserver-xorg-video-vmware
apt purge open-vm-tools
apt purge open-vm-tools-desktop

RHEL

yum remove open-vm-tools open-vm-tools-desktop

Reboot the server

Physical RAM Disk

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Physical RAM Disk

Here, talking about physical RAM disk, not the software version.

Interface type

There are three types interface for physical RAM disk, one is PCIe interface, another SATA, or the external drive.

Module

There are two controllers on such board, one is to simulate device, second one is to address the RAM array.

Design

Following web page shows the design of such board

The way we made an external PCIe RAM disk based on the DDR memory Cache

Testing result

Full overview of the new DDR RAM disk

Products

SATA Interface

SATA

PCIe Interface

PCIe

External Drive

External Drive

Shop

pci express ddr3 ram disk

References

If a stick of RAM is given a constant supply of power, could it be used as a permanent storage?