Category: Computer

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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

Posted on by Bian Xi Leave a Comment on Rescan Proxmox Disks

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.

Migrate TrueNAS VM to Proxmox VM

Posted on by Bian Xi Leave a Comment on Migrate TrueNAS VM to Proxmox VM

Migrate TrueNAS VM to Proxmox VM

After Proxmox installed, I also migrate TrueNAS VM to Proxmox as VM for both Ubuntu VM and Windows 10 VM.

Copy zvol to a file and transfer to Proxmox server

The zpool volume device is located in /dev/zvol/<zpool_name>/<zvol_name>. Create disk image using following command.

dd if=/dev/zvol/pool0/server-xxxxxx of=/tmp/server.raw bs=8m
scp ...

Another way to transfer

dd if=/dev/zvol/.... bs=8192 status=progress | ssh root@proxmox 'dd of=....raw bs=8192'

or

dd if=/dev/zvol/.... bs=8192 status=progress | gzip -1 - | ssh root@proxmox 'dd of=....raw.gz bs=8192'

or

dd if=/dev/zvol/.... bs=8192 status=progress | gzip -1 - | ssh root@proxmox 'gunzip - | dd of=....raw.gz bs=8192'

Transfer raw file into Proxmox server

Create Proxmox VM

  • Create a VM with OVMF (UEFI) if TrueNAS VM is using UEFI

  • Remove VM disk

  • Use following command to import disk

qm importdisk <vm_id> <raw_file> <storage_id>

For example

qm importdisk 100 vm.raw ds1812-vm_nfs1

  • Go to VM hardware page

  • Select unused disk and click Add button to add disk into VM

    • For Linux, select SCSI as controller
    • For Windows, select SATA

  • Select Options => Boot Order to check the iscsi/sata controller

Boot TrueNAS VM

References

Export Virtual Machine from TrueNAS and Import VM to Proxmox
Migration of servers to Proxmox VE
Additional ways to migrate to Proxmox VE

Physical RAM Disk

Posted on by Bian Xi Leave a Comment on Physical RAM Disk

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?

WordPress ERROR: Please solve Captcha correctly!

Posted on by Bian Xi Leave a Comment on WordPress ERROR: Please solve Captcha correctly!

WordPress ERROR: Please solve Captcha correctly!

Recently, I got such error quite often when using google reCaptcha v3. To allow me login without reCaptcha verification, login to WordPress server, and rename plugin folder advanced-nocaptcha-recaptcha, then login normally. After login, rename back the folder.

References

Advanced noCaptcha & invisible Captcha (v2 & v3)

Replace audio in a video file

Posted on by Bian Xi Leave a Comment on Replace audio in a video file

Replace audio in a video file

When downloaded video file, there could be a reason requires replace audio due to different language, etc.

Extract audio from a video file

For example, extract audio from with_audio.mp4 and save audio as file output-audio.acc

ffmpeg -i with_audio.mp4 -map 0:a:0 -c copy output-audio.aac
ffmpeg -i with_audio.mp4 -vn -acodec copy output-audio.aac

Merge video and audio into one file

Following command give two inputs, first one is video file (index 0), second one is audio file (index 1). The first -map means getting first input (index 0) as video in first output (out_index 0), and the second -map means getting second input (index 1) as audio in first output (out_index 0).

ffmpeg -i without_audio.mp4 -i output-audio.aac -c:v copy -map 0:v:0 -map 1:a:0 new.mp4