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Update README with additional disk preparation commands for Ceph

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Marco van Zijl 2025-05-04 11:49:07 +02:00
parent 8997398b81
commit 6dce849f97
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readme.md
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@ -189,11 +189,26 @@ kubectl run -it --rm \
--overrides='{"spec": { "nodeSelector": {"kubernetes.io/hostname": "master3"}}}' fix
```
Then run the following commands:
Search for the correct disk with `blkid`, set `DISK=/dev/sdX`, then run (some of) the following commands:
```bash
ceph-volume lvm zap /dev/sdX --destroy
wipefs -a /dev/sdX
# Zap the disk to a fresh, usable state (zap-all is important, b/c MBR has to be clean)
sgdisk --zap-all $DISK
# Wipe portions of the disk to remove more LVM metadata that may be present
dd if=/dev/zero of="$DISK" bs=1K count=200 oflag=direct,dsync seek=0 # Clear at offset 0
dd if=/dev/zero of="$DISK" bs=1K count=200 oflag=direct,dsync seek=$((1 * 1024**2)) # Clear at offset 1GB
dd if=/dev/zero of="$DISK" bs=1K count=200 oflag=direct,dsync seek=$((10 * 1024**2)) # Clear at offset 10GB
dd if=/dev/zero of="$DISK" bs=1K count=200 oflag=direct,dsync seek=$((100 * 1024**2)) # Clear at offset 100GB
dd if=/dev/zero of="$DISK" bs=1K count=200 oflag=direct,dsync seek=$((1000 * 1024**2)) # Clear at offset 1000GB
# SSDs may be better cleaned with blkdiscard instead of dd
blkdiscard $DISK
# Inform the OS of partition table changes
partprobe $DISK
```
### Certificate lifetimes